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powerpc: switch to generic sigaltstack 

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2012-12-23 03:26:46 -05:00
parent 0aa0203fb4
commit 7cce246557
6 changed files with 13 additions and 87 deletions
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1
arch/powerpc/Kconfig
View File

@ -144,6 +144,7 @@ config PPC
select HAVE_MOD_ARCH_SPECIFIC
select MODULES_USE_ELF_RELA
select CLONE_BACKWARDS
select GENERIC_SIGALTSTACK
config EARLY_PRINTK
bool

4
arch/powerpc/include/asm/syscalls.h
View File

@ -22,9 +22,5 @@ asmlinkage long ppc64_personality(unsigned long personality);
asmlinkage int ppc_rtas(struct rtas_args __user *uargs);
asmlinkage time_t sys64_time(time_t __user * tloc);
asmlinkage long sys_sigaltstack(const stack_t __user *uss,
stack_t __user *uoss, unsigned long r5, unsigned long r6,
unsigned long r7, unsigned long r8, struct pt_regs *regs);
#endif /* __KERNEL__ */
#endif /* __ASM_POWERPC_SYSCALLS_H */

8
arch/powerpc/kernel/ppc32.h
View File

@ -34,12 +34,6 @@ struct sigaction32 {
compat_sigset_t sa_mask; /* A 32 bit mask */
};
typedef struct sigaltstack_32 {
unsigned int ss_sp;
int ss_flags;
compat_size_t ss_size;
} stack_32_t;
struct pt_regs32 {
unsigned int gpr[32];
unsigned int nip;
@ -75,7 +69,7 @@ struct mcontext32 {
struct ucontext32 {
unsigned int uc_flags;
unsigned int uc_link;
stack_32_t uc_stack;
compat_stack_t uc_stack;
int uc_pad[7];
compat_uptr_t uc_regs; /* points to uc_mcontext field */
compat_sigset_t uc_sigmask; /* mask last for extensibility */

7
arch/powerpc/kernel/signal.c
View File

@ -169,10 +169,3 @@ void do_notify_resume(struct pt_regs *regs, unsigned long thread_info_flags)
tracehook_notify_resume(regs);
}
}
long sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss,
unsigned long r5, unsigned long r6, unsigned long r7,
unsigned long r8, struct pt_regs *regs)
{
return do_sigaltstack(uss, uoss, regs->gpr[1]);
}

69
arch/powerpc/kernel/signal_32.c
View File

@ -67,6 +67,8 @@
#define mcontext mcontext32
#define ucontext ucontext32
#define __save_altstack __compat_save_altstack
/*
* Userspace code may pass a ucontext which doesn't include VSX added
* at the end. We need to check for this case.
@ -763,55 +765,6 @@ long compat_sys_rt_sigqueueinfo(u32 pid, u32 sig, compat_siginfo_t __user *uinfo
set_fs (old_fs);
return ret;
}
/*
* Start Alternate signal stack support
*
* System Calls
* sigaltatck compat_sys_sigaltstack
*/
int compat_sys_sigaltstack(u32 __new, u32 __old, int r5,
int r6, int r7, int r8, struct pt_regs *regs)
{
stack_32_t __user * newstack = compat_ptr(__new);
stack_32_t __user * oldstack = compat_ptr(__old);
stack_t uss, uoss;
int ret;
mm_segment_t old_fs;
unsigned long sp;
compat_uptr_t ss_sp;
/*
* set sp to the user stack on entry to the system call
* the system call router sets R9 to the saved registers
*/
sp = regs->gpr[1];
/* Put new stack info in local 64 bit stack struct */
if (newstack) {
if (get_user(ss_sp, &newstack->ss_sp) ||
__get_user(uss.ss_flags, &newstack->ss_flags) ||
__get_user(uss.ss_size, &newstack->ss_size))
return -EFAULT;
uss.ss_sp = compat_ptr(ss_sp);
}
old_fs = get_fs();
set_fs(KERNEL_DS);
/* The __user pointer casts are valid because of the set_fs() */
ret = do_sigaltstack(
newstack ? (stack_t __user *) &uss : NULL,
oldstack ? (stack_t __user *) &uoss : NULL,
sp);
set_fs(old_fs);
/* Copy the stack information to the user output buffer */
if (!ret && oldstack &&
(put_user(ptr_to_compat(uoss.ss_sp), &oldstack->ss_sp) ||
__put_user(uoss.ss_flags, &oldstack->ss_flags) ||
__put_user(uoss.ss_size, &oldstack->ss_size)))
return -EFAULT;
return ret;
}
#endif /* CONFIG_PPC64 */
/*
@ -838,10 +791,7 @@ int handle_rt_signal32(unsigned long sig, struct k_sigaction *ka,
if (copy_siginfo_to_user(&rt_sf->info, info)
|| __put_user(0, &rt_sf->uc.uc_flags)
|| __put_user(0, &rt_sf->uc.uc_link)
|| __put_user(current->sas_ss_sp, &rt_sf->uc.uc_stack.ss_sp)
|| __put_user(sas_ss_flags(regs->gpr[1]),
&rt_sf->uc.uc_stack.ss_flags)
|| __put_user(current->sas_ss_size, &rt_sf->uc.uc_stack.ss_size)
|| __save_altstack(&rt_sf->uc.uc_stack, regs->gpr[1])
|| __put_user(to_user_ptr(&rt_sf->uc.uc_mcontext),
&rt_sf->uc.uc_regs)
|| put_sigset_t(&rt_sf->uc.uc_sigmask, oldset))
@ -1038,14 +988,11 @@ long sys_rt_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8,
* change it. -- paulus
*/
#ifdef CONFIG_PPC64
/*
* We use the compat_sys_ version that does the 32/64 bits conversion
* and takes userland pointer directly. What about error checking ?
* nobody does any...
*/
compat_sys_sigaltstack((u32)(u64)&rt_sf->uc.uc_stack, 0, 0, 0, 0, 0, regs);
if (compat_restore_altstack(&rt_sf->uc.uc_stack))
goto bad;
#else
do_sigaltstack(&rt_sf->uc.uc_stack, NULL, regs->gpr[1]);
if (restore_altstack(&rt_sf->uc.uc_stack))
goto bad;
#endif
set_thread_flag(TIF_RESTOREALL);
return 0;
@ -1161,7 +1108,7 @@ int sys_debug_setcontext(struct ucontext __user *ctx,
* always done it up until now so it is probably better not to
* change it. -- paulus
*/
do_sigaltstack(&ctx->uc_stack, NULL, regs->gpr[1]);
restore_altstack(&ctx->uc_stack);
set_thread_flag(TIF_RESTOREALL);
out:

11
arch/powerpc/kernel/signal_64.c
View File

@ -368,10 +368,8 @@ int sys_rt_sigreturn(unsigned long r3, unsigned long r4, unsigned long r5,
if (restore_sigcontext(regs, NULL, 1, &uc->uc_mcontext))
goto badframe;
/* do_sigaltstack expects a __user pointer and won't modify
* what's in there anyway
*/
do_sigaltstack(&uc->uc_stack, NULL, regs->gpr[1]);
if (restore_altstack(&uc->uc_stack))
goto badframe;
set_thread_flag(TIF_RESTOREALL);
return 0;
@ -416,10 +414,7 @@ int handle_rt_signal64(int signr, struct k_sigaction *ka, siginfo_t *info,
/* Create the ucontext. */
err |= __put_user(0, &frame->uc.uc_flags);
err |= __put_user(0, &frame->uc.uc_link);
err |= __put_user(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
err |= __put_user(sas_ss_flags(regs->gpr[1]),
&frame->uc.uc_stack.ss_flags);
err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
err |= __save_altstack(&frame->uc.uc_stack, regs->gpr[1]);
err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, signr, NULL,
(unsigned long)ka->sa.sa_handler, 1);
err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));