From 0430f2f2764f9db5ee5200c3d24d1eac8a797e28 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Sun, 23 Dec 2012 03:54:43 -0500
Subject: [PATCH] xtensa: switch to generic sigaltstack
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
arch/xtensa/Kconfig | 1 +
arch/xtensa/include/asm/syscall.h | 1 -
arch/xtensa/include/uapi/asm/unistd.h | 2 +-
arch/xtensa/kernel/signal.c | 18 ++----------------
4 files changed, 4 insertions(+), 18 deletions(-)
diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig
index 5aab1acabf1c..23cc6ae35da0 100644
--- a/arch/xtensa/Kconfig
+++ b/arch/xtensa/Kconfig
@@ -16,6 +16,7 @@ config XTENSA
select ARCH_WANT_OPTIONAL_GPIOLIB
select CLONE_BACKWARDS
select IRQ_DOMAIN
+ select GENERIC_SIGALTSTACK
help
Xtensa processors are 32-bit RISC machines designed by Tensilica
primarily for embedded systems. These processors are both
diff --git a/arch/xtensa/include/asm/syscall.h b/arch/xtensa/include/asm/syscall.h
index 08a23ddac295..3673ff1f1bc5 100644
--- a/arch/xtensa/include/asm/syscall.h
+++ b/arch/xtensa/include/asm/syscall.h
@@ -12,7 +12,6 @@ struct pt_regs;
asmlinkage long xtensa_ptrace(long, long, long, long);
asmlinkage long xtensa_sigreturn(struct pt_regs*);
asmlinkage long xtensa_rt_sigreturn(struct pt_regs*);
-asmlinkage long xtensa_sigaltstack(struct pt_regs *regs);
asmlinkage long xtensa_shmat(int, char __user *, int);
asmlinkage long xtensa_fadvise64_64(int, int,
unsigned long long, unsigned long long);
diff --git a/arch/xtensa/include/uapi/asm/unistd.h b/arch/xtensa/include/uapi/asm/unistd.h
index 5162418c5d90..19fac3f543a2 100644
--- a/arch/xtensa/include/uapi/asm/unistd.h
+++ b/arch/xtensa/include/uapi/asm/unistd.h
@@ -483,7 +483,7 @@ __SYSCALL(222, sys_ni_syscall, 0)
#define __NR_restart_syscall 223
__SYSCALL(223, sys_restart_syscall, 0)
#define __NR_sigaltstack 224
-__SYSCALL(224, xtensa_sigaltstack, 2)
+__SYSCALL(224, sys_sigaltstack, 2)
#define __NR_rt_sigreturn 225
__SYSCALL(225, xtensa_rt_sigreturn, 1)
#define __NR_rt_sigaction 226
diff --git a/arch/xtensa/kernel/signal.c b/arch/xtensa/kernel/signal.c
index de34d6be91cd..d7590dddd084 100644
--- a/arch/xtensa/kernel/signal.c
+++ b/arch/xtensa/kernel/signal.c
@@ -265,7 +265,7 @@ asmlinkage long xtensa_rt_sigreturn(long a0, long a1, long a2, long a3,
ret = regs->areg[2];
- if (do_sigaltstack(&frame->uc.uc_stack, NULL, regs->areg[1]) == -EFAULT)
+ if (restore_altstack(&frame->uc.uc_stack))
goto badframe;
return ret;
@@ -368,11 +368,7 @@ static int setup_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
err |= __put_user(0, &frame->uc.uc_flags);
err |= __put_user(0, &frame->uc.uc_link);
- err |= __put_user((void *)current->sas_ss_sp,
- &frame->uc.uc_stack.ss_sp);
- err |= __put_user(sas_ss_flags(regs->areg[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->areg[1]);
err |= setup_sigcontext(frame, regs);
err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
@@ -424,16 +420,6 @@ static int setup_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
return -EFAULT;
}
-asmlinkage long xtensa_sigaltstack(const stack_t __user *uss,
- stack_t __user *uoss,
- long a2, long a3, long a4, long a5,
- struct pt_regs *regs)
-{
- return do_sigaltstack(uss, uoss, regs->areg[1]);
-}
-
-
-
/*
* Note that 'init' is a special process: it doesn't get signals it doesn't
* want to handle. Thus you cannot kill init even with a SIGKILL even by
--
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