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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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[PATCH] i386: Use asm-offsets for the offsets of registers into the pt_regs struct
Use asm-offsets for the offsets of registers into the pt_regs struct, rather than having hard-coded constants I left the constants in the comments of entry.S because they're useful for reference; the code in entry.S is very dependent on the layout of pt_regs, even when using asm-offsets. Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com> Signed-off-by: Andi Kleen <ak@suse.de> Cc: Keith Owens <kaos@ocs.com.au> Signed-off-by: Andrew Morton <akpm@osdl.org>
This commit is contained in:
Jeremy Fitzhardinge
Andi Kleen
parent
bcddc0155f
commit
eb5b7b9d86
@ -63,6 +63,23 @@ void foo(void)
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OFFSET(GDS_pad, Xgt_desc_struct, pad);
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BLANK();
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OFFSET(PT_EBX, pt_regs, ebx);
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OFFSET(PT_ECX, pt_regs, ecx);
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OFFSET(PT_EDX, pt_regs, edx);
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OFFSET(PT_ESI, pt_regs, esi);
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OFFSET(PT_EDI, pt_regs, edi);
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OFFSET(PT_EBP, pt_regs, ebp);
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OFFSET(PT_EAX, pt_regs, eax);
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OFFSET(PT_DS, pt_regs, xds);
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OFFSET(PT_ES, pt_regs, xes);
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OFFSET(PT_ORIG_EAX, pt_regs, orig_eax);
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OFFSET(PT_EIP, pt_regs, eip);
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OFFSET(PT_CS, pt_regs, xcs);
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OFFSET(PT_EFLAGS, pt_regs, eflags);
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OFFSET(PT_OLDESP, pt_regs, esp);
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OFFSET(PT_OLDSS, pt_regs, xss);
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BLANK();
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OFFSET(EXEC_DOMAIN_handler, exec_domain, handler);
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OFFSET(RT_SIGFRAME_sigcontext, rt_sigframe, uc.uc_mcontext);
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BLANK();
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@ -54,22 +54,6 @@
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#define nr_syscalls ((syscall_table_size)/4)
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EBX = 0x00
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ECX = 0x04
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EDX = 0x08
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ESI = 0x0C
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EDI = 0x10
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EBP = 0x14
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EAX = 0x18
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DS = 0x1C
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ES = 0x20
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ORIG_EAX = 0x24
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EIP = 0x28
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CS = 0x2C
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EFLAGS = 0x30
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OLDESP = 0x34
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OLDSS = 0x38
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CF_MASK = 0x00000001
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TF_MASK = 0x00000100
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IF_MASK = 0x00000200
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@ -93,7 +77,7 @@ VM_MASK = 0x00020000
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.macro TRACE_IRQS_IRET
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#ifdef CONFIG_TRACE_IRQFLAGS
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testl $IF_MASK,EFLAGS(%esp) # interrupts off?
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testl $IF_MASK,PT_EFLAGS(%esp) # interrupts off?
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jz 1f
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TRACE_IRQS_ON
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1:
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@ -199,18 +183,18 @@ VM_MASK = 0x00020000
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#define RING0_PTREGS_FRAME \
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CFI_STARTPROC simple;\
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CFI_SIGNAL_FRAME;\
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CFI_DEF_CFA esp, OLDESP-EBX;\
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/*CFI_OFFSET cs, CS-OLDESP;*/\
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CFI_OFFSET eip, EIP-OLDESP;\
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/*CFI_OFFSET es, ES-OLDESP;*/\
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/*CFI_OFFSET ds, DS-OLDESP;*/\
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CFI_OFFSET eax, EAX-OLDESP;\
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CFI_OFFSET ebp, EBP-OLDESP;\
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CFI_OFFSET edi, EDI-OLDESP;\
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CFI_OFFSET esi, ESI-OLDESP;\
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CFI_OFFSET edx, EDX-OLDESP;\
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CFI_OFFSET ecx, ECX-OLDESP;\
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CFI_OFFSET ebx, EBX-OLDESP
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CFI_DEF_CFA esp, PT_OLDESP-PT_EBX;\
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/*CFI_OFFSET cs, PT_CS-PT_OLDESP;*/\
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CFI_OFFSET eip, PT_EIP-PT_OLDESP;\
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/*CFI_OFFSET es, PT_ES-PT_OLDESP;*/\
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/*CFI_OFFSET ds, PT_DS-PT_OLDESP;*/\
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CFI_OFFSET eax, PT_EAX-PT_OLDESP;\
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CFI_OFFSET ebp, PT_EBP-PT_OLDESP;\
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CFI_OFFSET edi, PT_EDI-PT_OLDESP;\
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CFI_OFFSET esi, PT_ESI-PT_OLDESP;\
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CFI_OFFSET edx, PT_EDX-PT_OLDESP;\
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CFI_OFFSET ecx, PT_ECX-PT_OLDESP;\
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CFI_OFFSET ebx, PT_EBX-PT_OLDESP
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ENTRY(ret_from_fork)
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CFI_STARTPROC
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@ -242,8 +226,8 @@ ret_from_exception:
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ret_from_intr:
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GET_THREAD_INFO(%ebp)
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check_userspace:
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movl EFLAGS(%esp), %eax # mix EFLAGS and CS
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movb CS(%esp), %al
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movl PT_EFLAGS(%esp), %eax # mix EFLAGS and CS
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movb PT_CS(%esp), %al
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andl $(VM_MASK | SEGMENT_RPL_MASK), %eax
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cmpl $USER_RPL, %eax
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jb resume_kernel # not returning to v8086 or userspace
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@ -266,7 +250,7 @@ need_resched:
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movl TI_flags(%ebp), %ecx # need_resched set ?
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testb $_TIF_NEED_RESCHED, %cl
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jz restore_all
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testl $IF_MASK,EFLAGS(%esp) # interrupts off (exception path) ?
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testl $IF_MASK,PT_EFLAGS(%esp) # interrupts off (exception path) ?
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jz restore_all
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call preempt_schedule_irq
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jmp need_resched
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@ -332,15 +316,15 @@ sysenter_past_esp:
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cmpl $(nr_syscalls), %eax
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jae syscall_badsys
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call *sys_call_table(,%eax,4)
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movl %eax,EAX(%esp)
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movl %eax,PT_EAX(%esp)
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DISABLE_INTERRUPTS
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TRACE_IRQS_OFF
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movl TI_flags(%ebp), %ecx
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testw $_TIF_ALLWORK_MASK, %cx
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jne syscall_exit_work
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/* if something modifies registers it must also disable sysexit */
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movl EIP(%esp), %edx
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movl OLDESP(%esp), %ecx
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movl PT_EIP(%esp), %edx
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movl PT_OLDESP(%esp), %ecx
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xorl %ebp,%ebp
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TRACE_IRQS_ON
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ENABLE_INTERRUPTS_SYSEXIT
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@ -354,7 +338,7 @@ ENTRY(system_call)
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CFI_ADJUST_CFA_OFFSET 4
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SAVE_ALL
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GET_THREAD_INFO(%ebp)
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testl $TF_MASK,EFLAGS(%esp)
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testl $TF_MASK,PT_EFLAGS(%esp)
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jz no_singlestep
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orl $_TIF_SINGLESTEP,TI_flags(%ebp)
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no_singlestep:
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@ -366,7 +350,7 @@ no_singlestep:
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jae syscall_badsys
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syscall_call:
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call *sys_call_table(,%eax,4)
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movl %eax,EAX(%esp) # store the return value
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movl %eax,PT_EAX(%esp) # store the return value
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syscall_exit:
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DISABLE_INTERRUPTS # make sure we don't miss an interrupt
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# setting need_resched or sigpending
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@ -377,12 +361,12 @@ syscall_exit:
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jne syscall_exit_work
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restore_all:
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movl EFLAGS(%esp), %eax # mix EFLAGS, SS and CS
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# Warning: OLDSS(%esp) contains the wrong/random values if we
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movl PT_EFLAGS(%esp), %eax # mix EFLAGS, SS and CS
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# Warning: PT_OLDSS(%esp) contains the wrong/random values if we
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# are returning to the kernel.
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# See comments in process.c:copy_thread() for details.
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movb OLDSS(%esp), %ah
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movb CS(%esp), %al
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movb PT_OLDSS(%esp), %ah
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movb PT_CS(%esp), %al
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andl $(VM_MASK | (SEGMENT_TI_MASK << 8) | SEGMENT_RPL_MASK), %eax
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cmpl $((SEGMENT_LDT << 8) | USER_RPL), %eax
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CFI_REMEMBER_STATE
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@ -409,7 +393,7 @@ iret_exc:
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CFI_RESTORE_STATE
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ldt_ss:
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larl OLDSS(%esp), %eax
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larl PT_OLDSS(%esp), %eax
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jnz restore_nocheck
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testl $0x00400000, %eax # returning to 32bit stack?
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jnz restore_nocheck # allright, normal return
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@ -419,7 +403,7 @@ ldt_ss:
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* This is an "official" bug of all the x86-compatible
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* CPUs, which we can try to work around to make
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* dosemu and wine happy. */
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movl OLDESP(%esp), %eax
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movl PT_OLDESP(%esp), %eax
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movl %esp, %edx
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call patch_espfix_desc
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pushl $__ESPFIX_SS
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@ -454,7 +438,7 @@ work_resched:
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work_notifysig: # deal with pending signals and
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# notify-resume requests
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testl $VM_MASK, EFLAGS(%esp)
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testl $VM_MASK, PT_EFLAGS(%esp)
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movl %esp, %eax
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jne work_notifysig_v86 # returning to kernel-space or
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# vm86-space
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@ -479,14 +463,14 @@ work_notifysig_v86:
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# perform syscall exit tracing
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ALIGN
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syscall_trace_entry:
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movl $-ENOSYS,EAX(%esp)
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movl $-ENOSYS,PT_EAX(%esp)
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movl %esp, %eax
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xorl %edx,%edx
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call do_syscall_trace
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cmpl $0, %eax
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jne resume_userspace # ret != 0 -> running under PTRACE_SYSEMU,
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# so must skip actual syscall
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movl ORIG_EAX(%esp), %eax
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movl PT_ORIG_EAX(%esp), %eax
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cmpl $(nr_syscalls), %eax
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jnae syscall_call
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jmp syscall_exit
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@ -511,11 +495,11 @@ syscall_fault:
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CFI_ADJUST_CFA_OFFSET 4
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SAVE_ALL
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GET_THREAD_INFO(%ebp)
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movl $-EFAULT,EAX(%esp)
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movl $-EFAULT,PT_EAX(%esp)
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jmp resume_userspace
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syscall_badsys:
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movl $-ENOSYS,EAX(%esp)
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movl $-ENOSYS,PT_EAX(%esp)
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jmp resume_userspace
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CFI_ENDPROC
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@ -636,10 +620,10 @@ error_code:
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popl %ecx
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CFI_ADJUST_CFA_OFFSET -4
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/*CFI_REGISTER es, ecx*/
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movl ES(%esp), %edi # get the function address
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movl ORIG_EAX(%esp), %edx # get the error code
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movl $-1, ORIG_EAX(%esp)
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movl %ecx, ES(%esp)
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movl PT_ES(%esp), %edi # get the function address
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movl PT_ORIG_EAX(%esp), %edx # get the error code
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movl $-1, PT_ORIG_EAX(%esp)
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movl %ecx, PT_ES(%esp)
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/*CFI_REL_OFFSET es, ES*/
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movl $(__USER_DS), %ecx
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movl %ecx, %ds
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@ -942,26 +926,26 @@ ENTRY(arch_unwind_init_running)
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movl 4(%esp), %edx
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movl (%esp), %ecx
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leal 4(%esp), %eax
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movl %ebx, EBX(%edx)
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movl %ebx, PT_EBX(%edx)
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xorl %ebx, %ebx
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movl %ebx, ECX(%edx)
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movl %ebx, EDX(%edx)
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movl %esi, ESI(%edx)
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movl %edi, EDI(%edx)
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movl %ebp, EBP(%edx)
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movl %ebx, EAX(%edx)
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movl $__USER_DS, DS(%edx)
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movl $__USER_DS, ES(%edx)
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movl %ebx, ORIG_EAX(%edx)
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movl %ecx, EIP(%edx)
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movl %ebx, PT_ECX(%edx)
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movl %ebx, PT_EDX(%edx)
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movl %esi, PT_ESI(%edx)
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movl %edi, PT_EDI(%edx)
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movl %ebp, PT_EBP(%edx)
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movl %ebx, PT_EAX(%edx)
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movl $__USER_DS, PT_DS(%edx)
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movl $__USER_DS, PT_ES(%edx)
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movl %ebx, PT_ORIG_EAX(%edx)
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movl %ecx, PT_EIP(%edx)
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movl 12(%esp), %ecx
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movl $__KERNEL_CS, CS(%edx)
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movl %ebx, EFLAGS(%edx)
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movl %eax, OLDESP(%edx)
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movl $__KERNEL_CS, PT_CS(%edx)
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movl %ebx, PT_EFLAGS(%edx)
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movl %eax, PT_OLDESP(%edx)
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movl 8(%esp), %eax
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movl %ecx, 8(%esp)
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movl EBX(%edx), %ebx
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movl $__KERNEL_DS, OLDSS(%edx)
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movl PT_EBX(%edx), %ebx
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movl $__KERNEL_DS, PT_OLDSS(%edx)
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jmpl *%eax
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CFI_ENDPROC
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ENDPROC(arch_unwind_init_running)
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