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Diffstat (limited to 'arch/parisc/kernel/signal.c')
-rw-r--r--arch/parisc/kernel/signal.c80
1 files changed, 24 insertions, 56 deletions
diff --git a/arch/parisc/kernel/signal.c b/arch/parisc/kernel/signal.c
index 594459bde14..1cba8f29bb4 100644
--- a/arch/parisc/kernel/signal.c
+++ b/arch/parisc/kernel/signal.c
@@ -56,13 +56,6 @@
#define A(__x) ((unsigned long)(__x))
/*
- * Atomically swap in the new signal mask, and wait for a signal.
- */
-#ifdef CONFIG_64BIT
-#include "sys32.h"
-#endif
-
-/*
* Do a signal return - restore sigcontext.
*/
@@ -85,7 +78,7 @@ restore_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs)
err |= __copy_from_user(regs->iaoq, sc->sc_iaoq, sizeof(regs->iaoq));
err |= __copy_from_user(regs->iasq, sc->sc_iasq, sizeof(regs->iasq));
err |= __get_user(regs->sar, &sc->sc_sar);
- DBG(2,"restore_sigcontext: iaoq is 0x%#lx / 0x%#lx\n",
+ DBG(2,"restore_sigcontext: iaoq is %#lx / %#lx\n",
regs->iaoq[0],regs->iaoq[1]);
DBG(2,"restore_sigcontext: r28 is %ld\n", regs->gr[28]);
return err;
@@ -113,6 +106,8 @@ sys_rt_sigreturn(struct pt_regs *regs, int in_syscall)
(usp - sigframe_size);
DBG(2,"sys_rt_sigreturn: frame is %p\n", frame);
+ regs->orig_r28 = 1; /* no restarts for sigreturn */
+
#ifdef CONFIG_64BIT
compat_frame = (struct compat_rt_sigframe __user *)frame;
@@ -141,7 +136,7 @@ sys_rt_sigreturn(struct pt_regs *regs, int in_syscall)
goto give_sigsegv;
DBG(1,"sys_rt_sigreturn: usp %#08lx stack 0x%p\n",
usp, &compat_frame->uc.uc_stack);
- if (do_sigaltstack32(&compat_frame->uc.uc_stack, NULL, usp) == -EFAULT)
+ if (compat_restore_altstack(&compat_frame->uc.uc_stack))
goto give_sigsegv;
} else
#endif
@@ -152,7 +147,7 @@ sys_rt_sigreturn(struct pt_regs *regs, int in_syscall)
goto give_sigsegv;
DBG(1,"sys_rt_sigreturn: usp %#08lx stack 0x%p\n",
usp, &frame->uc.uc_stack);
- if (do_sigaltstack(&frame->uc.uc_stack, NULL, usp) == -EFAULT)
+ if (restore_altstack(&frame->uc.uc_stack))
goto give_sigsegv;
}
@@ -188,8 +183,10 @@ get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size)
DBG(1,"get_sigframe: ka = %#lx, sp = %#lx, frame_size = %#lx\n",
(unsigned long)ka, sp, frame_size);
+ /* Align alternate stack and reserve 64 bytes for the signal
+ handler's frame marker. */
if ((ka->sa.sa_flags & SA_ONSTACK) != 0 && ! sas_ss_flags(sp))
- sp = current->sas_ss_sp; /* Stacks grow up! */
+ sp = (current->sas_ss_sp + 0x7f) & ~0x3f; /* Stacks grow up! */
DBG(1,"get_sigframe: Returning sp = %#lx\n", (unsigned long)sp);
return (void __user *) sp; /* Stacks grow up. Fun. */
@@ -238,7 +235,6 @@ setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
unsigned long haddr, sigframe_size;
int err = 0;
#ifdef CONFIG_64BIT
- compat_int_t compat_val;
struct compat_rt_sigframe __user * compat_frame;
compat_sigset_t compat_set;
#endif
@@ -258,15 +254,7 @@ setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
if (is_compat_task()) {
DBG(1,"setup_rt_frame: frame->info = 0x%p\n", &compat_frame->info);
err |= copy_siginfo_to_user32(&compat_frame->info, info);
- DBG(1,"SETUP_RT_FRAME: 1\n");
- compat_val = (compat_int_t)current->sas_ss_sp;
- err |= __put_user(compat_val, &compat_frame->uc.uc_stack.ss_sp);
- DBG(1,"SETUP_RT_FRAME: 2\n");
- compat_val = (compat_int_t)current->sas_ss_size;
- err |= __put_user(compat_val, &compat_frame->uc.uc_stack.ss_size);
- DBG(1,"SETUP_RT_FRAME: 3\n");
- compat_val = sas_ss_flags(regs->gr[30]);
- err |= __put_user(compat_val, &compat_frame->uc.uc_stack.ss_flags);
+ err |= __compat_save_altstack( &compat_frame->uc.uc_stack, regs->gr[30]);
DBG(1,"setup_rt_frame: frame->uc = 0x%p\n", &compat_frame->uc);
DBG(1,"setup_rt_frame: frame->uc.uc_mcontext = 0x%p\n", &compat_frame->uc.uc_mcontext);
err |= setup_sigcontext32(&compat_frame->uc.uc_mcontext,
@@ -278,10 +266,7 @@ setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
{
DBG(1,"setup_rt_frame: frame->info = 0x%p\n", &frame->info);
err |= copy_siginfo_to_user(&frame->info, info);
- err |= __put_user(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
- err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
- err |= __put_user(sas_ss_flags(regs->gr[30]),
- &frame->uc.uc_stack.ss_flags);
+ err |= __save_altstack(&frame->uc.uc_stack, regs->gr[30]);
DBG(1,"setup_rt_frame: frame->uc = 0x%p\n", &frame->uc);
DBG(1,"setup_rt_frame: frame->uc.uc_mcontext = 0x%p\n", &frame->uc.uc_mcontext);
err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, in_syscall);
@@ -308,7 +293,7 @@ setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
#if DEBUG_SIG
/* Assert that we're flushing in the correct space... */
{
- int sid;
+ unsigned long sid;
asm ("mfsp %%sr3,%0" : "=r" (sid));
DBG(1,"setup_rt_frame: Flushing 64 bytes at space %#x offset %p\n",
sid, frame->tramp);
@@ -437,7 +422,7 @@ give_sigsegv:
* OK, we're invoking a handler.
*/
-static long
+static void
handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
struct pt_regs *regs, int in_syscall)
{
@@ -447,7 +432,7 @@ handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
/* Set up the stack frame */
if (!setup_rt_frame(sig, ka, info, oldset, regs, in_syscall))
- return 0;
+ return;
signal_delivered(sig, info, ka, regs,
test_thread_flag(TIF_SINGLESTEP) ||
@@ -455,13 +440,14 @@ handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
DBG(1,KERN_DEBUG "do_signal: Exit (success), regs->gr[28] = %ld\n",
regs->gr[28]);
-
- return 1;
}
static inline void
syscall_restart(struct pt_regs *regs, struct k_sigaction *ka)
{
+ if (regs->orig_r28)
+ return;
+ regs->orig_r28 = 1; /* no more restarts */
/* Check the return code */
switch (regs->gr[28]) {
case -ERESTART_RESTARTBLOCK:
@@ -482,8 +468,6 @@ syscall_restart(struct pt_regs *regs, struct k_sigaction *ka)
* we have to do is fiddle the return pointer.
*/
regs->gr[31] -= 8; /* delayed branching */
- /* Preserve original r28. */
- regs->gr[28] = regs->orig_r28;
break;
}
}
@@ -491,6 +475,9 @@ syscall_restart(struct pt_regs *regs, struct k_sigaction *ka)
static inline void
insert_restart_trampoline(struct pt_regs *regs)
{
+ if (regs->orig_r28)
+ return;
+ regs->orig_r28 = 1; /* no more restarts */
switch(regs->gr[28]) {
case -ERESTART_RESTARTBLOCK: {
/* Restart the system call - no handlers present */
@@ -525,9 +512,6 @@ insert_restart_trampoline(struct pt_regs *regs)
flush_user_icache_range(regs->gr[30], regs->gr[30] + 4);
regs->gr[31] = regs->gr[30] + 8;
- /* Preserve original r28. */
- regs->gr[28] = regs->orig_r28;
-
return;
}
case -ERESTARTNOHAND:
@@ -539,9 +523,6 @@ insert_restart_trampoline(struct pt_regs *regs)
* slot of the branch external instruction.
*/
regs->gr[31] -= 8;
- /* Preserve original r28. */
- regs->gr[28] = regs->orig_r28;
-
return;
}
default:
@@ -570,30 +551,17 @@ do_signal(struct pt_regs *regs, long in_syscall)
DBG(1,"\ndo_signal: regs=0x%p, sr7 %#lx, in_syscall=%d\n",
regs, regs->sr[7], in_syscall);
- /* Everyone else checks to see if they are in kernel mode at
- this point and exits if that's the case. I'm not sure why
- we would be called in that case, but for some reason we
- are. */
-
- /* May need to force signal if handle_signal failed to deliver */
- while (1) {
- signr = get_signal_to_deliver(&info, &ka, regs, NULL);
- DBG(3,"do_signal: signr = %d, regs->gr[28] = %ld\n", signr, regs->gr[28]);
+ signr = get_signal_to_deliver(&info, &ka, regs, NULL);
+ DBG(3,"do_signal: signr = %d, regs->gr[28] = %ld\n", signr, regs->gr[28]);
- if (signr <= 0)
- break;
-
+ if (signr > 0) {
/* Restart a system call if necessary. */
if (in_syscall)
syscall_restart(regs, &ka);
- /* Whee! Actually deliver the signal. If the
- delivery failed, we need to continue to iterate in
- this loop so we can deliver the SIGSEGV... */
- if (handle_signal(signr, &info, &ka, regs, in_syscall))
- return;
+ handle_signal(signr, &info, &ka, regs, in_syscall);
+ return;
}
- /* end of while(1) looping forever if we can't force a signal */
/* Did we come from a system call? */
if (in_syscall)
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-10 15:19:16 +0000