提交 99b9cdf7 编写于 作者: T Thomas Gleixner 提交者: Ingo Molnar

x86: clean up arch/x86/ia32/ia32_signal.c

White space and coding style clenaup.
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
上级 8edf8bee
......@@ -43,7 +43,8 @@ void signal_fault(struct pt_regs *regs, void __user *frame, char *where);
int copy_siginfo_to_user32(compat_siginfo_t __user *to, siginfo_t *from)
{
int err;
if (!access_ok (VERIFY_WRITE, to, sizeof(compat_siginfo_t)))
if (!access_ok(VERIFY_WRITE, to, sizeof(compat_siginfo_t)))
return -EFAULT;
/* If you change siginfo_t structure, please make sure that
......@@ -53,16 +54,19 @@ int copy_siginfo_to_user32(compat_siginfo_t __user *to, siginfo_t *from)
3 ints plus the relevant union member. */
err = __put_user(from->si_signo, &to->si_signo);
err |= __put_user(from->si_errno, &to->si_errno);
err |= __put_user((short)from->si_code, &to->si_code);
err |= __put_user((short)from->si_code, &to->si_code);
if (from->si_code < 0) {
err |= __put_user(from->si_pid, &to->si_pid);
err |= __put_user(from->si_uid, &to->si_uid);
err |= __put_user(ptr_to_compat(from->si_ptr), &to->si_ptr);
err |= __put_user(from->si_uid, &to->si_uid);
err |= __put_user(ptr_to_compat(from->si_ptr), &to->si_ptr);
} else {
/* First 32bits of unions are always present:
* si_pid === si_band === si_tid === si_addr(LS half) */
err |= __put_user(from->_sifields._pad[0], &to->_sifields._pad[0]);
/*
* First 32bits of unions are always present:
* si_pid === si_band === si_tid === si_addr(LS half)
*/
err |= __put_user(from->_sifields._pad[0],
&to->_sifields._pad[0]);
switch (from->si_code >> 16) {
case __SI_FAULT >> 16:
break;
......@@ -76,14 +80,15 @@ int copy_siginfo_to_user32(compat_siginfo_t __user *to, siginfo_t *from)
err |= __put_user(from->si_uid, &to->si_uid);
break;
case __SI_POLL >> 16:
err |= __put_user(from->si_fd, &to->si_fd);
err |= __put_user(from->si_fd, &to->si_fd);
break;
case __SI_TIMER >> 16:
err |= __put_user(from->si_overrun, &to->si_overrun);
err |= __put_user(from->si_overrun, &to->si_overrun);
err |= __put_user(ptr_to_compat(from->si_ptr),
&to->si_ptr);
&to->si_ptr);
break;
case __SI_RT >> 16: /* This is not generated by the kernel as of now. */
/* This is not generated by the kernel as of now. */
case __SI_RT >> 16:
case __SI_MESGQ >> 16:
err |= __put_user(from->si_uid, &to->si_uid);
err |= __put_user(from->si_int, &to->si_int);
......@@ -97,7 +102,8 @@ int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from)
{
int err;
u32 ptr32;
if (!access_ok (VERIFY_READ, from, sizeof(compat_siginfo_t)))
if (!access_ok(VERIFY_READ, from, sizeof(compat_siginfo_t)))
return -EFAULT;
err = __get_user(to->si_signo, &from->si_signo);
......@@ -112,8 +118,7 @@ int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from)
return err;
}
asmlinkage long
sys32_sigsuspend(int history0, int history1, old_sigset_t mask)
asmlinkage long sys32_sigsuspend(int history0, int history1, old_sigset_t mask)
{
mask &= _BLOCKABLE;
spin_lock_irq(&current->sighand->siglock);
......@@ -128,36 +133,37 @@ sys32_sigsuspend(int history0, int history1, old_sigset_t mask)
return -ERESTARTNOHAND;
}
asmlinkage long
sys32_sigaltstack(const stack_ia32_t __user *uss_ptr,
stack_ia32_t __user *uoss_ptr,
struct pt_regs *regs)
asmlinkage long sys32_sigaltstack(const stack_ia32_t __user *uss_ptr,
stack_ia32_t __user *uoss_ptr,
struct pt_regs *regs)
{
stack_t uss,uoss;
stack_t uss, uoss;
int ret;
mm_segment_t seg;
if (uss_ptr) {
mm_segment_t seg;
if (uss_ptr) {
u32 ptr;
memset(&uss,0,sizeof(stack_t));
if (!access_ok(VERIFY_READ,uss_ptr,sizeof(stack_ia32_t)) ||
memset(&uss, 0, sizeof(stack_t));
if (!access_ok(VERIFY_READ, uss_ptr, sizeof(stack_ia32_t)) ||
__get_user(ptr, &uss_ptr->ss_sp) ||
__get_user(uss.ss_flags, &uss_ptr->ss_flags) ||
__get_user(uss.ss_size, &uss_ptr->ss_size))
return -EFAULT;
uss.ss_sp = compat_ptr(ptr);
}
seg = get_fs();
set_fs(KERNEL_DS);
seg = get_fs();
set_fs(KERNEL_DS);
ret = do_sigaltstack(uss_ptr ? &uss : NULL, &uoss, regs->rsp);
set_fs(seg);
set_fs(seg);
if (ret >= 0 && uoss_ptr) {
if (!access_ok(VERIFY_WRITE,uoss_ptr,sizeof(stack_ia32_t)) ||
if (!access_ok(VERIFY_WRITE, uoss_ptr, sizeof(stack_ia32_t)) ||
__put_user(ptr_to_compat(uoss.ss_sp), &uoss_ptr->ss_sp) ||
__put_user(uoss.ss_flags, &uoss_ptr->ss_flags) ||
__put_user(uoss.ss_size, &uoss_ptr->ss_size))
ret = -EFAULT;
}
return ret;
}
return ret;
}
/*
......@@ -186,18 +192,6 @@ struct rt_sigframe
char retcode[8];
};
static int
ia32_restore_sigcontext(struct pt_regs *regs, struct sigcontext_ia32 __user *sc, unsigned int *peax)
{
unsigned int err = 0;
/* Always make any pending restarted system calls return -EINTR */
current_thread_info()->restart_block.fn = do_no_restart_syscall;
#if DEBUG_SIG
printk("SIG restore_sigcontext: sc=%p err(%x) eip(%x) cs(%x) flg(%x)\n",
sc, sc->err, sc->eip, sc->cs, sc->eflags);
#endif
#define COPY(x) { \
unsigned int reg; \
err |= __get_user(reg, &sc->e ##x); \
......@@ -205,68 +199,78 @@ ia32_restore_sigcontext(struct pt_regs *regs, struct sigcontext_ia32 __user *sc,
}
#define RELOAD_SEG(seg,mask) \
{ unsigned int cur; \
{ unsigned int cur; \
unsigned short pre; \
err |= __get_user(pre, &sc->seg); \
asm volatile("movl %%" #seg ",%0" : "=r" (cur)); \
pre |= mask; \
if (pre != cur) loadsegment(seg,pre); }
/* Reload fs and gs if they have changed in the signal handler.
This does not handle long fs/gs base changes in the handler, but
does not clobber them at least in the normal case. */
{
unsigned gs, oldgs;
err |= __get_user(gs, &sc->gs);
gs |= 3;
asm("movl %%gs,%0" : "=r" (oldgs));
if (gs != oldgs)
load_gs_index(gs);
}
RELOAD_SEG(fs,3);
RELOAD_SEG(ds,3);
RELOAD_SEG(es,3);
asm volatile("movl %%" #seg ",%0" : "=r" (cur)); \
pre |= mask; \
if (pre != cur) loadsegment(seg, pre); }
static int ia32_restore_sigcontext(struct pt_regs *regs,
struct sigcontext_ia32 __user *sc,
unsigned int *peax)
{
unsigned int tmpflags, gs, oldgs, err = 0;
struct _fpstate_ia32 __user *buf;
u32 tmp;
/* Always make any pending restarted system calls return -EINTR */
current_thread_info()->restart_block.fn = do_no_restart_syscall;
#if DEBUG_SIG
printk(KERN_DEBUG "SIG restore_sigcontext: "
"sc=%p err(%x) eip(%x) cs(%x) flg(%x)\n",
sc, sc->err, sc->eip, sc->cs, sc->eflags);
#endif
/*
* Reload fs and gs if they have changed in the signal
* handler. This does not handle long fs/gs base changes in
* the handler, but does not clobber them at least in the
* normal case.
*/
err |= __get_user(gs, &sc->gs);
gs |= 3;
asm("movl %%gs,%0" : "=r" (oldgs));
if (gs != oldgs)
load_gs_index(gs);
RELOAD_SEG(fs, 3);
RELOAD_SEG(ds, 3);
RELOAD_SEG(es, 3);
COPY(di); COPY(si); COPY(bp); COPY(sp); COPY(bx);
COPY(dx); COPY(cx); COPY(ip);
/* Don't touch extended registers */
err |= __get_user(regs->cs, &sc->cs);
regs->cs |= 3;
err |= __get_user(regs->ss, &sc->ss);
regs->ss |= 3;
{
unsigned int tmpflags;
err |= __get_user(tmpflags, &sc->eflags);
regs->eflags = (regs->eflags & ~0x40DD5) | (tmpflags & 0x40DD5);
regs->orig_rax = -1; /* disable syscall checks */
}
/* Don't touch extended registers */
err |= __get_user(regs->cs, &sc->cs);
regs->cs |= 3;
err |= __get_user(regs->ss, &sc->ss);
regs->ss |= 3;
err |= __get_user(tmpflags, &sc->eflags);
regs->eflags = (regs->eflags & ~0x40DD5) | (tmpflags & 0x40DD5);
/* disable syscall checks */
regs->orig_rax = -1;
err |= __get_user(tmp, &sc->fpstate);
buf = compat_ptr(tmp);
if (buf) {
if (!access_ok(VERIFY_READ, buf, sizeof(*buf)))
goto badframe;
err |= restore_i387_ia32(current, buf, 0);
} else {
struct task_struct *me = current;
{
u32 tmp;
struct _fpstate_ia32 __user * buf;
err |= __get_user(tmp, &sc->fpstate);
buf = compat_ptr(tmp);
if (buf) {
if (!access_ok(VERIFY_READ, buf, sizeof(*buf)))
goto badframe;
err |= restore_i387_ia32(current, buf, 0);
} else {
struct task_struct *me = current;
if (used_math()) {
clear_fpu(me);
clear_used_math();
}
if (used_math()) {
clear_fpu(me);
clear_used_math();
}
}
{
u32 tmp;
err |= __get_user(tmp, &sc->eax);
*peax = tmp;
}
err |= __get_user(tmp, &sc->eax);
*peax = tmp;
return err;
badframe:
......@@ -283,7 +287,8 @@ asmlinkage long sys32_sigreturn(struct pt_regs *regs)
goto badframe;
if (__get_user(set.sig[0], &frame->sc.oldmask)
|| (_COMPAT_NSIG_WORDS > 1
&& __copy_from_user((((char *) &set.sig) + 4), &frame->extramask,
&& __copy_from_user((((char *) &set.sig) + 4),
&frame->extramask,
sizeof(frame->extramask))))
goto badframe;
......@@ -292,7 +297,7 @@ asmlinkage long sys32_sigreturn(struct pt_regs *regs)
current->blocked = set;
recalc_sigpending();
spin_unlock_irq(&current->sighand->siglock);
if (ia32_restore_sigcontext(regs, &frame->sc, &eax))
goto badframe;
return eax;
......@@ -300,7 +305,7 @@ asmlinkage long sys32_sigreturn(struct pt_regs *regs)
badframe:
signal_fault(regs, frame, "32bit sigreturn");
return 0;
}
}
asmlinkage long sys32_rt_sigreturn(struct pt_regs *regs)
{
......@@ -321,7 +326,7 @@ asmlinkage long sys32_rt_sigreturn(struct pt_regs *regs)
current->blocked = set;
recalc_sigpending();
spin_unlock_irq(&current->sighand->siglock);
if (ia32_restore_sigcontext(regs, &frame->uc.uc_mcontext, &eax))
goto badframe;
......@@ -332,17 +337,17 @@ asmlinkage long sys32_rt_sigreturn(struct pt_regs *regs)
return eax;
badframe:
signal_fault(regs,frame,"32bit rt sigreturn");
signal_fault(regs, frame, "32bit rt sigreturn");
return 0;
}
}
/*
* Set up a signal frame.
*/
static int
ia32_setup_sigcontext(struct sigcontext_ia32 __user *sc, struct _fpstate_ia32 __user *fpstate,
struct pt_regs *regs, unsigned int mask)
static int ia32_setup_sigcontext(struct sigcontext_ia32 __user *sc,
struct _fpstate_ia32 __user *fpstate,
struct pt_regs *regs, unsigned int mask)
{
int tmp, err = 0;
......@@ -375,7 +380,7 @@ ia32_setup_sigcontext(struct sigcontext_ia32 __user *sc, struct _fpstate_ia32 __
tmp = save_i387_ia32(current, fpstate, regs, 0);
if (tmp < 0)
err = -EFAULT;
else {
else {
clear_used_math();
stts();
err |= __put_user(ptr_to_compat(tmp ? fpstate : NULL),
......@@ -392,8 +397,8 @@ ia32_setup_sigcontext(struct sigcontext_ia32 __user *sc, struct _fpstate_ia32 __
/*
* Determine which stack to use..
*/
static void __user *
get_sigframe(struct k_sigaction *ka, struct pt_regs * regs, size_t frame_size)
static void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs,
size_t frame_size)
{
unsigned long rsp;
......@@ -409,9 +414,8 @@ get_sigframe(struct k_sigaction *ka, struct pt_regs * regs, size_t frame_size)
/* This is the legacy signal stack switching. */
else if ((regs->ss & 0xffff) != __USER_DS &&
!(ka->sa.sa_flags & SA_RESTORER) &&
ka->sa.sa_restorer) {
ka->sa.sa_restorer)
rsp = (unsigned long) ka->sa.sa_restorer;
}
rsp -= frame_size;
/* Align the stack pointer according to the i386 ABI,
......@@ -421,11 +425,25 @@ get_sigframe(struct k_sigaction *ka, struct pt_regs * regs, size_t frame_size)
}
int ia32_setup_frame(int sig, struct k_sigaction *ka,
compat_sigset_t *set, struct pt_regs * regs)
compat_sigset_t *set, struct pt_regs *regs)
{
struct sigframe __user *frame;
void __user *restorer;
int err = 0;
/* copy_to_user optimizes that into a single 8 byte store */
static const struct {
u16 poplmovl;
u32 val;
u16 int80;
u16 pad;
} __attribute__((packed)) code = {
0xb858, /* popl %eax ; movl $...,%eax */
__NR_ia32_sigreturn,
0x80cd, /* int $0x80 */
0,
};
frame = get_sigframe(ka, regs, sizeof(*frame));
if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
......@@ -443,38 +461,24 @@ int ia32_setup_frame(int sig, struct k_sigaction *ka,
if (_COMPAT_NSIG_WORDS > 1) {
err |= __copy_to_user(frame->extramask, &set->sig[1],
sizeof(frame->extramask));
if (err)
goto give_sigsegv;
}
if (err)
goto give_sigsegv;
/* Return stub is in 32bit vsyscall page */
{
void __user *restorer;
if (current->binfmt->hasvdso)
restorer = VSYSCALL32_SIGRETURN;
else
restorer = (void *)&frame->retcode;
if (ka->sa.sa_flags & SA_RESTORER)
restorer = ka->sa.sa_restorer;
err |= __put_user(ptr_to_compat(restorer), &frame->pretcode);
}
/* These are actually not used anymore, but left because some
gdb versions depend on them as a marker. */
{
/* copy_to_user optimizes that into a single 8 byte store */
static const struct {
u16 poplmovl;
u32 val;
u16 int80;
u16 pad;
} __attribute__((packed)) code = {
0xb858, /* popl %eax ; movl $...,%eax */
__NR_ia32_sigreturn,
0x80cd, /* int $0x80 */
0,
};
err |= __copy_to_user(frame->retcode, &code, 8);
}
if (current->binfmt->hasvdso)
restorer = VSYSCALL32_SIGRETURN;
else
restorer = (void *)&frame->retcode;
if (ka->sa.sa_flags & SA_RESTORER)
restorer = ka->sa.sa_restorer;
err |= __put_user(ptr_to_compat(restorer), &frame->pretcode);
/*
* These are actually not used anymore, but left because some
* gdb versions depend on them as a marker.
*/
err |= __copy_to_user(frame->retcode, &code, 8);
if (err)
goto give_sigsegv;
......@@ -487,11 +491,11 @@ int ia32_setup_frame(int sig, struct k_sigaction *ka,
regs->rdx = 0;
regs->rcx = 0;
asm volatile("movl %0,%%ds" :: "r" (__USER32_DS));
asm volatile("movl %0,%%es" :: "r" (__USER32_DS));
asm volatile("movl %0,%%ds" :: "r" (__USER32_DS));
asm volatile("movl %0,%%es" :: "r" (__USER32_DS));
regs->cs = __USER32_CS;
regs->ss = __USER32_DS;
regs->cs = __USER32_CS;
regs->ss = __USER32_DS;
set_fs(USER_DS);
regs->eflags &= ~TF_MASK;
......@@ -499,8 +503,8 @@ int ia32_setup_frame(int sig, struct k_sigaction *ka,
ptrace_notify(SIGTRAP);
#if DEBUG_SIG
printk("SIG deliver (%s:%d): sp=%p pc=%lx ra=%u\n",
current->comm, current->pid, frame, regs->rip, frame->pretcode);
printk(KERN_DEBUG "SIG deliver (%s:%d): sp=%p pc=%lx ra=%u\n",
current->comm, current->pid, frame, regs->rip, frame->pretcode);
#endif
return 0;
......@@ -511,25 +515,34 @@ int ia32_setup_frame(int sig, struct k_sigaction *ka,
}
int ia32_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
compat_sigset_t *set, struct pt_regs * regs)
compat_sigset_t *set, struct pt_regs *regs)
{
struct rt_sigframe __user *frame;
struct exec_domain *ed = current_thread_info()->exec_domain;
void __user *restorer = VSYSCALL32_RTSIGRETURN;
int err = 0;
/* __copy_to_user optimizes that into a single 8 byte store */
static const struct {
u8 movl;
u32 val;
u16 int80;
u16 pad;
u8 pad2;
} __attribute__((packed)) code = {
0xb8,
__NR_ia32_rt_sigreturn,
0x80cd,
0,
};
frame = get_sigframe(ka, regs, sizeof(*frame));
if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
goto give_sigsegv;
{
struct exec_domain *ed = current_thread_info()->exec_domain;
err |= __put_user((ed
&& ed->signal_invmap
&& sig < 32
? ed->signal_invmap[sig]
: sig),
&frame->sig);
}
err |= __put_user((ed && ed->signal_invmap && sig < 32
? ed->signal_invmap[sig] : sig), &frame->sig);
err |= __put_user(ptr_to_compat(&frame->info), &frame->pinfo);
err |= __put_user(ptr_to_compat(&frame->uc), &frame->puc);
err |= copy_siginfo_to_user32(&frame->info, info);
......@@ -544,38 +557,20 @@ int ia32_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
&frame->uc.uc_stack.ss_flags);
err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
err |= ia32_setup_sigcontext(&frame->uc.uc_mcontext, &frame->fpstate,
regs, set->sig[0]);
regs, set->sig[0]);
err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
if (err)
goto give_sigsegv;
{
void __user *restorer = VSYSCALL32_RTSIGRETURN;
if (ka->sa.sa_flags & SA_RESTORER)
restorer = ka->sa.sa_restorer;
err |= __put_user(ptr_to_compat(restorer), &frame->pretcode);
}
if (ka->sa.sa_flags & SA_RESTORER)
restorer = ka->sa.sa_restorer;
err |= __put_user(ptr_to_compat(restorer), &frame->pretcode);
/* This is movl $,%eax ; int $0x80 */
/* Not actually used anymore, but left because some gdb versions
need it. */
{
/* __copy_to_user optimizes that into a single 8 byte store */
static const struct {
u8 movl;
u32 val;
u16 int80;
u16 pad;
u8 pad2;
} __attribute__((packed)) code = {
0xb8,
__NR_ia32_rt_sigreturn,
0x80cd,
0,
};
err |= __copy_to_user(frame->retcode, &code, 8);
}
/*
* Not actually used anymore, but left because some gdb
* versions need it.
*/
err |= __copy_to_user(frame->retcode, &code, 8);
if (err)
goto give_sigsegv;
......@@ -593,11 +588,11 @@ int ia32_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
regs->rdx = (unsigned long) &frame->info;
regs->rcx = (unsigned long) &frame->uc;
asm volatile("movl %0,%%ds" :: "r" (__USER32_DS));
asm volatile("movl %0,%%es" :: "r" (__USER32_DS));
regs->cs = __USER32_CS;
regs->ss = __USER32_DS;
asm volatile("movl %0,%%ds" :: "r" (__USER32_DS));
asm volatile("movl %0,%%es" :: "r" (__USER32_DS));
regs->cs = __USER32_CS;
regs->ss = __USER32_DS;
set_fs(USER_DS);
regs->eflags &= ~TF_MASK;
......@@ -605,8 +600,8 @@ int ia32_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
ptrace_notify(SIGTRAP);
#if DEBUG_SIG
printk("SIG deliver (%s:%d): sp=%p pc=%lx ra=%u\n",
current->comm, current->pid, frame, regs->rip, frame->pretcode);
printk(KERN_DEBUG "SIG deliver (%s:%d): sp=%p pc=%lx ra=%u\n",
current->comm, current->pid, frame, regs->rip, frame->pretcode);
#endif
return 0;
......
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