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Message-Id: <E1Qu7zD-0007zK-TP@ZenIV.linux.org.uk>
Date: Thu, 18 Aug 2011 20:10:39 +0100
From: Al Viro <viro@....linux.org.uk>
To: richard@....at
Cc: user-mode-linux-devel@...ts.sourceforge.net,
linux-kernel@...r.kernel.org
Subject: Subject: [PATCH 70/91] um: merge signal_{32,64}.c
Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
---
arch/x86/um/Makefile | 2 +-
arch/x86/um/asm/ptrace_64.h | 2 +-
arch/x86/um/{signal_32.c => signal.c} | 223 ++++++++++++++++++++++++++-----
arch/x86/um/signal_64.c | 236 ---------------------------------
arch/x86/um/sys_call_table_32.S | 2 -
arch/x86/um/sysrq_64.c | 2 +-
6 files changed, 189 insertions(+), 278 deletions(-)
rename arch/x86/um/{signal_32.c => signal.c} (72%)
delete mode 100644 arch/x86/um/signal_64.c
diff --git a/arch/x86/um/Makefile b/arch/x86/um/Makefile
index df41989..ffe1008 100644
--- a/arch/x86/um/Makefile
+++ b/arch/x86/um/Makefile
@@ -9,7 +9,7 @@ else
endif
obj-y = bug.o bugs_$(BITS).o delay_$(BITS).o fault.o ksyms.o ldt.o \
- ptrace_$(BITS).o ptrace_user.o setjmp_$(BITS).o signal_$(BITS).o \
+ ptrace_$(BITS).o ptrace_user.o setjmp_$(BITS).o signal.o \
stub_$(BITS).o stub_segv.o syscalls_$(BITS).o \
sys_call_table_$(BITS).o sysrq_$(BITS).o tls_$(BITS).o \
mem_$(BITS).o subarch.o os-$(OS)/
diff --git a/arch/x86/um/asm/ptrace_64.h b/arch/x86/um/asm/ptrace_64.h
index 83d8c47..706a0d8 100644
--- a/arch/x86/um/asm/ptrace_64.h
+++ b/arch/x86/um/asm/ptrace_64.h
@@ -40,7 +40,7 @@
#define PT_REGS_ORIG_RAX(r) UPT_ORIG_RAX(&(r)->regs)
#define PT_REGS_RIP(r) UPT_IP(&(r)->regs)
-#define PT_REGS_RSP(r) UPT_SP(&(r)->regs)
+#define PT_REGS_SP(r) UPT_SP(&(r)->regs)
#define PT_REGS_EFLAGS(r) UPT_EFLAGS(&(r)->regs)
diff --git a/arch/x86/um/signal_32.c b/arch/x86/um/signal.c
similarity index 72%
rename from arch/x86/um/signal_32.c
rename to arch/x86/um/signal.c
index 7a206d8..4883b95 100644
--- a/arch/x86/um/signal_32.c
+++ b/arch/x86/um/signal.c
@@ -1,15 +1,21 @@
/*
- * Copyright (C) 2004 - 2007 Jeff Dike (jdike@...dtoit,linux.intel}.com)
+ * Copyright (C) 2003 PathScale, Inc.
+ * Copyright (C) 2003 - 2007 Jeff Dike (jdike@...dtoit,linux.intel}.com)
* Licensed under the GPL
*/
+
+#include <linux/personality.h>
#include <linux/ptrace.h>
+#include <linux/kernel.h>
#include <asm/unistd.h>
#include <asm/uaccess.h>
#include <asm/ucontext.h>
#include "frame_kern.h"
#include "skas.h"
+#ifdef CONFIG_X86_32
+
/*
* FPU tag word conversions.
*/
@@ -142,6 +148,8 @@ static int convert_fxsr_from_user(struct user_fxsr_struct *fxsave,
extern int have_fpx_regs;
+#endif
+
static int copy_sc_from_user(struct pt_regs *regs,
struct sigcontext __user *from)
{
@@ -152,14 +160,14 @@ static int copy_sc_from_user(struct pt_regs *regs,
if (err)
return err;
- pid = userspace_pid[current_thread_info()->cpu];
-
#define GETREG(regno, regname) regs->regs.gp[HOST_##regno] = sc.regname
+#ifdef CONFIG_X86_32
GETREG(GS, gs);
GETREG(FS, fs);
GETREG(ES, es);
GETREG(DS, ds);
+#endif
GETREG(DI, di);
GETREG(SI, si);
GETREG(BP, bp);
@@ -169,11 +177,28 @@ static int copy_sc_from_user(struct pt_regs *regs,
GETREG(CX, cx);
GETREG(AX, ax);
GETREG(IP, ip);
+
+#ifdef CONFIG_X86_64
+ GETREG(R8, r8);
+ GETREG(R9, r9);
+ GETREG(R10, r10);
+ GETREG(R11, r11);
+ GETREG(R12, r12);
+ GETREG(R13, r13);
+ GETREG(R14, r14);
+ GETREG(R15, r15);
+#endif
+
GETREG(CS, cs);
GETREG(EFLAGS, flags);
+#ifdef CONFIG_X86_32
GETREG(SS, ss);
+#endif
#undef GETREG
+
+ pid = userspace_pid[current_thread_info()->cpu];
+#ifdef CONFIG_X86_32
if (have_fpx_regs) {
struct user_fxsr_struct fpx;
@@ -194,7 +219,9 @@ static int copy_sc_from_user(struct pt_regs *regs,
-err);
return 1;
}
- } else {
+ } else
+#endif
+ {
struct user_i387_struct fp;
err = copy_from_user(&fp, sc.fpstate,
@@ -210,43 +237,66 @@ static int copy_sc_from_user(struct pt_regs *regs,
return 1;
}
}
-
return 0;
}
static int copy_sc_to_user(struct sigcontext __user *to,
- struct _fpstate __user *to_fp, struct pt_regs *regs)
+ struct _fpstate __user *to_fp, struct pt_regs *regs,
+ unsigned long mask)
{
struct sigcontext sc;
struct faultinfo * fi = ¤t->thread.arch.faultinfo;
int err, pid;
memset(&sc, 0, sizeof(struct sigcontext));
- sc.gs = REGS_GS(regs->regs.gp);
- sc.fs = REGS_FS(regs->regs.gp);
- sc.es = REGS_ES(regs->regs.gp);
- sc.ds = REGS_DS(regs->regs.gp);
- sc.di = REGS_EDI(regs->regs.gp);
- sc.si = REGS_ESI(regs->regs.gp);
- sc.bp = REGS_EBP(regs->regs.gp);
- sc.sp = REGS_SP(regs->regs.gp);
- sc.bx = REGS_EBX(regs->regs.gp);
- sc.dx = REGS_EDX(regs->regs.gp);
- sc.cx = REGS_ECX(regs->regs.gp);
- sc.ax = REGS_EAX(regs->regs.gp);
- sc.ip = REGS_IP(regs->regs.gp);
- sc.cs = REGS_CS(regs->regs.gp);
- sc.flags = REGS_EFLAGS(regs->regs.gp);
- sc.sp_at_signal = regs->regs.gp[UESP];
- sc.ss = regs->regs.gp[SS];
+#define PUTREG(regno, regname) sc.regname = regs->regs.gp[HOST_##regno]
+
+#ifdef CONFIG_X86_32
+ PUTREG(GS, gs);
+ PUTREG(FS, fs);
+ PUTREG(ES, es);
+ PUTREG(DS, ds);
+#endif
+ PUTREG(DI, di);
+ PUTREG(SI, si);
+ PUTREG(BP, bp);
+ PUTREG(SP, sp);
+ PUTREG(BX, bx);
+ PUTREG(DX, dx);
+ PUTREG(CX, cx);
+ PUTREG(AX, ax);
+#ifdef CONFIG_X86_64
+ PUTREG(R8, r8);
+ PUTREG(R9, r9);
+ PUTREG(R10, r10);
+ PUTREG(R11, r11);
+ PUTREG(R12, r12);
+ PUTREG(R13, r13);
+ PUTREG(R14, r14);
+ PUTREG(R15, r15);
+#endif
+
sc.cr2 = fi->cr2;
sc.err = fi->error_code;
sc.trapno = fi->trap_no;
-
- to_fp = (to_fp ? to_fp : (struct _fpstate __user *) (to + 1));
+ PUTREG(IP, ip);
+ PUTREG(CS, cs);
+ PUTREG(EFLAGS, flags);
+#ifdef CONFIG_X86_32
+ PUTREG(SP, sp_at_signal);
+ PUTREG(SS, ss);
+#endif
+#undef PUTREG
+ sc.oldmask = mask;
sc.fpstate = to_fp;
+ err = copy_to_user(to, &sc, sizeof(struct sigcontext));
+ if (err)
+ return 1;
+
pid = userspace_pid[current_thread_info()->cpu];
+
+#ifdef CONFIG_X86_32
if (have_fpx_regs) {
struct user_fxsr_struct fpx;
@@ -269,8 +319,9 @@ static int copy_sc_to_user(struct sigcontext __user *to,
if (copy_to_user(&to_fp->_fxsr_env[0], &fpx,
sizeof(struct user_fxsr_struct)))
return 1;
- }
- else {
+ } else
+#endif
+ {
struct user_i387_struct fp;
err = save_fp_registers(pid, (unsigned long *) &fp);
@@ -278,9 +329,10 @@ static int copy_sc_to_user(struct sigcontext __user *to,
return 1;
}
- return copy_to_user(to, &sc, sizeof(sc));
+ return 0;
}
+#ifdef CONFIG_X86_32
static int copy_ucontext_to_user(struct ucontext __user *uc,
struct _fpstate __user *fp, sigset_t *set,
unsigned long sp)
@@ -290,7 +342,7 @@ static int copy_ucontext_to_user(struct ucontext __user *uc,
err |= put_user(current->sas_ss_sp, &uc->uc_stack.ss_sp);
err |= put_user(sas_ss_flags(sp), &uc->uc_stack.ss_flags);
err |= put_user(current->sas_ss_size, &uc->uc_stack.ss_size);
- err |= copy_sc_to_user(&uc->uc_mcontext, fp, ¤t->thread.regs);
+ err |= copy_sc_to_user(&uc->uc_mcontext, fp, ¤t->thread.regs, 0);
err |= copy_to_user(&uc->uc_sigmask, set, sizeof(*set));
return err;
}
@@ -337,8 +389,7 @@ int setup_signal_stack_sc(unsigned long stack_top, int sig,
err |= __put_user(restorer, &frame->pretcode);
err |= __put_user(sig, &frame->sig);
- err |= copy_sc_to_user(&frame->sc, NULL, regs);
- err |= __put_user(mask->sig[0], &frame->sc.oldmask);
+ err |= copy_sc_to_user(&frame->sc, &frame->fpstate, regs, mask->sig[0]);
if (_NSIG_WORDS > 1)
err |= __copy_to_user(&frame->extramask, &mask->sig[1],
sizeof(frame->extramask));
@@ -418,7 +469,7 @@ int setup_signal_stack_si(unsigned long stack_top, int sig,
return 0;
}
-long sys_sigreturn(struct pt_regs regs)
+long sys_sigreturn(struct pt_regs *regs)
{
unsigned long sp = PT_REGS_SP(¤t->thread.regs);
struct sigframe __user *frame = (struct sigframe __user *)(sp - 8);
@@ -447,16 +498,103 @@ long sys_sigreturn(struct pt_regs regs)
return 0;
}
-long sys_rt_sigreturn(struct pt_regs regs)
+#else
+
+struct rt_sigframe
+{
+ char __user *pretcode;
+ struct ucontext uc;
+ struct siginfo info;
+ struct _fpstate fpstate;
+};
+
+int setup_signal_stack_si(unsigned long stack_top, int sig,
+ struct k_sigaction *ka, struct pt_regs * regs,
+ siginfo_t *info, sigset_t *set)
+{
+ struct rt_sigframe __user *frame;
+ int err = 0;
+ struct task_struct *me = current;
+
+ frame = (struct rt_sigframe __user *)
+ round_down(stack_top - sizeof(struct rt_sigframe), 16);
+ /* Subtract 128 for a red zone and 8 for proper alignment */
+ frame = (struct rt_sigframe __user *) ((unsigned long) frame - 128 - 8);
+
+ if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
+ goto out;
+
+ if (ka->sa.sa_flags & SA_SIGINFO) {
+ err |= copy_siginfo_to_user(&frame->info, info);
+ if (err)
+ goto out;
+ }
+
+ /* Create the ucontext. */
+ err |= __put_user(0, &frame->uc.uc_flags);
+ err |= __put_user(0, &frame->uc.uc_link);
+ err |= __put_user(me->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
+ err |= __put_user(sas_ss_flags(PT_REGS_SP(regs)),
+ &frame->uc.uc_stack.ss_flags);
+ err |= __put_user(me->sas_ss_size, &frame->uc.uc_stack.ss_size);
+ err |= copy_sc_to_user(&frame->uc.uc_mcontext, &frame->fpstate, regs,
+ set->sig[0]);
+ err |= __put_user(&frame->fpstate, &frame->uc.uc_mcontext.fpstate);
+ if (sizeof(*set) == 16) {
+ __put_user(set->sig[0], &frame->uc.uc_sigmask.sig[0]);
+ __put_user(set->sig[1], &frame->uc.uc_sigmask.sig[1]);
+ }
+ else
+ err |= __copy_to_user(&frame->uc.uc_sigmask, set,
+ sizeof(*set));
+
+ /*
+ * Set up to return from userspace. If provided, use a stub
+ * already in userspace.
+ */
+ /* x86-64 should always use SA_RESTORER. */
+ if (ka->sa.sa_flags & SA_RESTORER)
+ err |= __put_user(ka->sa.sa_restorer, &frame->pretcode);
+ else
+ /* could use a vstub here */
+ return err;
+
+ if (err)
+ return err;
+
+ /* Set up registers for signal handler */
+ {
+ struct exec_domain *ed = current_thread_info()->exec_domain;
+ if (unlikely(ed && ed->signal_invmap && sig < 32))
+ sig = ed->signal_invmap[sig];
+ }
+
+ PT_REGS_SP(regs) = (unsigned long) frame;
+ PT_REGS_RDI(regs) = sig;
+ /* In case the signal handler was declared without prototypes */
+ PT_REGS_RAX(regs) = 0;
+
+ /*
+ * This also works for non SA_SIGINFO handlers because they expect the
+ * next argument after the signal number on the stack.
+ */
+ PT_REGS_RSI(regs) = (unsigned long) &frame->info;
+ PT_REGS_RDX(regs) = (unsigned long) &frame->uc;
+ PT_REGS_RIP(regs) = (unsigned long) ka->sa.sa_handler;
+ out:
+ return err;
+}
+#endif
+
+long sys_rt_sigreturn(struct pt_regs *regs)
{
unsigned long sp = PT_REGS_SP(¤t->thread.regs);
struct rt_sigframe __user *frame =
- (struct rt_sigframe __user *) (sp - 4);
- sigset_t set;
+ (struct rt_sigframe __user *)(sp - sizeof(long));
struct ucontext __user *uc = &frame->uc;
- int sig_size = _NSIG_WORDS * sizeof(unsigned long);
+ sigset_t set;
- if (copy_from_user(&set, &uc->uc_sigmask, sig_size))
+ if (copy_from_user(&set, &uc->uc_sigmask, sizeof(set)))
goto segfault;
sigdelsetmask(&set, ~_BLOCKABLE);
@@ -473,3 +611,14 @@ long sys_rt_sigreturn(struct pt_regs regs)
force_sig(SIGSEGV, current);
return 0;
}
+
+#ifdef CONFIG_X86_32
+long ptregs_sigreturn(void)
+{
+ return sys_sigreturn(NULL);
+}
+long ptregs_rt_sigreturn(void)
+{
+ return sys_rt_sigreturn(NULL);
+}
+#endif
diff --git a/arch/x86/um/signal_64.c b/arch/x86/um/signal_64.c
deleted file mode 100644
index 74c2598..0000000
--- a/arch/x86/um/signal_64.c
+++ /dev/null
@@ -1,236 +0,0 @@
-/*
- * Copyright (C) 2003 PathScale, Inc.
- * Copyright (C) 2003 - 2007 Jeff Dike (jdike@...dtoit,linux.intel}.com)
- * Licensed under the GPL
- */
-
-#include <linux/personality.h>
-#include <linux/ptrace.h>
-#include <linux/kernel.h>
-#include <asm/unistd.h>
-#include <asm/uaccess.h>
-#include <asm/ucontext.h>
-#include "frame_kern.h"
-#include "skas.h"
-
-static int copy_sc_from_user(struct pt_regs *regs,
- struct sigcontext __user *from)
-{
- struct sigcontext sc;
- struct user_i387_struct fp;
- void __user *buf;
- int err;
-
- err = copy_from_user(&sc, from, sizeof(sc));
- if (err)
- return err;
-
-#define GETREG(regno, regname) regs->regs.gp[HOST_##regno] = sc.regname
-
- GETREG(R8, r8);
- GETREG(R9, r9);
- GETREG(R10, r10);
- GETREG(R11, r11);
- GETREG(R12, r12);
- GETREG(R13, r13);
- GETREG(R14, r14);
- GETREG(R15, r15);
- GETREG(DI, di);
- GETREG(SI, si);
- GETREG(BP, bp);
- GETREG(BX, bx);
- GETREG(DX, dx);
- GETREG(AX, ax);
- GETREG(CX, cx);
- GETREG(SP, sp);
- GETREG(IP, ip);
- GETREG(EFLAGS, flags);
- GETREG(CS, cs);
-#undef GETREG
-
- buf = sc.fpstate;
-
- err = copy_from_user(&fp, buf, sizeof(struct user_i387_struct));
- if (err)
- return 1;
-
- err = restore_fp_registers(userspace_pid[current_thread_info()->cpu],
- (unsigned long *) &fp);
- if (err < 0) {
- printk(KERN_ERR "copy_sc_from_user - "
- "restore_fp_registers failed, errno = %d\n",
- -err);
- return 1;
- }
-
- return 0;
-}
-
-static int copy_sc_to_user(struct sigcontext __user *to,
- struct _fpstate __user *to_fp, struct pt_regs *regs,
- unsigned long mask)
-{
- struct faultinfo * fi = ¤t->thread.arch.faultinfo;
- struct sigcontext sc;
- struct user_i387_struct fp;
- int err = 0;
- memset(&sc, 0, sizeof(struct sigcontext));
-
-#define PUTREG(regno, regname) sc.regname = regs->regs.gp[HOST_##regno]
-
- PUTREG(DI, di);
- PUTREG(SI, si);
- PUTREG(BP, bp);
- PUTREG(SP, sp);
- PUTREG(BX, bx);
- PUTREG(DX, dx);
- PUTREG(CX, cx);
- PUTREG(AX, ax);
- PUTREG(R8, r8);
- PUTREG(R9, r9);
- PUTREG(R10, r10);
- PUTREG(R11, r11);
- PUTREG(R12, r12);
- PUTREG(R13, r13);
- PUTREG(R14, r14);
- PUTREG(R15, r15);
- PUTREG(CS, cs); /* XXX x86_64 doesn't do this */
-
- sc.cr2 = fi->cr2;
- sc.err = fi->error_code;
- sc.trapno = fi->trap_no;
-
- PUTREG(IP, ip);
- PUTREG(EFLAGS, flags);
-#undef PUTREG
-
- sc.oldmask = mask;
-
- err = copy_to_user(to, &sc, sizeof(struct sigcontext));
- if (err)
- return 1;
-
- err = save_fp_registers(userspace_pid[current_thread_info()->cpu],
- (unsigned long *) &fp);
- if (err < 0) {
- printk(KERN_ERR "copy_sc_from_user - restore_fp_registers "
- "failed, errno = %d\n", -err);
- return 1;
- }
-
- if (copy_to_user(to_fp, &fp, sizeof(struct user_i387_struct)))
- return 1;
-
- return err;
-}
-
-struct rt_sigframe
-{
- char __user *pretcode;
- struct ucontext uc;
- struct siginfo info;
- struct _fpstate fpstate;
-};
-
-int setup_signal_stack_si(unsigned long stack_top, int sig,
- struct k_sigaction *ka, struct pt_regs * regs,
- siginfo_t *info, sigset_t *set)
-{
- struct rt_sigframe __user *frame;
- int err = 0;
- struct task_struct *me = current;
-
- frame = (struct rt_sigframe __user *)
- round_down(stack_top - sizeof(struct rt_sigframe), 16);
- /* Subtract 128 for a red zone and 8 for proper alignment */
- frame = (struct rt_sigframe __user *) ((unsigned long) frame - 128 - 8);
-
- if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
- goto out;
-
- if (ka->sa.sa_flags & SA_SIGINFO) {
- err |= copy_siginfo_to_user(&frame->info, info);
- if (err)
- goto out;
- }
-
- /* Create the ucontext. */
- err |= __put_user(0, &frame->uc.uc_flags);
- err |= __put_user(0, &frame->uc.uc_link);
- err |= __put_user(me->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
- err |= __put_user(sas_ss_flags(PT_REGS_RSP(regs)),
- &frame->uc.uc_stack.ss_flags);
- err |= __put_user(me->sas_ss_size, &frame->uc.uc_stack.ss_size);
- err |= copy_sc_to_user(&frame->uc.uc_mcontext, &frame->fpstate, regs,
- set->sig[0]);
- err |= __put_user(&frame->fpstate, &frame->uc.uc_mcontext.fpstate);
- if (sizeof(*set) == 16) {
- __put_user(set->sig[0], &frame->uc.uc_sigmask.sig[0]);
- __put_user(set->sig[1], &frame->uc.uc_sigmask.sig[1]);
- }
- else
- err |= __copy_to_user(&frame->uc.uc_sigmask, set,
- sizeof(*set));
-
- /*
- * Set up to return from userspace. If provided, use a stub
- * already in userspace.
- */
- /* x86-64 should always use SA_RESTORER. */
- if (ka->sa.sa_flags & SA_RESTORER)
- err |= __put_user(ka->sa.sa_restorer, &frame->pretcode);
- else
- /* could use a vstub here */
- return err;
-
- if (err)
- return err;
-
- /* Set up registers for signal handler */
- {
- struct exec_domain *ed = current_thread_info()->exec_domain;
- if (unlikely(ed && ed->signal_invmap && sig < 32))
- sig = ed->signal_invmap[sig];
- }
-
- PT_REGS_RSP(regs) = (unsigned long) frame;
- PT_REGS_RDI(regs) = sig;
- /* In case the signal handler was declared without prototypes */
- PT_REGS_RAX(regs) = 0;
-
- /*
- * This also works for non SA_SIGINFO handlers because they expect the
- * next argument after the signal number on the stack.
- */
- PT_REGS_RSI(regs) = (unsigned long) &frame->info;
- PT_REGS_RDX(regs) = (unsigned long) &frame->uc;
- PT_REGS_RIP(regs) = (unsigned long) ka->sa.sa_handler;
- out:
- return err;
-}
-
-long sys_rt_sigreturn(struct pt_regs *regs)
-{
- unsigned long sp = PT_REGS_SP(¤t->thread.regs);
- struct rt_sigframe __user *frame =
- (struct rt_sigframe __user *)(sp - 8);
- struct ucontext __user *uc = &frame->uc;
- sigset_t set;
-
- if (copy_from_user(&set, &uc->uc_sigmask, sizeof(set)))
- goto segfault;
-
- sigdelsetmask(&set, ~_BLOCKABLE);
- set_current_blocked(&set);
-
- if (copy_sc_from_user(¤t->thread.regs, &uc->uc_mcontext))
- goto segfault;
-
- /* Avoid ERESTART handling */
- PT_REGS_SYSCALL_NR(¤t->thread.regs) = -1;
- return PT_REGS_SYSCALL_RET(¤t->thread.regs);
-
- segfault:
- force_sig(SIGSEGV, current);
- return 0;
-}
diff --git a/arch/x86/um/sys_call_table_32.S b/arch/x86/um/sys_call_table_32.S
index c3431cf..a7ca80d 100644
--- a/arch/x86/um/sys_call_table_32.S
+++ b/arch/x86/um/sys_call_table_32.S
@@ -13,10 +13,8 @@
#define ptregs_execve sys_execve
#define ptregs_iopl sys_iopl
#define ptregs_vm86old sys_vm86old
-#define ptregs_sigreturn sys_sigreturn
#define ptregs_clone sys_clone
#define ptregs_vm86 sys_vm86
-#define ptregs_rt_sigreturn sys_rt_sigreturn
#define ptregs_sigaltstack sys_sigaltstack
#define ptregs_vfork sys_vfork
diff --git a/arch/x86/um/sysrq_64.c b/arch/x86/um/sysrq_64.c
index f4f82be..e891343 100644
--- a/arch/x86/um/sysrq_64.c
+++ b/arch/x86/um/sysrq_64.c
@@ -20,7 +20,7 @@ void __show_regs(struct pt_regs *regs)
current->comm, print_tainted(), init_utsname()->release);
printk(KERN_INFO "RIP: %04lx:[<%016lx>]\n", PT_REGS_CS(regs) & 0xffff,
PT_REGS_RIP(regs));
- printk(KERN_INFO "RSP: %016lx EFLAGS: %08lx\n", PT_REGS_RSP(regs),
+ printk(KERN_INFO "RSP: %016lx EFLAGS: %08lx\n", PT_REGS_SP(regs),
PT_REGS_EFLAGS(regs));
printk(KERN_INFO "RAX: %016lx RBX: %016lx RCX: %016lx\n",
PT_REGS_RAX(regs), PT_REGS_RBX(regs), PT_REGS_RCX(regs));
--
1.7.2.5
--
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