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linux-user/tilegx: Implement tilegx signal features

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[rth: Remove the spreg[EX1] handling, as it's irrelevant to user-mode.]

Signed-off-by: Chen Gang <gang.chen.5i5j@gmail.com>
Message-Id: <1443312618-13641-1-git-send-email-gang.chen.5i5j@gmail.com>
Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Chen Gang 2015-09-27 08:10:18 +08:00 committed by Richard Henderson
parent de2fdd56b1
commit bf0f60a61b
2 changed files with 161 additions and 1 deletions
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159
linux-user/signal.c
View File

@ -5537,6 +5537,163 @@ long do_rt_sigreturn(CPUAlphaState *env)
force_sig(TARGET_SIGSEGV);
}
#elif defined(TARGET_TILEGX)
struct target_sigcontext {
union {
/* General-purpose registers. */
abi_ulong gregs[56];
struct {
abi_ulong __gregs[53];
abi_ulong tp; /* Aliases gregs[TREG_TP]. */
abi_ulong sp; /* Aliases gregs[TREG_SP]. */
abi_ulong lr; /* Aliases gregs[TREG_LR]. */
};
};
abi_ulong pc; /* Program counter. */
abi_ulong ics; /* In Interrupt Critical Section? */
abi_ulong faultnum; /* Fault number. */
abi_ulong pad[5];
};
struct target_ucontext {
abi_ulong tuc_flags;
abi_ulong tuc_link;
target_stack_t tuc_stack;
struct target_sigcontext tuc_mcontext;
target_sigset_t tuc_sigmask; /* mask last for extensibility */
};
struct target_rt_sigframe {
unsigned char save_area[16]; /* caller save area */
struct target_siginfo info;
struct target_ucontext uc;
};
static void setup_sigcontext(struct target_sigcontext *sc,
CPUArchState *env, int signo)
{
int i;
for (i = 0; i < TILEGX_R_COUNT; ++i) {
__put_user(env->regs[i], &sc->gregs[i]);
}
__put_user(env->pc, &sc->pc);
__put_user(0, &sc->ics);
__put_user(signo, &sc->faultnum);
}
static void restore_sigcontext(CPUTLGState *env, struct target_sigcontext *sc)
{
int i;
for (i = 0; i < TILEGX_R_COUNT; ++i) {
__get_user(env->regs[i], &sc->gregs[i]);
}
__get_user(env->pc, &sc->pc);
}
static abi_ulong get_sigframe(struct target_sigaction *ka, CPUArchState *env,
size_t frame_size)
{
unsigned long sp = env->regs[TILEGX_R_SP];
if (on_sig_stack(sp) && !likely(on_sig_stack(sp - frame_size))) {
return -1UL;
}
if ((ka->sa_flags & SA_ONSTACK) && !sas_ss_flags(sp)) {
sp = target_sigaltstack_used.ss_sp + target_sigaltstack_used.ss_size;
}
sp -= frame_size;
sp &= -16UL;
return sp;
}
static void setup_rt_frame(int sig, struct target_sigaction *ka,
target_siginfo_t *info,
target_sigset_t *set, CPUArchState *env)
{
abi_ulong frame_addr;
struct target_rt_sigframe *frame;
unsigned long restorer;
frame_addr = get_sigframe(ka, env, sizeof(*frame));
if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) {
goto give_sigsegv;
}
/* Always write at least the signal number for the stack backtracer. */
if (ka->sa_flags & TARGET_SA_SIGINFO) {
/* At sigreturn time, restore the callee-save registers too. */
tswap_siginfo(&frame->info, info);
/* regs->flags |= PT_FLAGS_RESTORE_REGS; FIXME: we can skip it? */
} else {
__put_user(info->si_signo, &frame->info.si_signo);
}
/* Create the ucontext. */
__put_user(0, &frame->uc.tuc_flags);
__put_user(0, &frame->uc.tuc_link);
__put_user(target_sigaltstack_used.ss_sp, &frame->uc.tuc_stack.ss_sp);
__put_user(sas_ss_flags(env->regs[TILEGX_R_SP]),
&frame->uc.tuc_stack.ss_flags);
__put_user(target_sigaltstack_used.ss_size, &frame->uc.tuc_stack.ss_size);
setup_sigcontext(&frame->uc.tuc_mcontext, env, info->si_signo);
restorer = (unsigned long) do_rt_sigreturn;
if (ka->sa_flags & TARGET_SA_RESTORER) {
restorer = (unsigned long) ka->sa_restorer;
}
env->pc = (unsigned long) ka->_sa_handler;
env->regs[TILEGX_R_SP] = (unsigned long) frame;
env->regs[TILEGX_R_LR] = restorer;
env->regs[0] = (unsigned long) sig;
env->regs[1] = (unsigned long) &frame->info;
env->regs[2] = (unsigned long) &frame->uc;
/* regs->flags |= PT_FLAGS_CALLER_SAVES; FIXME: we can skip it? */
unlock_user_struct(frame, frame_addr, 1);
return;
give_sigsegv:
if (sig == TARGET_SIGSEGV) {
ka->_sa_handler = TARGET_SIG_DFL;
}
force_sig(TARGET_SIGSEGV /* , current */);
}
long do_rt_sigreturn(CPUTLGState *env)
{
abi_ulong frame_addr = env->regs[TILEGX_R_SP];
struct target_rt_sigframe *frame;
sigset_t set;
if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) {
goto badframe;
}
target_to_host_sigset(&set, &frame->uc.tuc_sigmask);
do_sigprocmask(SIG_SETMASK, &set, NULL);
restore_sigcontext(env, &frame->uc.tuc_mcontext);
if (do_sigaltstack(frame_addr + offsetof(struct target_rt_sigframe,
uc.tuc_stack),
0, env->regs[TILEGX_R_SP]) == -EFAULT) {
goto badframe;
}
unlock_user_struct(frame, frame_addr, 0);
return env->regs[TILEGX_R_RE];
badframe:
unlock_user_struct(frame, frame_addr, 0);
force_sig(TARGET_SIGSEGV);
}
#else
static void setup_frame(int sig, struct target_sigaction *ka,
@ -5657,7 +5814,7 @@ void process_pending_signals(CPUArchState *cpu_env)
#endif
/* prepare the stack frame of the virtual CPU */
#if defined(TARGET_ABI_MIPSN32) || defined(TARGET_ABI_MIPSN64) \
|| defined(TARGET_OPENRISC)
|| defined(TARGET_OPENRISC) || defined(TARGET_TILEGX)
/* These targets do not have traditional signals. */
setup_rt_frame(sig, sa, &q->info, &target_old_set, cpu_env);
#else

3
linux-user/tilegx/syscall.h
View File

@ -37,4 +37,7 @@ struct target_pt_regs {
#define TARGET_MLOCKALL_MCL_CURRENT 1
#define TARGET_MLOCKALL_MCL_FUTURE 2
/* For faultnum */
#define TARGET_INT_SWINT_1 14
#endif