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Redo RM9000 workaround which along with other DSP ASE changes was

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causing some headache for debuggers knowing about signal frames.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Ralf Baechle 2005-06-15 13:00:12 +00:00
parent aac8aa7717
commit 02416dcf5a
9 changed files with 99 additions and 87 deletions
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36
arch/mips/kernel/signal-common.h
View File

@ -160,7 +160,7 @@ restore_sigcontext(struct pt_regs *regs, struct sigcontext *sc)
static inline void *
get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size)
{
unsigned long sp, almask;
unsigned long sp;
/* Default to using normal stack */
sp = regs->regs[29];
@ -176,10 +176,32 @@ get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size)
if ((ka->sa.sa_flags & SA_ONSTACK) && (sas_ss_flags (sp) == 0))
sp = current->sas_ss_sp + current->sas_ss_size;
if (PLAT_TRAMPOLINE_STUFF_LINE)
almask = ~(PLAT_TRAMPOLINE_STUFF_LINE - 1);
else
almask = ALMASK;
return (void *)((sp - frame_size) & almask);
return (void *)((sp - frame_size) & (ICACHE_REFILLS_WORKAROUND_WAR ? 32 : ALMASK));
}
static inline int install_sigtramp(unsigned int __user *tramp,
unsigned int syscall)
{
int err;
/*
* Set up the return code ...
*
* li v0, __NR__foo_sigreturn
* syscall
*/
err = __put_user(0x24020000 + syscall, tramp + 0);
err |= __put_user(0x0000000c , tramp + 1);
if (ICACHE_REFILLS_WORKAROUND_WAR) {
err |= __put_user(0, tramp + 2);
err |= __put_user(0, tramp + 3);
err |= __put_user(0, tramp + 4);
err |= __put_user(0, tramp + 5);
err |= __put_user(0, tramp + 6);
err |= __put_user(0, tramp + 7);
}
flush_cache_sigtramp((unsigned long) tramp);
return err;
}

59
arch/mips/kernel/signal.c
View File

@ -8,6 +8,7 @@
* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
*/
#include <linux/config.h>
#include <linux/cache.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/personality.h>
@ -30,6 +31,7 @@
#include <asm/uaccess.h>
#include <asm/ucontext.h>
#include <asm/cpu-features.h>
#include <asm/war.h>
#include "signal-common.h"
@ -157,26 +159,39 @@ asmlinkage int sys_sigaltstack(nabi_no_regargs struct pt_regs regs)
return do_sigaltstack(uss, uoss, usp);
}
#if PLAT_TRAMPOLINE_STUFF_LINE
#define __tramp __attribute__((aligned(PLAT_TRAMPOLINE_STUFF_LINE)))
#else
#define __tramp
#endif
/*
* Horribly complicated - with the bloody RM9000 workarounds enabled
* the signal trampolines is moving to the end of the structure so we can
* increase the alignment without breaking software compatibility.
*/
#ifdef CONFIG_TRAD_SIGNALS
struct sigframe {
u32 sf_ass[4]; /* argument save space for o32 */
u32 sf_code[2] __tramp; /* signal trampoline */
struct sigcontext sf_sc __tramp;
#if ICACHE_REFILLS_WORKAROUND_WAR
u32 sf_pad[2];
#else
u32 sf_code[2]; /* signal trampoline */
#endif
struct sigcontext sf_sc;
sigset_t sf_mask;
#if ICACHE_REFILLS_WORKAROUND_WAR
u32 sf_code[8] ____cacheline_aligned; /* signal trampoline */
#endif
};
#endif
struct rt_sigframe {
u32 rs_ass[4]; /* argument save space for o32 */
u32 rs_code[2] __tramp; /* signal trampoline */
struct siginfo rs_info __tramp;
#if ICACHE_REFILLS_WORKAROUND_WAR
u32 rs_pad[2];
#else
u32 rs_code[2]; /* signal trampoline */
#endif
struct siginfo rs_info;
struct ucontext rs_uc;
#if ICACHE_REFILLS_WORKAROUND_WAR
u32 rs_code[8] ____cacheline_aligned; /* signal trampoline */
#endif
};
#ifdef CONFIG_TRAD_SIGNALS
@ -273,17 +288,7 @@ void setup_frame(struct k_sigaction * ka, struct pt_regs *regs,
if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
goto give_sigsegv;
/*
* Set up the return code ...
*
* li v0, __NR_sigreturn
* syscall
*/
if (PLAT_TRAMPOLINE_STUFF_LINE)
__clear_user(frame->sf_code, PLAT_TRAMPOLINE_STUFF_LINE);
err |= __put_user(0x24020000 + __NR_sigreturn, frame->sf_code + 0);
err |= __put_user(0x0000000c , frame->sf_code + 1);
flush_cache_sigtramp((unsigned long) frame->sf_code);
install_sigtramp(frame->sf_code, __NR_sigreturn);
err |= setup_sigcontext(regs, &frame->sf_sc);
err |= __copy_to_user(&frame->sf_mask, set, sizeof(*set));
@ -329,17 +334,7 @@ void setup_rt_frame(struct k_sigaction * ka, struct pt_regs *regs,
if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
goto give_sigsegv;
/*
* Set up the return code ...
*
* li v0, __NR_rt_sigreturn
* syscall
*/
if (PLAT_TRAMPOLINE_STUFF_LINE)
__clear_user(frame->rs_code, PLAT_TRAMPOLINE_STUFF_LINE);
err |= __put_user(0x24020000 + __NR_rt_sigreturn, frame->rs_code + 0);
err |= __put_user(0x0000000c , frame->rs_code + 1);
flush_cache_sigtramp((unsigned long) frame->rs_code);
install_sigtramp(frame->rs_code, __NR_rt_sigreturn);
/* Create siginfo. */
err |= copy_siginfo_to_user(&frame->rs_info, info);

16
arch/mips/kernel/signal32.c
View File

@ -7,6 +7,7 @@
* Copyright (C) 1994 - 2000 Ralf Baechle
* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
*/
#include <linux/cache.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/smp.h>
@ -30,6 +31,7 @@
#include <asm/ucontext.h>
#include <asm/system.h>
#include <asm/fpu.h>
#include <asm/war.h>
#define SI_PAD_SIZE32 ((SI_MAX_SIZE/sizeof(int)) - 3)
@ -392,16 +394,30 @@ static int restore_sigcontext32(struct pt_regs *regs, struct sigcontext32 *sc)
struct sigframe {
u32 sf_ass[4]; /* argument save space for o32 */
#if ICACHE_REFILLS_WORKAROUND_WAR
u32 sf_pad[2];
#else
u32 sf_code[2]; /* signal trampoline */
#endif
struct sigcontext32 sf_sc;
sigset_t sf_mask;
#if ICACHE_REFILLS_WORKAROUND_WAR
u32 sf_code[8] ____cacheline_aligned; /* signal trampoline */
#endif
};
struct rt_sigframe32 {
u32 rs_ass[4]; /* argument save space for o32 */
#if ICACHE_REFILLS_WORKAROUND_WAR
u32 rs_pad[2];
#else
u32 rs_code[2]; /* signal trampoline */
#endif
compat_siginfo_t rs_info;
struct ucontext32 rs_uc;
#if ICACHE_REFILLS_WORKAROUND_WAR
u32 rs_code[8] __attribute__((aligned(32))); /* signal trampoline */
#endif
};
int copy_siginfo_to_user32(compat_siginfo_t *to, siginfo_t *from)

32
arch/mips/kernel/signal_n32.c
View File

@ -15,6 +15,8 @@
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <linux/cache.h>
#include <linux/sched.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/smp.h>
@ -36,6 +38,7 @@
#include <asm/system.h>
#include <asm/fpu.h>
#include <asm/cpu-features.h>
#include <asm/war.h>
#include "signal-common.h"
@ -62,17 +65,18 @@ struct ucontextn32 {
sigset_t uc_sigmask; /* mask last for extensibility */
};
#if PLAT_TRAMPOLINE_STUFF_LINE
#define __tramp __attribute__((aligned(PLAT_TRAMPOLINE_STUFF_LINE)))
#else
#define __tramp
#endif
struct rt_sigframe_n32 {
u32 rs_ass[4]; /* argument save space for o32 */
u32 rs_code[2] __tramp; /* signal trampoline */
struct siginfo rs_info __tramp;
#if ICACHE_REFILLS_WORKAROUND_WAR
u32 rs_pad[2];
#else
u32 rs_code[2]; /* signal trampoline */
#endif
struct siginfo rs_info;
struct ucontextn32 rs_uc;
#if ICACHE_REFILLS_WORKAROUND_WAR
u32 rs_code[8] ____cacheline_aligned; /* signal trampoline */
#endif
};
save_static_function(sysn32_rt_sigreturn);
@ -137,17 +141,7 @@ void setup_rt_frame_n32(struct k_sigaction * ka,
if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
goto give_sigsegv;
/*
* Set up the return code ...
*
* li v0, __NR_rt_sigreturn
* syscall
*/
if (PLAT_TRAMPOLINE_STUFF_LINE)
__clear_user(frame->rs_code, PLAT_TRAMPOLINE_STUFF_LINE);
err |= __put_user(0x24020000 + __NR_N32_rt_sigreturn, frame->rs_code + 0);
err |= __put_user(0x0000000c , frame->rs_code + 1);
flush_cache_sigtramp((unsigned long) frame->rs_code);
install_sigtramp(frame->rs_code, __NR_N32_rt_sigreturn);
/* Create siginfo. */
err |= copy_siginfo_to_user(&frame->rs_info, info);

11
include/asm-mips/cpu-features.h
View File

@ -109,17 +109,6 @@
#define cpu_has_dsp (cpu_data[0].ases & MIPS_ASE_DSP)
#endif
/*
* Certain CPUs may throw bizarre exceptions if not the whole cacheline
* contains valid instructions. For these we ensure proper alignment of
* signal trampolines and pad them to the size of a full cache lines with
* nops. This is also used in structure definitions so can't be a test macro
* like the others.
*/
#ifndef PLAT_TRAMPOLINE_STUFF_LINE
#define PLAT_TRAMPOLINE_STUFF_LINE 0UL
#endif
#ifdef CONFIG_32BIT
# ifndef cpu_has_nofpuex
# define cpu_has_nofpuex (cpu_data[0].options & MIPS_CPU_NOFPUEX)

6
include/asm-mips/mach-ja/cpu-feature-overrides.h
View File

@ -37,10 +37,4 @@
#define cpu_icache_line_size() 32
#define cpu_scache_line_size() 32
/*
* On the RM9000 we need to ensure that I-cache lines being fetches only
* contain valid instructions are funny things will happen.
*/
#define PLAT_TRAMPOLINE_STUFF_LINE 32UL
#endif /* __ASM_MACH_JA_CPU_FEATURE_OVERRIDES_H */

6
include/asm-mips/mach-ocelot3/cpu-feature-overrides.h
View File

@ -40,10 +40,4 @@
#define cpu_icache_line_size() 32
#define cpu_scache_line_size() 32
/*
* On the RM9000 we need to ensure that I-cache lines being fetches only
* contain valid instructions are funny things will happen.
*/
#define PLAT_TRAMPOLINE_STUFF_LINE 32UL
#endif /* __ASM_MACH_JA_CPU_FEATURE_OVERRIDES_H */

6
include/asm-mips/mach-yosemite/cpu-feature-overrides.h
View File

@ -37,10 +37,4 @@
#define cpu_icache_line_size() 32
#define cpu_scache_line_size() 32
/*
* On the RM9000 we need to ensure that I-cache lines being fetches only
* contain valid instructions are funny things will happen.
*/
#define PLAT_TRAMPOLINE_STUFF_LINE 32UL
#endif /* __ASM_MACH_YOSEMITE_CPU_FEATURE_OVERRIDES_H */

14
include/asm-mips/war.h
View File

@ -176,6 +176,17 @@
#define RM9000_CDEX_SMP_WAR 1
#endif
/*
* The RM9000 has a bug (though PMC-Sierra opposes it being called that)
* where invalid instructions in the same I-cache line worth of instructions
* being fetched may case spurious exceptions.
*/
#if defined(CONFIG_MOMENCO_JAGUAR_ATX) || defined(CONFIG_MOMENCO_OCELOT_3) || \
defined(CONFIG_PMC_YOSEMITE)
#define ICACHE_REFILLS_WORKAROUND_WAR 1
#endif
/*
* ON the R10000 upto version 2.6 (not sure about 2.7) there is a bug that
* may cause ll / sc and lld / scd sequences to execute non-atomically.
@ -187,6 +198,9 @@
/*
* Workarounds default to off
*/
#ifndef ICACHE_REFILLS_WORKAROUND_WAR
#define ICACHE_REFILLS_WORKAROUND_WAR 0
#endif
#ifndef R4600_V1_INDEX_ICACHEOP_WAR
#define R4600_V1_INDEX_ICACHEOP_WAR 0
#endif