mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-14 12:37:32 +00:00
96a68b14db
Our sigreturn functions make use of a macro named nabi_no_regargs to declare 8 dummy arguments to a function, forcing the compiler to expect a pt_regs structure on the stack rather than in argument registers. This is an ugly hack which unnecessarily causes these sigreturn functions to need to care about the calling convention of the ABI the kernel is built for. Although this is abstracted via nabi_no_regargs, it's still ugly & unnecessary. Remove nabi_no_regargs & the struct pt_regs argument from sigreturn functions, and instead use current_pt_regs() to find the struct pt_regs on the stack, which works cleanly regardless of ABI. Signed-off-by: Paul Burton <paul.burton@mips.com> Patchwork: https://patchwork.linux-mips.org/patch/20106/ Cc: James Hogan <jhogan@kernel.org> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: linux-mips@linux-mips.org
162 lines
4.5 KiB
C
162 lines
4.5 KiB
C
/*
|
|
* Copyright (C) 2003 Broadcom Corporation
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version 2
|
|
* of the License, or (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
|
*/
|
|
#include <linux/cache.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/smp.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/signal.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/wait.h>
|
|
#include <linux/ptrace.h>
|
|
#include <linux/unistd.h>
|
|
#include <linux/compat.h>
|
|
#include <linux/bitops.h>
|
|
|
|
#include <asm/abi.h>
|
|
#include <asm/asm.h>
|
|
#include <asm/cacheflush.h>
|
|
#include <asm/compat-signal.h>
|
|
#include <asm/sim.h>
|
|
#include <linux/uaccess.h>
|
|
#include <asm/ucontext.h>
|
|
#include <asm/fpu.h>
|
|
#include <asm/cpu-features.h>
|
|
#include <asm/war.h>
|
|
|
|
#include "signal-common.h"
|
|
|
|
/*
|
|
* Including <asm/unistd.h> would give use the 64-bit syscall numbers ...
|
|
*/
|
|
#define __NR_N32_restart_syscall 6214
|
|
|
|
extern int setup_sigcontext(struct pt_regs *, struct sigcontext __user *);
|
|
extern int restore_sigcontext(struct pt_regs *, struct sigcontext __user *);
|
|
|
|
struct ucontextn32 {
|
|
u32 uc_flags;
|
|
s32 uc_link;
|
|
compat_stack_t uc_stack;
|
|
struct sigcontext uc_mcontext;
|
|
compat_sigset_t uc_sigmask; /* mask last for extensibility */
|
|
};
|
|
|
|
struct rt_sigframe_n32 {
|
|
u32 rs_ass[4]; /* argument save space for o32 */
|
|
u32 rs_pad[2]; /* Was: signal trampoline */
|
|
struct compat_siginfo rs_info;
|
|
struct ucontextn32 rs_uc;
|
|
};
|
|
|
|
asmlinkage void sysn32_rt_sigreturn(void)
|
|
{
|
|
struct rt_sigframe_n32 __user *frame;
|
|
struct pt_regs *regs;
|
|
sigset_t set;
|
|
int sig;
|
|
|
|
regs = current_pt_regs();
|
|
frame = (struct rt_sigframe_n32 __user *)regs->regs[29];
|
|
if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
|
|
goto badframe;
|
|
if (__copy_conv_sigset_from_user(&set, &frame->rs_uc.uc_sigmask))
|
|
goto badframe;
|
|
|
|
set_current_blocked(&set);
|
|
|
|
sig = restore_sigcontext(regs, &frame->rs_uc.uc_mcontext);
|
|
if (sig < 0)
|
|
goto badframe;
|
|
else if (sig)
|
|
force_sig(sig, current);
|
|
|
|
if (compat_restore_altstack(&frame->rs_uc.uc_stack))
|
|
goto badframe;
|
|
|
|
/*
|
|
* Don't let your children do this ...
|
|
*/
|
|
__asm__ __volatile__(
|
|
"move\t$29, %0\n\t"
|
|
"j\tsyscall_exit"
|
|
: /* no outputs */
|
|
: "r" (regs));
|
|
/* Unreached */
|
|
|
|
badframe:
|
|
force_sig(SIGSEGV, current);
|
|
}
|
|
|
|
static int setup_rt_frame_n32(void *sig_return, struct ksignal *ksig,
|
|
struct pt_regs *regs, sigset_t *set)
|
|
{
|
|
struct rt_sigframe_n32 __user *frame;
|
|
int err = 0;
|
|
|
|
frame = get_sigframe(ksig, regs, sizeof(*frame));
|
|
if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
|
|
return -EFAULT;
|
|
|
|
/* Create siginfo. */
|
|
err |= copy_siginfo_to_user32(&frame->rs_info, &ksig->info);
|
|
|
|
/* Create the ucontext. */
|
|
err |= __put_user(0, &frame->rs_uc.uc_flags);
|
|
err |= __put_user(0, &frame->rs_uc.uc_link);
|
|
err |= __compat_save_altstack(&frame->rs_uc.uc_stack, regs->regs[29]);
|
|
err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext);
|
|
err |= __copy_conv_sigset_to_user(&frame->rs_uc.uc_sigmask, set);
|
|
|
|
if (err)
|
|
return -EFAULT;
|
|
|
|
/*
|
|
* Arguments to signal handler:
|
|
*
|
|
* a0 = signal number
|
|
* a1 = 0 (should be cause)
|
|
* a2 = pointer to ucontext
|
|
*
|
|
* $25 and c0_epc point to the signal handler, $29 points to
|
|
* the struct rt_sigframe.
|
|
*/
|
|
regs->regs[ 4] = ksig->sig;
|
|
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) sig_return;
|
|
regs->cp0_epc = regs->regs[25] = (unsigned long) ksig->ka.sa.sa_handler;
|
|
|
|
DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n",
|
|
current->comm, current->pid,
|
|
frame, regs->cp0_epc, regs->regs[31]);
|
|
|
|
return 0;
|
|
}
|
|
|
|
struct mips_abi mips_abi_n32 = {
|
|
.setup_rt_frame = setup_rt_frame_n32,
|
|
.restart = __NR_N32_restart_syscall,
|
|
|
|
.off_sc_fpregs = offsetof(struct sigcontext, sc_fpregs),
|
|
.off_sc_fpc_csr = offsetof(struct sigcontext, sc_fpc_csr),
|
|
.off_sc_used_math = offsetof(struct sigcontext, sc_used_math),
|
|
|
|
.vdso = &vdso_image_n32,
|
|
};
|