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review.evervolv.com / android_kernel_htc_msm8960 / ea2562d94fade3d6ee9b22ed5addbbdba697d22a / . / arch / sparc64 / kernel / signal32.c
blob: 8c1c121330fba5b57687e5e3deca87c9d39ed1d7 [file] [log] [blame]
/* $Id: signal32.c,v 1.74 2002/02/09 19:49:30 davem Exp $
* arch/sparc64/kernel/signal32.c
*
* Copyright (C) 1991, 1992 Linus Torvalds
* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
* Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx)
* Copyright (C) 1997 Eddie C. Dost (ecd@skynet.be)
* Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
*/
#include <linux/sched.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/mm.h>
#include <linux/tty.h>
#include <linux/binfmts.h>
#include <linux/compat.h>
#include <linux/bitops.h>
#include <asm/uaccess.h>
#include <asm/ptrace.h>
#include <asm/svr4.h>
#include <asm/pgtable.h>
#include <asm/psrcompat.h>
#include <asm/fpumacro.h>
#include <asm/visasm.h>
#include <asm/compat_signal.h>
#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
/* Signal frames: the original one (compatible with SunOS):
*
* Set up a signal frame... Make the stack look the way SunOS
* expects it to look which is basically:
*
* ---------------------------------- <-- %sp at signal time
* Struct sigcontext
* Signal address
* Ptr to sigcontext area above
* Signal code
* The signal number itself
* One register window
* ---------------------------------- <-- New %sp
*/
struct signal_sframe32 {
struct reg_window32 sig_window;
int sig_num;
int sig_code;
/* struct sigcontext32 * */ u32 sig_scptr;
int sig_address;
struct sigcontext32 sig_context;
unsigned int extramask[_COMPAT_NSIG_WORDS - 1];
};
/* This magic should be in g_upper[0] for all upper parts
* to be valid.
*/
#define SIGINFO_EXTRA_V8PLUS_MAGIC 0x130e269
typedef struct {
unsigned int g_upper[8];
unsigned int o_upper[8];
unsigned int asi;
} siginfo_extra_v8plus_t;
/*
* And the new one, intended to be used for Linux applications only
* (we have enough in there to work with clone).
* All the interesting bits are in the info field.
*/
struct new_signal_frame32 {
struct sparc_stackf32 ss;
__siginfo32_t info;
/* __siginfo_fpu32_t * */ u32 fpu_save;
unsigned int insns[2];
unsigned int extramask[_COMPAT_NSIG_WORDS - 1];
unsigned int extra_size; /* Should be sizeof(siginfo_extra_v8plus_t) */
/* Only valid if (info.si_regs.psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS */
siginfo_extra_v8plus_t v8plus;
__siginfo_fpu_t fpu_state;
};
typedef struct compat_siginfo{
int si_signo;
int si_errno;
int si_code;
union {
int _pad[SI_PAD_SIZE32];
/* kill() */
struct {
compat_pid_t _pid; /* sender's pid */
unsigned int _uid; /* sender's uid */
} _kill;
/* POSIX.1b timers */
struct {
compat_timer_t _tid; /* timer id */
int _overrun; /* overrun count */
compat_sigval_t _sigval; /* same as below */
int _sys_private; /* not to be passed to user */
} _timer;
/* POSIX.1b signals */
struct {
compat_pid_t _pid; /* sender's pid */
unsigned int _uid; /* sender's uid */
compat_sigval_t _sigval;
} _rt;
/* SIGCHLD */
struct {
compat_pid_t _pid; /* which child */
unsigned int _uid; /* sender's uid */
int _status; /* exit code */
compat_clock_t _utime;
compat_clock_t _stime;
} _sigchld;
/* SIGILL, SIGFPE, SIGSEGV, SIGBUS, SIGEMT */
struct {
u32 _addr; /* faulting insn/memory ref. */
int _trapno;
} _sigfault;
/* SIGPOLL */
struct {
int _band; /* POLL_IN, POLL_OUT, POLL_MSG */
int _fd;
} _sigpoll;
} _sifields;
}compat_siginfo_t;
struct rt_signal_frame32 {
struct sparc_stackf32 ss;
compat_siginfo_t info;
struct pt_regs32 regs;
compat_sigset_t mask;
/* __siginfo_fpu32_t * */ u32 fpu_save;
unsigned int insns[2];
stack_t32 stack;
unsigned int extra_size; /* Should be sizeof(siginfo_extra_v8plus_t) */
/* Only valid if (regs.psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS */
siginfo_extra_v8plus_t v8plus;
__siginfo_fpu_t fpu_state;
};
/* Align macros */
#define SF_ALIGNEDSZ (((sizeof(struct signal_sframe32) + 7) & (~7)))
#define NF_ALIGNEDSZ (((sizeof(struct new_signal_frame32) + 7) & (~7)))
#define RT_ALIGNEDSZ (((sizeof(struct rt_signal_frame32) + 7) & (~7)))
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)))
return -EFAULT;
/* If you change siginfo_t structure, please be sure
this code is fixed accordingly.
It should never copy any pad contained in the structure
to avoid security leaks, but must copy the generic
3 ints plus the relevant union member.
This routine must convert siginfo from 64bit to 32bit as well
at the same time. */
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);
if (from->si_code < 0)
err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE);
else {
switch (from->si_code >> 16) {
case __SI_TIMER >> 16:
err |= __put_user(from->si_tid, &to->si_tid);
err |= __put_user(from->si_overrun, &to->si_overrun);
err |= __put_user(from->si_int, &to->si_int);
break;
case __SI_CHLD >> 16:
err |= __put_user(from->si_utime, &to->si_utime);
err |= __put_user(from->si_stime, &to->si_stime);
err |= __put_user(from->si_status, &to->si_status);
default:
err |= __put_user(from->si_pid, &to->si_pid);
err |= __put_user(from->si_uid, &to->si_uid);
break;
case __SI_FAULT >> 16:
err |= __put_user(from->si_trapno, &to->si_trapno);
err |= __put_user((unsigned long)from->si_addr, &to->si_addr);
break;
case __SI_POLL >> 16:
err |= __put_user(from->si_band, &to->si_band);
err |= __put_user(from->si_fd, &to->si_fd);
break;
case __SI_RT >> 16: /* This is not generated by the kernel as of now. */
case __SI_MESGQ >> 16:
err |= __put_user(from->si_pid, &to->si_pid);
err |= __put_user(from->si_uid, &to->si_uid);
err |= __put_user(from->si_int, &to->si_int);
break;
}
}
return err;
}
/* CAUTION: This is just a very minimalist implementation for the
* sake of compat_sys_rt_sigqueueinfo()
*/
int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from)
{
if (!access_ok(VERIFY_WRITE, from, sizeof(compat_siginfo_t)))
return -EFAULT;
if (copy_from_user(to, from, 3*sizeof(int)) ||
copy_from_user(to->_sifields._pad, from->_sifields._pad,
SI_PAD_SIZE))
return -EFAULT;
return 0;
}
static int restore_fpu_state32(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
{
unsigned long *fpregs = current_thread_info()->fpregs;
unsigned long fprs;
int err;
err = __get_user(fprs, &fpu->si_fprs);
fprs_write(0);
regs->tstate &= ~TSTATE_PEF;
if (fprs & FPRS_DL)
err |= copy_from_user(fpregs, &fpu->si_float_regs[0], (sizeof(unsigned int) * 32));
if (fprs & FPRS_DU)
err |= copy_from_user(fpregs+16, &fpu->si_float_regs[32], (sizeof(unsigned int) * 32));
err |= __get_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
err |= __get_user(current_thread_info()->gsr[0], &fpu->si_gsr);
current_thread_info()->fpsaved[0] |= fprs;
return err;
}
void do_new_sigreturn32(struct pt_regs *regs)
{
struct new_signal_frame32 __user *sf;
unsigned int psr;
unsigned pc, npc, fpu_save;
sigset_t set;
unsigned seta[_COMPAT_NSIG_WORDS];
int err, i;
regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
sf = (struct new_signal_frame32 __user *) regs->u_regs[UREG_FP];
/* 1. Make sure we are not getting garbage from the user */
if (!access_ok(VERIFY_READ, sf, sizeof(*sf)) ||
(((unsigned long) sf) & 3))
goto segv;
get_user(pc, &sf->info.si_regs.pc);
__get_user(npc, &sf->info.si_regs.npc);
if ((pc | npc) & 3)
goto segv;
if (test_thread_flag(TIF_32BIT)) {
pc &= 0xffffffff;
npc &= 0xffffffff;
}
regs->tpc = pc;
regs->tnpc = npc;
/* 2. Restore the state */
err = __get_user(regs->y, &sf->info.si_regs.y);
err |= __get_user(psr, &sf->info.si_regs.psr);
for (i = UREG_G1; i <= UREG_I7; i++)
err |= __get_user(regs->u_regs[i], &sf->info.si_regs.u_regs[i]);
if ((psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS) {
err |= __get_user(i, &sf->v8plus.g_upper[0]);
if (i == SIGINFO_EXTRA_V8PLUS_MAGIC) {
unsigned long asi;
for (i = UREG_G1; i <= UREG_I7; i++)
err |= __get_user(((u32 *)regs->u_regs)[2*i], &sf->v8plus.g_upper[i]);
err |= __get_user(asi, &sf->v8plus.asi);
regs->tstate &= ~TSTATE_ASI;
regs->tstate |= ((asi & 0xffUL) << 24UL);
}
}
/* User can only change condition codes in %tstate. */
regs->tstate &= ~(TSTATE_ICC|TSTATE_XCC);
regs->tstate |= psr_to_tstate_icc(psr);
err |= __get_user(fpu_save, &sf->fpu_save);
if (fpu_save)
err |= restore_fpu_state32(regs, &sf->fpu_state);
err |= __get_user(seta[0], &sf->info.si_mask);
err |= copy_from_user(seta+1, &sf->extramask,
(_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int));
if (err)
goto segv;
switch (_NSIG_WORDS) {
case 4: set.sig[3] = seta[6] + (((long)seta[7]) << 32);
case 3: set.sig[2] = seta[4] + (((long)seta[5]) << 32);
case 2: set.sig[1] = seta[2] + (((long)seta[3]) << 32);
case 1: set.sig[0] = seta[0] + (((long)seta[1]) << 32);
}
sigdelsetmask(&set, ~_BLOCKABLE);
spin_lock_irq(&current->sighand->siglock);
current->blocked = set;
recalc_sigpending();
spin_unlock_irq(&current->sighand->siglock);
return;
segv:
force_sig(SIGSEGV, current);
}
asmlinkage void do_sigreturn32(struct pt_regs *regs)
{
struct sigcontext32 __user *scptr;
unsigned int pc, npc, psr;
sigset_t set;
unsigned int seta[_COMPAT_NSIG_WORDS];
int err;
/* Always make any pending restarted system calls return -EINTR */
current_thread_info()->restart_block.fn = do_no_restart_syscall;
synchronize_user_stack();
if (test_thread_flag(TIF_NEWSIGNALS)) {
do_new_sigreturn32(regs);
return;
}
scptr = (struct sigcontext32 __user *)
(regs->u_regs[UREG_I0] & 0x00000000ffffffffUL);
/* Check sanity of the user arg. */
if (!access_ok(VERIFY_READ, scptr, sizeof(struct sigcontext32)) ||
(((unsigned long) scptr) & 3))
goto segv;
err = __get_user(pc, &scptr->sigc_pc);
err |= __get_user(npc, &scptr->sigc_npc);
if ((pc | npc) & 3)
goto segv; /* Nice try. */
err |= __get_user(seta[0], &scptr->sigc_mask);
/* Note that scptr + 1 points to extramask */
err |= copy_from_user(seta+1, scptr + 1,
(_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int));
if (err)
goto segv;
switch (_NSIG_WORDS) {
case 4: set.sig[3] = seta[6] + (((long)seta[7]) << 32);
case 3: set.sig[2] = seta[4] + (((long)seta[5]) << 32);
case 2: set.sig[1] = seta[2] + (((long)seta[3]) << 32);
case 1: set.sig[0] = seta[0] + (((long)seta[1]) << 32);
}
sigdelsetmask(&set, ~_BLOCKABLE);
spin_lock_irq(&current->sighand->siglock);
current->blocked = set;
recalc_sigpending();
spin_unlock_irq(&current->sighand->siglock);
if (test_thread_flag(TIF_32BIT)) {
pc &= 0xffffffff;
npc &= 0xffffffff;
}
regs->tpc = pc;
regs->tnpc = npc;
err = __get_user(regs->u_regs[UREG_FP], &scptr->sigc_sp);
err |= __get_user(regs->u_regs[UREG_I0], &scptr->sigc_o0);
err |= __get_user(regs->u_regs[UREG_G1], &scptr->sigc_g1);
/* User can only change condition codes in %tstate. */
err |= __get_user(psr, &scptr->sigc_psr);
if (err)
goto segv;
regs->tstate &= ~(TSTATE_ICC|TSTATE_XCC);
regs->tstate |= psr_to_tstate_icc(psr);
return;
segv:
force_sig(SIGSEGV, current);
}
asmlinkage void do_rt_sigreturn32(struct pt_regs *regs)
{
struct rt_signal_frame32 __user *sf;
unsigned int psr, pc, npc, fpu_save, u_ss_sp;
mm_segment_t old_fs;
sigset_t set;
compat_sigset_t seta;
stack_t st;
int err, i;
/* Always make any pending restarted system calls return -EINTR */
current_thread_info()->restart_block.fn = do_no_restart_syscall;
synchronize_user_stack();
regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
sf = (struct rt_signal_frame32 __user *) regs->u_regs[UREG_FP];
/* 1. Make sure we are not getting garbage from the user */
if (!access_ok(VERIFY_READ, sf, sizeof(*sf)) ||
(((unsigned long) sf) & 3))
goto segv;
get_user(pc, &sf->regs.pc);
__get_user(npc, &sf->regs.npc);
if ((pc | npc) & 3)
goto segv;
if (test_thread_flag(TIF_32BIT)) {
pc &= 0xffffffff;
npc &= 0xffffffff;
}
regs->tpc = pc;
regs->tnpc = npc;
/* 2. Restore the state */
err = __get_user(regs->y, &sf->regs.y);
err |= __get_user(psr, &sf->regs.psr);
for (i = UREG_G1; i <= UREG_I7; i++)
err |= __get_user(regs->u_regs[i], &sf->regs.u_regs[i]);
if ((psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS) {
err |= __get_user(i, &sf->v8plus.g_upper[0]);
if (i == SIGINFO_EXTRA_V8PLUS_MAGIC) {
unsigned long asi;
for (i = UREG_G1; i <= UREG_I7; i++)
err |= __get_user(((u32 *)regs->u_regs)[2*i], &sf->v8plus.g_upper[i]);
err |= __get_user(asi, &sf->v8plus.asi);
regs->tstate &= ~TSTATE_ASI;
regs->tstate |= ((asi & 0xffUL) << 24UL);
}
}
/* User can only change condition codes in %tstate. */
regs->tstate &= ~(TSTATE_ICC|TSTATE_XCC);
regs->tstate |= psr_to_tstate_icc(psr);
err |= __get_user(fpu_save, &sf->fpu_save);
if (fpu_save)
err |= restore_fpu_state32(regs, &sf->fpu_state);
err |= copy_from_user(&seta, &sf->mask, sizeof(compat_sigset_t));
err |= __get_user(u_ss_sp, &sf->stack.ss_sp);
st.ss_sp = compat_ptr(u_ss_sp);
err |= __get_user(st.ss_flags, &sf->stack.ss_flags);
err |= __get_user(st.ss_size, &sf->stack.ss_size);
if (err)
goto segv;
/* It is more difficult to avoid calling this function than to
call it and ignore errors. */
old_fs = get_fs();
set_fs(KERNEL_DS);
do_sigaltstack((stack_t __user *) &st, NULL, (unsigned long)sf);
set_fs(old_fs);
switch (_NSIG_WORDS) {
case 4: set.sig[3] = seta.sig[6] + (((long)seta.sig[7]) << 32);
case 3: set.sig[2] = seta.sig[4] + (((long)seta.sig[5]) << 32);
case 2: set.sig[1] = seta.sig[2] + (((long)seta.sig[3]) << 32);
case 1: set.sig[0] = seta.sig[0] + (((long)seta.sig[1]) << 32);
}
sigdelsetmask(&set, ~_BLOCKABLE);
spin_lock_irq(&current->sighand->siglock);
current->blocked = set;
recalc_sigpending();
spin_unlock_irq(&current->sighand->siglock);
return;
segv:
force_sig(SIGSEGV, current);
}
/* Checks if the fp is valid */
static int invalid_frame_pointer(void __user *fp, int fplen)
{
if ((((unsigned long) fp) & 7) || ((unsigned long)fp) > 0x100000000ULL - fplen)
return 1;
return 0;
}
static void __user *get_sigframe(struct sigaction *sa, struct pt_regs *regs, unsigned long framesize)
{
unsigned long sp;
regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
sp = regs->u_regs[UREG_FP];
/* This is the X/Open sanctioned signal stack switching. */
if (sa->sa_flags & SA_ONSTACK) {
if (!on_sig_stack(sp) && !((current->sas_ss_sp + current->sas_ss_size) & 7))
sp = current->sas_ss_sp + current->sas_ss_size;
}
return (void __user *)(sp - framesize);
}
static void
setup_frame32(struct sigaction *sa, struct pt_regs *regs, int signr, sigset_t *oldset, siginfo_t *info)
{
struct signal_sframe32 __user *sframep;
struct sigcontext32 __user *sc;
unsigned int seta[_COMPAT_NSIG_WORDS];
int err = 0;
void __user *sig_address;
int sig_code;
unsigned long pc = regs->tpc;
unsigned long npc = regs->tnpc;
unsigned int psr;
if (test_thread_flag(TIF_32BIT)) {
pc &= 0xffffffff;
npc &= 0xffffffff;
}
synchronize_user_stack();
save_and_clear_fpu();
sframep = (struct signal_sframe32 __user *)
get_sigframe(sa, regs, SF_ALIGNEDSZ);
if (invalid_frame_pointer(sframep, sizeof(*sframep))){
/* Don't change signal code and address, so that
* post mortem debuggers can have a look.
*/
do_exit(SIGILL);
}
sc = &sframep->sig_context;
/* We've already made sure frame pointer isn't in kernel space... */
err = __put_user((sas_ss_flags(regs->u_regs[UREG_FP]) == SS_ONSTACK),
&sc->sigc_onstack);
switch (_NSIG_WORDS) {
case 4: seta[7] = (oldset->sig[3] >> 32);
seta[6] = oldset->sig[3];
case 3: seta[5] = (oldset->sig[2] >> 32);
seta[4] = oldset->sig[2];
case 2: seta[3] = (oldset->sig[1] >> 32);
seta[2] = oldset->sig[1];
case 1: seta[1] = (oldset->sig[0] >> 32);
seta[0] = oldset->sig[0];
}
err |= __put_user(seta[0], &sc->sigc_mask);
err |= __copy_to_user(sframep->extramask, seta + 1,
(_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int));
err |= __put_user(regs->u_regs[UREG_FP], &sc->sigc_sp);
err |= __put_user(pc, &sc->sigc_pc);
err |= __put_user(npc, &sc->sigc_npc);
psr = tstate_to_psr(regs->tstate);
if (current_thread_info()->fpsaved[0] & FPRS_FEF)
psr |= PSR_EF;
err |= __put_user(psr, &sc->sigc_psr);
err |= __put_user(regs->u_regs[UREG_G1], &sc->sigc_g1);
err |= __put_user(regs->u_regs[UREG_I0], &sc->sigc_o0);
err |= __put_user(get_thread_wsaved(), &sc->sigc_oswins);
err |= copy_in_user((u32 __user *)sframep,
(u32 __user *)(regs->u_regs[UREG_FP]),
sizeof(struct reg_window32));
set_thread_wsaved(0); /* So process is allowed to execute. */
err |= __put_user(signr, &sframep->sig_num);
sig_address = NULL;
sig_code = 0;
if (SI_FROMKERNEL (info) && (info->si_code & __SI_MASK) == __SI_FAULT) {
sig_address = info->si_addr;
switch (signr) {
case SIGSEGV:
switch (info->si_code) {
case SEGV_MAPERR: sig_code = SUBSIG_NOMAPPING; break;
default: sig_code = SUBSIG_PROTECTION; break;
}
break;
case SIGILL:
switch (info->si_code) {
case ILL_ILLOPC: sig_code = SUBSIG_ILLINST; break;
case ILL_PRVOPC: sig_code = SUBSIG_PRIVINST; break;
case ILL_ILLTRP: sig_code = SUBSIG_BADTRAP(info->si_trapno); break;
default: sig_code = SUBSIG_STACK; break;
}
break;
case SIGFPE:
switch (info->si_code) {
case FPE_INTDIV: sig_code = SUBSIG_IDIVZERO; break;
case FPE_INTOVF: sig_code = SUBSIG_FPINTOVFL; break;
case FPE_FLTDIV: sig_code = SUBSIG_FPDIVZERO; break;
case FPE_FLTOVF: sig_code = SUBSIG_FPOVFLOW; break;
case FPE_FLTUND: sig_code = SUBSIG_FPUNFLOW; break;
case FPE_FLTRES: sig_code = SUBSIG_FPINEXACT; break;
case FPE_FLTINV: sig_code = SUBSIG_FPOPERROR; break;
default: sig_code = SUBSIG_FPERROR; break;
}
break;
case SIGBUS:
switch (info->si_code) {
case BUS_ADRALN: sig_code = SUBSIG_ALIGNMENT; break;
case BUS_ADRERR: sig_code = SUBSIG_MISCERROR; break;
default: sig_code = SUBSIG_BUSTIMEOUT; break;
}
break;
case SIGEMT:
switch (info->si_code) {
case EMT_TAGOVF: sig_code = SUBSIG_TAG; break;
}
break;
case SIGSYS:
if (info->si_code == (__SI_FAULT|0x100)) {
/* See sys_sunos32.c */
sig_code = info->si_trapno;
break;
}
default:
sig_address = NULL;
}
}
err |= __put_user(ptr_to_compat(sig_address), &sframep->sig_address);
err |= __put_user(sig_code, &sframep->sig_code);
err |= __put_user(ptr_to_compat(sc), &sframep->sig_scptr);
if (err)
goto sigsegv;
regs->u_regs[UREG_FP] = (unsigned long) sframep;
regs->tpc = (unsigned long) sa->sa_handler;
regs->tnpc = (regs->tpc + 4);
if (test_thread_flag(TIF_32BIT)) {
regs->tpc &= 0xffffffff;
regs->tnpc &= 0xffffffff;
}
return;
sigsegv:
force_sigsegv(signr, current);
}
static int save_fpu_state32(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
{
unsigned long *fpregs = current_thread_info()->fpregs;
unsigned long fprs;
int err = 0;
fprs = current_thread_info()->fpsaved[0];
if (fprs & FPRS_DL)
err |= copy_to_user(&fpu->si_float_regs[0], fpregs,
(sizeof(unsigned int) * 32));
if (fprs & FPRS_DU)
err |= copy_to_user(&fpu->si_float_regs[32], fpregs+16,
(sizeof(unsigned int) * 32));
err |= __put_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
err |= __put_user(current_thread_info()->gsr[0], &fpu->si_gsr);
err |= __put_user(fprs, &fpu->si_fprs);
return err;
}
static void new_setup_frame32(struct k_sigaction *ka, struct pt_regs *regs,
int signo, sigset_t *oldset)
{
struct new_signal_frame32 __user *sf;
int sigframe_size;
u32 psr;
int i, err;
unsigned int seta[_COMPAT_NSIG_WORDS];
/* 1. Make sure everything is clean */
synchronize_user_stack();
save_and_clear_fpu();
sigframe_size = NF_ALIGNEDSZ;
if (!(current_thread_info()->fpsaved[0] & FPRS_FEF))
sigframe_size -= sizeof(__siginfo_fpu_t);
sf = (struct new_signal_frame32 __user *)
get_sigframe(&ka->sa, regs, sigframe_size);
if (invalid_frame_pointer(sf, sigframe_size))
goto sigill;
if (get_thread_wsaved() != 0)
goto sigill;
/* 2. Save the current process state */
if (test_thread_flag(TIF_32BIT)) {
regs->tpc &= 0xffffffff;
regs->tnpc &= 0xffffffff;
}
err = put_user(regs->tpc, &sf->info.si_regs.pc);
err |= __put_user(regs->tnpc, &sf->info.si_regs.npc);
err |= __put_user(regs->y, &sf->info.si_regs.y);
psr = tstate_to_psr(regs->tstate);
if (current_thread_info()->fpsaved[0] & FPRS_FEF)
psr |= PSR_EF;
err |= __put_user(psr, &sf->info.si_regs.psr);
for (i = 0; i < 16; i++)
err |= __put_user(regs->u_regs[i], &sf->info.si_regs.u_regs[i]);
err |= __put_user(sizeof(siginfo_extra_v8plus_t), &sf->extra_size);
err |= __put_user(SIGINFO_EXTRA_V8PLUS_MAGIC, &sf->v8plus.g_upper[0]);
for (i = 1; i < 16; i++)
err |= __put_user(((u32 *)regs->u_regs)[2*i],
&sf->v8plus.g_upper[i]);
err |= __put_user((regs->tstate & TSTATE_ASI) >> 24UL,
&sf->v8plus.asi);
if (psr & PSR_EF) {
err |= save_fpu_state32(regs, &sf->fpu_state);
err |= __put_user((u64)&sf->fpu_state, &sf->fpu_save);
} else {
err |= __put_user(0, &sf->fpu_save);
}
switch (_NSIG_WORDS) {
case 4: seta[7] = (oldset->sig[3] >> 32);
seta[6] = oldset->sig[3];
case 3: seta[5] = (oldset->sig[2] >> 32);
seta[4] = oldset->sig[2];
case 2: seta[3] = (oldset->sig[1] >> 32);
seta[2] = oldset->sig[1];
case 1: seta[1] = (oldset->sig[0] >> 32);
seta[0] = oldset->sig[0];
}
err |= __put_user(seta[0], &sf->info.si_mask);
err |= __copy_to_user(sf->extramask, seta + 1,
(_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int));
err |= copy_in_user((u32 __user *)sf,
(u32 __user *)(regs->u_regs[UREG_FP]),
sizeof(struct reg_window32));
if (err)
goto sigsegv;
/* 3. signal handler back-trampoline and parameters */
regs->u_regs[UREG_FP] = (unsigned long) sf;
regs->u_regs[UREG_I0] = signo;
regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
regs->u_regs[UREG_I2] = (unsigned long) &sf->info;
/* 4. signal handler */
regs->tpc = (unsigned long) ka->sa.sa_handler;
regs->tnpc = (regs->tpc + 4);
if (test_thread_flag(TIF_32BIT)) {
regs->tpc &= 0xffffffff;
regs->tnpc &= 0xffffffff;
}
/* 5. return to kernel instructions */
if (ka->ka_restorer) {
regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
} else {
/* Flush instruction space. */
unsigned long address = ((unsigned long)&(sf->insns[0]));
pgd_t *pgdp = pgd_offset(current->mm, address);
pud_t *pudp = pud_offset(pgdp, address);
pmd_t *pmdp = pmd_offset(pudp, address);
pte_t *ptep;
pte_t pte;
regs->u_regs[UREG_I7] = (unsigned long) (&(sf->insns[0]) - 2);
err = __put_user(0x821020d8, &sf->insns[0]); /*mov __NR_sigreturn, %g1*/
err |= __put_user(0x91d02010, &sf->insns[1]); /*t 0x10*/
if (err)
goto sigsegv;
preempt_disable();
ptep = pte_offset_map(pmdp, address);
pte = *ptep;
if (pte_present(pte)) {
unsigned long page = (unsigned long)
page_address(pte_page(pte));
wmb();
__asm__ __volatile__("flush %0 + %1"
: /* no outputs */
: "r" (page),
"r" (address & (PAGE_SIZE - 1))
: "memory");
}
pte_unmap(ptep);
preempt_enable();
}
return;
sigill:
do_exit(SIGILL);
sigsegv:
force_sigsegv(signo, current);
}
/* Setup a Solaris stack frame */
static void
setup_svr4_frame32(struct sigaction *sa, unsigned long pc, unsigned long npc,
struct pt_regs *regs, int signr, sigset_t *oldset)
{
svr4_signal_frame_t __user *sfp;
svr4_gregset_t __user *gr;
svr4_siginfo_t __user *si;
svr4_mcontext_t __user *mc;
svr4_gwindows_t __user *gw;
svr4_ucontext_t __user *uc;
svr4_sigset_t setv;
unsigned int psr;
int i, err;
synchronize_user_stack();
save_and_clear_fpu();
regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
sfp = (svr4_signal_frame_t __user *)
get_sigframe(sa, regs,
sizeof(struct reg_window32) + SVR4_SF_ALIGNED);
if (invalid_frame_pointer(sfp, sizeof(*sfp)))
do_exit(SIGILL);
/* Start with a clean frame pointer and fill it */
err = clear_user(sfp, sizeof(*sfp));
/* Setup convenience variables */
si = &sfp->si;
uc = &sfp->uc;
gw = &sfp->gw;
mc = &uc->mcontext;
gr = &mc->greg;
/* FIXME: where am I supposed to put this?
* sc->sigc_onstack = old_status;
* anyways, it does not look like it is used for anything at all.
*/
setv.sigbits[0] = oldset->sig[0];
setv.sigbits[1] = (oldset->sig[0] >> 32);
if (_NSIG_WORDS >= 2) {
setv.sigbits[2] = oldset->sig[1];
setv.sigbits[3] = (oldset->sig[1] >> 32);
err |= __copy_to_user(&uc->sigmask, &setv, sizeof(svr4_sigset_t));
} else
err |= __copy_to_user(&uc->sigmask, &setv,
2 * sizeof(unsigned int));
/* Store registers */
if (test_thread_flag(TIF_32BIT)) {
regs->tpc &= 0xffffffff;
regs->tnpc &= 0xffffffff;
}
err |= __put_user(regs->tpc, &((*gr)[SVR4_PC]));
err |= __put_user(regs->tnpc, &((*gr)[SVR4_NPC]));
psr = tstate_to_psr(regs->tstate);
if (current_thread_info()->fpsaved[0] & FPRS_FEF)
psr |= PSR_EF;
err |= __put_user(psr, &((*gr)[SVR4_PSR]));
err |= __put_user(regs->y, &((*gr)[SVR4_Y]));
/* Copy g[1..7] and o[0..7] registers */
for (i = 0; i < 7; i++)
err |= __put_user(regs->u_regs[UREG_G1+i], (&(*gr)[SVR4_G1])+i);
for (i = 0; i < 8; i++)
err |= __put_user(regs->u_regs[UREG_I0+i], (&(*gr)[SVR4_O0])+i);
/* Setup sigaltstack */
err |= __put_user(current->sas_ss_sp, &uc->stack.sp);
err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &uc->stack.flags);
err |= __put_user(current->sas_ss_size, &uc->stack.size);
/* Save the currently window file: */
/* 1. Link sfp->uc->gwins to our windows */
err |= __put_user(ptr_to_compat(gw), &mc->gwin);
/* 2. Number of windows to restore at setcontext (): */
err |= __put_user(get_thread_wsaved(), &gw->count);
/* 3. We just pay attention to the gw->count field on setcontext */
set_thread_wsaved(0); /* So process is allowed to execute. */
/* Setup the signal information. Solaris expects a bunch of
* information to be passed to the signal handler, we don't provide
* that much currently, should use siginfo.
*/
err |= __put_user(signr, &si->siginfo.signo);
err |= __put_user(SVR4_SINOINFO, &si->siginfo.code);
if (err)
goto sigsegv;
regs->u_regs[UREG_FP] = (unsigned long) sfp;
regs->tpc = (unsigned long) sa->sa_handler;
regs->tnpc = (regs->tpc + 4);
if (test_thread_flag(TIF_32BIT)) {
regs->tpc &= 0xffffffff;
regs->tnpc &= 0xffffffff;
}
/* Arguments passed to signal handler */
if (regs->u_regs[14]){
struct reg_window32 __user *rw = (struct reg_window32 __user *)
(regs->u_regs[14] & 0x00000000ffffffffUL);
err |= __put_user(signr, &rw->ins[0]);
err |= __put_user((u64)si, &rw->ins[1]);
err |= __put_user((u64)uc, &rw->ins[2]);
err |= __put_user((u64)sfp, &rw->ins[6]); /* frame pointer */
if (err)
goto sigsegv;
regs->u_regs[UREG_I0] = signr;
regs->u_regs[UREG_I1] = (u32)(u64) si;
regs->u_regs[UREG_I2] = (u32)(u64) uc;
}
return;
sigsegv:
force_sigsegv(signr, current);
}
asmlinkage int
svr4_getcontext(svr4_ucontext_t __user *uc, struct pt_regs *regs)
{
svr4_gregset_t __user *gr;
svr4_mcontext_t __user *mc;
svr4_sigset_t setv;
int i, err;
u32 psr;
synchronize_user_stack();
save_and_clear_fpu();
if (get_thread_wsaved())
do_exit(SIGSEGV);
err = clear_user(uc, sizeof(*uc));
/* Setup convenience variables */
mc = &uc->mcontext;
gr = &mc->greg;
setv.sigbits[0] = current->blocked.sig[0];
setv.sigbits[1] = (current->blocked.sig[0] >> 32);
if (_NSIG_WORDS >= 2) {
setv.sigbits[2] = current->blocked.sig[1];
setv.sigbits[3] = (current->blocked.sig[1] >> 32);
err |= __copy_to_user(&uc->sigmask, &setv, sizeof(svr4_sigset_t));
} else
err |= __copy_to_user(&uc->sigmask, &setv, 2 * sizeof(unsigned));
/* Store registers */
if (test_thread_flag(TIF_32BIT)) {
regs->tpc &= 0xffffffff;
regs->tnpc &= 0xffffffff;
}
err |= __put_user(regs->tpc, &uc->mcontext.greg[SVR4_PC]);
err |= __put_user(regs->tnpc, &uc->mcontext.greg[SVR4_NPC]);
psr = tstate_to_psr(regs->tstate) & ~PSR_EF;
if (current_thread_info()->fpsaved[0] & FPRS_FEF)
psr |= PSR_EF;
err |= __put_user(psr, &uc->mcontext.greg[SVR4_PSR]);
err |= __put_user(regs->y, &uc->mcontext.greg[SVR4_Y]);
/* Copy g[1..7] and o[0..7] registers */
for (i = 0; i < 7; i++)
err |= __put_user(regs->u_regs[UREG_G1+i], (&(*gr)[SVR4_G1])+i);
for (i = 0; i < 8; i++)
err |= __put_user(regs->u_regs[UREG_I0+i], (&(*gr)[SVR4_O0])+i);
/* Setup sigaltstack */
err |= __put_user(current->sas_ss_sp, &uc->stack.sp);
err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &uc->stack.flags);
err |= __put_user(current->sas_ss_size, &uc->stack.size);
/* The register file is not saved
* we have already stuffed all of it with sync_user_stack
*/
return (err ? -EFAULT : 0);
}
/* Set the context for a svr4 application, this is Solaris way to sigreturn */
asmlinkage int svr4_setcontext(svr4_ucontext_t __user *c, struct pt_regs *regs)
{
svr4_gregset_t __user *gr;
mm_segment_t old_fs;
u32 pc, npc, psr, u_ss_sp;
sigset_t set;
svr4_sigset_t setv;
int i, err;
stack_t st;
/* Fixme: restore windows, or is this already taken care of in
* svr4_setup_frame when sync_user_windows is done?
*/
flush_user_windows();
if (get_thread_wsaved())
goto sigsegv;
if (((unsigned long) c) & 3){
printk("Unaligned structure passed\n");
goto sigsegv;
}
if (!__access_ok(c, sizeof(*c))) {
/* Miguel, add nice debugging msg _here_. ;-) */
goto sigsegv;
}
/* Check for valid PC and nPC */
gr = &c->mcontext.greg;
err = __get_user(pc, &((*gr)[SVR4_PC]));
err |= __get_user(npc, &((*gr)[SVR4_NPC]));
if ((pc | npc) & 3)
goto sigsegv;
/* Retrieve information from passed ucontext */
/* note that nPC is ored a 1, this is used to inform entry.S */
/* that we don't want it to mess with our PC and nPC */
err |= copy_from_user(&setv, &c->sigmask, sizeof(svr4_sigset_t));
set.sig[0] = setv.sigbits[0] | (((long)setv.sigbits[1]) << 32);
if (_NSIG_WORDS >= 2)
set.sig[1] = setv.sigbits[2] | (((long)setv.sigbits[3]) << 32);
err |= __get_user(u_ss_sp, &c->stack.sp);
st.ss_sp = compat_ptr(u_ss_sp);
err |= __get_user(st.ss_flags, &c->stack.flags);
err |= __get_user(st.ss_size, &c->stack.size);
if (err)
goto sigsegv;
/* It is more difficult to avoid calling this function than to
call it and ignore errors. */
old_fs = get_fs();
set_fs(KERNEL_DS);
do_sigaltstack((stack_t __user *) &st, NULL, regs->u_regs[UREG_I6]);
set_fs(old_fs);
sigdelsetmask(&set, ~_BLOCKABLE);
spin_lock_irq(&current->sighand->siglock);
current->blocked = set;
recalc_sigpending();
spin_unlock_irq(&current->sighand->siglock);
regs->tpc = pc;
regs->tnpc = npc | 1;
if (test_thread_flag(TIF_32BIT)) {
regs->tpc &= 0xffffffff;
regs->tnpc &= 0xffffffff;
}
err |= __get_user(regs->y, &((*gr)[SVR4_Y]));
err |= __get_user(psr, &((*gr)[SVR4_PSR]));
regs->tstate &= ~(TSTATE_ICC|TSTATE_XCC);
regs->tstate |= psr_to_tstate_icc(psr);
/* Restore g[1..7] and o[0..7] registers */
for (i = 0; i < 7; i++)
err |= __get_user(regs->u_regs[UREG_G1+i], (&(*gr)[SVR4_G1])+i);
for (i = 0; i < 8; i++)
err |= __get_user(regs->u_regs[UREG_I0+i], (&(*gr)[SVR4_O0])+i);
if (err)
goto sigsegv;
return -EINTR;
sigsegv:
return -EFAULT;
}
static void setup_rt_frame32(struct k_sigaction *ka, struct pt_regs *regs,
unsigned long signr, sigset_t *oldset,
siginfo_t *info)
{
struct rt_signal_frame32 __user *sf;
int sigframe_size;
u32 psr;
int i, err;
compat_sigset_t seta;
/* 1. Make sure everything is clean */
synchronize_user_stack();
save_and_clear_fpu();
sigframe_size = RT_ALIGNEDSZ;
if (!(current_thread_info()->fpsaved[0] & FPRS_FEF))
sigframe_size -= sizeof(__siginfo_fpu_t);
sf = (struct rt_signal_frame32 __user *)
get_sigframe(&ka->sa, regs, sigframe_size);
if (invalid_frame_pointer(sf, sigframe_size))
goto sigill;
if (get_thread_wsaved() != 0)
goto sigill;
/* 2. Save the current process state */
if (test_thread_flag(TIF_32BIT)) {
regs->tpc &= 0xffffffff;
regs->tnpc &= 0xffffffff;
}
err = put_user(regs->tpc, &sf->regs.pc);
err |= __put_user(regs->tnpc, &sf->regs.npc);
err |= __put_user(regs->y, &sf->regs.y);
psr = tstate_to_psr(regs->tstate);
if (current_thread_info()->fpsaved[0] & FPRS_FEF)
psr |= PSR_EF;
err |= __put_user(psr, &sf->regs.psr);
for (i = 0; i < 16; i++)
err |= __put_user(regs->u_regs[i], &sf->regs.u_regs[i]);
err |= __put_user(sizeof(siginfo_extra_v8plus_t), &sf->extra_size);
err |= __put_user(SIGINFO_EXTRA_V8PLUS_MAGIC, &sf->v8plus.g_upper[0]);
for (i = 1; i < 16; i++)
err |= __put_user(((u32 *)regs->u_regs)[2*i],
&sf->v8plus.g_upper[i]);
err |= __put_user((regs->tstate & TSTATE_ASI) >> 24UL,
&sf->v8plus.asi);
if (psr & PSR_EF) {
err |= save_fpu_state32(regs, &sf->fpu_state);
err |= __put_user((u64)&sf->fpu_state, &sf->fpu_save);
} else {
err |= __put_user(0, &sf->fpu_save);
}
/* Update the siginfo structure. */
err |= copy_siginfo_to_user32(&sf->info, info);
/* Setup sigaltstack */
err |= __put_user(current->sas_ss_sp, &sf->stack.ss_sp);
err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &sf->stack.ss_flags);
err |= __put_user(current->sas_ss_size, &sf->stack.ss_size);
switch (_NSIG_WORDS) {
case 4: seta.sig[7] = (oldset->sig[3] >> 32);
seta.sig[6] = oldset->sig[3];
case 3: seta.sig[5] = (oldset->sig[2] >> 32);
seta.sig[4] = oldset->sig[2];
case 2: seta.sig[3] = (oldset->sig[1] >> 32);
seta.sig[2] = oldset->sig[1];
case 1: seta.sig[1] = (oldset->sig[0] >> 32);
seta.sig[0] = oldset->sig[0];
}
err |= __copy_to_user(&sf->mask, &seta, sizeof(compat_sigset_t));
err |= copy_in_user((u32 __user *)sf,
(u32 __user *)(regs->u_regs[UREG_FP]),
sizeof(struct reg_window32));
if (err)
goto sigsegv;
/* 3. signal handler back-trampoline and parameters */
regs->u_regs[UREG_FP] = (unsigned long) sf;
regs->u_regs[UREG_I0] = signr;
regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
regs->u_regs[UREG_I2] = (unsigned long) &sf->regs;
/* 4. signal handler */
regs->tpc = (unsigned long) ka->sa.sa_handler;
regs->tnpc = (regs->tpc + 4);
if (test_thread_flag(TIF_32BIT)) {
regs->tpc &= 0xffffffff;
regs->tnpc &= 0xffffffff;
}
/* 5. return to kernel instructions */
if (ka->ka_restorer)
regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
else {
/* Flush instruction space. */
unsigned long address = ((unsigned long)&(sf->insns[0]));
pgd_t *pgdp = pgd_offset(current->mm, address);
pud_t *pudp = pud_offset(pgdp, address);
pmd_t *pmdp = pmd_offset(pudp, address);
pte_t *ptep;
regs->u_regs[UREG_I7] = (unsigned long) (&(sf->insns[0]) - 2);
/* mov __NR_rt_sigreturn, %g1 */
err |= __put_user(0x82102065, &sf->insns[0]);
/* t 0x10 */
err |= __put_user(0x91d02010, &sf->insns[1]);
if (err)
goto sigsegv;
preempt_disable();
ptep = pte_offset_map(pmdp, address);
if (pte_present(*ptep)) {
unsigned long page = (unsigned long)
page_address(pte_page(*ptep));
wmb();
__asm__ __volatile__("flush %0 + %1"
: /* no outputs */
: "r" (page),
"r" (address & (PAGE_SIZE - 1))
: "memory");
}
pte_unmap(ptep);
preempt_enable();
}
return;
sigill:
do_exit(SIGILL);
sigsegv:
force_sigsegv(signr, current);
}
static inline void handle_signal32(unsigned long signr, struct k_sigaction *ka,
siginfo_t *info,
sigset_t *oldset, struct pt_regs *regs,
int svr4_signal)
{
if (svr4_signal)
setup_svr4_frame32(&ka->sa, regs->tpc, regs->tnpc,
regs, signr, oldset);
else {
if (ka->sa.sa_flags & SA_SIGINFO)
setup_rt_frame32(ka, regs, signr, oldset, info);
else if (test_thread_flag(TIF_NEWSIGNALS))
new_setup_frame32(ka, regs, signr, oldset);
else
setup_frame32(&ka->sa, regs, signr, oldset, info);
}
spin_lock_irq(&current->sighand->siglock);
sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
if (!(ka->sa.sa_flags & SA_NOMASK))
sigaddset(&current->blocked,signr);
recalc_sigpending();
spin_unlock_irq(&current->sighand->siglock);
}
static inline void syscall_restart32(unsigned long orig_i0, struct pt_regs *regs,
struct sigaction *sa)
{
switch (regs->u_regs[UREG_I0]) {
case ERESTART_RESTARTBLOCK:
case ERESTARTNOHAND:
no_system_call_restart:
regs->u_regs[UREG_I0] = EINTR;
regs->tstate |= TSTATE_ICARRY;
break;
case ERESTARTSYS:
if (!(sa->sa_flags & SA_RESTART))
goto no_system_call_restart;
/* fallthrough */
case ERESTARTNOINTR:
regs->u_regs[UREG_I0] = orig_i0;
regs->tpc -= 4;
regs->tnpc -= 4;
}
}
/* 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
* mistake.
*/
void do_signal32(sigset_t *oldset, struct pt_regs * regs,
unsigned long orig_i0, int restart_syscall)
{
siginfo_t info;
struct signal_deliver_cookie cookie;
struct k_sigaction ka;
int signr;
int svr4_signal = current->personality == PER_SVR4;
cookie.restart_syscall = restart_syscall;
cookie.orig_i0 = orig_i0;
signr = get_signal_to_deliver(&info, &ka, regs, &cookie);
if (signr > 0) {
if (cookie.restart_syscall)
syscall_restart32(orig_i0, regs, &ka.sa);
handle_signal32(signr, &ka, &info, oldset,
regs, svr4_signal);
/* a signal was successfully delivered; the saved
* sigmask will have been stored in the signal frame,
* and will be restored by sigreturn, so we can simply
* clear the TIF_RESTORE_SIGMASK flag.
*/
if (test_thread_flag(TIF_RESTORE_SIGMASK))
clear_thread_flag(TIF_RESTORE_SIGMASK);
return;
}
if (cookie.restart_syscall &&
(regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
regs->u_regs[UREG_I0] == ERESTARTSYS ||
regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
/* replay the system call when we are done */
regs->u_regs[UREG_I0] = cookie.orig_i0;
regs->tpc -= 4;
regs->tnpc -= 4;
}
if (cookie.restart_syscall &&
regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
regs->u_regs[UREG_G1] = __NR_restart_syscall;
regs->tpc -= 4;
regs->tnpc -= 4;
}
/* if there's no signal to deliver, we just put the saved sigmask
* back
*/
if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
clear_thread_flag(TIF_RESTORE_SIGMASK);
sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
}
}
struct sigstack32 {
u32 the_stack;
int cur_status;
};
asmlinkage int do_sys32_sigstack(u32 u_ssptr, u32 u_ossptr, unsigned long sp)
{
struct sigstack32 __user *ssptr =
(struct sigstack32 __user *)((unsigned long)(u_ssptr));
struct sigstack32 __user *ossptr =
(struct sigstack32 __user *)((unsigned long)(u_ossptr));
int ret = -EFAULT;
/* First see if old state is wanted. */
if (ossptr) {
if (put_user(current->sas_ss_sp + current->sas_ss_size,
&ossptr->the_stack) ||
__put_user(on_sig_stack(sp), &ossptr->cur_status))
goto out;
}
/* Now see if we want to update the new state. */
if (ssptr) {
u32 ss_sp;
if (get_user(ss_sp, &ssptr->the_stack))
goto out;
/* If the current stack was set with sigaltstack, don't
* swap stacks while we are on it.
*/
ret = -EPERM;
if (current->sas_ss_sp && on_sig_stack(sp))
goto out;
/* Since we don't know the extent of the stack, and we don't
* track onstack-ness, but rather calculate it, we must
* presume a size. Ho hum this interface is lossy.
*/
current->sas_ss_sp = (unsigned long)ss_sp - SIGSTKSZ;
current->sas_ss_size = SIGSTKSZ;
}
ret = 0;
out:
return ret;
}
asmlinkage long do_sys32_sigaltstack(u32 ussa, u32 uossa, unsigned long sp)
{
stack_t uss, uoss;
u32 u_ss_sp = 0;
int ret;
mm_segment_t old_fs;
stack_t32 __user *uss32 = compat_ptr(ussa);
stack_t32 __user *uoss32 = compat_ptr(uossa);
if (ussa && (get_user(u_ss_sp, &uss32->ss_sp) ||
__get_user(uss.ss_flags, &uss32->ss_flags) ||
__get_user(uss.ss_size, &uss32->ss_size)))
return -EFAULT;
uss.ss_sp = compat_ptr(u_ss_sp);
old_fs = get_fs();
set_fs(KERNEL_DS);
ret = do_sigaltstack(ussa ? (stack_t __user *) &uss : NULL,
uossa ? (stack_t __user *) &uoss : NULL, sp);
set_fs(old_fs);
if (!ret && uossa && (put_user(ptr_to_compat(uoss.ss_sp), &uoss32->ss_sp) ||
__put_user(uoss.ss_flags, &uoss32->ss_flags) ||
__put_user(uoss.ss_size, &uoss32->ss_size)))
return -EFAULT;
return ret;
}