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Diffstat (limited to 'arch/mips/kernel/signal.c')
-rw-r--r--arch/mips/kernel/signal.c143
1 files changed, 56 insertions, 87 deletions
diff --git a/arch/mips/kernel/signal.c b/arch/mips/kernel/signal.c
index 0209c1dd1429..9202a17db8f7 100644
--- a/arch/mips/kernel/signal.c
+++ b/arch/mips/kernel/signal.c
@@ -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>
@@ -21,6 +22,7 @@
#include <linux/unistd.h>
#include <linux/compiler.h>
+#include <asm/abi.h>
#include <asm/asm.h>
#include <linux/bitops.h>
#include <asm/cacheflush.h>
@@ -29,6 +31,7 @@
#include <asm/uaccess.h>
#include <asm/ucontext.h>
#include <asm/cpu-features.h>
+#include <asm/war.h>
#include "signal-common.h"
@@ -36,7 +39,7 @@
#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
-static int do_signal(sigset_t *oldset, struct pt_regs *regs);
+int do_signal(sigset_t *oldset, struct pt_regs *regs);
/*
* Atomically swap in the new signal mask, and wait for a signal.
@@ -47,9 +50,10 @@ save_static_function(sys_sigsuspend);
__attribute_used__ noinline static int
_sys_sigsuspend(nabi_no_regargs struct pt_regs regs)
{
- sigset_t *uset, saveset, newset;
+ sigset_t saveset, newset;
+ sigset_t __user *uset;
- uset = (sigset_t *) regs.regs[4];
+ uset = (sigset_t __user *) regs.regs[4];
if (copy_from_user(&newset, uset, sizeof(sigset_t)))
return -EFAULT;
sigdelsetmask(&newset, ~_BLOCKABLE);
@@ -75,7 +79,8 @@ save_static_function(sys_rt_sigsuspend);
__attribute_used__ noinline static int
_sys_rt_sigsuspend(nabi_no_regargs struct pt_regs regs)
{
- sigset_t *unewset, saveset, newset;
+ sigset_t saveset, newset;
+ sigset_t __user *unewset;
size_t sigsetsize;
/* XXX Don't preclude handling different sized sigset_t's. */
@@ -83,7 +88,7 @@ _sys_rt_sigsuspend(nabi_no_regargs struct pt_regs regs)
if (sigsetsize != sizeof(sigset_t))
return -EINVAL;
- unewset = (sigset_t *) regs.regs[4];
+ unewset = (sigset_t __user *) regs.regs[4];
if (copy_from_user(&newset, unewset, sizeof(newset)))
return -EFAULT;
sigdelsetmask(&newset, ~_BLOCKABLE);
@@ -147,33 +152,46 @@ asmlinkage int sys_sigaction(int sig, const struct sigaction *act,
asmlinkage int sys_sigaltstack(nabi_no_regargs struct pt_regs regs)
{
- const stack_t *uss = (const stack_t *) regs.regs[4];
- stack_t *uoss = (stack_t *) regs.regs[5];
+ const stack_t __user *uss = (const stack_t __user *) regs.regs[4];
+ stack_t __user *uoss = (stack_t __user *) regs.regs[5];
unsigned long usp = regs.regs[29];
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
@@ -214,7 +232,7 @@ _sys_sigreturn(nabi_no_regargs struct pt_regs regs)
badframe:
force_sig(SIGSEGV, current);
}
-#endif
+#endif /* CONFIG_TRAD_SIGNALS */
save_static_function(sys_rt_sigreturn);
__attribute_used__ noinline static void
@@ -260,7 +278,7 @@ badframe:
}
#ifdef CONFIG_TRAD_SIGNALS
-static void inline setup_frame(struct k_sigaction * ka, struct pt_regs *regs,
+int setup_frame(struct k_sigaction * ka, struct pt_regs *regs,
int signr, sigset_t *set)
{
struct sigframe *frame;
@@ -270,17 +288,7 @@ static void inline 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));
@@ -309,14 +317,15 @@ static void inline setup_frame(struct k_sigaction * ka, struct pt_regs *regs,
current->comm, current->pid,
frame, regs->cp0_epc, frame->regs[31]);
#endif
- return;
+ return 1;
give_sigsegv:
force_sigsegv(signr, current);
+ return 0;
}
#endif
-static void inline setup_rt_frame(struct k_sigaction * ka, struct pt_regs *regs,
+int setup_rt_frame(struct k_sigaction * ka, struct pt_regs *regs,
int signr, sigset_t *set, siginfo_t *info)
{
struct rt_sigframe *frame;
@@ -326,17 +335,7 @@ static void inline 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);
@@ -378,18 +377,21 @@ static void inline setup_rt_frame(struct k_sigaction * ka, struct pt_regs *regs,
current->comm, current->pid,
frame, regs->cp0_epc, regs->regs[31]);
#endif
- return;
+ return 1;
give_sigsegv:
force_sigsegv(signr, current);
+ return 0;
}
extern void setup_rt_frame_n32(struct k_sigaction * ka,
struct pt_regs *regs, int signr, sigset_t *set, siginfo_t *info);
-static inline void handle_signal(unsigned long sig, siginfo_t *info,
+static inline int handle_signal(unsigned long sig, siginfo_t *info,
struct k_sigaction *ka, sigset_t *oldset, struct pt_regs *regs)
{
+ int ret;
+
switch(regs->regs[0]) {
case ERESTART_RESTARTBLOCK:
case ERESTARTNOHAND:
@@ -408,22 +410,10 @@ static inline void handle_signal(unsigned long sig, siginfo_t *info,
regs->regs[0] = 0; /* Don't deal with this again. */
-#ifdef CONFIG_TRAD_SIGNALS
- if (ka->sa.sa_flags & SA_SIGINFO) {
-#else
- if (1) {
-#endif
-#ifdef CONFIG_MIPS32_N32
- if ((current->thread.mflags & MF_ABI_MASK) == MF_N32)
- setup_rt_frame_n32 (ka, regs, sig, oldset, info);
- else
-#endif
- setup_rt_frame(ka, regs, sig, oldset, info);
- }
-#ifdef CONFIG_TRAD_SIGNALS
+ if (sig_uses_siginfo(ka))
+ ret = current->thread.abi->setup_rt_frame(ka, regs, sig, oldset, info);
else
- setup_frame(ka, regs, sig, oldset);
-#endif
+ ret = current->thread.abi->setup_frame(ka, regs, sig, oldset);
spin_lock_irq(&current->sighand->siglock);
sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
@@ -431,23 +421,16 @@ static inline void handle_signal(unsigned long sig, siginfo_t *info,
sigaddset(&current->blocked,sig);
recalc_sigpending();
spin_unlock_irq(&current->sighand->siglock);
-}
-extern int do_signal32(sigset_t *oldset, struct pt_regs *regs);
-extern int do_irix_signal(sigset_t *oldset, struct pt_regs *regs);
+ return ret;
+}
-static int do_signal(sigset_t *oldset, struct pt_regs *regs)
+int do_signal(sigset_t *oldset, struct pt_regs *regs)
{
struct k_sigaction ka;
siginfo_t info;
int signr;
-#ifdef CONFIG_BINFMT_ELF32
- if ((current->thread.mflags & MF_ABI_MASK) == MF_O32) {
- return do_signal32(oldset, regs);
- }
-#endif
-
/*
* We want the common case to go fast, which is why we may in certain
* cases get here from kernel mode. Just return without doing anything
@@ -463,10 +446,8 @@ static int do_signal(sigset_t *oldset, struct pt_regs *regs)
oldset = &current->blocked;
signr = get_signal_to_deliver(&info, &ka, regs, NULL);
- if (signr > 0) {
- handle_signal(signr, &info, &ka, oldset, regs);
- return 1;
- }
+ if (signr > 0)
+ return handle_signal(signr, &info, &ka, oldset, regs);
no_signal:
/*
@@ -499,18 +480,6 @@ asmlinkage void do_notify_resume(struct pt_regs *regs, sigset_t *oldset,
{
/* deal with pending signal delivery */
if (thread_info_flags & _TIF_SIGPENDING) {
-#ifdef CONFIG_BINFMT_ELF32
- if (likely((current->thread.mflags & MF_ABI_MASK) == MF_O32)) {
- do_signal32(oldset, regs);
- return;
- }
-#endif
-#ifdef CONFIG_BINFMT_IRIX
- if (unlikely(current->personality != PER_LINUX)) {
- do_irix_signal(oldset, regs);
- return;
- }
-#endif
- do_signal(oldset, regs);
+ current->thread.abi->do_signal(oldset, regs);
}
}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.