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um: merge signal_{32,64}.c

Browse source 
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
Al Viro 2011-08-18 20:10:39 +01:00 committed by Richard Weinberger
parent fbe9868693
commit f67aa2ffb7
6 changed files with 189 additions and 278 deletions
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2
arch/x86/um/Makefile
View file

@ -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)/

2
arch/x86/um/asm/ptrace_64.h
View file

@ -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)

223
arch/x86/um/signal_32.c → arch/x86/um/signal.c
View file

@ -1,15 +1,21 @@
/*
* Copyright (C) 2004 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
* Copyright (C) 2003 PathScale, Inc.
* Copyright (C) 2003 - 2007 Jeff Dike (jdike@{addtoit,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 = &current->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, &current->thread.regs);
err |= copy_sc_to_user(&uc->uc_mcontext, fp, &current->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(&current->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(&current->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

236
arch/x86/um/signal_64.c
View file

@ -1,236 +0,0 @@
/*
* Copyright (C) 2003 PathScale, Inc.
* Copyright (C) 2003 - 2007 Jeff Dike (jdike@{addtoit,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 = &current->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(&current->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(&current->thread.regs, &uc->uc_mcontext))
goto segfault;
/* Avoid ERESTART handling */
PT_REGS_SYSCALL_NR(&current->thread.regs) = -1;
return PT_REGS_SYSCALL_RET(&current->thread.regs);
segfault:
force_sig(SIGSEGV, current);
return 0;
}

2
arch/x86/um/sys_call_table_32.S
View file

@ -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

2
arch/x86/um/sysrq_64.c
View file

@ -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));