Commit 02416dcf authored by Ralf Baechle's avatar Ralf Baechle

Redo RM9000 workaround which along with other DSP ASE changes was

causing some headache for debuggers knowing about signal frames.
Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent aac8aa77
...@@ -160,7 +160,7 @@ restore_sigcontext(struct pt_regs *regs, struct sigcontext *sc) ...@@ -160,7 +160,7 @@ restore_sigcontext(struct pt_regs *regs, struct sigcontext *sc)
static inline void * static inline void *
get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size) 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 */ /* Default to using normal stack */
sp = regs->regs[29]; sp = regs->regs[29];
...@@ -176,10 +176,32 @@ get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size) ...@@ -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)) if ((ka->sa.sa_flags & SA_ONSTACK) && (sas_ss_flags (sp) == 0))
sp = current->sas_ss_sp + current->sas_ss_size; sp = current->sas_ss_sp + current->sas_ss_size;
if (PLAT_TRAMPOLINE_STUFF_LINE) return (void *)((sp - frame_size) & (ICACHE_REFILLS_WORKAROUND_WAR ? 32 : ALMASK));
almask = ~(PLAT_TRAMPOLINE_STUFF_LINE - 1); }
else
almask = ALMASK; static inline int install_sigtramp(unsigned int __user *tramp,
unsigned int syscall)
{
int err;
return (void *)((sp - frame_size) & almask); /*
* 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;
} }
...@@ -8,6 +8,7 @@ ...@@ -8,6 +8,7 @@
* Copyright (C) 1999, 2000 Silicon Graphics, Inc. * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
*/ */
#include <linux/config.h> #include <linux/config.h>
#include <linux/cache.h>
#include <linux/sched.h> #include <linux/sched.h>
#include <linux/mm.h> #include <linux/mm.h>
#include <linux/personality.h> #include <linux/personality.h>
...@@ -30,6 +31,7 @@ ...@@ -30,6 +31,7 @@
#include <asm/uaccess.h> #include <asm/uaccess.h>
#include <asm/ucontext.h> #include <asm/ucontext.h>
#include <asm/cpu-features.h> #include <asm/cpu-features.h>
#include <asm/war.h>
#include "signal-common.h" #include "signal-common.h"
...@@ -157,26 +159,39 @@ asmlinkage int sys_sigaltstack(nabi_no_regargs struct pt_regs regs) ...@@ -157,26 +159,39 @@ asmlinkage int sys_sigaltstack(nabi_no_regargs struct pt_regs regs)
return do_sigaltstack(uss, uoss, usp); return do_sigaltstack(uss, uoss, usp);
} }
#if PLAT_TRAMPOLINE_STUFF_LINE /*
#define __tramp __attribute__((aligned(PLAT_TRAMPOLINE_STUFF_LINE))) * Horribly complicated - with the bloody RM9000 workarounds enabled
#else * the signal trampolines is moving to the end of the structure so we can
#define __tramp * increase the alignment without breaking software compatibility.
#endif */
#ifdef CONFIG_TRAD_SIGNALS #ifdef CONFIG_TRAD_SIGNALS
struct sigframe { struct sigframe {
u32 sf_ass[4]; /* argument save space for o32 */ u32 sf_ass[4]; /* argument save space for o32 */
u32 sf_code[2] __tramp; /* signal trampoline */ #if ICACHE_REFILLS_WORKAROUND_WAR
struct sigcontext sf_sc __tramp; u32 sf_pad[2];
#else
u32 sf_code[2]; /* signal trampoline */
#endif
struct sigcontext sf_sc;
sigset_t sf_mask; sigset_t sf_mask;
#if ICACHE_REFILLS_WORKAROUND_WAR
u32 sf_code[8] ____cacheline_aligned; /* signal trampoline */
#endif
}; };
#endif #endif
struct rt_sigframe { struct rt_sigframe {
u32 rs_ass[4]; /* argument save space for o32 */ u32 rs_ass[4]; /* argument save space for o32 */
u32 rs_code[2] __tramp; /* signal trampoline */ #if ICACHE_REFILLS_WORKAROUND_WAR
struct siginfo rs_info __tramp; u32 rs_pad[2];
#else
u32 rs_code[2]; /* signal trampoline */
#endif
struct siginfo rs_info;
struct ucontext rs_uc; struct ucontext rs_uc;
#if ICACHE_REFILLS_WORKAROUND_WAR
u32 rs_code[8] ____cacheline_aligned; /* signal trampoline */
#endif
}; };
#ifdef CONFIG_TRAD_SIGNALS #ifdef CONFIG_TRAD_SIGNALS
...@@ -273,17 +288,7 @@ void setup_frame(struct k_sigaction * ka, struct pt_regs *regs, ...@@ -273,17 +288,7 @@ void setup_frame(struct k_sigaction * ka, struct pt_regs *regs,
if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
goto give_sigsegv; goto give_sigsegv;
/* install_sigtramp(frame->sf_code, __NR_sigreturn);
* 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);
err |= setup_sigcontext(regs, &frame->sf_sc); err |= setup_sigcontext(regs, &frame->sf_sc);
err |= __copy_to_user(&frame->sf_mask, set, sizeof(*set)); 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, ...@@ -329,17 +334,7 @@ void setup_rt_frame(struct k_sigaction * ka, struct pt_regs *regs,
if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
goto give_sigsegv; goto give_sigsegv;
/* install_sigtramp(frame->rs_code, __NR_rt_sigreturn);
* 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);
/* Create siginfo. */ /* Create siginfo. */
err |= copy_siginfo_to_user(&frame->rs_info, info); err |= copy_siginfo_to_user(&frame->rs_info, info);
......
...@@ -7,6 +7,7 @@ ...@@ -7,6 +7,7 @@
* Copyright (C) 1994 - 2000 Ralf Baechle * Copyright (C) 1994 - 2000 Ralf Baechle
* Copyright (C) 1999, 2000 Silicon Graphics, Inc. * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
*/ */
#include <linux/cache.h>
#include <linux/sched.h> #include <linux/sched.h>
#include <linux/mm.h> #include <linux/mm.h>
#include <linux/smp.h> #include <linux/smp.h>
...@@ -30,6 +31,7 @@ ...@@ -30,6 +31,7 @@
#include <asm/ucontext.h> #include <asm/ucontext.h>
#include <asm/system.h> #include <asm/system.h>
#include <asm/fpu.h> #include <asm/fpu.h>
#include <asm/war.h>
#define SI_PAD_SIZE32 ((SI_MAX_SIZE/sizeof(int)) - 3) #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) ...@@ -392,16 +394,30 @@ static int restore_sigcontext32(struct pt_regs *regs, struct sigcontext32 *sc)
struct sigframe { struct sigframe {
u32 sf_ass[4]; /* argument save space for o32 */ 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 */ u32 sf_code[2]; /* signal trampoline */
#endif
struct sigcontext32 sf_sc; struct sigcontext32 sf_sc;
sigset_t sf_mask; sigset_t sf_mask;
#if ICACHE_REFILLS_WORKAROUND_WAR
u32 sf_code[8] ____cacheline_aligned; /* signal trampoline */
#endif
}; };
struct rt_sigframe32 { struct rt_sigframe32 {
u32 rs_ass[4]; /* argument save space for o32 */ 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 */ u32 rs_code[2]; /* signal trampoline */
#endif
compat_siginfo_t rs_info; compat_siginfo_t rs_info;
struct ucontext32 rs_uc; 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) int copy_siginfo_to_user32(compat_siginfo_t *to, siginfo_t *from)
......
...@@ -15,6 +15,8 @@ ...@@ -15,6 +15,8 @@
* along with this program; if not, write to the Free Software * along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. * 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/sched.h>
#include <linux/mm.h> #include <linux/mm.h>
#include <linux/smp.h> #include <linux/smp.h>
...@@ -36,6 +38,7 @@ ...@@ -36,6 +38,7 @@
#include <asm/system.h> #include <asm/system.h>
#include <asm/fpu.h> #include <asm/fpu.h>
#include <asm/cpu-features.h> #include <asm/cpu-features.h>
#include <asm/war.h>
#include "signal-common.h" #include "signal-common.h"
...@@ -62,17 +65,18 @@ struct ucontextn32 { ...@@ -62,17 +65,18 @@ struct ucontextn32 {
sigset_t uc_sigmask; /* mask last for extensibility */ 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 { struct rt_sigframe_n32 {
u32 rs_ass[4]; /* argument save space for o32 */ u32 rs_ass[4]; /* argument save space for o32 */
u32 rs_code[2] __tramp; /* signal trampoline */ #if ICACHE_REFILLS_WORKAROUND_WAR
struct siginfo rs_info __tramp; u32 rs_pad[2];
#else
u32 rs_code[2]; /* signal trampoline */
#endif
struct siginfo rs_info;
struct ucontextn32 rs_uc; struct ucontextn32 rs_uc;
#if ICACHE_REFILLS_WORKAROUND_WAR
u32 rs_code[8] ____cacheline_aligned; /* signal trampoline */
#endif
}; };
save_static_function(sysn32_rt_sigreturn); save_static_function(sysn32_rt_sigreturn);
...@@ -137,17 +141,7 @@ void setup_rt_frame_n32(struct k_sigaction * ka, ...@@ -137,17 +141,7 @@ void setup_rt_frame_n32(struct k_sigaction * ka,
if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
goto give_sigsegv; goto give_sigsegv;
/* install_sigtramp(frame->rs_code, __NR_N32_rt_sigreturn);
* 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);
/* Create siginfo. */ /* Create siginfo. */
err |= copy_siginfo_to_user(&frame->rs_info, info); err |= copy_siginfo_to_user(&frame->rs_info, info);
......
...@@ -109,17 +109,6 @@ ...@@ -109,17 +109,6 @@
#define cpu_has_dsp (cpu_data[0].ases & MIPS_ASE_DSP) #define cpu_has_dsp (cpu_data[0].ases & MIPS_ASE_DSP)
#endif #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 #ifdef CONFIG_32BIT
# ifndef cpu_has_nofpuex # ifndef cpu_has_nofpuex
# define cpu_has_nofpuex (cpu_data[0].options & MIPS_CPU_NOFPUEX) # define cpu_has_nofpuex (cpu_data[0].options & MIPS_CPU_NOFPUEX)
......
...@@ -37,10 +37,4 @@ ...@@ -37,10 +37,4 @@
#define cpu_icache_line_size() 32 #define cpu_icache_line_size() 32
#define cpu_scache_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 */ #endif /* __ASM_MACH_JA_CPU_FEATURE_OVERRIDES_H */
...@@ -40,10 +40,4 @@ ...@@ -40,10 +40,4 @@
#define cpu_icache_line_size() 32 #define cpu_icache_line_size() 32
#define cpu_scache_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 */ #endif /* __ASM_MACH_JA_CPU_FEATURE_OVERRIDES_H */
...@@ -37,10 +37,4 @@ ...@@ -37,10 +37,4 @@
#define cpu_icache_line_size() 32 #define cpu_icache_line_size() 32
#define cpu_scache_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 */ #endif /* __ASM_MACH_YOSEMITE_CPU_FEATURE_OVERRIDES_H */
...@@ -176,6 +176,17 @@ ...@@ -176,6 +176,17 @@
#define RM9000_CDEX_SMP_WAR 1 #define RM9000_CDEX_SMP_WAR 1
#endif #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 * 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. * may cause ll / sc and lld / scd sequences to execute non-atomically.
...@@ -187,6 +198,9 @@ ...@@ -187,6 +198,9 @@
/* /*
* Workarounds default to off * Workarounds default to off
*/ */
#ifndef ICACHE_REFILLS_WORKAROUND_WAR
#define ICACHE_REFILLS_WORKAROUND_WAR 0
#endif
#ifndef R4600_V1_INDEX_ICACHEOP_WAR #ifndef R4600_V1_INDEX_ICACHEOP_WAR
#define R4600_V1_INDEX_ICACHEOP_WAR 0 #define R4600_V1_INDEX_ICACHEOP_WAR 0
#endif #endif
......
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