2008-06-20 01:26:19 +07:00
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#ifndef _SPARC64_TTABLE_H
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#define _SPARC64_TTABLE_H
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#include <asm/utrap.h>
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2008-11-24 12:55:29 +07:00
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#include <asm/pil.h>
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2008-06-20 01:26:19 +07:00
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#ifdef __ASSEMBLY__
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#include <asm/thread_info.h>
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#endif
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#define BOOT_KERNEL b sparc64_boot; nop; nop; nop; nop; nop; nop; nop;
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/* We need a "cleaned" instruction... */
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#define CLEAN_WINDOW \
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rdpr %cleanwin, %l0; add %l0, 1, %l0; \
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wrpr %l0, 0x0, %cleanwin; \
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clr %o0; clr %o1; clr %o2; clr %o3; \
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clr %o4; clr %o5; clr %o6; clr %o7; \
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clr %l0; clr %l1; clr %l2; clr %l3; \
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clr %l4; clr %l5; clr %l6; clr %l7; \
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retry; \
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nop;nop;nop;nop;nop;nop;nop;nop;nop;nop;nop;nop;
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#define TRAP(routine) \
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sethi %hi(109f), %g7; \
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ba,pt %xcc, etrap; \
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109: or %g7, %lo(109b), %g7; \
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call routine; \
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add %sp, PTREGS_OFF, %o0; \
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ba,pt %xcc, rtrap; \
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nop; \
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nop;
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#define TRAP_7INSNS(routine) \
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sethi %hi(109f), %g7; \
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ba,pt %xcc, etrap; \
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109: or %g7, %lo(109b), %g7; \
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call routine; \
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add %sp, PTREGS_OFF, %o0; \
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ba,pt %xcc, rtrap; \
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nop;
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#define TRAP_SAVEFPU(routine) \
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sethi %hi(109f), %g7; \
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ba,pt %xcc, do_fptrap; \
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109: or %g7, %lo(109b), %g7; \
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call routine; \
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add %sp, PTREGS_OFF, %o0; \
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ba,pt %xcc, rtrap; \
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nop; \
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nop;
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#define TRAP_NOSAVE(routine) \
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ba,pt %xcc, routine; \
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nop; \
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nop; nop; nop; nop; nop; nop;
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#define TRAP_NOSAVE_7INSNS(routine) \
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ba,pt %xcc, routine; \
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nop; \
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nop; nop; nop; nop; nop;
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#define TRAPTL1(routine) \
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sethi %hi(109f), %g7; \
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ba,pt %xcc, etraptl1; \
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109: or %g7, %lo(109b), %g7; \
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call routine; \
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add %sp, PTREGS_OFF, %o0; \
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ba,pt %xcc, rtrap; \
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nop; \
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nop;
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#define TRAP_ARG(routine, arg) \
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sethi %hi(109f), %g7; \
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ba,pt %xcc, etrap; \
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109: or %g7, %lo(109b), %g7; \
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add %sp, PTREGS_OFF, %o0; \
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call routine; \
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mov arg, %o1; \
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ba,pt %xcc, rtrap; \
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nop;
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#define TRAPTL1_ARG(routine, arg) \
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sethi %hi(109f), %g7; \
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ba,pt %xcc, etraptl1; \
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109: or %g7, %lo(109b), %g7; \
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add %sp, PTREGS_OFF, %o0; \
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call routine; \
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mov arg, %o1; \
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ba,pt %xcc, rtrap; \
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nop;
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#define SYSCALL_TRAP(routine, systbl) \
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rdpr %pil, %g2; \
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mov TSTATE_SYSCALL, %g3; \
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sethi %hi(109f), %g7; \
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ba,pt %xcc, etrap_syscall; \
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109: or %g7, %lo(109b), %g7; \
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sethi %hi(systbl), %l7; \
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ba,pt %xcc, routine; \
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or %l7, %lo(systbl), %l7;
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#define TRAP_UTRAP(handler,lvl) \
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mov handler, %g3; \
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ba,pt %xcc, utrap_trap; \
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mov lvl, %g4; \
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nop; \
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nop; \
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nop; \
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nop; \
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nop;
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#ifdef CONFIG_COMPAT
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#define LINUX_32BIT_SYSCALL_TRAP SYSCALL_TRAP(linux_sparc_syscall32, sys_call_table32)
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#else
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#define LINUX_32BIT_SYSCALL_TRAP BTRAP(0x110)
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#endif
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#define LINUX_64BIT_SYSCALL_TRAP SYSCALL_TRAP(linux_sparc_syscall, sys_call_table64)
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#define GETCC_TRAP TRAP(getcc)
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#define SETCC_TRAP TRAP(setcc)
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#define BREAKPOINT_TRAP TRAP(breakpoint_trap)
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#ifdef CONFIG_TRACE_IRQFLAGS
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#define TRAP_IRQ(routine, level) \
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rdpr %pil, %g2; \
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2008-11-24 12:55:29 +07:00
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wrpr %g0, PIL_NORMAL_MAX, %pil; \
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2008-06-20 01:26:19 +07:00
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sethi %hi(1f-4), %g7; \
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ba,pt %xcc, etrap_irq; \
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or %g7, %lo(1f-4), %g7; \
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nop; \
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nop; \
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nop; \
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.subsection 2; \
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1: call trace_hardirqs_off; \
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nop; \
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mov level, %o0; \
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call routine; \
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add %sp, PTREGS_OFF, %o1; \
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ba,a,pt %xcc, rtrap_irq; \
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.previous;
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#else
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#define TRAP_IRQ(routine, level) \
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rdpr %pil, %g2; \
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2008-11-24 12:55:29 +07:00
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wrpr %g0, PIL_NORMAL_MAX, %pil; \
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2008-06-20 01:26:19 +07:00
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ba,pt %xcc, etrap_irq; \
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rd %pc, %g7; \
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mov level, %o0; \
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call routine; \
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add %sp, PTREGS_OFF, %o1; \
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ba,a,pt %xcc, rtrap_irq;
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#endif
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2008-11-24 12:55:29 +07:00
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#define TRAP_NMI_IRQ(routine, level) \
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rdpr %pil, %g2; \
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wrpr %g0, PIL_NMI, %pil; \
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ba,pt %xcc, etrap_irq; \
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rd %pc, %g7; \
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mov level, %o0; \
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call routine; \
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add %sp, PTREGS_OFF, %o1; \
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2008-11-26 13:24:59 +07:00
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ba,a,pt %xcc, rtrap_nmi;
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2008-11-24 12:55:29 +07:00
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2008-06-20 01:26:19 +07:00
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#define TRAP_IVEC TRAP_NOSAVE(do_ivec)
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#define BTRAP(lvl) TRAP_ARG(bad_trap, lvl)
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#define BTRAPTL1(lvl) TRAPTL1_ARG(bad_trap_tl1, lvl)
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#define FLUSH_WINDOW_TRAP \
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ba,pt %xcc, etrap; \
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rd %pc, %g7; \
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flushw; \
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ldx [%sp + PTREGS_OFF + PT_V9_TNPC], %l1; \
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add %l1, 4, %l2; \
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stx %l1, [%sp + PTREGS_OFF + PT_V9_TPC]; \
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ba,pt %xcc, rtrap; \
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stx %l2, [%sp + PTREGS_OFF + PT_V9_TNPC];
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#ifdef CONFIG_KPROBES
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#define KPROBES_TRAP(lvl) TRAP_IRQ(kprobe_trap, lvl)
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#else
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#define KPROBES_TRAP(lvl) TRAP_ARG(bad_trap, lvl)
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#endif
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2016-10-13 11:36:13 +07:00
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#ifdef CONFIG_UPROBES
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#define UPROBES_TRAP(lvl) TRAP_ARG(uprobe_trap, lvl)
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#else
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#define UPROBES_TRAP(lvl) TRAP_ARG(bad_trap, lvl)
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#endif
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2008-06-20 01:26:19 +07:00
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#ifdef CONFIG_KGDB
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#define KGDB_TRAP(lvl) TRAP_IRQ(kgdb_trap, lvl)
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#else
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#define KGDB_TRAP(lvl) TRAP_ARG(bad_trap, lvl)
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#endif
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#define SUN4V_ITSB_MISS \
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ldxa [%g0] ASI_SCRATCHPAD, %g2; \
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ldx [%g2 + HV_FAULT_I_ADDR_OFFSET], %g4; \
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ldx [%g2 + HV_FAULT_I_CTX_OFFSET], %g5; \
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srlx %g4, 22, %g6; \
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ba,pt %xcc, sun4v_itsb_miss; \
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nop; \
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nop; \
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nop;
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#define SUN4V_DTSB_MISS \
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ldxa [%g0] ASI_SCRATCHPAD, %g2; \
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ldx [%g2 + HV_FAULT_D_ADDR_OFFSET], %g4; \
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ldx [%g2 + HV_FAULT_D_CTX_OFFSET], %g5; \
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srlx %g4, 22, %g6; \
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ba,pt %xcc, sun4v_dtsb_miss; \
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nop; \
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nop; \
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nop;
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/* Before touching these macros, you owe it to yourself to go and
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* see how arch/sparc64/kernel/winfixup.S works... -DaveM
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*
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* For the user cases we used to use the %asi register, but
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* it turns out that the "wr xxx, %asi" costs ~5 cycles, so
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* now we use immediate ASI loads and stores instead. Kudos
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* to Greg Onufer for pointing out this performance anomaly.
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*
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* Further note that we cannot use the g2, g4, g5, and g7 alternate
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* globals in the spill routines, check out the save instruction in
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* arch/sparc64/kernel/etrap.S to see what I mean about g2, and
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* g4/g5 are the globals which are preserved by etrap processing
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* for the caller of it. The g7 register is the return pc for
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* etrap. Finally, g6 is the current thread register so we cannot
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* us it in the spill handlers either. Most of these rules do not
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* apply to fill processing, only g6 is not usable.
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*/
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/* Normal kernel spill */
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#define SPILL_0_NORMAL \
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stx %l0, [%sp + STACK_BIAS + 0x00]; \
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stx %l1, [%sp + STACK_BIAS + 0x08]; \
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stx %l2, [%sp + STACK_BIAS + 0x10]; \
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stx %l3, [%sp + STACK_BIAS + 0x18]; \
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stx %l4, [%sp + STACK_BIAS + 0x20]; \
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stx %l5, [%sp + STACK_BIAS + 0x28]; \
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stx %l6, [%sp + STACK_BIAS + 0x30]; \
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stx %l7, [%sp + STACK_BIAS + 0x38]; \
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stx %i0, [%sp + STACK_BIAS + 0x40]; \
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stx %i1, [%sp + STACK_BIAS + 0x48]; \
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stx %i2, [%sp + STACK_BIAS + 0x50]; \
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stx %i3, [%sp + STACK_BIAS + 0x58]; \
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stx %i4, [%sp + STACK_BIAS + 0x60]; \
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stx %i5, [%sp + STACK_BIAS + 0x68]; \
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stx %i6, [%sp + STACK_BIAS + 0x70]; \
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stx %i7, [%sp + STACK_BIAS + 0x78]; \
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saved; retry; nop; nop; nop; nop; nop; nop; \
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nop; nop; nop; nop; nop; nop; nop; nop;
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#define SPILL_0_NORMAL_ETRAP \
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etrap_kernel_spill: \
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stx %l0, [%sp + STACK_BIAS + 0x00]; \
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stx %l1, [%sp + STACK_BIAS + 0x08]; \
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stx %l2, [%sp + STACK_BIAS + 0x10]; \
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stx %l3, [%sp + STACK_BIAS + 0x18]; \
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stx %l4, [%sp + STACK_BIAS + 0x20]; \
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stx %l5, [%sp + STACK_BIAS + 0x28]; \
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stx %l6, [%sp + STACK_BIAS + 0x30]; \
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stx %l7, [%sp + STACK_BIAS + 0x38]; \
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stx %i0, [%sp + STACK_BIAS + 0x40]; \
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stx %i1, [%sp + STACK_BIAS + 0x48]; \
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stx %i2, [%sp + STACK_BIAS + 0x50]; \
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stx %i3, [%sp + STACK_BIAS + 0x58]; \
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stx %i4, [%sp + STACK_BIAS + 0x60]; \
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stx %i5, [%sp + STACK_BIAS + 0x68]; \
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stx %i6, [%sp + STACK_BIAS + 0x70]; \
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stx %i7, [%sp + STACK_BIAS + 0x78]; \
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saved; \
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sub %g1, 2, %g1; \
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ba,pt %xcc, etrap_save; \
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wrpr %g1, %cwp; \
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|
nop; nop; nop; nop; nop; nop; nop; nop; \
|
|
|
|
|
nop; nop; nop; nop;
|
|
|
|
|
|
|
|
|
|
/* Normal 64bit spill */
|
|
|
|
|
#define SPILL_1_GENERIC(ASI) \
|
|
|
|
|
add %sp, STACK_BIAS + 0x00, %g1; \
|
|
|
|
|
stxa %l0, [%g1 + %g0] ASI; \
|
|
|
|
|
mov 0x08, %g3; \
|
|
|
|
|
stxa %l1, [%g1 + %g3] ASI; \
|
|
|
|
|
add %g1, 0x10, %g1; \
|
|
|
|
|
stxa %l2, [%g1 + %g0] ASI; \
|
|
|
|
|
stxa %l3, [%g1 + %g3] ASI; \
|
|
|
|
|
add %g1, 0x10, %g1; \
|
|
|
|
|
stxa %l4, [%g1 + %g0] ASI; \
|
|
|
|
|
stxa %l5, [%g1 + %g3] ASI; \
|
|
|
|
|
add %g1, 0x10, %g1; \
|
|
|
|
|
stxa %l6, [%g1 + %g0] ASI; \
|
|
|
|
|
stxa %l7, [%g1 + %g3] ASI; \
|
|
|
|
|
add %g1, 0x10, %g1; \
|
|
|
|
|
stxa %i0, [%g1 + %g0] ASI; \
|
|
|
|
|
stxa %i1, [%g1 + %g3] ASI; \
|
|
|
|
|
add %g1, 0x10, %g1; \
|
|
|
|
|
stxa %i2, [%g1 + %g0] ASI; \
|
|
|
|
|
stxa %i3, [%g1 + %g3] ASI; \
|
|
|
|
|
add %g1, 0x10, %g1; \
|
|
|
|
|
stxa %i4, [%g1 + %g0] ASI; \
|
|
|
|
|
stxa %i5, [%g1 + %g3] ASI; \
|
|
|
|
|
add %g1, 0x10, %g1; \
|
|
|
|
|
stxa %i6, [%g1 + %g0] ASI; \
|
|
|
|
|
stxa %i7, [%g1 + %g3] ASI; \
|
|
|
|
|
saved; \
|
|
|
|
|
retry; nop; nop; \
|
|
|
|
|
b,a,pt %xcc, spill_fixup_dax; \
|
|
|
|
|
b,a,pt %xcc, spill_fixup_mna; \
|
|
|
|
|
b,a,pt %xcc, spill_fixup;
|
|
|
|
|
|
|
|
|
|
#define SPILL_1_GENERIC_ETRAP \
|
|
|
|
|
etrap_user_spill_64bit: \
|
|
|
|
|
stxa %l0, [%sp + STACK_BIAS + 0x00] %asi; \
|
|
|
|
|
stxa %l1, [%sp + STACK_BIAS + 0x08] %asi; \
|
|
|
|
|
stxa %l2, [%sp + STACK_BIAS + 0x10] %asi; \
|
|
|
|
|
stxa %l3, [%sp + STACK_BIAS + 0x18] %asi; \
|
|
|
|
|
stxa %l4, [%sp + STACK_BIAS + 0x20] %asi; \
|
|
|
|
|
stxa %l5, [%sp + STACK_BIAS + 0x28] %asi; \
|
|
|
|
|
stxa %l6, [%sp + STACK_BIAS + 0x30] %asi; \
|
|
|
|
|
stxa %l7, [%sp + STACK_BIAS + 0x38] %asi; \
|
|
|
|
|
stxa %i0, [%sp + STACK_BIAS + 0x40] %asi; \
|
|
|
|
|
stxa %i1, [%sp + STACK_BIAS + 0x48] %asi; \
|
|
|
|
|
stxa %i2, [%sp + STACK_BIAS + 0x50] %asi; \
|
|
|
|
|
stxa %i3, [%sp + STACK_BIAS + 0x58] %asi; \
|
|
|
|
|
stxa %i4, [%sp + STACK_BIAS + 0x60] %asi; \
|
|
|
|
|
stxa %i5, [%sp + STACK_BIAS + 0x68] %asi; \
|
|
|
|
|
stxa %i6, [%sp + STACK_BIAS + 0x70] %asi; \
|
|
|
|
|
stxa %i7, [%sp + STACK_BIAS + 0x78] %asi; \
|
|
|
|
|
saved; \
|
|
|
|
|
sub %g1, 2, %g1; \
|
|
|
|
|
ba,pt %xcc, etrap_save; \
|
|
|
|
|
wrpr %g1, %cwp; \
|
|
|
|
|
nop; nop; nop; nop; nop; \
|
|
|
|
|
nop; nop; nop; nop; \
|
|
|
|
|
ba,a,pt %xcc, etrap_spill_fixup_64bit; \
|
|
|
|
|
ba,a,pt %xcc, etrap_spill_fixup_64bit; \
|
|
|
|
|
ba,a,pt %xcc, etrap_spill_fixup_64bit;
|
|
|
|
|
|
|
|
|
|
#define SPILL_1_GENERIC_ETRAP_FIXUP \
|
|
|
|
|
etrap_spill_fixup_64bit: \
|
|
|
|
|
ldub [%g6 + TI_WSAVED], %g1; \
|
|
|
|
|
sll %g1, 3, %g3; \
|
|
|
|
|
add %g6, %g3, %g3; \
|
|
|
|
|
stx %sp, [%g3 + TI_RWIN_SPTRS]; \
|
|
|
|
|
sll %g1, 7, %g3; \
|
|
|
|
|
add %g6, %g3, %g3; \
|
|
|
|
|
stx %l0, [%g3 + TI_REG_WINDOW + 0x00]; \
|
|
|
|
|
stx %l1, [%g3 + TI_REG_WINDOW + 0x08]; \
|
|
|
|
|
stx %l2, [%g3 + TI_REG_WINDOW + 0x10]; \
|
|
|
|
|
stx %l3, [%g3 + TI_REG_WINDOW + 0x18]; \
|
|
|
|
|
stx %l4, [%g3 + TI_REG_WINDOW + 0x20]; \
|
|
|
|
|
stx %l5, [%g3 + TI_REG_WINDOW + 0x28]; \
|
|
|
|
|
stx %l6, [%g3 + TI_REG_WINDOW + 0x30]; \
|
|
|
|
|
stx %l7, [%g3 + TI_REG_WINDOW + 0x38]; \
|
|
|
|
|
stx %i0, [%g3 + TI_REG_WINDOW + 0x40]; \
|
|
|
|
|
stx %i1, [%g3 + TI_REG_WINDOW + 0x48]; \
|
|
|
|
|
stx %i2, [%g3 + TI_REG_WINDOW + 0x50]; \
|
|
|
|
|
stx %i3, [%g3 + TI_REG_WINDOW + 0x58]; \
|
|
|
|
|
stx %i4, [%g3 + TI_REG_WINDOW + 0x60]; \
|
|
|
|
|
stx %i5, [%g3 + TI_REG_WINDOW + 0x68]; \
|
|
|
|
|
stx %i6, [%g3 + TI_REG_WINDOW + 0x70]; \
|
|
|
|
|
stx %i7, [%g3 + TI_REG_WINDOW + 0x78]; \
|
|
|
|
|
add %g1, 1, %g1; \
|
|
|
|
|
stb %g1, [%g6 + TI_WSAVED]; \
|
|
|
|
|
saved; \
|
|
|
|
|
rdpr %cwp, %g1; \
|
|
|
|
|
sub %g1, 2, %g1; \
|
|
|
|
|
ba,pt %xcc, etrap_save; \
|
|
|
|
|
wrpr %g1, %cwp; \
|
|
|
|
|
nop; nop; nop
|
|
|
|
|
|
|
|
|
|
/* Normal 32bit spill */
|
|
|
|
|
#define SPILL_2_GENERIC(ASI) \
|
sparc64: Make montmul/montsqr/mpmul usable in 32-bit threads.
The Montgomery Multiply, Montgomery Square, and Multiple-Precision
Multiply instructions work by loading a combination of the floating
point and multiple register windows worth of integer registers
with the inputs.
These values are 64-bit. But for 32-bit userland processes we only
save the low 32-bits of each integer register during a register spill.
This is because the register window save area is in the user stack and
has a fixed layout.
Therefore, the only way to use these instruction in 32-bit mode is to
perform the following sequence:
1) Load the top-32bits of a choosen integer register with a sentinel,
say "-1". This will be in the outer-most register window.
The idea is that we're trying to see if the outer-most register
window gets spilled, and thus the 64-bit values were truncated.
2) Load all the inputs for the montmul/montsqr/mpmul instruction,
down to the inner-most register window.
3) Execute the opcode.
4) Traverse back up to the outer-most register window.
5) Check the sentinel, if it's still "-1" store the results.
Otherwise retry the entire sequence.
This retry is extremely troublesome. If you're just unlucky and an
interrupt or other trap happens, it'll push that outer-most window to
the stack and clear the sentinel when we restore it.
We could retry forever and never make forward progress if interrupts
arrive at a fast enough rate (consider perf events as one example).
So we have do limited retries and fallback to software which is
extremely non-deterministic.
Luckily it's very straightforward to provide a mechanism to let
32-bit applications use a 64-bit stack. Stacks in 64-bit mode are
biased by 2047 bytes, which means that the lowest bit is set in the
actual %sp register value.
So if we see bit zero set in a 32-bit application's stack we treat
it like a 64-bit stack.
Runtime detection of such a facility is tricky, and cumbersome at
best. For example, just trying to use a biased stack and seeing if it
works is hard to recover from (the signal handler will need to use an
alt stack, plus something along the lines of longjmp). Therefore, we
add a system call to report a bitmask of arch specific features like
this in a cheap and less hairy way.
With help from Andy Polyakov.
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-10-27 05:18:37 +07:00
|
|
|
and %sp, 1, %g3; \
|
|
|
|
|
brnz,pn %g3, (. - (128 + 4)); \
|
|
|
|
|
srl %sp, 0, %sp; \
|
2008-06-20 01:26:19 +07:00
|
|
|
stwa %l0, [%sp + %g0] ASI; \
|
|
|
|
|
mov 0x04, %g3; \
|
|
|
|
|
stwa %l1, [%sp + %g3] ASI; \
|
|
|
|
|
add %sp, 0x08, %g1; \
|
|
|
|
|
stwa %l2, [%g1 + %g0] ASI; \
|
|
|
|
|
stwa %l3, [%g1 + %g3] ASI; \
|
|
|
|
|
add %g1, 0x08, %g1; \
|
|
|
|
|
stwa %l4, [%g1 + %g0] ASI; \
|
|
|
|
|
stwa %l5, [%g1 + %g3] ASI; \
|
|
|
|
|
add %g1, 0x08, %g1; \
|
|
|
|
|
stwa %l6, [%g1 + %g0] ASI; \
|
|
|
|
|
stwa %l7, [%g1 + %g3] ASI; \
|
|
|
|
|
add %g1, 0x08, %g1; \
|
|
|
|
|
stwa %i0, [%g1 + %g0] ASI; \
|
|
|
|
|
stwa %i1, [%g1 + %g3] ASI; \
|
|
|
|
|
add %g1, 0x08, %g1; \
|
|
|
|
|
stwa %i2, [%g1 + %g0] ASI; \
|
|
|
|
|
stwa %i3, [%g1 + %g3] ASI; \
|
|
|
|
|
add %g1, 0x08, %g1; \
|
|
|
|
|
stwa %i4, [%g1 + %g0] ASI; \
|
|
|
|
|
stwa %i5, [%g1 + %g3] ASI; \
|
|
|
|
|
add %g1, 0x08, %g1; \
|
|
|
|
|
stwa %i6, [%g1 + %g0] ASI; \
|
|
|
|
|
stwa %i7, [%g1 + %g3] ASI; \
|
|
|
|
|
saved; \
|
sparc64: Make montmul/montsqr/mpmul usable in 32-bit threads.
The Montgomery Multiply, Montgomery Square, and Multiple-Precision
Multiply instructions work by loading a combination of the floating
point and multiple register windows worth of integer registers
with the inputs.
These values are 64-bit. But for 32-bit userland processes we only
save the low 32-bits of each integer register during a register spill.
This is because the register window save area is in the user stack and
has a fixed layout.
Therefore, the only way to use these instruction in 32-bit mode is to
perform the following sequence:
1) Load the top-32bits of a choosen integer register with a sentinel,
say "-1". This will be in the outer-most register window.
The idea is that we're trying to see if the outer-most register
window gets spilled, and thus the 64-bit values were truncated.
2) Load all the inputs for the montmul/montsqr/mpmul instruction,
down to the inner-most register window.
3) Execute the opcode.
4) Traverse back up to the outer-most register window.
5) Check the sentinel, if it's still "-1" store the results.
Otherwise retry the entire sequence.
This retry is extremely troublesome. If you're just unlucky and an
interrupt or other trap happens, it'll push that outer-most window to
the stack and clear the sentinel when we restore it.
We could retry forever and never make forward progress if interrupts
arrive at a fast enough rate (consider perf events as one example).
So we have do limited retries and fallback to software which is
extremely non-deterministic.
Luckily it's very straightforward to provide a mechanism to let
32-bit applications use a 64-bit stack. Stacks in 64-bit mode are
biased by 2047 bytes, which means that the lowest bit is set in the
actual %sp register value.
So if we see bit zero set in a 32-bit application's stack we treat
it like a 64-bit stack.
Runtime detection of such a facility is tricky, and cumbersome at
best. For example, just trying to use a biased stack and seeing if it
works is hard to recover from (the signal handler will need to use an
alt stack, plus something along the lines of longjmp). Therefore, we
add a system call to report a bitmask of arch specific features like
this in a cheap and less hairy way.
With help from Andy Polyakov.
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-10-27 05:18:37 +07:00
|
|
|
retry; \
|
2008-06-20 01:26:19 +07:00
|
|
|
b,a,pt %xcc, spill_fixup_dax; \
|
|
|
|
|
b,a,pt %xcc, spill_fixup_mna; \
|
|
|
|
|
b,a,pt %xcc, spill_fixup;
|
|
|
|
|
|
|
|
|
|
#define SPILL_2_GENERIC_ETRAP \
|
|
|
|
|
etrap_user_spill_32bit: \
|
sparc64: Make montmul/montsqr/mpmul usable in 32-bit threads.
The Montgomery Multiply, Montgomery Square, and Multiple-Precision
Multiply instructions work by loading a combination of the floating
point and multiple register windows worth of integer registers
with the inputs.
These values are 64-bit. But for 32-bit userland processes we only
save the low 32-bits of each integer register during a register spill.
This is because the register window save area is in the user stack and
has a fixed layout.
Therefore, the only way to use these instruction in 32-bit mode is to
perform the following sequence:
1) Load the top-32bits of a choosen integer register with a sentinel,
say "-1". This will be in the outer-most register window.
The idea is that we're trying to see if the outer-most register
window gets spilled, and thus the 64-bit values were truncated.
2) Load all the inputs for the montmul/montsqr/mpmul instruction,
down to the inner-most register window.
3) Execute the opcode.
4) Traverse back up to the outer-most register window.
5) Check the sentinel, if it's still "-1" store the results.
Otherwise retry the entire sequence.
This retry is extremely troublesome. If you're just unlucky and an
interrupt or other trap happens, it'll push that outer-most window to
the stack and clear the sentinel when we restore it.
We could retry forever and never make forward progress if interrupts
arrive at a fast enough rate (consider perf events as one example).
So we have do limited retries and fallback to software which is
extremely non-deterministic.
Luckily it's very straightforward to provide a mechanism to let
32-bit applications use a 64-bit stack. Stacks in 64-bit mode are
biased by 2047 bytes, which means that the lowest bit is set in the
actual %sp register value.
So if we see bit zero set in a 32-bit application's stack we treat
it like a 64-bit stack.
Runtime detection of such a facility is tricky, and cumbersome at
best. For example, just trying to use a biased stack and seeing if it
works is hard to recover from (the signal handler will need to use an
alt stack, plus something along the lines of longjmp). Therefore, we
add a system call to report a bitmask of arch specific features like
this in a cheap and less hairy way.
With help from Andy Polyakov.
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-10-27 05:18:37 +07:00
|
|
|
and %sp, 1, %g3; \
|
|
|
|
|
brnz,pn %g3, etrap_user_spill_64bit; \
|
|
|
|
|
srl %sp, 0, %sp; \
|
2008-06-20 01:26:19 +07:00
|
|
|
stwa %l0, [%sp + 0x00] %asi; \
|
|
|
|
|
stwa %l1, [%sp + 0x04] %asi; \
|
|
|
|
|
stwa %l2, [%sp + 0x08] %asi; \
|
|
|
|
|
stwa %l3, [%sp + 0x0c] %asi; \
|
|
|
|
|
stwa %l4, [%sp + 0x10] %asi; \
|
|
|
|
|
stwa %l5, [%sp + 0x14] %asi; \
|
|
|
|
|
stwa %l6, [%sp + 0x18] %asi; \
|
|
|
|
|
stwa %l7, [%sp + 0x1c] %asi; \
|
|
|
|
|
stwa %i0, [%sp + 0x20] %asi; \
|
|
|
|
|
stwa %i1, [%sp + 0x24] %asi; \
|
|
|
|
|
stwa %i2, [%sp + 0x28] %asi; \
|
|
|
|
|
stwa %i3, [%sp + 0x2c] %asi; \
|
|
|
|
|
stwa %i4, [%sp + 0x30] %asi; \
|
|
|
|
|
stwa %i5, [%sp + 0x34] %asi; \
|
|
|
|
|
stwa %i6, [%sp + 0x38] %asi; \
|
|
|
|
|
stwa %i7, [%sp + 0x3c] %asi; \
|
|
|
|
|
saved; \
|
|
|
|
|
sub %g1, 2, %g1; \
|
|
|
|
|
ba,pt %xcc, etrap_save; \
|
|
|
|
|
wrpr %g1, %cwp; \
|
|
|
|
|
nop; nop; nop; nop; \
|
sparc64: Make montmul/montsqr/mpmul usable in 32-bit threads.
The Montgomery Multiply, Montgomery Square, and Multiple-Precision
Multiply instructions work by loading a combination of the floating
point and multiple register windows worth of integer registers
with the inputs.
These values are 64-bit. But for 32-bit userland processes we only
save the low 32-bits of each integer register during a register spill.
This is because the register window save area is in the user stack and
has a fixed layout.
Therefore, the only way to use these instruction in 32-bit mode is to
perform the following sequence:
1) Load the top-32bits of a choosen integer register with a sentinel,
say "-1". This will be in the outer-most register window.
The idea is that we're trying to see if the outer-most register
window gets spilled, and thus the 64-bit values were truncated.
2) Load all the inputs for the montmul/montsqr/mpmul instruction,
down to the inner-most register window.
3) Execute the opcode.
4) Traverse back up to the outer-most register window.
5) Check the sentinel, if it's still "-1" store the results.
Otherwise retry the entire sequence.
This retry is extremely troublesome. If you're just unlucky and an
interrupt or other trap happens, it'll push that outer-most window to
the stack and clear the sentinel when we restore it.
We could retry forever and never make forward progress if interrupts
arrive at a fast enough rate (consider perf events as one example).
So we have do limited retries and fallback to software which is
extremely non-deterministic.
Luckily it's very straightforward to provide a mechanism to let
32-bit applications use a 64-bit stack. Stacks in 64-bit mode are
biased by 2047 bytes, which means that the lowest bit is set in the
actual %sp register value.
So if we see bit zero set in a 32-bit application's stack we treat
it like a 64-bit stack.
Runtime detection of such a facility is tricky, and cumbersome at
best. For example, just trying to use a biased stack and seeing if it
works is hard to recover from (the signal handler will need to use an
alt stack, plus something along the lines of longjmp). Therefore, we
add a system call to report a bitmask of arch specific features like
this in a cheap and less hairy way.
With help from Andy Polyakov.
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-10-27 05:18:37 +07:00
|
|
|
nop; nop; \
|
2008-06-20 01:26:19 +07:00
|
|
|
ba,a,pt %xcc, etrap_spill_fixup_32bit; \
|
|
|
|
|
ba,a,pt %xcc, etrap_spill_fixup_32bit; \
|
|
|
|
|
ba,a,pt %xcc, etrap_spill_fixup_32bit;
|
|
|
|
|
|
|
|
|
|
#define SPILL_2_GENERIC_ETRAP_FIXUP \
|
|
|
|
|
etrap_spill_fixup_32bit: \
|
|
|
|
|
ldub [%g6 + TI_WSAVED], %g1; \
|
|
|
|
|
sll %g1, 3, %g3; \
|
|
|
|
|
add %g6, %g3, %g3; \
|
|
|
|
|
stx %sp, [%g3 + TI_RWIN_SPTRS]; \
|
|
|
|
|
sll %g1, 7, %g3; \
|
|
|
|
|
add %g6, %g3, %g3; \
|
|
|
|
|
stw %l0, [%g3 + TI_REG_WINDOW + 0x00]; \
|
|
|
|
|
stw %l1, [%g3 + TI_REG_WINDOW + 0x04]; \
|
|
|
|
|
stw %l2, [%g3 + TI_REG_WINDOW + 0x08]; \
|
|
|
|
|
stw %l3, [%g3 + TI_REG_WINDOW + 0x0c]; \
|
|
|
|
|
stw %l4, [%g3 + TI_REG_WINDOW + 0x10]; \
|
|
|
|
|
stw %l5, [%g3 + TI_REG_WINDOW + 0x14]; \
|
|
|
|
|
stw %l6, [%g3 + TI_REG_WINDOW + 0x18]; \
|
|
|
|
|
stw %l7, [%g3 + TI_REG_WINDOW + 0x1c]; \
|
|
|
|
|
stw %i0, [%g3 + TI_REG_WINDOW + 0x20]; \
|
|
|
|
|
stw %i1, [%g3 + TI_REG_WINDOW + 0x24]; \
|
|
|
|
|
stw %i2, [%g3 + TI_REG_WINDOW + 0x28]; \
|
|
|
|
|
stw %i3, [%g3 + TI_REG_WINDOW + 0x2c]; \
|
|
|
|
|
stw %i4, [%g3 + TI_REG_WINDOW + 0x30]; \
|
|
|
|
|
stw %i5, [%g3 + TI_REG_WINDOW + 0x34]; \
|
|
|
|
|
stw %i6, [%g3 + TI_REG_WINDOW + 0x38]; \
|
|
|
|
|
stw %i7, [%g3 + TI_REG_WINDOW + 0x3c]; \
|
|
|
|
|
add %g1, 1, %g1; \
|
|
|
|
|
stb %g1, [%g6 + TI_WSAVED]; \
|
|
|
|
|
saved; \
|
|
|
|
|
rdpr %cwp, %g1; \
|
|
|
|
|
sub %g1, 2, %g1; \
|
|
|
|
|
ba,pt %xcc, etrap_save; \
|
|
|
|
|
wrpr %g1, %cwp; \
|
|
|
|
|
nop; nop; nop
|
|
|
|
|
|
|
|
|
|
#define SPILL_1_NORMAL SPILL_1_GENERIC(ASI_AIUP)
|
|
|
|
|
#define SPILL_2_NORMAL SPILL_2_GENERIC(ASI_AIUP)
|
|
|
|
|
#define SPILL_3_NORMAL SPILL_0_NORMAL
|
|
|
|
|
#define SPILL_4_NORMAL SPILL_0_NORMAL
|
|
|
|
|
#define SPILL_5_NORMAL SPILL_0_NORMAL
|
|
|
|
|
#define SPILL_6_NORMAL SPILL_0_NORMAL
|
|
|
|
|
#define SPILL_7_NORMAL SPILL_0_NORMAL
|
|
|
|
|
|
|
|
|
|
#define SPILL_0_OTHER SPILL_0_NORMAL
|
|
|
|
|
#define SPILL_1_OTHER SPILL_1_GENERIC(ASI_AIUS)
|
|
|
|
|
#define SPILL_2_OTHER SPILL_2_GENERIC(ASI_AIUS)
|
|
|
|
|
#define SPILL_3_OTHER SPILL_3_NORMAL
|
|
|
|
|
#define SPILL_4_OTHER SPILL_4_NORMAL
|
|
|
|
|
#define SPILL_5_OTHER SPILL_5_NORMAL
|
|
|
|
|
#define SPILL_6_OTHER SPILL_6_NORMAL
|
|
|
|
|
#define SPILL_7_OTHER SPILL_7_NORMAL
|
|
|
|
|
|
|
|
|
|
/* Normal kernel fill */
|
|
|
|
|
#define FILL_0_NORMAL \
|
|
|
|
|
ldx [%sp + STACK_BIAS + 0x00], %l0; \
|
|
|
|
|
ldx [%sp + STACK_BIAS + 0x08], %l1; \
|
|
|
|
|
ldx [%sp + STACK_BIAS + 0x10], %l2; \
|
|
|
|
|
ldx [%sp + STACK_BIAS + 0x18], %l3; \
|
|
|
|
|
ldx [%sp + STACK_BIAS + 0x20], %l4; \
|
|
|
|
|
ldx [%sp + STACK_BIAS + 0x28], %l5; \
|
|
|
|
|
ldx [%sp + STACK_BIAS + 0x30], %l6; \
|
|
|
|
|
ldx [%sp + STACK_BIAS + 0x38], %l7; \
|
|
|
|
|
ldx [%sp + STACK_BIAS + 0x40], %i0; \
|
|
|
|
|
ldx [%sp + STACK_BIAS + 0x48], %i1; \
|
|
|
|
|
ldx [%sp + STACK_BIAS + 0x50], %i2; \
|
|
|
|
|
ldx [%sp + STACK_BIAS + 0x58], %i3; \
|
|
|
|
|
ldx [%sp + STACK_BIAS + 0x60], %i4; \
|
|
|
|
|
ldx [%sp + STACK_BIAS + 0x68], %i5; \
|
|
|
|
|
ldx [%sp + STACK_BIAS + 0x70], %i6; \
|
|
|
|
|
ldx [%sp + STACK_BIAS + 0x78], %i7; \
|
|
|
|
|
restored; retry; nop; nop; nop; nop; nop; nop; \
|
|
|
|
|
nop; nop; nop; nop; nop; nop; nop; nop;
|
|
|
|
|
|
|
|
|
|
#define FILL_0_NORMAL_RTRAP \
|
|
|
|
|
kern_rtt_fill: \
|
|
|
|
|
rdpr %cwp, %g1; \
|
|
|
|
|
sub %g1, 1, %g1; \
|
|
|
|
|
wrpr %g1, %cwp; \
|
|
|
|
|
ldx [%sp + STACK_BIAS + 0x00], %l0; \
|
|
|
|
|
ldx [%sp + STACK_BIAS + 0x08], %l1; \
|
|
|
|
|
ldx [%sp + STACK_BIAS + 0x10], %l2; \
|
|
|
|
|
ldx [%sp + STACK_BIAS + 0x18], %l3; \
|
|
|
|
|
ldx [%sp + STACK_BIAS + 0x20], %l4; \
|
|
|
|
|
ldx [%sp + STACK_BIAS + 0x28], %l5; \
|
|
|
|
|
ldx [%sp + STACK_BIAS + 0x30], %l6; \
|
|
|
|
|
ldx [%sp + STACK_BIAS + 0x38], %l7; \
|
|
|
|
|
ldx [%sp + STACK_BIAS + 0x40], %i0; \
|
|
|
|
|
ldx [%sp + STACK_BIAS + 0x48], %i1; \
|
|
|
|
|
ldx [%sp + STACK_BIAS + 0x50], %i2; \
|
|
|
|
|
ldx [%sp + STACK_BIAS + 0x58], %i3; \
|
|
|
|
|
ldx [%sp + STACK_BIAS + 0x60], %i4; \
|
|
|
|
|
ldx [%sp + STACK_BIAS + 0x68], %i5; \
|
|
|
|
|
ldx [%sp + STACK_BIAS + 0x70], %i6; \
|
|
|
|
|
ldx [%sp + STACK_BIAS + 0x78], %i7; \
|
|
|
|
|
restored; \
|
|
|
|
|
add %g1, 1, %g1; \
|
|
|
|
|
ba,pt %xcc, kern_rtt_restore; \
|
|
|
|
|
wrpr %g1, %cwp; \
|
|
|
|
|
nop; nop; nop; nop; nop; \
|
|
|
|
|
nop; nop; nop; nop;
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/* Normal 64bit fill */
|
|
|
|
|
#define FILL_1_GENERIC(ASI) \
|
|
|
|
|
add %sp, STACK_BIAS + 0x00, %g1; \
|
|
|
|
|
ldxa [%g1 + %g0] ASI, %l0; \
|
|
|
|
|
mov 0x08, %g2; \
|
|
|
|
|
mov 0x10, %g3; \
|
|
|
|
|
ldxa [%g1 + %g2] ASI, %l1; \
|
|
|
|
|
mov 0x18, %g5; \
|
|
|
|
|
ldxa [%g1 + %g3] ASI, %l2; \
|
|
|
|
|
ldxa [%g1 + %g5] ASI, %l3; \
|
|
|
|
|
add %g1, 0x20, %g1; \
|
|
|
|
|
ldxa [%g1 + %g0] ASI, %l4; \
|
|
|
|
|
ldxa [%g1 + %g2] ASI, %l5; \
|
|
|
|
|
ldxa [%g1 + %g3] ASI, %l6; \
|
|
|
|
|
ldxa [%g1 + %g5] ASI, %l7; \
|
|
|
|
|
add %g1, 0x20, %g1; \
|
|
|
|
|
ldxa [%g1 + %g0] ASI, %i0; \
|
|
|
|
|
ldxa [%g1 + %g2] ASI, %i1; \
|
|
|
|
|
ldxa [%g1 + %g3] ASI, %i2; \
|
|
|
|
|
ldxa [%g1 + %g5] ASI, %i3; \
|
|
|
|
|
add %g1, 0x20, %g1; \
|
|
|
|
|
ldxa [%g1 + %g0] ASI, %i4; \
|
|
|
|
|
ldxa [%g1 + %g2] ASI, %i5; \
|
|
|
|
|
ldxa [%g1 + %g3] ASI, %i6; \
|
|
|
|
|
ldxa [%g1 + %g5] ASI, %i7; \
|
|
|
|
|
restored; \
|
|
|
|
|
retry; nop; nop; nop; nop; \
|
|
|
|
|
b,a,pt %xcc, fill_fixup_dax; \
|
|
|
|
|
b,a,pt %xcc, fill_fixup_mna; \
|
|
|
|
|
b,a,pt %xcc, fill_fixup;
|
|
|
|
|
|
|
|
|
|
#define FILL_1_GENERIC_RTRAP \
|
|
|
|
|
user_rtt_fill_64bit: \
|
|
|
|
|
ldxa [%sp + STACK_BIAS + 0x00] %asi, %l0; \
|
|
|
|
|
ldxa [%sp + STACK_BIAS + 0x08] %asi, %l1; \
|
|
|
|
|
ldxa [%sp + STACK_BIAS + 0x10] %asi, %l2; \
|
|
|
|
|
ldxa [%sp + STACK_BIAS + 0x18] %asi, %l3; \
|
|
|
|
|
ldxa [%sp + STACK_BIAS + 0x20] %asi, %l4; \
|
|
|
|
|
ldxa [%sp + STACK_BIAS + 0x28] %asi, %l5; \
|
|
|
|
|
ldxa [%sp + STACK_BIAS + 0x30] %asi, %l6; \
|
|
|
|
|
ldxa [%sp + STACK_BIAS + 0x38] %asi, %l7; \
|
|
|
|
|
ldxa [%sp + STACK_BIAS + 0x40] %asi, %i0; \
|
|
|
|
|
ldxa [%sp + STACK_BIAS + 0x48] %asi, %i1; \
|
|
|
|
|
ldxa [%sp + STACK_BIAS + 0x50] %asi, %i2; \
|
|
|
|
|
ldxa [%sp + STACK_BIAS + 0x58] %asi, %i3; \
|
|
|
|
|
ldxa [%sp + STACK_BIAS + 0x60] %asi, %i4; \
|
|
|
|
|
ldxa [%sp + STACK_BIAS + 0x68] %asi, %i5; \
|
|
|
|
|
ldxa [%sp + STACK_BIAS + 0x70] %asi, %i6; \
|
|
|
|
|
ldxa [%sp + STACK_BIAS + 0x78] %asi, %i7; \
|
|
|
|
|
ba,pt %xcc, user_rtt_pre_restore; \
|
|
|
|
|
restored; \
|
|
|
|
|
nop; nop; nop; nop; nop; nop; \
|
|
|
|
|
nop; nop; nop; nop; nop; \
|
sparc64: Fix return from trap window fill crashes.
We must handle data access exception as well as memory address unaligned
exceptions from return from trap window fill faults, not just normal
TLB misses.
Otherwise we can get an OOPS that looks like this:
ld-linux.so.2(36808): Kernel bad sw trap 5 [#1]
CPU: 1 PID: 36808 Comm: ld-linux.so.2 Not tainted 4.6.0 #34
task: fff8000303be5c60 ti: fff8000301344000 task.ti: fff8000301344000
TSTATE: 0000004410001601 TPC: 0000000000a1a784 TNPC: 0000000000a1a788 Y: 00000002 Not tainted
TPC: <do_sparc64_fault+0x5c4/0x700>
g0: fff8000024fc8248 g1: 0000000000db04dc g2: 0000000000000000 g3: 0000000000000001
g4: fff8000303be5c60 g5: fff800030e672000 g6: fff8000301344000 g7: 0000000000000001
o0: 0000000000b95ee8 o1: 000000000000012b o2: 0000000000000000 o3: 0000000200b9b358
o4: 0000000000000000 o5: fff8000301344040 sp: fff80003013475c1 ret_pc: 0000000000a1a77c
RPC: <do_sparc64_fault+0x5bc/0x700>
l0: 00000000000007ff l1: 0000000000000000 l2: 000000000000005f l3: 0000000000000000
l4: fff8000301347e98 l5: fff8000024ff3060 l6: 0000000000000000 l7: 0000000000000000
i0: fff8000301347f60 i1: 0000000000102400 i2: 0000000000000000 i3: 0000000000000000
i4: 0000000000000000 i5: 0000000000000000 i6: fff80003013476a1 i7: 0000000000404d4c
I7: <user_rtt_fill_fixup+0x6c/0x7c>
Call Trace:
[0000000000404d4c] user_rtt_fill_fixup+0x6c/0x7c
The window trap handlers are slightly clever, the trap table entries for them are
composed of two pieces of code. First comes the code that actually performs
the window fill or spill trap handling, and then there are three instructions at
the end which are for exception processing.
The userland register window fill handler is:
add %sp, STACK_BIAS + 0x00, %g1; \
ldxa [%g1 + %g0] ASI, %l0; \
mov 0x08, %g2; \
mov 0x10, %g3; \
ldxa [%g1 + %g2] ASI, %l1; \
mov 0x18, %g5; \
ldxa [%g1 + %g3] ASI, %l2; \
ldxa [%g1 + %g5] ASI, %l3; \
add %g1, 0x20, %g1; \
ldxa [%g1 + %g0] ASI, %l4; \
ldxa [%g1 + %g2] ASI, %l5; \
ldxa [%g1 + %g3] ASI, %l6; \
ldxa [%g1 + %g5] ASI, %l7; \
add %g1, 0x20, %g1; \
ldxa [%g1 + %g0] ASI, %i0; \
ldxa [%g1 + %g2] ASI, %i1; \
ldxa [%g1 + %g3] ASI, %i2; \
ldxa [%g1 + %g5] ASI, %i3; \
add %g1, 0x20, %g1; \
ldxa [%g1 + %g0] ASI, %i4; \
ldxa [%g1 + %g2] ASI, %i5; \
ldxa [%g1 + %g3] ASI, %i6; \
ldxa [%g1 + %g5] ASI, %i7; \
restored; \
retry; nop; nop; nop; nop; \
b,a,pt %xcc, fill_fixup_dax; \
b,a,pt %xcc, fill_fixup_mna; \
b,a,pt %xcc, fill_fixup;
And the way this works is that if any of those memory accesses
generate an exception, the exception handler can revector to one of
those final three branch instructions depending upon which kind of
exception the memory access took. In this way, the fault handler
doesn't have to know if it was a spill or a fill that it's handling
the fault for. It just always branches to the last instruction in
the parent trap's handler.
For example, for a regular fault, the code goes:
winfix_trampoline:
rdpr %tpc, %g3
or %g3, 0x7c, %g3
wrpr %g3, %tnpc
done
All window trap handlers are 0x80 aligned, so if we "or" 0x7c into the
trap time program counter, we'll get that final instruction in the
trap handler.
On return from trap, we have to pull the register window in but we do
this by hand instead of just executing a "restore" instruction for
several reasons. The largest being that from Niagara and onward we
simply don't have enough levels in the trap stack to fully resolve all
possible exception cases of a window fault when we are already at
trap level 1 (which we enter to get ready to return from the original
trap).
This is executed inline via the FILL_*_RTRAP handlers. rtrap_64.S's
code branches directly to these to do the window fill by hand if
necessary. Now if you look at them, we'll see at the end:
ba,a,pt %xcc, user_rtt_fill_fixup;
ba,a,pt %xcc, user_rtt_fill_fixup;
ba,a,pt %xcc, user_rtt_fill_fixup;
And oops, all three cases are handled like a fault.
This doesn't work because each of these trap types (data access
exception, memory address unaligned, and faults) store their auxiliary
info in different registers to pass on to the C handler which does the
real work.
So in the case where the stack was unaligned, the unaligned trap
handler sets up the arg registers one way, and then we branched to
the fault handler which expects them setup another way.
So the FAULT_TYPE_* value ends up basically being garbage, and
randomly would generate the backtrace seen above.
Reported-by: Nick Alcock <nix@esperi.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
2016-05-29 10:41:12 +07:00
|
|
|
ba,a,pt %xcc, user_rtt_fill_fixup_dax; \
|
|
|
|
|
ba,a,pt %xcc, user_rtt_fill_fixup_mna; \
|
2008-06-20 01:26:19 +07:00
|
|
|
ba,a,pt %xcc, user_rtt_fill_fixup;
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/* Normal 32bit fill */
|
|
|
|
|
#define FILL_2_GENERIC(ASI) \
|
sparc64: Make montmul/montsqr/mpmul usable in 32-bit threads.
The Montgomery Multiply, Montgomery Square, and Multiple-Precision
Multiply instructions work by loading a combination of the floating
point and multiple register windows worth of integer registers
with the inputs.
These values are 64-bit. But for 32-bit userland processes we only
save the low 32-bits of each integer register during a register spill.
This is because the register window save area is in the user stack and
has a fixed layout.
Therefore, the only way to use these instruction in 32-bit mode is to
perform the following sequence:
1) Load the top-32bits of a choosen integer register with a sentinel,
say "-1". This will be in the outer-most register window.
The idea is that we're trying to see if the outer-most register
window gets spilled, and thus the 64-bit values were truncated.
2) Load all the inputs for the montmul/montsqr/mpmul instruction,
down to the inner-most register window.
3) Execute the opcode.
4) Traverse back up to the outer-most register window.
5) Check the sentinel, if it's still "-1" store the results.
Otherwise retry the entire sequence.
This retry is extremely troublesome. If you're just unlucky and an
interrupt or other trap happens, it'll push that outer-most window to
the stack and clear the sentinel when we restore it.
We could retry forever and never make forward progress if interrupts
arrive at a fast enough rate (consider perf events as one example).
So we have do limited retries and fallback to software which is
extremely non-deterministic.
Luckily it's very straightforward to provide a mechanism to let
32-bit applications use a 64-bit stack. Stacks in 64-bit mode are
biased by 2047 bytes, which means that the lowest bit is set in the
actual %sp register value.
So if we see bit zero set in a 32-bit application's stack we treat
it like a 64-bit stack.
Runtime detection of such a facility is tricky, and cumbersome at
best. For example, just trying to use a biased stack and seeing if it
works is hard to recover from (the signal handler will need to use an
alt stack, plus something along the lines of longjmp). Therefore, we
add a system call to report a bitmask of arch specific features like
this in a cheap and less hairy way.
With help from Andy Polyakov.
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-10-27 05:18:37 +07:00
|
|
|
and %sp, 1, %g3; \
|
|
|
|
|
brnz,pn %g3, (. - (128 + 4)); \
|
|
|
|
|
srl %sp, 0, %sp; \
|
2008-06-20 01:26:19 +07:00
|
|
|
lduwa [%sp + %g0] ASI, %l0; \
|
|
|
|
|
mov 0x04, %g2; \
|
|
|
|
|
mov 0x08, %g3; \
|
|
|
|
|
lduwa [%sp + %g2] ASI, %l1; \
|
|
|
|
|
mov 0x0c, %g5; \
|
|
|
|
|
lduwa [%sp + %g3] ASI, %l2; \
|
|
|
|
|
lduwa [%sp + %g5] ASI, %l3; \
|
|
|
|
|
add %sp, 0x10, %g1; \
|
|
|
|
|
lduwa [%g1 + %g0] ASI, %l4; \
|
|
|
|
|
lduwa [%g1 + %g2] ASI, %l5; \
|
|
|
|
|
lduwa [%g1 + %g3] ASI, %l6; \
|
|
|
|
|
lduwa [%g1 + %g5] ASI, %l7; \
|
|
|
|
|
add %g1, 0x10, %g1; \
|
|
|
|
|
lduwa [%g1 + %g0] ASI, %i0; \
|
|
|
|
|
lduwa [%g1 + %g2] ASI, %i1; \
|
|
|
|
|
lduwa [%g1 + %g3] ASI, %i2; \
|
|
|
|
|
lduwa [%g1 + %g5] ASI, %i3; \
|
|
|
|
|
add %g1, 0x10, %g1; \
|
|
|
|
|
lduwa [%g1 + %g0] ASI, %i4; \
|
|
|
|
|
lduwa [%g1 + %g2] ASI, %i5; \
|
|
|
|
|
lduwa [%g1 + %g3] ASI, %i6; \
|
|
|
|
|
lduwa [%g1 + %g5] ASI, %i7; \
|
|
|
|
|
restored; \
|
sparc64: Make montmul/montsqr/mpmul usable in 32-bit threads.
The Montgomery Multiply, Montgomery Square, and Multiple-Precision
Multiply instructions work by loading a combination of the floating
point and multiple register windows worth of integer registers
with the inputs.
These values are 64-bit. But for 32-bit userland processes we only
save the low 32-bits of each integer register during a register spill.
This is because the register window save area is in the user stack and
has a fixed layout.
Therefore, the only way to use these instruction in 32-bit mode is to
perform the following sequence:
1) Load the top-32bits of a choosen integer register with a sentinel,
say "-1". This will be in the outer-most register window.
The idea is that we're trying to see if the outer-most register
window gets spilled, and thus the 64-bit values were truncated.
2) Load all the inputs for the montmul/montsqr/mpmul instruction,
down to the inner-most register window.
3) Execute the opcode.
4) Traverse back up to the outer-most register window.
5) Check the sentinel, if it's still "-1" store the results.
Otherwise retry the entire sequence.
This retry is extremely troublesome. If you're just unlucky and an
interrupt or other trap happens, it'll push that outer-most window to
the stack and clear the sentinel when we restore it.
We could retry forever and never make forward progress if interrupts
arrive at a fast enough rate (consider perf events as one example).
So we have do limited retries and fallback to software which is
extremely non-deterministic.
Luckily it's very straightforward to provide a mechanism to let
32-bit applications use a 64-bit stack. Stacks in 64-bit mode are
biased by 2047 bytes, which means that the lowest bit is set in the
actual %sp register value.
So if we see bit zero set in a 32-bit application's stack we treat
it like a 64-bit stack.
Runtime detection of such a facility is tricky, and cumbersome at
best. For example, just trying to use a biased stack and seeing if it
works is hard to recover from (the signal handler will need to use an
alt stack, plus something along the lines of longjmp). Therefore, we
add a system call to report a bitmask of arch specific features like
this in a cheap and less hairy way.
With help from Andy Polyakov.
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-10-27 05:18:37 +07:00
|
|
|
retry; nop; nop; \
|
2008-06-20 01:26:19 +07:00
|
|
|
b,a,pt %xcc, fill_fixup_dax; \
|
|
|
|
|
b,a,pt %xcc, fill_fixup_mna; \
|
|
|
|
|
b,a,pt %xcc, fill_fixup;
|
|
|
|
|
|
|
|
|
|
#define FILL_2_GENERIC_RTRAP \
|
|
|
|
|
user_rtt_fill_32bit: \
|
sparc64: Make montmul/montsqr/mpmul usable in 32-bit threads.
The Montgomery Multiply, Montgomery Square, and Multiple-Precision
Multiply instructions work by loading a combination of the floating
point and multiple register windows worth of integer registers
with the inputs.
These values are 64-bit. But for 32-bit userland processes we only
save the low 32-bits of each integer register during a register spill.
This is because the register window save area is in the user stack and
has a fixed layout.
Therefore, the only way to use these instruction in 32-bit mode is to
perform the following sequence:
1) Load the top-32bits of a choosen integer register with a sentinel,
say "-1". This will be in the outer-most register window.
The idea is that we're trying to see if the outer-most register
window gets spilled, and thus the 64-bit values were truncated.
2) Load all the inputs for the montmul/montsqr/mpmul instruction,
down to the inner-most register window.
3) Execute the opcode.
4) Traverse back up to the outer-most register window.
5) Check the sentinel, if it's still "-1" store the results.
Otherwise retry the entire sequence.
This retry is extremely troublesome. If you're just unlucky and an
interrupt or other trap happens, it'll push that outer-most window to
the stack and clear the sentinel when we restore it.
We could retry forever and never make forward progress if interrupts
arrive at a fast enough rate (consider perf events as one example).
So we have do limited retries and fallback to software which is
extremely non-deterministic.
Luckily it's very straightforward to provide a mechanism to let
32-bit applications use a 64-bit stack. Stacks in 64-bit mode are
biased by 2047 bytes, which means that the lowest bit is set in the
actual %sp register value.
So if we see bit zero set in a 32-bit application's stack we treat
it like a 64-bit stack.
Runtime detection of such a facility is tricky, and cumbersome at
best. For example, just trying to use a biased stack and seeing if it
works is hard to recover from (the signal handler will need to use an
alt stack, plus something along the lines of longjmp). Therefore, we
add a system call to report a bitmask of arch specific features like
this in a cheap and less hairy way.
With help from Andy Polyakov.
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-10-27 05:18:37 +07:00
|
|
|
and %sp, 1, %g3; \
|
|
|
|
|
brnz,pn %g3, user_rtt_fill_64bit; \
|
|
|
|
|
srl %sp, 0, %sp; \
|
2008-06-20 01:26:19 +07:00
|
|
|
lduwa [%sp + 0x00] %asi, %l0; \
|
|
|
|
|
lduwa [%sp + 0x04] %asi, %l1; \
|
|
|
|
|
lduwa [%sp + 0x08] %asi, %l2; \
|
|
|
|
|
lduwa [%sp + 0x0c] %asi, %l3; \
|
|
|
|
|
lduwa [%sp + 0x10] %asi, %l4; \
|
|
|
|
|
lduwa [%sp + 0x14] %asi, %l5; \
|
|
|
|
|
lduwa [%sp + 0x18] %asi, %l6; \
|
|
|
|
|
lduwa [%sp + 0x1c] %asi, %l7; \
|
|
|
|
|
lduwa [%sp + 0x20] %asi, %i0; \
|
|
|
|
|
lduwa [%sp + 0x24] %asi, %i1; \
|
|
|
|
|
lduwa [%sp + 0x28] %asi, %i2; \
|
|
|
|
|
lduwa [%sp + 0x2c] %asi, %i3; \
|
|
|
|
|
lduwa [%sp + 0x30] %asi, %i4; \
|
|
|
|
|
lduwa [%sp + 0x34] %asi, %i5; \
|
|
|
|
|
lduwa [%sp + 0x38] %asi, %i6; \
|
|
|
|
|
lduwa [%sp + 0x3c] %asi, %i7; \
|
|
|
|
|
ba,pt %xcc, user_rtt_pre_restore; \
|
|
|
|
|
restored; \
|
|
|
|
|
nop; nop; nop; nop; nop; \
|
sparc64: Make montmul/montsqr/mpmul usable in 32-bit threads.
The Montgomery Multiply, Montgomery Square, and Multiple-Precision
Multiply instructions work by loading a combination of the floating
point and multiple register windows worth of integer registers
with the inputs.
These values are 64-bit. But for 32-bit userland processes we only
save the low 32-bits of each integer register during a register spill.
This is because the register window save area is in the user stack and
has a fixed layout.
Therefore, the only way to use these instruction in 32-bit mode is to
perform the following sequence:
1) Load the top-32bits of a choosen integer register with a sentinel,
say "-1". This will be in the outer-most register window.
The idea is that we're trying to see if the outer-most register
window gets spilled, and thus the 64-bit values were truncated.
2) Load all the inputs for the montmul/montsqr/mpmul instruction,
down to the inner-most register window.
3) Execute the opcode.
4) Traverse back up to the outer-most register window.
5) Check the sentinel, if it's still "-1" store the results.
Otherwise retry the entire sequence.
This retry is extremely troublesome. If you're just unlucky and an
interrupt or other trap happens, it'll push that outer-most window to
the stack and clear the sentinel when we restore it.
We could retry forever and never make forward progress if interrupts
arrive at a fast enough rate (consider perf events as one example).
So we have do limited retries and fallback to software which is
extremely non-deterministic.
Luckily it's very straightforward to provide a mechanism to let
32-bit applications use a 64-bit stack. Stacks in 64-bit mode are
biased by 2047 bytes, which means that the lowest bit is set in the
actual %sp register value.
So if we see bit zero set in a 32-bit application's stack we treat
it like a 64-bit stack.
Runtime detection of such a facility is tricky, and cumbersome at
best. For example, just trying to use a biased stack and seeing if it
works is hard to recover from (the signal handler will need to use an
alt stack, plus something along the lines of longjmp). Therefore, we
add a system call to report a bitmask of arch specific features like
this in a cheap and less hairy way.
With help from Andy Polyakov.
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-10-27 05:18:37 +07:00
|
|
|
nop; nop; nop; \
|
sparc64: Fix return from trap window fill crashes.
We must handle data access exception as well as memory address unaligned
exceptions from return from trap window fill faults, not just normal
TLB misses.
Otherwise we can get an OOPS that looks like this:
ld-linux.so.2(36808): Kernel bad sw trap 5 [#1]
CPU: 1 PID: 36808 Comm: ld-linux.so.2 Not tainted 4.6.0 #34
task: fff8000303be5c60 ti: fff8000301344000 task.ti: fff8000301344000
TSTATE: 0000004410001601 TPC: 0000000000a1a784 TNPC: 0000000000a1a788 Y: 00000002 Not tainted
TPC: <do_sparc64_fault+0x5c4/0x700>
g0: fff8000024fc8248 g1: 0000000000db04dc g2: 0000000000000000 g3: 0000000000000001
g4: fff8000303be5c60 g5: fff800030e672000 g6: fff8000301344000 g7: 0000000000000001
o0: 0000000000b95ee8 o1: 000000000000012b o2: 0000000000000000 o3: 0000000200b9b358
o4: 0000000000000000 o5: fff8000301344040 sp: fff80003013475c1 ret_pc: 0000000000a1a77c
RPC: <do_sparc64_fault+0x5bc/0x700>
l0: 00000000000007ff l1: 0000000000000000 l2: 000000000000005f l3: 0000000000000000
l4: fff8000301347e98 l5: fff8000024ff3060 l6: 0000000000000000 l7: 0000000000000000
i0: fff8000301347f60 i1: 0000000000102400 i2: 0000000000000000 i3: 0000000000000000
i4: 0000000000000000 i5: 0000000000000000 i6: fff80003013476a1 i7: 0000000000404d4c
I7: <user_rtt_fill_fixup+0x6c/0x7c>
Call Trace:
[0000000000404d4c] user_rtt_fill_fixup+0x6c/0x7c
The window trap handlers are slightly clever, the trap table entries for them are
composed of two pieces of code. First comes the code that actually performs
the window fill or spill trap handling, and then there are three instructions at
the end which are for exception processing.
The userland register window fill handler is:
add %sp, STACK_BIAS + 0x00, %g1; \
ldxa [%g1 + %g0] ASI, %l0; \
mov 0x08, %g2; \
mov 0x10, %g3; \
ldxa [%g1 + %g2] ASI, %l1; \
mov 0x18, %g5; \
ldxa [%g1 + %g3] ASI, %l2; \
ldxa [%g1 + %g5] ASI, %l3; \
add %g1, 0x20, %g1; \
ldxa [%g1 + %g0] ASI, %l4; \
ldxa [%g1 + %g2] ASI, %l5; \
ldxa [%g1 + %g3] ASI, %l6; \
ldxa [%g1 + %g5] ASI, %l7; \
add %g1, 0x20, %g1; \
ldxa [%g1 + %g0] ASI, %i0; \
ldxa [%g1 + %g2] ASI, %i1; \
ldxa [%g1 + %g3] ASI, %i2; \
ldxa [%g1 + %g5] ASI, %i3; \
add %g1, 0x20, %g1; \
ldxa [%g1 + %g0] ASI, %i4; \
ldxa [%g1 + %g2] ASI, %i5; \
ldxa [%g1 + %g3] ASI, %i6; \
ldxa [%g1 + %g5] ASI, %i7; \
restored; \
retry; nop; nop; nop; nop; \
b,a,pt %xcc, fill_fixup_dax; \
b,a,pt %xcc, fill_fixup_mna; \
b,a,pt %xcc, fill_fixup;
And the way this works is that if any of those memory accesses
generate an exception, the exception handler can revector to one of
those final three branch instructions depending upon which kind of
exception the memory access took. In this way, the fault handler
doesn't have to know if it was a spill or a fill that it's handling
the fault for. It just always branches to the last instruction in
the parent trap's handler.
For example, for a regular fault, the code goes:
winfix_trampoline:
rdpr %tpc, %g3
or %g3, 0x7c, %g3
wrpr %g3, %tnpc
done
All window trap handlers are 0x80 aligned, so if we "or" 0x7c into the
trap time program counter, we'll get that final instruction in the
trap handler.
On return from trap, we have to pull the register window in but we do
this by hand instead of just executing a "restore" instruction for
several reasons. The largest being that from Niagara and onward we
simply don't have enough levels in the trap stack to fully resolve all
possible exception cases of a window fault when we are already at
trap level 1 (which we enter to get ready to return from the original
trap).
This is executed inline via the FILL_*_RTRAP handlers. rtrap_64.S's
code branches directly to these to do the window fill by hand if
necessary. Now if you look at them, we'll see at the end:
ba,a,pt %xcc, user_rtt_fill_fixup;
ba,a,pt %xcc, user_rtt_fill_fixup;
ba,a,pt %xcc, user_rtt_fill_fixup;
And oops, all three cases are handled like a fault.
This doesn't work because each of these trap types (data access
exception, memory address unaligned, and faults) store their auxiliary
info in different registers to pass on to the C handler which does the
real work.
So in the case where the stack was unaligned, the unaligned trap
handler sets up the arg registers one way, and then we branched to
the fault handler which expects them setup another way.
So the FAULT_TYPE_* value ends up basically being garbage, and
randomly would generate the backtrace seen above.
Reported-by: Nick Alcock <nix@esperi.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
2016-05-29 10:41:12 +07:00
|
|
|
ba,a,pt %xcc, user_rtt_fill_fixup_dax; \
|
|
|
|
|
ba,a,pt %xcc, user_rtt_fill_fixup_mna; \
|
2008-06-20 01:26:19 +07:00
|
|
|
ba,a,pt %xcc, user_rtt_fill_fixup;
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
#define FILL_1_NORMAL FILL_1_GENERIC(ASI_AIUP)
|
|
|
|
|
#define FILL_2_NORMAL FILL_2_GENERIC(ASI_AIUP)
|
|
|
|
|
#define FILL_3_NORMAL FILL_0_NORMAL
|
|
|
|
|
#define FILL_4_NORMAL FILL_0_NORMAL
|
|
|
|
|
#define FILL_5_NORMAL FILL_0_NORMAL
|
|
|
|
|
#define FILL_6_NORMAL FILL_0_NORMAL
|
|
|
|
|
#define FILL_7_NORMAL FILL_0_NORMAL
|
|
|
|
|
|
|
|
|
|
#define FILL_0_OTHER FILL_0_NORMAL
|
|
|
|
|
#define FILL_1_OTHER FILL_1_GENERIC(ASI_AIUS)
|
|
|
|
|
#define FILL_2_OTHER FILL_2_GENERIC(ASI_AIUS)
|
|
|
|
|
#define FILL_3_OTHER FILL_3_NORMAL
|
|
|
|
|
#define FILL_4_OTHER FILL_4_NORMAL
|
|
|
|
|
#define FILL_5_OTHER FILL_5_NORMAL
|
|
|
|
|
#define FILL_6_OTHER FILL_6_NORMAL
|
|
|
|
|
#define FILL_7_OTHER FILL_7_NORMAL
|
|
|
|
|
|
|
|
|
|
#endif /* !(_SPARC64_TTABLE_H) */
|