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QEMU-Nyx-fork/linux-user/signal.c
j_mayer 84409ddbda Code provision for x86_64 and PowerPC 64 linux user mode support. 
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@2619 c046a42c-6fe2-441c-8c8c-71466251a162
2007-04-06 08:56:50 +00:00

2075 lines
57 KiB
C
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/*
* Emulation of Linux signals
*
* Copyright (c) 2003 Fabrice Bellard
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <stdarg.h>
#include <unistd.h>
#include <signal.h>
#include <errno.h>
#include <sys/ucontext.h>
#include "qemu.h"
//#define DEBUG_SIGNAL
#define MAX_SIGQUEUE_SIZE 1024
struct sigqueue {
struct sigqueue *next;
target_siginfo_t info;
};
struct emulated_sigaction {
struct target_sigaction sa;
int pending; /* true if signal is pending */
struct sigqueue *first;
struct sigqueue info; /* in order to always have memory for the
first signal, we put it here */
};
static struct emulated_sigaction sigact_table[TARGET_NSIG];
static struct sigqueue sigqueue_table[MAX_SIGQUEUE_SIZE]; /* siginfo queue */
static struct sigqueue *first_free; /* first free siginfo queue entry */
static int signal_pending; /* non zero if a signal may be pending */
static void host_signal_handler(int host_signum, siginfo_t *info,
void *puc);
static uint8_t host_to_target_signal_table[65] = {
[SIGHUP] = TARGET_SIGHUP,
[SIGINT] = TARGET_SIGINT,
[SIGQUIT] = TARGET_SIGQUIT,
[SIGILL] = TARGET_SIGILL,
[SIGTRAP] = TARGET_SIGTRAP,
[SIGABRT] = TARGET_SIGABRT,
/* [SIGIOT] = TARGET_SIGIOT,*/
[SIGBUS] = TARGET_SIGBUS,
[SIGFPE] = TARGET_SIGFPE,
[SIGKILL] = TARGET_SIGKILL,
[SIGUSR1] = TARGET_SIGUSR1,
[SIGSEGV] = TARGET_SIGSEGV,
[SIGUSR2] = TARGET_SIGUSR2,
[SIGPIPE] = TARGET_SIGPIPE,
[SIGALRM] = TARGET_SIGALRM,
[SIGTERM] = TARGET_SIGTERM,
#ifdef SIGSTKFLT
[SIGSTKFLT] = TARGET_SIGSTKFLT,
#endif
[SIGCHLD] = TARGET_SIGCHLD,
[SIGCONT] = TARGET_SIGCONT,
[SIGSTOP] = TARGET_SIGSTOP,
[SIGTSTP] = TARGET_SIGTSTP,
[SIGTTIN] = TARGET_SIGTTIN,
[SIGTTOU] = TARGET_SIGTTOU,
[SIGURG] = TARGET_SIGURG,
[SIGXCPU] = TARGET_SIGXCPU,
[SIGXFSZ] = TARGET_SIGXFSZ,
[SIGVTALRM] = TARGET_SIGVTALRM,
[SIGPROF] = TARGET_SIGPROF,
[SIGWINCH] = TARGET_SIGWINCH,
[SIGIO] = TARGET_SIGIO,
[SIGPWR] = TARGET_SIGPWR,
[SIGSYS] = TARGET_SIGSYS,
/* next signals stay the same */
};
static uint8_t target_to_host_signal_table[65];
static inline int host_to_target_signal(int sig)
{
return host_to_target_signal_table[sig];
}
static inline int target_to_host_signal(int sig)
{
return target_to_host_signal_table[sig];
}
static void host_to_target_sigset_internal(target_sigset_t *d,
const sigset_t *s)
{
int i;
unsigned long sigmask;
uint32_t target_sigmask;
sigmask = ((unsigned long *)s)[0];
target_sigmask = 0;
for(i = 0; i < 32; i++) {
if (sigmask & (1 << i))
target_sigmask |= 1 << (host_to_target_signal(i + 1) - 1);
}
#if TARGET_LONG_BITS == 32 && HOST_LONG_BITS == 32
d->sig[0] = target_sigmask;
for(i = 1;i < TARGET_NSIG_WORDS; i++) {
d->sig[i] = ((unsigned long *)s)[i];
}
#elif TARGET_LONG_BITS == 32 && HOST_LONG_BITS == 64 && TARGET_NSIG_WORDS == 2
d->sig[0] = target_sigmask;
d->sig[1] = sigmask >> 32;
#else
#warning host_to_target_sigset
#endif
}
void host_to_target_sigset(target_sigset_t *d, const sigset_t *s)
{
target_sigset_t d1;
int i;
host_to_target_sigset_internal(&d1, s);
for(i = 0;i < TARGET_NSIG_WORDS; i++)
d->sig[i] = tswapl(d1.sig[i]);
}
void target_to_host_sigset_internal(sigset_t *d, const target_sigset_t *s)
{
int i;
unsigned long sigmask;
target_ulong target_sigmask;
target_sigmask = s->sig[0];
sigmask = 0;
for(i = 0; i < 32; i++) {
if (target_sigmask & (1 << i))
sigmask |= 1 << (target_to_host_signal(i + 1) - 1);
}
#if TARGET_LONG_BITS == 32 && HOST_LONG_BITS == 32
((unsigned long *)d)[0] = sigmask;
for(i = 1;i < TARGET_NSIG_WORDS; i++) {
((unsigned long *)d)[i] = s->sig[i];
}
#elif TARGET_LONG_BITS == 32 && HOST_LONG_BITS == 64 && TARGET_NSIG_WORDS == 2
((unsigned long *)d)[0] = sigmask | ((unsigned long)(s->sig[1]) << 32);
#else
#warning target_to_host_sigset
#endif /* TARGET_LONG_BITS */
}
void target_to_host_sigset(sigset_t *d, const target_sigset_t *s)
{
target_sigset_t s1;
int i;
for(i = 0;i < TARGET_NSIG_WORDS; i++)
s1.sig[i] = tswapl(s->sig[i]);
target_to_host_sigset_internal(d, &s1);
}
void host_to_target_old_sigset(target_ulong *old_sigset,
const sigset_t *sigset)
{
target_sigset_t d;
host_to_target_sigset(&d, sigset);
*old_sigset = d.sig[0];
}
void target_to_host_old_sigset(sigset_t *sigset,
const target_ulong *old_sigset)
{
target_sigset_t d;
int i;
d.sig[0] = *old_sigset;
for(i = 1;i < TARGET_NSIG_WORDS; i++)
d.sig[i] = 0;
target_to_host_sigset(sigset, &d);
}
/* siginfo conversion */
static inline void host_to_target_siginfo_noswap(target_siginfo_t *tinfo,
const siginfo_t *info)
{
int sig;
sig = host_to_target_signal(info->si_signo);
tinfo->si_signo = sig;
tinfo->si_errno = 0;
tinfo->si_code = 0;
if (sig == SIGILL || sig == SIGFPE || sig == SIGSEGV ||
sig == SIGBUS || sig == SIGTRAP) {
/* should never come here, but who knows. The information for
the target is irrelevant */
tinfo->_sifields._sigfault._addr = 0;
} else if (sig >= TARGET_SIGRTMIN) {
tinfo->_sifields._rt._pid = info->si_pid;
tinfo->_sifields._rt._uid = info->si_uid;
/* XXX: potential problem if 64 bit */
tinfo->_sifields._rt._sigval.sival_ptr =
(target_ulong)info->si_value.sival_ptr;
}
}
static void tswap_siginfo(target_siginfo_t *tinfo,
const target_siginfo_t *info)
{
int sig;
sig = info->si_signo;
tinfo->si_signo = tswap32(sig);
tinfo->si_errno = tswap32(info->si_errno);
tinfo->si_code = tswap32(info->si_code);
if (sig == SIGILL || sig == SIGFPE || sig == SIGSEGV ||
sig == SIGBUS || sig == SIGTRAP) {
tinfo->_sifields._sigfault._addr =
tswapl(info->_sifields._sigfault._addr);
} else if (sig >= TARGET_SIGRTMIN) {
tinfo->_sifields._rt._pid = tswap32(info->_sifields._rt._pid);
tinfo->_sifields._rt._uid = tswap32(info->_sifields._rt._uid);
tinfo->_sifields._rt._sigval.sival_ptr =
tswapl(info->_sifields._rt._sigval.sival_ptr);
}
}
void host_to_target_siginfo(target_siginfo_t *tinfo, const siginfo_t *info)
{
host_to_target_siginfo_noswap(tinfo, info);
tswap_siginfo(tinfo, tinfo);
}
/* XXX: we support only POSIX RT signals are used. */
/* XXX: find a solution for 64 bit (additionnal malloced data is needed) */
void target_to_host_siginfo(siginfo_t *info, const target_siginfo_t *tinfo)
{
info->si_signo = tswap32(tinfo->si_signo);
info->si_errno = tswap32(tinfo->si_errno);
info->si_code = tswap32(tinfo->si_code);
info->si_pid = tswap32(tinfo->_sifields._rt._pid);
info->si_uid = tswap32(tinfo->_sifields._rt._uid);
info->si_value.sival_ptr =
(void *)tswapl(tinfo->_sifields._rt._sigval.sival_ptr);
}
void signal_init(void)
{
struct sigaction act;
int i, j;
/* generate signal conversion tables */
for(i = 1; i <= 64; i++) {
if (host_to_target_signal_table[i] == 0)
host_to_target_signal_table[i] = i;
}
for(i = 1; i <= 64; i++) {
j = host_to_target_signal_table[i];
target_to_host_signal_table[j] = i;
}
/* set all host signal handlers. ALL signals are blocked during
the handlers to serialize them. */
sigfillset(&act.sa_mask);
act.sa_flags = SA_SIGINFO;
act.sa_sigaction = host_signal_handler;
for(i = 1; i < NSIG; i++) {
sigaction(i, &act, NULL);
}
memset(sigact_table, 0, sizeof(sigact_table));
first_free = &sigqueue_table[0];
for(i = 0; i < MAX_SIGQUEUE_SIZE - 1; i++)
sigqueue_table[i].next = &sigqueue_table[i + 1];
sigqueue_table[MAX_SIGQUEUE_SIZE - 1].next = NULL;
}
/* signal queue handling */
static inline struct sigqueue *alloc_sigqueue(void)
{
struct sigqueue *q = first_free;
if (!q)
return NULL;
first_free = q->next;
return q;
}
static inline void free_sigqueue(struct sigqueue *q)
{
q->next = first_free;
first_free = q;
}
/* abort execution with signal */
void __attribute((noreturn)) force_sig(int sig)
{
int host_sig;
host_sig = target_to_host_signal(sig);
fprintf(stderr, "qemu: uncaught target signal %d (%s) - exiting\n",
sig, strsignal(host_sig));
#if 1
_exit(-host_sig);
#else
{
struct sigaction act;
sigemptyset(&act.sa_mask);
act.sa_flags = SA_SIGINFO;
act.sa_sigaction = SIG_DFL;
sigaction(SIGABRT, &act, NULL);
abort();
}
#endif
}
/* queue a signal so that it will be send to the virtual CPU as soon
as possible */
int queue_signal(int sig, target_siginfo_t *info)
{
struct emulated_sigaction *k;
struct sigqueue *q, **pq;
target_ulong handler;
#if defined(DEBUG_SIGNAL)
fprintf(stderr, "queue_signal: sig=%d\n",
sig);
#endif
k = &sigact_table[sig - 1];
handler = k->sa._sa_handler;
if (handler == TARGET_SIG_DFL) {
/* default handler : ignore some signal. The other are fatal */
if (sig != TARGET_SIGCHLD &&
sig != TARGET_SIGURG &&
sig != TARGET_SIGWINCH) {
force_sig(sig);
} else {
return 0; /* indicate ignored */
}
} else if (handler == TARGET_SIG_IGN) {
/* ignore signal */
return 0;
} else if (handler == TARGET_SIG_ERR) {
force_sig(sig);
} else {
pq = &k->first;
if (sig < TARGET_SIGRTMIN) {
/* if non real time signal, we queue exactly one signal */
if (!k->pending)
q = &k->info;
else
return 0;
} else {
if (!k->pending) {
/* first signal */
q = &k->info;
} else {
q = alloc_sigqueue();
if (!q)
return -EAGAIN;
while (*pq != NULL)
pq = &(*pq)->next;
}
}
*pq = q;
q->info = *info;
q->next = NULL;
k->pending = 1;
/* signal that a new signal is pending */
signal_pending = 1;
return 1; /* indicates that the signal was queued */
}
}
static void host_signal_handler(int host_signum, siginfo_t *info,
void *puc)
{
int sig;
target_siginfo_t tinfo;
/* the CPU emulator uses some host signals to detect exceptions,
we we forward to it some signals */
if (host_signum == SIGSEGV || host_signum == SIGBUS
#if defined(TARGET_I386) && defined(USE_CODE_COPY)
|| host_signum == SIGFPE
#endif
) {
if (cpu_signal_handler(host_signum, info, puc))
return;
}
/* get target signal number */
sig = host_to_target_signal(host_signum);
if (sig < 1 || sig > TARGET_NSIG)
return;
#if defined(DEBUG_SIGNAL)
fprintf(stderr, "qemu: got signal %d\n", sig);
#endif
host_to_target_siginfo_noswap(&tinfo, info);
if (queue_signal(sig, &tinfo) == 1) {
/* interrupt the virtual CPU as soon as possible */
cpu_interrupt(global_env, CPU_INTERRUPT_EXIT);
}
}
int do_sigaction(int sig, const struct target_sigaction *act,
struct target_sigaction *oact)
{
struct emulated_sigaction *k;
struct sigaction act1;
int host_sig;
if (sig < 1 || sig > TARGET_NSIG || sig == SIGKILL || sig == SIGSTOP)
return -EINVAL;
k = &sigact_table[sig - 1];
#if defined(DEBUG_SIGNAL)
fprintf(stderr, "sigaction sig=%d act=0x%08x, oact=0x%08x\n",
sig, (int)act, (int)oact);
#endif
if (oact) {
oact->_sa_handler = tswapl(k->sa._sa_handler);
oact->sa_flags = tswapl(k->sa.sa_flags);
#if !defined(TARGET_MIPS)
oact->sa_restorer = tswapl(k->sa.sa_restorer);
#endif
oact->sa_mask = k->sa.sa_mask;
}
if (act) {
k->sa._sa_handler = tswapl(act->_sa_handler);
k->sa.sa_flags = tswapl(act->sa_flags);
#if !defined(TARGET_MIPS)
k->sa.sa_restorer = tswapl(act->sa_restorer);
#endif
k->sa.sa_mask = act->sa_mask;
/* we update the host linux signal state */
host_sig = target_to_host_signal(sig);
if (host_sig != SIGSEGV && host_sig != SIGBUS) {
sigfillset(&act1.sa_mask);
act1.sa_flags = SA_SIGINFO;
if (k->sa.sa_flags & TARGET_SA_RESTART)
act1.sa_flags |= SA_RESTART;
/* NOTE: it is important to update the host kernel signal
ignore state to avoid getting unexpected interrupted
syscalls */
if (k->sa._sa_handler == TARGET_SIG_IGN) {
act1.sa_sigaction = (void *)SIG_IGN;
} else if (k->sa._sa_handler == TARGET_SIG_DFL) {
act1.sa_sigaction = (void *)SIG_DFL;
} else {
act1.sa_sigaction = host_signal_handler;
}
sigaction(host_sig, &act1, NULL);
}
}
return 0;
}
#ifndef offsetof
#define offsetof(type, field) ((size_t) &((type *)0)->field)
#endif
static inline int copy_siginfo_to_user(target_siginfo_t *tinfo,
const target_siginfo_t *info)
{
tswap_siginfo(tinfo, info);
return 0;
}
#ifdef TARGET_I386
/* from the Linux kernel */
struct target_fpreg {
uint16_t significand[4];
uint16_t exponent;
};
struct target_fpxreg {
uint16_t significand[4];
uint16_t exponent;
uint16_t padding[3];
};
struct target_xmmreg {
target_ulong element[4];
};
struct target_fpstate {
/* Regular FPU environment */
target_ulong cw;
target_ulong sw;
target_ulong tag;
target_ulong ipoff;
target_ulong cssel;
target_ulong dataoff;
target_ulong datasel;
struct target_fpreg _st[8];
uint16_t status;
uint16_t magic; /* 0xffff = regular FPU data only */
/* FXSR FPU environment */
target_ulong _fxsr_env[6]; /* FXSR FPU env is ignored */
target_ulong mxcsr;
target_ulong reserved;
struct target_fpxreg _fxsr_st[8]; /* FXSR FPU reg data is ignored */
struct target_xmmreg _xmm[8];
target_ulong padding[56];
};
#define X86_FXSR_MAGIC 0x0000
struct target_sigcontext {
uint16_t gs, __gsh;
uint16_t fs, __fsh;
uint16_t es, __esh;
uint16_t ds, __dsh;
target_ulong edi;
target_ulong esi;
target_ulong ebp;
target_ulong esp;
target_ulong ebx;
target_ulong edx;
target_ulong ecx;
target_ulong eax;
target_ulong trapno;
target_ulong err;
target_ulong eip;
uint16_t cs, __csh;
target_ulong eflags;
target_ulong esp_at_signal;
uint16_t ss, __ssh;
target_ulong fpstate; /* pointer */
target_ulong oldmask;
target_ulong cr2;
};
typedef struct target_sigaltstack {
target_ulong ss_sp;
int ss_flags;
target_ulong ss_size;
} target_stack_t;
struct target_ucontext {
target_ulong tuc_flags;
target_ulong tuc_link;
target_stack_t tuc_stack;
struct target_sigcontext tuc_mcontext;
target_sigset_t tuc_sigmask; /* mask last for extensibility */
};
struct sigframe
{
target_ulong pretcode;
int sig;
struct target_sigcontext sc;
struct target_fpstate fpstate;
target_ulong extramask[TARGET_NSIG_WORDS-1];
char retcode[8];
};
struct rt_sigframe
{
target_ulong pretcode;
int sig;
target_ulong pinfo;
target_ulong puc;
struct target_siginfo info;
struct target_ucontext uc;
struct target_fpstate fpstate;
char retcode[8];
};
/*
* Set up a signal frame.
*/
/* XXX: save x87 state */
static int
setup_sigcontext(struct target_sigcontext *sc, struct target_fpstate *fpstate,
CPUX86State *env, unsigned long mask)
{
int err = 0;
err |= __put_user(env->segs[R_GS].selector, (unsigned int *)&sc->gs);
err |= __put_user(env->segs[R_FS].selector, (unsigned int *)&sc->fs);
err |= __put_user(env->segs[R_ES].selector, (unsigned int *)&sc->es);
err |= __put_user(env->segs[R_DS].selector, (unsigned int *)&sc->ds);
err |= __put_user(env->regs[R_EDI], &sc->edi);
err |= __put_user(env->regs[R_ESI], &sc->esi);
err |= __put_user(env->regs[R_EBP], &sc->ebp);
err |= __put_user(env->regs[R_ESP], &sc->esp);
err |= __put_user(env->regs[R_EBX], &sc->ebx);
err |= __put_user(env->regs[R_EDX], &sc->edx);
err |= __put_user(env->regs[R_ECX], &sc->ecx);
err |= __put_user(env->regs[R_EAX], &sc->eax);
err |= __put_user(env->exception_index, &sc->trapno);
err |= __put_user(env->error_code, &sc->err);
err |= __put_user(env->eip, &sc->eip);
err |= __put_user(env->segs[R_CS].selector, (unsigned int *)&sc->cs);
err |= __put_user(env->eflags, &sc->eflags);
err |= __put_user(env->regs[R_ESP], &sc->esp_at_signal);
err |= __put_user(env->segs[R_SS].selector, (unsigned int *)&sc->ss);
cpu_x86_fsave(env, (void *)fpstate, 1);
fpstate->status = fpstate->sw;
err |= __put_user(0xffff, &fpstate->magic);
err |= __put_user(fpstate, &sc->fpstate);
/* non-iBCS2 extensions.. */
err |= __put_user(mask, &sc->oldmask);
err |= __put_user(env->cr[2], &sc->cr2);
return err;
}
/*
* Determine which stack to use..
*/
static inline void *
get_sigframe(struct emulated_sigaction *ka, CPUX86State *env, size_t frame_size)
{
unsigned long esp;
/* Default to using normal stack */
esp = env->regs[R_ESP];
#if 0
/* This is the X/Open sanctioned signal stack switching. */
if (ka->sa.sa_flags & SA_ONSTACK) {
if (sas_ss_flags(esp) == 0)
esp = current->sas_ss_sp + current->sas_ss_size;
}
/* This is the legacy signal stack switching. */
else
#endif
if ((env->segs[R_SS].selector & 0xffff) != __USER_DS &&
!(ka->sa.sa_flags & TARGET_SA_RESTORER) &&
ka->sa.sa_restorer) {
esp = (unsigned long) ka->sa.sa_restorer;
}
return g2h((esp - frame_size) & -8ul);
}
static void setup_frame(int sig, struct emulated_sigaction *ka,
target_sigset_t *set, CPUX86State *env)
{
struct sigframe *frame;
int i, err = 0;
frame = get_sigframe(ka, env, sizeof(*frame));
if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
goto give_sigsegv;
err |= __put_user((/*current->exec_domain
&& current->exec_domain->signal_invmap
&& sig < 32
? current->exec_domain->signal_invmap[sig]
: */ sig),
&frame->sig);
if (err)
goto give_sigsegv;
setup_sigcontext(&frame->sc, &frame->fpstate, env, set->sig[0]);
if (err)
goto give_sigsegv;
for(i = 1; i < TARGET_NSIG_WORDS; i++) {
if (__put_user(set->sig[i], &frame->extramask[i - 1]))
goto give_sigsegv;
}
/* Set up to return from userspace. If provided, use a stub
already in userspace. */
if (ka->sa.sa_flags & TARGET_SA_RESTORER) {
err |= __put_user(ka->sa.sa_restorer, &frame->pretcode);
} else {
err |= __put_user(frame->retcode, &frame->pretcode);
/* This is popl %eax ; movl $,%eax ; int $0x80 */
err |= __put_user(0xb858, (short *)(frame->retcode+0));
#if defined(TARGET_X86_64)
#warning "Fix this !"
#else
err |= __put_user(TARGET_NR_sigreturn, (int *)(frame->retcode+2));
#endif
err |= __put_user(0x80cd, (short *)(frame->retcode+6));
}
if (err)
goto give_sigsegv;
/* Set up registers for signal handler */
env->regs[R_ESP] = h2g(frame);
env->eip = (unsigned long) ka->sa._sa_handler;
cpu_x86_load_seg(env, R_DS, __USER_DS);
cpu_x86_load_seg(env, R_ES, __USER_DS);
cpu_x86_load_seg(env, R_SS, __USER_DS);
cpu_x86_load_seg(env, R_CS, __USER_CS);
env->eflags &= ~TF_MASK;
return;
give_sigsegv:
if (sig == TARGET_SIGSEGV)
ka->sa._sa_handler = TARGET_SIG_DFL;
force_sig(TARGET_SIGSEGV /* , current */);
}
static void setup_rt_frame(int sig, struct emulated_sigaction *ka,
target_siginfo_t *info,
target_sigset_t *set, CPUX86State *env)
{
struct rt_sigframe *frame;
int i, err = 0;
frame = get_sigframe(ka, env, sizeof(*frame));
if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
goto give_sigsegv;
err |= __put_user((/*current->exec_domain
&& current->exec_domain->signal_invmap
&& sig < 32
? current->exec_domain->signal_invmap[sig]
: */sig),
&frame->sig);
err |= __put_user((target_ulong)&frame->info, &frame->pinfo);
err |= __put_user((target_ulong)&frame->uc, &frame->puc);
err |= copy_siginfo_to_user(&frame->info, info);
if (err)
goto give_sigsegv;
/* Create the ucontext. */
err |= __put_user(0, &frame->uc.tuc_flags);
err |= __put_user(0, &frame->uc.tuc_link);
err |= __put_user(/*current->sas_ss_sp*/ 0,
&frame->uc.tuc_stack.ss_sp);
err |= __put_user(/* sas_ss_flags(regs->esp) */ 0,
&frame->uc.tuc_stack.ss_flags);
err |= __put_user(/* current->sas_ss_size */ 0,
&frame->uc.tuc_stack.ss_size);
err |= setup_sigcontext(&frame->uc.tuc_mcontext, &frame->fpstate,
env, set->sig[0]);
for(i = 0; i < TARGET_NSIG_WORDS; i++) {
if (__put_user(set->sig[i], &frame->uc.tuc_sigmask.sig[i]))
goto give_sigsegv;
}
/* Set up to return from userspace. If provided, use a stub
already in userspace. */
if (ka->sa.sa_flags & TARGET_SA_RESTORER) {
err |= __put_user(ka->sa.sa_restorer, &frame->pretcode);
} else {
err |= __put_user(frame->retcode, &frame->pretcode);
/* This is movl $,%eax ; int $0x80 */
err |= __put_user(0xb8, (char *)(frame->retcode+0));
err |= __put_user(TARGET_NR_rt_sigreturn, (int *)(frame->retcode+1));
err |= __put_user(0x80cd, (short *)(frame->retcode+5));
}
if (err)
goto give_sigsegv;
/* Set up registers for signal handler */
env->regs[R_ESP] = (unsigned long) frame;
env->eip = (unsigned long) ka->sa._sa_handler;
cpu_x86_load_seg(env, R_DS, __USER_DS);
cpu_x86_load_seg(env, R_ES, __USER_DS);
cpu_x86_load_seg(env, R_SS, __USER_DS);
cpu_x86_load_seg(env, R_CS, __USER_CS);
env->eflags &= ~TF_MASK;
return;
give_sigsegv:
if (sig == TARGET_SIGSEGV)
ka->sa._sa_handler = TARGET_SIG_DFL;
force_sig(TARGET_SIGSEGV /* , current */);
}
static int
restore_sigcontext(CPUX86State *env, struct target_sigcontext *sc, int *peax)
{
unsigned int err = 0;
cpu_x86_load_seg(env, R_GS, lduw(&sc->gs));
cpu_x86_load_seg(env, R_FS, lduw(&sc->fs));
cpu_x86_load_seg(env, R_ES, lduw(&sc->es));
cpu_x86_load_seg(env, R_DS, lduw(&sc->ds));
env->regs[R_EDI] = ldl(&sc->edi);
env->regs[R_ESI] = ldl(&sc->esi);
env->regs[R_EBP] = ldl(&sc->ebp);
env->regs[R_ESP] = ldl(&sc->esp);
env->regs[R_EBX] = ldl(&sc->ebx);
env->regs[R_EDX] = ldl(&sc->edx);
env->regs[R_ECX] = ldl(&sc->ecx);
env->eip = ldl(&sc->eip);
cpu_x86_load_seg(env, R_CS, lduw(&sc->cs) | 3);
cpu_x86_load_seg(env, R_SS, lduw(&sc->ss) | 3);
{
unsigned int tmpflags;
tmpflags = ldl(&sc->eflags);
env->eflags = (env->eflags & ~0x40DD5) | (tmpflags & 0x40DD5);
// regs->orig_eax = -1; /* disable syscall checks */
}
{
struct _fpstate * buf;
buf = (void *)ldl(&sc->fpstate);
if (buf) {
#if 0
if (verify_area(VERIFY_READ, buf, sizeof(*buf)))
goto badframe;
#endif
cpu_x86_frstor(env, (void *)buf, 1);
}
}
*peax = ldl(&sc->eax);
return err;
#if 0
badframe:
return 1;
#endif
}
long do_sigreturn(CPUX86State *env)
{
struct sigframe *frame = (struct sigframe *)g2h(env->regs[R_ESP] - 8);
target_sigset_t target_set;
sigset_t set;
int eax, i;
#if defined(DEBUG_SIGNAL)
fprintf(stderr, "do_sigreturn\n");
#endif
/* set blocked signals */
if (__get_user(target_set.sig[0], &frame->sc.oldmask))
goto badframe;
for(i = 1; i < TARGET_NSIG_WORDS; i++) {
if (__get_user(target_set.sig[i], &frame->extramask[i - 1]))
goto badframe;
}
target_to_host_sigset_internal(&set, &target_set);
sigprocmask(SIG_SETMASK, &set, NULL);
/* restore registers */
if (restore_sigcontext(env, &frame->sc, &eax))
goto badframe;
return eax;
badframe:
force_sig(TARGET_SIGSEGV);
return 0;
}
long do_rt_sigreturn(CPUX86State *env)
{
struct rt_sigframe *frame = (struct rt_sigframe *)g2h(env->regs[R_ESP] - 4);
sigset_t set;
// stack_t st;
int eax;
#if 0
if (verify_area(VERIFY_READ, frame, sizeof(*frame)))
goto badframe;
#endif
target_to_host_sigset(&set, &frame->uc.tuc_sigmask);
sigprocmask(SIG_SETMASK, &set, NULL);
if (restore_sigcontext(env, &frame->uc.tuc_mcontext, &eax))
goto badframe;
#if 0
if (__copy_from_user(&st, &frame->uc.tuc_stack, sizeof(st)))
goto badframe;
/* It is more difficult to avoid calling this function than to
call it and ignore errors. */
do_sigaltstack(&st, NULL, regs->esp);
#endif
return eax;
badframe:
force_sig(TARGET_SIGSEGV);
return 0;
}
#elif defined(TARGET_ARM)
struct target_sigcontext {
target_ulong trap_no;
target_ulong error_code;
target_ulong oldmask;
target_ulong arm_r0;
target_ulong arm_r1;
target_ulong arm_r2;
target_ulong arm_r3;
target_ulong arm_r4;
target_ulong arm_r5;
target_ulong arm_r6;
target_ulong arm_r7;
target_ulong arm_r8;
target_ulong arm_r9;
target_ulong arm_r10;
target_ulong arm_fp;
target_ulong arm_ip;
target_ulong arm_sp;
target_ulong arm_lr;
target_ulong arm_pc;
target_ulong arm_cpsr;
target_ulong fault_address;
};
typedef struct target_sigaltstack {
target_ulong ss_sp;
int ss_flags;
target_ulong ss_size;
} target_stack_t;
struct target_ucontext {
target_ulong tuc_flags;
target_ulong tuc_link;
target_stack_t tuc_stack;
struct target_sigcontext tuc_mcontext;
target_sigset_t tuc_sigmask; /* mask last for extensibility */
};
struct sigframe
{
struct target_sigcontext sc;
target_ulong extramask[TARGET_NSIG_WORDS-1];
target_ulong retcode;
};
struct rt_sigframe
{
struct target_siginfo *pinfo;
void *puc;
struct target_siginfo info;
struct target_ucontext uc;
target_ulong retcode;
};
#define TARGET_CONFIG_CPU_32 1
/*
* For ARM syscalls, we encode the syscall number into the instruction.
*/
#define SWI_SYS_SIGRETURN (0xef000000|(TARGET_NR_sigreturn + ARM_SYSCALL_BASE))
#define SWI_SYS_RT_SIGRETURN (0xef000000|(TARGET_NR_rt_sigreturn + ARM_SYSCALL_BASE))
/*
* For Thumb syscalls, we pass the syscall number via r7. We therefore
* need two 16-bit instructions.
*/
#define SWI_THUMB_SIGRETURN (0xdf00 << 16 | 0x2700 | (TARGET_NR_sigreturn))
#define SWI_THUMB_RT_SIGRETURN (0xdf00 << 16 | 0x2700 | (TARGET_NR_rt_sigreturn))
static const target_ulong retcodes[4] = {
SWI_SYS_SIGRETURN, SWI_THUMB_SIGRETURN,
SWI_SYS_RT_SIGRETURN, SWI_THUMB_RT_SIGRETURN
};
#define __put_user_error(x,p,e) __put_user(x, p)
#define __get_user_error(x,p,e) __get_user(x, p)
static inline int valid_user_regs(CPUState *regs)
{
return 1;
}
static int
setup_sigcontext(struct target_sigcontext *sc, /*struct _fpstate *fpstate,*/
CPUState *env, unsigned long mask)
{
int err = 0;
__put_user_error(env->regs[0], &sc->arm_r0, err);
__put_user_error(env->regs[1], &sc->arm_r1, err);
__put_user_error(env->regs[2], &sc->arm_r2, err);
__put_user_error(env->regs[3], &sc->arm_r3, err);
__put_user_error(env->regs[4], &sc->arm_r4, err);
__put_user_error(env->regs[5], &sc->arm_r5, err);
__put_user_error(env->regs[6], &sc->arm_r6, err);
__put_user_error(env->regs[7], &sc->arm_r7, err);
__put_user_error(env->regs[8], &sc->arm_r8, err);
__put_user_error(env->regs[9], &sc->arm_r9, err);
__put_user_error(env->regs[10], &sc->arm_r10, err);
__put_user_error(env->regs[11], &sc->arm_fp, err);
__put_user_error(env->regs[12], &sc->arm_ip, err);
__put_user_error(env->regs[13], &sc->arm_sp, err);
__put_user_error(env->regs[14], &sc->arm_lr, err);
__put_user_error(env->regs[15], &sc->arm_pc, err);
#ifdef TARGET_CONFIG_CPU_32
__put_user_error(cpsr_read(env), &sc->arm_cpsr, err);
#endif
__put_user_error(/* current->thread.trap_no */ 0, &sc->trap_no, err);
__put_user_error(/* current->thread.error_code */ 0, &sc->error_code, err);
__put_user_error(/* current->thread.address */ 0, &sc->fault_address, err);
__put_user_error(mask, &sc->oldmask, err);
return err;
}
static inline void *
get_sigframe(struct emulated_sigaction *ka, CPUState *regs, int framesize)
{
unsigned long sp = regs->regs[13];
#if 0
/*
* This is the X/Open sanctioned signal stack switching.
*/
if ((ka->sa.sa_flags & SA_ONSTACK) && !sas_ss_flags(sp))
sp = current->sas_ss_sp + current->sas_ss_size;
#endif
/*
* ATPCS B01 mandates 8-byte alignment
*/
return g2h((sp - framesize) & ~7);
}
static int
setup_return(CPUState *env, struct emulated_sigaction *ka,
target_ulong *rc, void *frame, int usig)
{
target_ulong handler = (target_ulong)ka->sa._sa_handler;
target_ulong retcode;
int thumb = 0;
#if defined(TARGET_CONFIG_CPU_32)
#if 0
target_ulong cpsr = env->cpsr;
/*
* Maybe we need to deliver a 32-bit signal to a 26-bit task.
*/
if (ka->sa.sa_flags & SA_THIRTYTWO)
cpsr = (cpsr & ~MODE_MASK) | USR_MODE;
#ifdef CONFIG_ARM_THUMB
if (elf_hwcap & HWCAP_THUMB) {
/*
* The LSB of the handler determines if we're going to
* be using THUMB or ARM mode for this signal handler.
*/
thumb = handler & 1;
if (thumb)
cpsr |= T_BIT;
else
cpsr &= ~T_BIT;
}
#endif
#endif
#endif /* TARGET_CONFIG_CPU_32 */
if (ka->sa.sa_flags & TARGET_SA_RESTORER) {
retcode = (target_ulong)ka->sa.sa_restorer;
} else {
unsigned int idx = thumb;
if (ka->sa.sa_flags & TARGET_SA_SIGINFO)
idx += 2;
if (__put_user(retcodes[idx], rc))
return 1;
#if 0
flush_icache_range((target_ulong)rc,
(target_ulong)(rc + 1));
#endif
retcode = ((target_ulong)rc) + thumb;
}
env->regs[0] = usig;
env->regs[13] = h2g(frame);
env->regs[14] = retcode;
env->regs[15] = handler & (thumb ? ~1 : ~3);
#if 0
#ifdef TARGET_CONFIG_CPU_32
env->cpsr = cpsr;
#endif
#endif
return 0;
}
static void setup_frame(int usig, struct emulated_sigaction *ka,
target_sigset_t *set, CPUState *regs)
{
struct sigframe *frame = get_sigframe(ka, regs, sizeof(*frame));
int i, err = 0;
err |= setup_sigcontext(&frame->sc, /*&frame->fpstate,*/ regs, set->sig[0]);
for(i = 1; i < TARGET_NSIG_WORDS; i++) {
if (__put_user(set->sig[i], &frame->extramask[i - 1]))
return;
}
if (err == 0)
err = setup_return(regs, ka, &frame->retcode, frame, usig);
// return err;
}
static void setup_rt_frame(int usig, struct emulated_sigaction *ka,
target_siginfo_t *info,
target_sigset_t *set, CPUState *env)
{
struct rt_sigframe *frame = get_sigframe(ka, env, sizeof(*frame));
int i, err = 0;
if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
return /* 1 */;
__put_user_error(&frame->info, (target_ulong *)&frame->pinfo, err);
__put_user_error(&frame->uc, (target_ulong *)&frame->puc, err);
err |= copy_siginfo_to_user(&frame->info, info);
/* Clear all the bits of the ucontext we don't use. */
memset(&frame->uc, 0, offsetof(struct target_ucontext, tuc_mcontext));
err |= setup_sigcontext(&frame->uc.tuc_mcontext, /*&frame->fpstate,*/
env, set->sig[0]);
for(i = 0; i < TARGET_NSIG_WORDS; i++) {
if (__put_user(set->sig[i], &frame->uc.tuc_sigmask.sig[i]))
return;
}
if (err == 0)
err = setup_return(env, ka, &frame->retcode, frame, usig);
if (err == 0) {
/*
* For realtime signals we must also set the second and third
* arguments for the signal handler.
* -- Peter Maydell <pmaydell@chiark.greenend.org.uk> 2000-12-06
*/
env->regs[1] = (target_ulong)frame->pinfo;
env->regs[2] = (target_ulong)frame->puc;
}
// return err;
}
static int
restore_sigcontext(CPUState *env, struct target_sigcontext *sc)
{
int err = 0;
uint32_t cpsr;
__get_user_error(env->regs[0], &sc->arm_r0, err);
__get_user_error(env->regs[1], &sc->arm_r1, err);
__get_user_error(env->regs[2], &sc->arm_r2, err);
__get_user_error(env->regs[3], &sc->arm_r3, err);
__get_user_error(env->regs[4], &sc->arm_r4, err);
__get_user_error(env->regs[5], &sc->arm_r5, err);
__get_user_error(env->regs[6], &sc->arm_r6, err);
__get_user_error(env->regs[7], &sc->arm_r7, err);
__get_user_error(env->regs[8], &sc->arm_r8, err);
__get_user_error(env->regs[9], &sc->arm_r9, err);
__get_user_error(env->regs[10], &sc->arm_r10, err);
__get_user_error(env->regs[11], &sc->arm_fp, err);
__get_user_error(env->regs[12], &sc->arm_ip, err);
__get_user_error(env->regs[13], &sc->arm_sp, err);
__get_user_error(env->regs[14], &sc->arm_lr, err);
__get_user_error(env->regs[15], &sc->arm_pc, err);
#ifdef TARGET_CONFIG_CPU_32
__get_user_error(cpsr, &sc->arm_cpsr, err);
cpsr_write(env, cpsr, 0xffffffff);
#endif
err |= !valid_user_regs(env);
return err;
}
long do_sigreturn(CPUState *env)
{
struct sigframe *frame;
target_sigset_t set;
sigset_t host_set;
int i;
/*
* Since we stacked the signal on a 64-bit boundary,
* then 'sp' should be word aligned here. If it's
* not, then the user is trying to mess with us.
*/
if (env->regs[13] & 7)
goto badframe;
frame = (struct sigframe *)g2h(env->regs[13]);
#if 0
if (verify_area(VERIFY_READ, frame, sizeof (*frame)))
goto badframe;
#endif
if (__get_user(set.sig[0], &frame->sc.oldmask))
goto badframe;
for(i = 1; i < TARGET_NSIG_WORDS; i++) {
if (__get_user(set.sig[i], &frame->extramask[i - 1]))
goto badframe;
}
target_to_host_sigset_internal(&host_set, &set);
sigprocmask(SIG_SETMASK, &host_set, NULL);
if (restore_sigcontext(env, &frame->sc))
goto badframe;
#if 0
/* Send SIGTRAP if we're single-stepping */
if (ptrace_cancel_bpt(current))
send_sig(SIGTRAP, current, 1);
#endif
return env->regs[0];
badframe:
force_sig(SIGSEGV /* , current */);
return 0;
}
long do_rt_sigreturn(CPUState *env)
{
struct rt_sigframe *frame;
sigset_t host_set;
/*
* Since we stacked the signal on a 64-bit boundary,
* then 'sp' should be word aligned here. If it's
* not, then the user is trying to mess with us.
*/
if (env->regs[13] & 7)
goto badframe;
frame = (struct rt_sigframe *)env->regs[13];
#if 0
if (verify_area(VERIFY_READ, frame, sizeof (*frame)))
goto badframe;
#endif
target_to_host_sigset(&host_set, &frame->uc.tuc_sigmask);
sigprocmask(SIG_SETMASK, &host_set, NULL);
if (restore_sigcontext(env, &frame->uc.tuc_mcontext))
goto badframe;
#if 0
/* Send SIGTRAP if we're single-stepping */
if (ptrace_cancel_bpt(current))
send_sig(SIGTRAP, current, 1);
#endif
return env->regs[0];
badframe:
force_sig(SIGSEGV /* , current */);
return 0;
}
#elif defined(TARGET_SPARC)
#define __SUNOS_MAXWIN 31
/* This is what SunOS does, so shall I. */
struct target_sigcontext {
target_ulong sigc_onstack; /* state to restore */
target_ulong sigc_mask; /* sigmask to restore */
target_ulong sigc_sp; /* stack pointer */
target_ulong sigc_pc; /* program counter */
target_ulong sigc_npc; /* next program counter */
target_ulong sigc_psr; /* for condition codes etc */
target_ulong sigc_g1; /* User uses these two registers */
target_ulong sigc_o0; /* within the trampoline code. */
/* Now comes information regarding the users window set
* at the time of the signal.
*/
target_ulong sigc_oswins; /* outstanding windows */
/* stack ptrs for each regwin buf */
char *sigc_spbuf[__SUNOS_MAXWIN];
/* Windows to restore after signal */
struct {
target_ulong locals[8];
target_ulong ins[8];
} sigc_wbuf[__SUNOS_MAXWIN];
};
/* A Sparc stack frame */
struct sparc_stackf {
target_ulong locals[8];
target_ulong ins[6];
struct sparc_stackf *fp;
target_ulong callers_pc;
char *structptr;
target_ulong xargs[6];
target_ulong xxargs[1];
};
typedef struct {
struct {
target_ulong psr;
target_ulong pc;
target_ulong npc;
target_ulong y;
target_ulong u_regs[16]; /* globals and ins */
} si_regs;
int si_mask;
} __siginfo_t;
typedef struct {
unsigned long si_float_regs [32];
unsigned long si_fsr;
unsigned long si_fpqdepth;
struct {
unsigned long *insn_addr;
unsigned long insn;
} si_fpqueue [16];
} qemu_siginfo_fpu_t;
struct target_signal_frame {
struct sparc_stackf ss;
__siginfo_t info;
qemu_siginfo_fpu_t *fpu_save;
target_ulong insns[2] __attribute__ ((aligned (8)));
target_ulong extramask[TARGET_NSIG_WORDS - 1];
target_ulong extra_size; /* Should be 0 */
qemu_siginfo_fpu_t fpu_state;
};
struct target_rt_signal_frame {
struct sparc_stackf ss;
siginfo_t info;
target_ulong regs[20];
sigset_t mask;
qemu_siginfo_fpu_t *fpu_save;
unsigned int insns[2];
stack_t stack;
unsigned int extra_size; /* Should be 0 */
qemu_siginfo_fpu_t fpu_state;
};
#define UREG_O0 16
#define UREG_O6 22
#define UREG_I0 0
#define UREG_I1 1
#define UREG_I2 2
#define UREG_I6 6
#define UREG_I7 7
#define UREG_L0 8
#define UREG_FP UREG_I6
#define UREG_SP UREG_O6
static inline void *get_sigframe(struct emulated_sigaction *sa, CPUState *env, unsigned long framesize)
{
unsigned long sp;
sp = env->regwptr[UREG_FP];
#if 0
/* This is the X/Open sanctioned signal stack switching. */
if (sa->sa_flags & TARGET_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;
}
#endif
return g2h(sp - framesize);
}
static int
setup___siginfo(__siginfo_t *si, CPUState *env, target_ulong mask)
{
int err = 0, i;
err |= __put_user(env->psr, &si->si_regs.psr);
err |= __put_user(env->pc, &si->si_regs.pc);
err |= __put_user(env->npc, &si->si_regs.npc);
err |= __put_user(env->y, &si->si_regs.y);
for (i=0; i < 8; i++) {
err |= __put_user(env->gregs[i], &si->si_regs.u_regs[i]);
}
for (i=0; i < 8; i++) {
err |= __put_user(env->regwptr[UREG_I0 + i], &si->si_regs.u_regs[i+8]);
}
err |= __put_user(mask, &si->si_mask);
return err;
}
#if 0
static int
setup_sigcontext(struct target_sigcontext *sc, /*struct _fpstate *fpstate,*/
CPUState *env, unsigned long mask)
{
int err = 0;
err |= __put_user(mask, &sc->sigc_mask);
err |= __put_user(env->regwptr[UREG_SP], &sc->sigc_sp);
err |= __put_user(env->pc, &sc->sigc_pc);
err |= __put_user(env->npc, &sc->sigc_npc);
err |= __put_user(env->psr, &sc->sigc_psr);
err |= __put_user(env->gregs[1], &sc->sigc_g1);
err |= __put_user(env->regwptr[UREG_O0], &sc->sigc_o0);
return err;
}
#endif
#define NF_ALIGNEDSZ (((sizeof(struct target_signal_frame) + 7) & (~7)))
static void setup_frame(int sig, struct emulated_sigaction *ka,
target_sigset_t *set, CPUState *env)
{
struct target_signal_frame *sf;
int sigframe_size, err, i;
/* 1. Make sure everything is clean */
//synchronize_user_stack();
sigframe_size = NF_ALIGNEDSZ;
sf = (struct target_signal_frame *)
get_sigframe(ka, env, sigframe_size);
//fprintf(stderr, "sf: %x pc %x fp %x sp %x\n", sf, env->pc, env->regwptr[UREG_FP], env->regwptr[UREG_SP]);
#if 0
if (invalid_frame_pointer(sf, sigframe_size))
goto sigill_and_return;
#endif
/* 2. Save the current process state */
err = setup___siginfo(&sf->info, env, set->sig[0]);
err |= __put_user(0, &sf->extra_size);
//err |= save_fpu_state(regs, &sf->fpu_state);
//err |= __put_user(&sf->fpu_state, &sf->fpu_save);
err |= __put_user(set->sig[0], &sf->info.si_mask);
for (i = 0; i < TARGET_NSIG_WORDS - 1; i++) {
err |= __put_user(set->sig[i + 1], &sf->extramask[i]);
}
for (i = 0; i < 8; i++) {
err |= __put_user(env->regwptr[i + UREG_L0], &sf->ss.locals[i]);
}
for (i = 0; i < 8; i++) {
err |= __put_user(env->regwptr[i + UREG_I0], &sf->ss.ins[i]);
}
if (err)
goto sigsegv;
/* 3. signal handler back-trampoline and parameters */
env->regwptr[UREG_FP] = h2g(sf);
env->regwptr[UREG_I0] = sig;
env->regwptr[UREG_I1] = h2g(&sf->info);
env->regwptr[UREG_I2] = h2g(&sf->info);
/* 4. signal handler */
env->pc = (unsigned long) ka->sa._sa_handler;
env->npc = (env->pc + 4);
/* 5. return to kernel instructions */
if (ka->sa.sa_restorer)
env->regwptr[UREG_I7] = (unsigned long)ka->sa.sa_restorer;
else {
env->regwptr[UREG_I7] = h2g(&(sf->insns[0]) - 2);
/* mov __NR_sigreturn, %g1 */
err |= __put_user(0x821020d8, &sf->insns[0]);
/* t 0x10 */
err |= __put_user(0x91d02010, &sf->insns[1]);
if (err)
goto sigsegv;
/* Flush instruction space. */
//flush_sig_insns(current->mm, (unsigned long) &(sf->insns[0]));
// tb_flush(env);
}
return;
//sigill_and_return:
force_sig(TARGET_SIGILL);
sigsegv:
//fprintf(stderr, "force_sig\n");
force_sig(TARGET_SIGSEGV);
}
static inline int
restore_fpu_state(CPUState *env, qemu_siginfo_fpu_t *fpu)
{
int err;
#if 0
#ifdef CONFIG_SMP
if (current->flags & PF_USEDFPU)
regs->psr &= ~PSR_EF;
#else
if (current == last_task_used_math) {
last_task_used_math = 0;
regs->psr &= ~PSR_EF;
}
#endif
current->used_math = 1;
current->flags &= ~PF_USEDFPU;
#endif
#if 0
if (verify_area (VERIFY_READ, fpu, sizeof(*fpu)))
return -EFAULT;
#endif
#if 0
/* XXX: incorrect */
err = __copy_from_user(&env->fpr[0], &fpu->si_float_regs[0],
(sizeof(unsigned long) * 32));
#endif
err |= __get_user(env->fsr, &fpu->si_fsr);
#if 0
err |= __get_user(current->thread.fpqdepth, &fpu->si_fpqdepth);
if (current->thread.fpqdepth != 0)
err |= __copy_from_user(&current->thread.fpqueue[0],
&fpu->si_fpqueue[0],
((sizeof(unsigned long) +
(sizeof(unsigned long *)))*16));
#endif
return err;
}
static void setup_rt_frame(int sig, struct emulated_sigaction *ka,
target_siginfo_t *info,
target_sigset_t *set, CPUState *env)
{
fprintf(stderr, "setup_rt_frame: not implemented\n");
}
long do_sigreturn(CPUState *env)
{
struct target_signal_frame *sf;
uint32_t up_psr, pc, npc;
target_sigset_t set;
sigset_t host_set;
target_ulong fpu_save;
int err, i;
sf = (struct target_signal_frame *)g2h(env->regwptr[UREG_FP]);
#if 0
fprintf(stderr, "sigreturn\n");
fprintf(stderr, "sf: %x pc %x fp %x sp %x\n", sf, env->pc, env->regwptr[UREG_FP], env->regwptr[UREG_SP]);
#endif
//cpu_dump_state(env, stderr, fprintf, 0);
/* 1. Make sure we are not getting garbage from the user */
#if 0
if (verify_area (VERIFY_READ, sf, sizeof (*sf)))
goto segv_and_exit;
#endif
if (((uint) sf) & 3)
goto segv_and_exit;
err = __get_user(pc, &sf->info.si_regs.pc);
err |= __get_user(npc, &sf->info.si_regs.npc);
if ((pc | npc) & 3)
goto segv_and_exit;
/* 2. Restore the state */
err |= __get_user(up_psr, &sf->info.si_regs.psr);
/* User can only change condition codes and FPU enabling in %psr. */
env->psr = (up_psr & (PSR_ICC /* | PSR_EF */))
| (env->psr & ~(PSR_ICC /* | PSR_EF */));
env->pc = pc;
env->npc = npc;
err |= __get_user(env->y, &sf->info.si_regs.y);
for (i=0; i < 8; i++) {
err |= __get_user(env->gregs[i], &sf->info.si_regs.u_regs[i]);
}
for (i=0; i < 8; i++) {
err |= __get_user(env->regwptr[i + UREG_I0], &sf->info.si_regs.u_regs[i+8]);
}
err |= __get_user(fpu_save, (target_ulong *)&sf->fpu_save);
//if (fpu_save)
// err |= restore_fpu_state(env, fpu_save);
/* This is pretty much atomic, no amount locking would prevent
* the races which exist anyways.
*/
err |= __get_user(set.sig[0], &sf->info.si_mask);
for(i = 1; i < TARGET_NSIG_WORDS; i++) {
err |= (__get_user(set.sig[i], &sf->extramask[i - 1]));
}
target_to_host_sigset_internal(&host_set, &set);
sigprocmask(SIG_SETMASK, &host_set, NULL);
if (err)
goto segv_and_exit;
return env->regwptr[0];
segv_and_exit:
force_sig(TARGET_SIGSEGV);
}
long do_rt_sigreturn(CPUState *env)
{
fprintf(stderr, "do_rt_sigreturn: not implemented\n");
return -ENOSYS;
}
#elif defined(TARGET_MIPS)
struct target_sigcontext {
uint32_t sc_regmask; /* Unused */
uint32_t sc_status;
uint64_t sc_pc;
uint64_t sc_regs[32];
uint64_t sc_fpregs[32];
uint32_t sc_ownedfp; /* Unused */
uint32_t sc_fpc_csr;
uint32_t sc_fpc_eir; /* Unused */
uint32_t sc_used_math;
uint32_t sc_dsp; /* dsp status, was sc_ssflags */
uint64_t sc_mdhi;
uint64_t sc_mdlo;
target_ulong sc_hi1; /* Was sc_cause */
target_ulong sc_lo1; /* Was sc_badvaddr */
target_ulong sc_hi2; /* Was sc_sigset[4] */
target_ulong sc_lo2;
target_ulong sc_hi3;
target_ulong sc_lo3;
};
struct sigframe {
uint32_t sf_ass[4]; /* argument save space for o32 */
uint32_t sf_code[2]; /* signal trampoline */
struct target_sigcontext sf_sc;
target_sigset_t sf_mask;
};
/* Install trampoline to jump back from signal handler */
static inline int install_sigtramp(unsigned int *tramp, unsigned int syscall)
{
int err;
/*
* Set up the return code ...
*
* li v0, __NR__foo_sigreturn
* syscall
*/
err = __put_user(0x24020000 + syscall, tramp + 0);
err |= __put_user(0x0000000c , tramp + 1);
/* flush_cache_sigtramp((unsigned long) tramp); */
return err;
}
static inline int
setup_sigcontext(CPUState *regs, struct target_sigcontext *sc)
{
int err = 0;
err |= __put_user(regs->PC, &sc->sc_pc);
#define save_gp_reg(i) do { \
err |= __put_user(regs->gpr[i], &sc->sc_regs[i]); \
} while(0)
__put_user(0, &sc->sc_regs[0]); save_gp_reg(1); save_gp_reg(2);
save_gp_reg(3); save_gp_reg(4); save_gp_reg(5); save_gp_reg(6);
save_gp_reg(7); save_gp_reg(8); save_gp_reg(9); save_gp_reg(10);
save_gp_reg(11); save_gp_reg(12); save_gp_reg(13); save_gp_reg(14);
save_gp_reg(15); save_gp_reg(16); save_gp_reg(17); save_gp_reg(18);
save_gp_reg(19); save_gp_reg(20); save_gp_reg(21); save_gp_reg(22);
save_gp_reg(23); save_gp_reg(24); save_gp_reg(25); save_gp_reg(26);
save_gp_reg(27); save_gp_reg(28); save_gp_reg(29); save_gp_reg(30);
save_gp_reg(31);
#undef save_gp_reg
err |= __put_user(regs->HI, &sc->sc_mdhi);
err |= __put_user(regs->LO, &sc->sc_mdlo);
/* Not used yet, but might be useful if we ever have DSP suppport */
#if 0
if (cpu_has_dsp) {
err |= __put_user(mfhi1(), &sc->sc_hi1);
err |= __put_user(mflo1(), &sc->sc_lo1);
err |= __put_user(mfhi2(), &sc->sc_hi2);
err |= __put_user(mflo2(), &sc->sc_lo2);
err |= __put_user(mfhi3(), &sc->sc_hi3);
err |= __put_user(mflo3(), &sc->sc_lo3);
err |= __put_user(rddsp(DSP_MASK), &sc->sc_dsp);
}
/* same with 64 bit */
#ifdef CONFIG_64BIT
err |= __put_user(regs->hi, &sc->sc_hi[0]);
err |= __put_user(regs->lo, &sc->sc_lo[0]);
if (cpu_has_dsp) {
err |= __put_user(mfhi1(), &sc->sc_hi[1]);
err |= __put_user(mflo1(), &sc->sc_lo[1]);
err |= __put_user(mfhi2(), &sc->sc_hi[2]);
err |= __put_user(mflo2(), &sc->sc_lo[2]);
err |= __put_user(mfhi3(), &sc->sc_hi[3]);
err |= __put_user(mflo3(), &sc->sc_lo[3]);
err |= __put_user(rddsp(DSP_MASK), &sc->sc_dsp);
}
#endif
#endif
#if 0
err |= __put_user(!!used_math(), &sc->sc_used_math);
if (!used_math())
goto out;
/*
* Save FPU state to signal context. Signal handler will "inherit"
* current FPU state.
*/
preempt_disable();
if (!is_fpu_owner()) {
own_fpu();
restore_fp(current);
}
err |= save_fp_context(sc);
preempt_enable();
out:
#endif
return err;
}
static inline int
restore_sigcontext(CPUState *regs, struct target_sigcontext *sc)
{
int err = 0;
err |= __get_user(regs->CP0_EPC, &sc->sc_pc);
err |= __get_user(regs->HI, &sc->sc_mdhi);
err |= __get_user(regs->LO, &sc->sc_mdlo);
#define restore_gp_reg(i) do { \
err |= __get_user(regs->gpr[i], &sc->sc_regs[i]); \
} while(0)
restore_gp_reg( 1); restore_gp_reg( 2); restore_gp_reg( 3);
restore_gp_reg( 4); restore_gp_reg( 5); restore_gp_reg( 6);
restore_gp_reg( 7); restore_gp_reg( 8); restore_gp_reg( 9);
restore_gp_reg(10); restore_gp_reg(11); restore_gp_reg(12);
restore_gp_reg(13); restore_gp_reg(14); restore_gp_reg(15);
restore_gp_reg(16); restore_gp_reg(17); restore_gp_reg(18);
restore_gp_reg(19); restore_gp_reg(20); restore_gp_reg(21);
restore_gp_reg(22); restore_gp_reg(23); restore_gp_reg(24);
restore_gp_reg(25); restore_gp_reg(26); restore_gp_reg(27);
restore_gp_reg(28); restore_gp_reg(29); restore_gp_reg(30);
restore_gp_reg(31);
#undef restore_gp_reg
#if 0
if (cpu_has_dsp) {
err |= __get_user(treg, &sc->sc_hi1); mthi1(treg);
err |= __get_user(treg, &sc->sc_lo1); mtlo1(treg);
err |= __get_user(treg, &sc->sc_hi2); mthi2(treg);
err |= __get_user(treg, &sc->sc_lo2); mtlo2(treg);
err |= __get_user(treg, &sc->sc_hi3); mthi3(treg);
err |= __get_user(treg, &sc->sc_lo3); mtlo3(treg);
err |= __get_user(treg, &sc->sc_dsp); wrdsp(treg, DSP_MASK);
}
#ifdef CONFIG_64BIT
err |= __get_user(regs->hi, &sc->sc_hi[0]);
err |= __get_user(regs->lo, &sc->sc_lo[0]);
if (cpu_has_dsp) {
err |= __get_user(treg, &sc->sc_hi[1]); mthi1(treg);
err |= __get_user(treg, &sc->sc_lo[1]); mthi1(treg);
err |= __get_user(treg, &sc->sc_hi[2]); mthi2(treg);
err |= __get_user(treg, &sc->sc_lo[2]); mthi2(treg);
err |= __get_user(treg, &sc->sc_hi[3]); mthi3(treg);
err |= __get_user(treg, &sc->sc_lo[3]); mthi3(treg);
err |= __get_user(treg, &sc->sc_dsp); wrdsp(treg, DSP_MASK);
}
#endif
err |= __get_user(used_math, &sc->sc_used_math);
conditional_used_math(used_math);
preempt_disable();
if (used_math()) {
/* restore fpu context if we have used it before */
own_fpu();
err |= restore_fp_context(sc);
} else {
/* signal handler may have used FPU. Give it up. */
lose_fpu();
}
preempt_enable();
#endif
return err;
}
/*
* Determine which stack to use..
*/
static inline void *
get_sigframe(struct emulated_sigaction *ka, CPUState *regs, size_t frame_size)
{
unsigned long sp;
/* Default to using normal stack */
sp = regs->gpr[29];
/*
* FPU emulator may have it's own trampoline active just
* above the user stack, 16-bytes before the next lowest
* 16 byte boundary. Try to avoid trashing it.
*/
sp -= 32;
#if 0
/* This is the X/Open sanctioned signal stack switching. */
if ((ka->sa.sa_flags & SA_ONSTACK) && (sas_ss_flags (sp) == 0))
sp = current->sas_ss_sp + current->sas_ss_size;
#endif
return g2h((sp - frame_size) & ~7);
}
static void setup_frame(int sig, struct emulated_sigaction * ka,
target_sigset_t *set, CPUState *regs)
{
struct sigframe *frame;
int i;
frame = get_sigframe(ka, regs, sizeof(*frame));
if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
goto give_sigsegv;
install_sigtramp(frame->sf_code, TARGET_NR_sigreturn);
if(setup_sigcontext(regs, &frame->sf_sc))
goto give_sigsegv;
for(i = 0; i < TARGET_NSIG_WORDS; i++) {
if(__put_user(set->sig[i], &frame->sf_mask.sig[i]))
goto give_sigsegv;
}
/*
* Arguments to signal handler:
*
* a0 = signal number
* a1 = 0 (should be cause)
* a2 = pointer to struct sigcontext
*
* $25 and PC point to the signal handler, $29 points to the
* struct sigframe.
*/
regs->gpr[ 4] = sig;
regs->gpr[ 5] = 0;
regs->gpr[ 6] = h2g(&frame->sf_sc);
regs->gpr[29] = h2g(frame);
regs->gpr[31] = h2g(frame->sf_code);
/* The original kernel code sets CP0_EPC to the handler
* since it returns to userland using eret
* we cannot do this here, and we must set PC directly */
regs->PC = regs->gpr[25] = ka->sa._sa_handler;
return;
give_sigsegv:
force_sig(TARGET_SIGSEGV/*, current*/);
return;
}
long do_sigreturn(CPUState *regs)
{
struct sigframe *frame;
sigset_t blocked;
target_sigset_t target_set;
int i;
#if defined(DEBUG_SIGNAL)
fprintf(stderr, "do_sigreturn\n");
#endif
frame = (struct sigframe *) regs->gpr[29];
if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
goto badframe;
for(i = 0; i < TARGET_NSIG_WORDS; i++) {
if(__get_user(target_set.sig[i], &frame->sf_mask.sig[i]))
goto badframe;
}
target_to_host_sigset_internal(&blocked, &target_set);
sigprocmask(SIG_SETMASK, &blocked, NULL);
if (restore_sigcontext(regs, &frame->sf_sc))
goto badframe;
#if 0
/*
* Don't let your children do this ...
*/
__asm__ __volatile__(
"move\t$29, %0\n\t"
"j\tsyscall_exit"
:/* no outputs */
:"r" (&regs));
/* Unreached */
#endif
regs->PC = regs->CP0_EPC;
/* I am not sure this is right, but it seems to work
* maybe a problem with nested signals ? */
regs->CP0_EPC = 0;
return 0;
badframe:
force_sig(TARGET_SIGSEGV/*, current*/);
return 0;
}
static void setup_rt_frame(int sig, struct emulated_sigaction *ka,
target_siginfo_t *info,
target_sigset_t *set, CPUState *env)
{
fprintf(stderr, "setup_rt_frame: not implemented\n");
}
long do_rt_sigreturn(CPUState *env)
{
fprintf(stderr, "do_rt_sigreturn: not implemented\n");
return -ENOSYS;
}
#else
static void setup_frame(int sig, struct emulated_sigaction *ka,
target_sigset_t *set, CPUState *env)
{
fprintf(stderr, "setup_frame: not implemented\n");
}
static void setup_rt_frame(int sig, struct emulated_sigaction *ka,
target_siginfo_t *info,
target_sigset_t *set, CPUState *env)
{
fprintf(stderr, "setup_rt_frame: not implemented\n");
}
long do_sigreturn(CPUState *env)
{
fprintf(stderr, "do_sigreturn: not implemented\n");
return -ENOSYS;
}
long do_rt_sigreturn(CPUState *env)
{
fprintf(stderr, "do_rt_sigreturn: not implemented\n");
return -ENOSYS;
}
#endif
void process_pending_signals(void *cpu_env)
{
int sig;
target_ulong handler;
sigset_t set, old_set;
target_sigset_t target_old_set;
struct emulated_sigaction *k;
struct sigqueue *q;
if (!signal_pending)
return;
k = sigact_table;
for(sig = 1; sig <= TARGET_NSIG; sig++) {
if (k->pending)
goto handle_signal;
k++;
}
/* if no signal is pending, just return */
signal_pending = 0;
return;
handle_signal:
#ifdef DEBUG_SIGNAL
fprintf(stderr, "qemu: process signal %d\n", sig);
#endif
/* dequeue signal */
q = k->first;
k->first = q->next;
if (!k->first)
k->pending = 0;
sig = gdb_handlesig (cpu_env, sig);
if (!sig) {
fprintf (stderr, "Lost signal\n");
abort();
}
handler = k->sa._sa_handler;
if (handler == TARGET_SIG_DFL) {
/* default handler : ignore some signal. The other are fatal */
if (sig != TARGET_SIGCHLD &&
sig != TARGET_SIGURG &&
sig != TARGET_SIGWINCH) {
force_sig(sig);
}
} else if (handler == TARGET_SIG_IGN) {
/* ignore sig */
} else if (handler == TARGET_SIG_ERR) {
force_sig(sig);
} else {
/* compute the blocked signals during the handler execution */
target_to_host_sigset(&set, &k->sa.sa_mask);
/* SA_NODEFER indicates that the current signal should not be
blocked during the handler */
if (!(k->sa.sa_flags & TARGET_SA_NODEFER))
sigaddset(&set, target_to_host_signal(sig));
/* block signals in the handler using Linux */
sigprocmask(SIG_BLOCK, &set, &old_set);
/* save the previous blocked signal state to restore it at the
end of the signal execution (see do_sigreturn) */
host_to_target_sigset_internal(&target_old_set, &old_set);
/* if the CPU is in VM86 mode, we restore the 32 bit values */
#if defined(TARGET_I386) && !defined(TARGET_X86_64)
{
CPUX86State *env = cpu_env;
if (env->eflags & VM_MASK)
save_v86_state(env);
}
#endif
/* prepare the stack frame of the virtual CPU */
if (k->sa.sa_flags & TARGET_SA_SIGINFO)
setup_rt_frame(sig, k, &q->info, &target_old_set, cpu_env);
else
setup_frame(sig, k, &target_old_set, cpu_env);
if (k->sa.sa_flags & TARGET_SA_RESETHAND)
k->sa._sa_handler = TARGET_SIG_DFL;
}
if (q != &k->info)
free_sigqueue(q);
}
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