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Diffstat (limited to 'arch/mips/kernel/signal.c')
-rw-r--r--arch/mips/kernel/signal.c86
1 files changed, 19 insertions, 67 deletions
diff --git a/arch/mips/kernel/signal.c b/arch/mips/kernel/signal.c
index d0c68b5..2099d5a 100644
--- a/arch/mips/kernel/signal.c
+++ b/arch/mips/kernel/signal.c
@@ -32,6 +32,7 @@
#include <asm/ucontext.h>
#include <asm/cpu-features.h>
#include <asm/war.h>
+#include <asm/vdso.h>
#include "signal-common.h"
@@ -44,47 +45,20 @@ extern asmlinkage int _restore_fp_context(struct sigcontext __user *sc);
extern asmlinkage int fpu_emulator_save_context(struct sigcontext __user *sc);
extern asmlinkage int fpu_emulator_restore_context(struct sigcontext __user *sc);
-/*
- * 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.
- */
-#if ICACHE_REFILLS_WORKAROUND_WAR == 0
-
struct sigframe {
u32 sf_ass[4]; /* argument save space for o32 */
- u32 sf_code[2]; /* signal trampoline */
+ u32 sf_pad[2]; /* Was: signal trampoline */
struct sigcontext sf_sc;
sigset_t sf_mask;
};
struct rt_sigframe {
u32 rs_ass[4]; /* argument save space for o32 */
- u32 rs_code[2]; /* signal trampoline */
+ u32 rs_pad[2]; /* Was: signal trampoline */
struct siginfo rs_info;
struct ucontext rs_uc;
};
-#else
-
-struct sigframe {
- u32 sf_ass[4]; /* argument save space for o32 */
- u32 sf_pad[2];
- struct sigcontext sf_sc; /* hw context */
- sigset_t sf_mask;
- u32 sf_code[8] ____cacheline_aligned; /* signal trampoline */
-};
-
-struct rt_sigframe {
- u32 rs_ass[4]; /* argument save space for o32 */
- u32 rs_pad[2];
- struct siginfo rs_info;
- struct ucontext rs_uc;
- u32 rs_code[8] ____cacheline_aligned; /* signal trampoline */
-};
-
-#endif
-
/*
* Helper routines
*/
@@ -266,32 +240,6 @@ void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs,
return (void __user *)((sp - frame_size) & (ICACHE_REFILLS_WORKAROUND_WAR ? ~(cpu_icache_line_size()-1) : ALMASK));
}
-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;
-}
-
/*
* Atomically swap in the new signal mask, and wait for a signal.
*/
@@ -484,8 +432,8 @@ badframe:
}
#ifdef CONFIG_TRAD_SIGNALS
-static int setup_frame(struct k_sigaction * ka, struct pt_regs *regs,
- int signr, sigset_t *set)
+static int setup_frame(void *sig_return, struct k_sigaction *ka,
+ struct pt_regs *regs, int signr, sigset_t *set)
{
struct sigframe __user *frame;
int err = 0;
@@ -494,8 +442,6 @@ static int setup_frame(struct k_sigaction * ka, struct pt_regs *regs,
if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
goto give_sigsegv;
- err |= install_sigtramp(frame->sf_code, __NR_sigreturn);
-
err |= setup_sigcontext(regs, &frame->sf_sc);
err |= __copy_to_user(&frame->sf_mask, set, sizeof(*set));
if (err)
@@ -515,7 +461,7 @@ static int setup_frame(struct k_sigaction * ka, struct pt_regs *regs,
regs->regs[ 5] = 0;
regs->regs[ 6] = (unsigned long) &frame->sf_sc;
regs->regs[29] = (unsigned long) frame;
- regs->regs[31] = (unsigned long) frame->sf_code;
+ regs->regs[31] = (unsigned long) sig_return;
regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler;
DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n",
@@ -529,8 +475,9 @@ give_sigsegv:
}
#endif
-static int setup_rt_frame(struct k_sigaction * ka, struct pt_regs *regs,
- int signr, sigset_t *set, siginfo_t *info)
+static int setup_rt_frame(void *sig_return, struct k_sigaction *ka,
+ struct pt_regs *regs, int signr, sigset_t *set,
+ siginfo_t *info)
{
struct rt_sigframe __user *frame;
int err = 0;
@@ -539,8 +486,6 @@ static int setup_rt_frame(struct k_sigaction * ka, struct pt_regs *regs,
if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
goto give_sigsegv;
- err |= install_sigtramp(frame->rs_code, __NR_rt_sigreturn);
-
/* Create siginfo. */
err |= copy_siginfo_to_user(&frame->rs_info, info);
@@ -573,7 +518,7 @@ static int setup_rt_frame(struct k_sigaction * ka, struct pt_regs *regs,
regs->regs[ 5] = (unsigned long) &frame->rs_info;
regs->regs[ 6] = (unsigned long) &frame->rs_uc;
regs->regs[29] = (unsigned long) frame;
- regs->regs[31] = (unsigned long) frame->rs_code;
+ regs->regs[31] = (unsigned long) sig_return;
regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler;
DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n",
@@ -590,8 +535,11 @@ give_sigsegv:
struct mips_abi mips_abi = {
#ifdef CONFIG_TRAD_SIGNALS
.setup_frame = setup_frame,
+ .signal_return_offset = offsetof(struct mips_vdso, signal_trampoline),
#endif
.setup_rt_frame = setup_rt_frame,
+ .rt_signal_return_offset =
+ offsetof(struct mips_vdso, rt_signal_trampoline),
.restart = __NR_restart_syscall
};
@@ -599,6 +547,8 @@ static int handle_signal(unsigned long sig, siginfo_t *info,
struct k_sigaction *ka, sigset_t *oldset, struct pt_regs *regs)
{
int ret;
+ struct mips_abi *abi = current->thread.abi;
+ void *vdso = current->mm->context.vdso;
switch(regs->regs[0]) {
case ERESTART_RESTARTBLOCK:
@@ -619,9 +569,11 @@ static int handle_signal(unsigned long sig, siginfo_t *info,
regs->regs[0] = 0; /* Don't deal with this again. */
if (sig_uses_siginfo(ka))
- ret = current->thread.abi->setup_rt_frame(ka, regs, sig, oldset, info);
+ ret = abi->setup_rt_frame(vdso + abi->rt_signal_return_offset,
+ ka, regs, sig, oldset, info);
else
- ret = current->thread.abi->setup_frame(ka, regs, sig, oldset);
+ ret = abi->setup_frame(vdso + abi->signal_return_offset,
+ ka, regs, sig, oldset);
spin_lock_irq(&current->sighand->siglock);
sigorsets(&current->blocked, &current->blocked, &ka->sa.sa_mask);