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basic signal handling 

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@41 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
bellard 2003-03-23 01:06:05 +00:00
parent 1b6b029e40
commit 66fb9763af
9 changed files with 1060 additions and 101 deletions
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2
Makefile
View File

@ -36,7 +36,7 @@ LDFLAGS+=-p
main.o: CFLAGS+=-p
endif
OBJS= elfload.o main.o thunk.o syscall.o libgemu.a
OBJS= elfload.o main.o thunk.o syscall.o signal.o libgemu.a
LIBOBJS+=translate-i386.o op-i386.o exec-i386.o
# NOTE: the disassembler code is only needed for debugging

4
TODO
View File

@ -1,5 +1,7 @@
- asynchronous signal interrupt / clear synchronous signal handling
- add eflags restore in emulator
- finish signal handing (fp87 state)
- verify thread support (clone() and various locks)
- signals
- optimize translated cache chaining (DLL PLT-like system)
- vm86 syscall support
- overrides/16bit for string ops

6
linux-user/main.c
View File

@ -81,10 +81,6 @@ int cpu_x86_inl(int addr)
return 0;
}
/* default linux values for the selectors */
#define __USER_CS (0x23)
#define __USER_DS (0x2B)
void write_dt(void *ptr, unsigned long addr, unsigned long limit,
int seg32_bit)
{
@ -135,6 +131,7 @@ void cpu_loop(struct CPUX86State *env)
(long)pc, err);
abort();
}
process_pending_signals(env);
}
}
@ -199,6 +196,7 @@ int main(int argc, char **argv)
target_set_brk((char *)info->brk);
syscall_init();
signal_init();
env = cpu_x86_init();

10
linux-user/qemu.h
View File

@ -3,6 +3,12 @@
#include "thunk.h"
#ifdef TARGET_I386
/* default linux values for the selectors */
#define __USER_CS (0x23)
#define __USER_DS (0x2B)
struct target_pt_regs {
long ebx;
long ecx;
@ -21,6 +27,8 @@ struct target_pt_regs {
int xss;
};
#endif
/* This struct is used to hold certain information about the image.
* Basically, it replicates in user space what would be certain
* task_struct fields in the kernel
@ -53,5 +61,7 @@ long do_syscall(void *cpu_env, int num, long arg1, long arg2, long arg3,
void gemu_log(const char *fmt, ...) __attribute__((format(printf,1,2)));
struct CPUX86State;
void cpu_loop(struct CPUX86State *env);
void process_pending_signals(void *cpu_env);
void signal_init(void);
#endif

743
linux-user/signal.c
View File

@ -1,5 +1,5 @@
/*
* Emulation of Linux signal handling
* Emulation of Linux signals
*
* Copyright (c) 2003 Fabrice Bellard
*
@ -19,22 +19,49 @@
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <stdarg.h>
#include <signal.h>
#include <errno.h>
#include <sys/ucontext.h>
/* Algorithm strongly inspired from em86 : we queue the signals so
that we can handle them at precise points in the emulated code. */
#include "gemu.h"
#include "syscall_defs.h"
#ifdef TARGET_I386
#include "cpu-i386.h"
#include "syscall-i386.h"
#endif
/* signal handling inspired from em86. */
//#define DEBUG_SIGNAL
#define MAX_SIGQUEUE_SIZE 1024
struct sigqueue {
struct sigqueue *next;
siginfo_t info;
};
struct emulated_sigaction {
struct target_sigaction sa;
int nb_pending;
struct target_siginfo info;
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 */
};
struct emulated_sigaction sigact_table[NSIG];
int signal_pending;
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);
/* XXX: do it properly */
static inline int host_to_target_signal(int sig)
{
return sig;
@ -45,6 +72,51 @@ static inline int target_to_host_signal(int sig)
return sig;
}
void host_to_target_sigset(target_sigset_t *d, sigset_t *s)
{
int i;
for(i = 0;i < TARGET_NSIG_WORDS; i++) {
d->sig[i] = tswapl(((unsigned long *)s)[i]);
}
}
void target_to_host_sigset(sigset_t *d, target_sigset_t *s)
{
int i;
for(i = 0;i < TARGET_NSIG_WORDS; i++) {
((unsigned long *)d)[i] = tswapl(s->sig[i]);
}
}
void host_to_target_old_sigset(target_ulong *old_sigset,
const sigset_t *sigset)
{
*old_sigset = tswap32(*(unsigned long *)sigset & 0xffffffff);
}
void target_to_host_old_sigset(sigset_t *sigset,
const target_ulong *old_sigset)
{
sigemptyset(sigset);
*(unsigned long *)sigset = tswapl(*old_sigset);
}
/* XXX: finish it */
void host_to_target_siginfo(target_siginfo_t *tinfo, siginfo_t *info)
{
tinfo->si_signo = tswap32(info->si_signo);
tinfo->si_errno = tswap32(info->si_errno);
tinfo->si_code = tswap32(info->si_code);
}
/* XXX: finish it */
void target_to_host_siginfo(siginfo_t *info, 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);
}
void signal_init(void)
{
struct sigaction act;
@ -55,51 +127,664 @@ void signal_init(void)
act.sa_flags = SA_SIGINFO;
act.sa_sigaction = host_signal_handler;
for(i = 1; i < NSIG; i++) {
sigaction(i, &sa, NULL);
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;
}
static int queue_signal(struct emulated_sigaction *k, int sig, siginfo_t *info)
{
struct sigqueue *q, **pq;
pq = &k->first;
if (!k->pending || sig < TARGET_SIGRTMIN) {
/* first signal or non real time 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 0;
}
void force_sig(int sig)
{
int host_sig;
/* abort execution with signal */
host_sig = target_to_host_signal(sig);
fprintf(stderr, "gemu: uncaught target signal %d (%s) - exiting\n",
sig, strsignal(host_sig));
_exit(-host_sig);
}
static void host_signal_handler(int host_signum, siginfo_t *info,
void *puc)
{
struct ucontext *uc = puc;
int signum;
struct emulated_sigaction *k;
int sig;
target_ulong handler;
/* get target signal number */
signum = host_to_target(host_signum);
if (signum >= TARGET_NSIG)
sig = host_to_target_signal(host_signum);
if (sig < 1 || sig > TARGET_NSIG)
return;
/* we save the old mask */
k = &sigact_table[sig - 1];
#ifdef DEBUG_SIGNAL
fprintf(stderr, "gemu: got signal %d\n", sig);
#endif
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 signal */
} else if (handler == TARGET_SIG_ERR) {
force_sig(sig);
} else {
queue_signal(k, sig, info);
}
}
void process_pending_signals(void)
int do_sigaction(int sig, const struct target_sigaction *act,
struct target_sigaction *oact)
{
int signum;
target_ulong _sa_handler;
struct emulated_sigaction *k;
struct emulated_sigaction *esig;
if (sig < 1 || sig > TARGET_NSIG)
return -EINVAL;
k = &sigact_table[sig - 1];
#if defined(DEBUG_SIGNAL) && 0
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);
oact->sa_restorer = tswapl(k->sa.sa_restorer);
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);
k->sa.sa_restorer = tswapl(act->sa_restorer);
k->sa.sa_mask = act->sa_mask;
}
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 uc_flags;
target_ulong uc_link;
target_stack_t uc_stack;
struct target_sigcontext uc_mcontext;
target_sigset_t uc_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.
*/
#define __put_user(x,ptr)\
({\
int size = sizeof(*ptr);\
switch(size) {\
case 1:\
stb(ptr, (typeof(*ptr))(x));\
break;\
case 2:\
stw(ptr, (typeof(*ptr))(x));\
break;\
case 4:\
stl(ptr, (typeof(*ptr))(x));\
break;\
case 8:\
stq(ptr, (typeof(*ptr))(x));\
break;\
default:\
abort();\
}\
0;\
})
#define get_user(val, ptr) (typeof(*ptr))(*(ptr))
#define __copy_to_user(dst, src, size)\
({\
memcpy(dst, src, size);\
0;\
})
static inline int copy_siginfo_to_user(target_siginfo_t *tinfo, siginfo_t *info)
{
host_to_target_siginfo(tinfo, info);
return 0;
}
/* 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], (unsigned int *)&sc->gs);
err |= __put_user(env->segs[R_FS], (unsigned int *)&sc->fs);
err |= __put_user(env->segs[R_ES], (unsigned int *)&sc->es);
err |= __put_user(env->segs[R_DS], (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(/*current->thread.trap_no*/ 0, &sc->trapno);
err |= __put_user(/*current->thread.error_code*/ 0, &sc->err);
err |= __put_user(env->eip, &sc->eip);
err |= __put_user(env->segs[R_CS], (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], (unsigned int *)&sc->ss);
#if 0
tmp = save_i387(fpstate);
if (tmp < 0)
err = 1;
else
err |= __put_user(tmp ? fpstate : NULL, &sc->fpstate);
#else
err |= __put_user(0, &sc->fpstate);
#endif
/* non-iBCS2 extensions.. */
err |= __put_user(mask, &sc->oldmask);
err |= __put_user(/*current->thread.cr2*/ 0, &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 if ((regs->xss & 0xffff) != __USER_DS &&
!(ka->sa.sa_flags & SA_RESTORER) &&
ka->sa.sa_restorer) {
esp = (unsigned long) ka->sa.sa_restorer;
}
#endif
return (void *)((esp - frame_size) & -8ul);
}
#define TF_MASK TRAP_FLAG
static void setup_frame(int sig, struct emulated_sigaction *ka,
target_sigset_t *set, CPUX86State *env)
{
struct sigframe *frame;
int err = 0;
frame = get_sigframe(ka, env, sizeof(*frame));
#if 0
if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
goto give_sigsegv;
#endif
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;
if (TARGET_NSIG_WORDS > 1) {
err |= __copy_to_user(frame->extramask, &set->sig[1],
sizeof(frame->extramask));
}
if (err)
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));
err |= __put_user(TARGET_NR_sigreturn, (int *)(frame->retcode+2));
err |= __put_user(0x80cd, (short *)(frame->retcode+6));
}
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 void setup_rt_frame(int sig, struct emulated_sigaction *ka, siginfo_t *info,
target_sigset_t *set, CPUX86State *env)
{
struct rt_sigframe *frame;
int err = 0;
frame = get_sigframe(ka, env, sizeof(*frame));
#if 0
if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
goto give_sigsegv;
#endif
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.uc_flags);
err |= __put_user(0, &frame->uc.uc_link);
err |= __put_user(/*current->sas_ss_sp*/ 0, &frame->uc.uc_stack.ss_sp);
err |= __put_user(/* sas_ss_flags(regs->esp) */ 0,
&frame->uc.uc_stack.ss_flags);
err |= __put_user(/* current->sas_ss_size */ 0, &frame->uc.uc_stack.ss_size);
err |= setup_sigcontext(&frame->uc.uc_mcontext, &frame->fpstate,
env, set->sig[0]);
err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
if (err)
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;
#define COPY(x) err |= __get_user(regs->x, &sc->x)
#define COPY_SEG(seg) \
{ unsigned short tmp; \
err |= __get_user(tmp, &sc->seg); \
regs->x##seg = tmp; }
#define COPY_SEG_STRICT(seg) \
{ unsigned short tmp; \
err |= __get_user(tmp, &sc->seg); \
regs->x##seg = tmp|3; }
#define GET_SEG(seg) \
{ unsigned short tmp; \
err |= __get_user(tmp, &sc->seg); \
loadsegment(seg,tmp); }
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 */
}
#if 0
{
struct _fpstate * buf;
err |= __get_user(buf, &sc->fpstate);
if (buf) {
if (verify_area(VERIFY_READ, buf, sizeof(*buf)))
goto badframe;
err |= restore_i387(buf);
}
}
#endif
*peax = ldl(&sc->eax);
return err;
#if 0
badframe:
return 1;
#endif
}
long do_sigreturn(CPUX86State *env)
{
struct sigframe *frame = (struct sigframe *)(env->regs[R_ESP] - 8);
target_sigset_t target_set;
sigset_t set;
int eax, i;
/* set blocked signals */
target_set.sig[0] = frame->sc.oldmask;
for(i = 1; i < TARGET_NSIG_WORDS; i++)
target_set.sig[i] = frame->extramask[i - 1];
target_to_host_sigset(&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 *)(env->regs[R_ESP] - 4);
target_sigset_t target_set;
sigset_t set;
// stack_t st;
int eax;
#if 0
if (verify_area(VERIFY_READ, frame, sizeof(*frame)))
goto badframe;
#endif
memcpy(&target_set, &frame->uc.uc_sigmask, sizeof(target_sigset_t));
target_to_host_sigset(&set, &target_set);
sigprocmask(SIG_SETMASK, &set, NULL);
if (restore_sigcontext(env, &frame->uc.uc_mcontext, &eax))
goto badframe;
#if 0
if (__copy_from_user(&st, &frame->uc.uc_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;
}
#endif
void process_pending_signals(void *cpu_env)
{
int sig;
target_ulong handler;
target_sigset_t set;
struct emulated_sigaction *k;
struct sigqueue *q;
if (!signal_pending)
return;
esig = sigact_table;
for(signum = 1; signum < TARGET_NSIG; signum++) {
if (esig->nb_pending != 0)
k = sigact_table;
for(sig = 1; sig <= TARGET_NSIG; sig++) {
if (k->pending)
goto handle_signal;
esig++;
k++;
}
/* if no signal is pending, just return */
signal_pending = 0;
return;
handle_signal:
_sa_handler = esig->sa._sa_handler;
if (_sa_handler == TARGET_SIG_DFL) {
/* default handling
#ifdef DEBUG_SIGNAL
fprintf(stderr, "gemu: process signal %d\n", sig);
#endif
/* dequeue signal */
q = k->first;
k->first = q->next;
if (!k->first)
k->pending = 0;
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 {
set = k->sa.sa_mask;
/* send the signal to the CPU */
if (k->sa.sa_flags & TARGET_SA_SIGINFO)
setup_rt_frame(sig, k, &q->info, &set, cpu_env);
else
setup_frame(sig, k, &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);
}

294
linux-user/syscall.c
View File

@ -75,12 +75,18 @@
#include "syscall-i386.h"
#endif
void host_to_target_siginfo(target_siginfo_t *tinfo, siginfo_t *info);
void target_to_host_siginfo(siginfo_t *info, target_siginfo_t *tinfo);
long do_sigreturn(CPUX86State *env);
long do_rt_sigreturn(CPUX86State *env);
#define __NR_sys_uname __NR_uname
#define __NR_sys_getcwd1 __NR_getcwd
#define __NR_sys_statfs __NR_statfs
#define __NR_sys_fstatfs __NR_fstatfs
#define __NR_sys_getdents __NR_getdents
#define __NR_sys_getdents64 __NR_getdents64
#define __NR_sys_rt_sigqueueinfo __NR_rt_sigqueueinfo
#ifdef __NR_gettid
_syscall0(int, gettid)
@ -97,6 +103,9 @@ _syscall5(int, _llseek, uint, fd, ulong, hi, ulong, lo,
loff_t *, res, uint, wh);
_syscall2(int,sys_statfs,const char *,path,struct kernel_statfs *,buf)
_syscall2(int,sys_fstatfs,int,fd,struct kernel_statfs *,buf)
_syscall3(int,sys_rt_sigqueueinfo,int,pid,int,sig,siginfo_t *,uinfo)
extern int personality(int);
static inline long get_errno(long ret)
{
@ -199,18 +208,18 @@ static inline void host_to_target_fds(target_long *target_fds,
#endif
}
/* XXX: incorrect for some archs */
static void host_to_target_old_sigset(target_ulong *old_sigset,
const sigset_t *sigset)
static inline void target_to_host_timeval(struct timeval *tv,
struct target_timeval *target_tv)
{
*old_sigset = tswap32(*(unsigned long *)sigset & 0xffffffff);
tv->tv_sec = tswapl(target_tv->tv_sec);
tv->tv_usec = tswapl(target_tv->tv_usec);
}
static void target_to_host_old_sigset(sigset_t *sigset,
const target_ulong *old_sigset)
static inline void host_to_target_timeval(struct target_timeval *target_tv,
struct timeval *tv)
{
sigemptyset(sigset);
*(unsigned long *)sigset = tswapl(*old_sigset);
target_tv->tv_sec = tswapl(tv->tv_sec);
target_tv->tv_usec = tswapl(tv->tv_usec);
}
@ -1042,28 +1051,195 @@ long do_syscall(void *cpu_env, int num, long arg1, long arg2, long arg3,
ret = get_errno(setsid());
break;
case TARGET_NR_sigaction:
#if 1
{
ret = 0;
struct target_old_sigaction *old_act = (void *)arg2;
struct target_old_sigaction *old_oact = (void *)arg3;
struct target_sigaction act, oact, *pact;
if (old_act) {
act._sa_handler = old_act->_sa_handler;
target_siginitset(&act.sa_mask, old_act->sa_mask);
act.sa_flags = old_act->sa_flags;
act.sa_restorer = old_act->sa_restorer;
pact = &act;
} else {
pact = NULL;
}
ret = get_errno(do_sigaction(arg1, pact, &oact));
if (!is_error(ret) && old_oact) {
old_oact->_sa_handler = oact._sa_handler;
old_oact->sa_mask = oact.sa_mask.sig[0];
old_oact->sa_flags = oact.sa_flags;
old_oact->sa_restorer = oact.sa_restorer;
}
}
break;
#else
goto unimplemented;
#endif
case TARGET_NR_rt_sigaction:
ret = get_errno(do_sigaction(arg1, (void *)arg2, (void *)arg3));
break;
case TARGET_NR_sgetmask:
goto unimplemented;
{
sigset_t cur_set;
target_ulong target_set;
sigprocmask(0, NULL, &cur_set);
host_to_target_old_sigset(&target_set, &cur_set);
ret = target_set;
}
break;
case TARGET_NR_ssetmask:
goto unimplemented;
{
sigset_t set, oset, cur_set;
target_ulong target_set = arg1;
sigprocmask(0, NULL, &cur_set);
target_to_host_old_sigset(&set, &target_set);
sigorset(&set, &set, &cur_set);
sigprocmask(SIG_SETMASK, &set, &oset);
host_to_target_old_sigset(&target_set, &oset);
ret = target_set;
}
break;
case TARGET_NR_sigprocmask:
{
int how = arg1;
sigset_t set, oldset, *set_ptr;
target_ulong *pset = (void *)arg2, *poldset = (void *)arg3;
if (pset) {
switch(how) {
case TARGET_SIG_BLOCK:
how = SIG_BLOCK;
break;
case TARGET_SIG_UNBLOCK:
how = SIG_UNBLOCK;
break;
case TARGET_SIG_SETMASK:
how = SIG_SETMASK;
break;
default:
ret = -EINVAL;
goto fail;
}
target_to_host_old_sigset(&set, pset);
set_ptr = &set;
} else {
how = 0;
set_ptr = NULL;
}
ret = get_errno(sigprocmask(arg1, set_ptr, &oldset));
if (!is_error(ret) && poldset) {
host_to_target_old_sigset(poldset, &oldset);
}
}
break;
case TARGET_NR_rt_sigprocmask:
{
int how = arg1;
sigset_t set, oldset, *set_ptr;
target_sigset_t *pset = (void *)arg2;
target_sigset_t *poldset = (void *)arg3;
if (pset) {
switch(how) {
case TARGET_SIG_BLOCK:
how = SIG_BLOCK;
break;
case TARGET_SIG_UNBLOCK:
how = SIG_UNBLOCK;
break;
case TARGET_SIG_SETMASK:
how = SIG_SETMASK;
break;
default:
ret = -EINVAL;
goto fail;
}
target_to_host_sigset(&set, pset);
set_ptr = &set;
} else {
how = 0;
set_ptr = NULL;
}
ret = get_errno(sigprocmask(how, set_ptr, &oldset));
if (!is_error(ret) && poldset) {
host_to_target_sigset(poldset, &oldset);
}
}
break;
case TARGET_NR_sigpending:
{
sigset_t set;
ret = get_errno(sigpending(&set));
if (!is_error(ret)) {
host_to_target_old_sigset((target_ulong *)arg1, &set);
}
}
break;
case TARGET_NR_rt_sigpending:
{
sigset_t set;
ret = get_errno(sigpending(&set));
if (!is_error(ret)) {
host_to_target_sigset((target_sigset_t *)arg1, &set);
}
}
break;
case TARGET_NR_sigsuspend:
{
sigset_t set;
target_to_host_old_sigset(&set, (target_ulong *)arg1);
ret = get_errno(sigsuspend(&set));
}
break;
case TARGET_NR_rt_sigsuspend:
{
sigset_t set;
target_to_host_sigset(&set, (target_sigset_t *)arg1);
ret = get_errno(sigsuspend(&set));
}
break;
case TARGET_NR_rt_sigtimedwait:
{
target_sigset_t *target_set = (void *)arg1;
target_siginfo_t *target_uinfo = (void *)arg2;
struct target_timespec *target_uts = (void *)arg3;
sigset_t set;
struct timespec uts, *puts;
siginfo_t uinfo;
target_to_host_sigset(&set, target_set);
if (target_uts) {
puts = &uts;
puts->tv_sec = tswapl(target_uts->tv_sec);
puts->tv_nsec = tswapl(target_uts->tv_nsec);
} else {
puts = NULL;
}
ret = get_errno(sigtimedwait(&set, &uinfo, puts));
if (!is_error(ret) && target_uinfo) {
host_to_target_siginfo(target_uinfo, &uinfo);
}
}
break;
case TARGET_NR_rt_sigqueueinfo:
{
siginfo_t uinfo;
target_to_host_siginfo(&uinfo, (target_siginfo_t *)arg3);
ret = get_errno(sys_rt_sigqueueinfo(arg1, arg2, &uinfo));
}
break;
case TARGET_NR_sigreturn:
/* NOTE: ret is eax, so not transcoding must be done */
ret = do_sigreturn(cpu_env);
break;
case TARGET_NR_rt_sigreturn:
/* NOTE: ret is eax, so not transcoding must be done */
ret = do_rt_sigreturn(cpu_env);
break;
case TARGET_NR_setreuid:
ret = get_errno(setreuid(arg1, arg2));
break;
case TARGET_NR_setregid:
ret = get_errno(setregid(arg1, arg2));
break;
case TARGET_NR_sigsuspend:
goto unimplemented;
case TARGET_NR_sigpending:
goto unimplemented;
case TARGET_NR_sethostname:
ret = get_errno(sethostname((const char *)arg1, arg2));
break;
@ -1190,9 +1366,43 @@ long do_syscall(void *cpu_env, int num, long arg1, long arg2, long arg3,
case TARGET_NR_syslog:
goto unimplemented;
case TARGET_NR_setitimer:
goto unimplemented;
{
struct target_itimerval *target_value = (void *)arg2;
struct target_itimerval *target_ovalue = (void *)arg3;
struct itimerval value, ovalue, *pvalue;
if (target_value) {
pvalue = &value;
target_to_host_timeval(&pvalue->it_interval,
&target_value->it_interval);
target_to_host_timeval(&pvalue->it_value,
&target_value->it_value);
} else {
pvalue = NULL;
}
ret = get_errno(setitimer(arg1, pvalue, &ovalue));
if (!is_error(ret) && target_ovalue) {
host_to_target_timeval(&target_ovalue->it_interval,
&ovalue.it_interval);
host_to_target_timeval(&target_ovalue->it_value,
&ovalue.it_value);
}
}
break;
case TARGET_NR_getitimer:
goto unimplemented;
{
struct target_itimerval *target_value = (void *)arg2;
struct itimerval value;
ret = get_errno(getitimer(arg1, &value));
if (!is_error(ret) && target_value) {
host_to_target_timeval(&target_value->it_interval,
&value.it_interval);
host_to_target_timeval(&target_value->it_value,
&value.it_value);
}
}
break;
case TARGET_NR_stat:
ret = get_errno(stat((const char *)arg1, &st));
goto do_stat;
@ -1279,8 +1489,6 @@ long do_syscall(void *cpu_env, int num, long arg1, long arg2, long arg3,
case TARGET_NR_fsync:
ret = get_errno(fsync(arg1));
break;
case TARGET_NR_sigreturn:
goto unimplemented;
case TARGET_NR_clone:
ret = get_errno(do_fork(cpu_env, arg1, arg2));
break;
@ -1301,39 +1509,6 @@ long do_syscall(void *cpu_env, int num, long arg1, long arg2, long arg3,
case TARGET_NR_mprotect:
ret = get_errno(mprotect((void *)arg1, arg2, arg3));
break;
case TARGET_NR_sigprocmask:
{
int how = arg1;
sigset_t set, oldset, *set_ptr;
target_ulong *pset = (void *)arg2, *poldset = (void *)arg3;
switch(how) {
case TARGET_SIG_BLOCK:
how = SIG_BLOCK;
break;
case TARGET_SIG_UNBLOCK:
how = SIG_UNBLOCK;
break;
case TARGET_SIG_SETMASK:
how = SIG_SETMASK;
break;
default:
ret = -EINVAL;
goto fail;
}
if (pset) {
target_to_host_old_sigset(&set, pset);
set_ptr = &set;
} else {
set_ptr = NULL;
}
ret = get_errno(sigprocmask(arg1, set_ptr, &oldset));
if (!is_error(ret) && poldset) {
host_to_target_old_sigset(poldset, &oldset);
}
}
break;
case TARGET_NR_create_module:
case TARGET_NR_init_module:
case TARGET_NR_delete_module:
@ -1516,13 +1691,6 @@ long do_syscall(void *cpu_env, int num, long arg1, long arg2, long arg3,
case TARGET_NR_setresgid:
case TARGET_NR_getresgid:
case TARGET_NR_prctl:
case TARGET_NR_rt_sigreturn:
case TARGET_NR_rt_sigaction:
case TARGET_NR_rt_sigprocmask:
case TARGET_NR_rt_sigpending:
case TARGET_NR_rt_sigtimedwait:
case TARGET_NR_rt_sigqueueinfo:
case TARGET_NR_rt_sigsuspend:
case TARGET_NR_pread:
case TARGET_NR_pwrite:
goto unimplemented;

37
linux-user/syscall_defs.h
View File

@ -29,6 +29,11 @@ struct target_timespec {
target_long tv_nsec;
};
struct target_itimerval {
struct target_timeval it_interval;
struct target_timeval it_value;
};
struct target_iovec {
target_long iov_base; /* Starting address */
target_long iov_len; /* Number of bytes */
@ -113,6 +118,38 @@ typedef struct {
target_ulong sig[TARGET_NSIG_WORDS];
} target_sigset_t;
#ifdef BSWAP_NEEDED
static inline void tswap_sigset(target_sigset_t *d, const target_sigset_t *s)
{
int i;
for(i = 0;i < TARGET_NSIG_WORDS; i++)
d->sig[i] = tswapl(s->sig[i]);
}
#else
static inline void tswap_sigset(target_sigset_t *d, const target_sigset_t *s)
{
*d = *s;
}
#endif
static inline void target_siginitset(target_sigset_t *d, target_ulong set)
{
int i;
d->sig[0] = set;
for(i = 1;i < TARGET_NSIG_WORDS; i++)
d->sig[i] = 0;
}
void host_to_target_sigset(target_sigset_t *d, sigset_t *s);
void target_to_host_sigset(sigset_t *d, target_sigset_t *s);
void host_to_target_old_sigset(target_ulong *old_sigset,
const sigset_t *sigset);
void target_to_host_old_sigset(sigset_t *sigset,
const target_ulong *old_sigset);
struct target_sigaction;
int do_sigaction(int sig, const struct target_sigaction *act,
struct target_sigaction *oact);
/* Networking ioctls */
#define TARGET_SIOCADDRT 0x890B /* add routing table entry */
#define TARGET_SIOCDELRT 0x890C /* delete routing table entry */

20
ops_template.h
View File

@ -1,3 +1,23 @@
/*
* i386 micro operations (included several times to generate
* different operand sizes)
*
* 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.
*/
#define DATA_BITS (1 << (3 + SHIFT))
#define SHIFT_MASK (DATA_BITS - 1)

45
syscall-i386.h
View File

@ -302,20 +302,59 @@ struct target_stat64 {
unsigned long long st_ino;
};
typedef unsigned long old_sigset_t; /* at least 32 bits */
#define TARGET_SA_NOCLDSTOP 0x00000001
#define TARGET_SA_NOCLDWAIT 0x00000002 /* not supported yet */
#define TARGET_SA_SIGINFO 0x00000004
#define TARGET_SA_ONSTACK 0x08000000
#define TARGET_SA_RESTART 0x10000000
#define TARGET_SA_NODEFER 0x40000000
#define TARGET_SA_RESETHAND 0x80000000
#define TARGET_SA_RESTORER 0x04000000
#define TARGET_SIGHUP 1
#define TARGET_SIGINT 2
#define TARGET_SIGQUIT 3
#define TARGET_SIGILL 4
#define TARGET_SIGTRAP 5
#define TARGET_SIGABRT 6
#define TARGET_SIGIOT 6
#define TARGET_SIGBUS 7
#define TARGET_SIGFPE 8
#define TARGET_SIGKILL 9
#define TARGET_SIGUSR1 10
#define TARGET_SIGSEGV 11
#define TARGET_SIGUSR2 12
#define TARGET_SIGPIPE 13
#define TARGET_SIGALRM 14
#define TARGET_SIGTERM 15
#define TARGET_SIGSTKFLT 16
#define TARGET_SIGCHLD 17
#define TARGET_SIGCONT 18
#define TARGET_SIGSTOP 19
#define TARGET_SIGTSTP 20
#define TARGET_SIGTTIN 21
#define TARGET_SIGTTOU 22
#define TARGET_SIGURG 23
#define TARGET_SIGXCPU 24
#define TARGET_SIGXFSZ 25
#define TARGET_SIGVTALRM 26
#define TARGET_SIGPROF 27
#define TARGET_SIGWINCH 28
#define TARGET_SIGIO 29
#define TARGET_SIGRTMIN 32
struct target_old_sigaction {
target_ulong _sa_handler;
target_ulong sa_mask;
target_ulong sa_flags;
void (*sa_restorer)(void);
target_ulong sa_restorer;
};
struct target_sigaction {
target_ulong _sa_handler;
target_sigset_t sa_mask;
target_ulong sa_flags;
target_ulong sa_restorer;
target_sigset_t sa_mask;
};
typedef union target_sigval {