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linux-user/sparc: Implement sparc32 rt signals 

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20210426025334.1168495-24-richard.henderson@linaro.org>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This commit is contained in:
Richard Henderson 2021-04-25 19:53:32 -07:00 committed by Laurent Vivier
parent 11670e8492
commit e76f2f847d
1 changed files with 122 additions and 4 deletions
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126
linux-user/sparc/signal.c
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@ -72,6 +72,18 @@ struct target_signal_frame {
abi_ulong rwin_save;
};
struct target_rt_signal_frame {
struct target_stackf ss;
target_siginfo_t info;
struct target_pt_regs regs;
target_sigset_t mask;
abi_ulong fpu_save;
uint32_t insns[2];
target_stack_t stack;
abi_ulong extra_size; /* Should be 0 */
abi_ulong rwin_save;
};
static abi_ulong get_sigframe(struct target_sigaction *sa,
CPUSPARCState *env,
size_t framesize)
@ -284,7 +296,59 @@ void setup_rt_frame(int sig, struct target_sigaction *ka,
target_siginfo_t *info,
target_sigset_t *set, CPUSPARCState *env)
{
qemu_log_mask(LOG_UNIMP, "setup_rt_frame: not implemented\n");
abi_ulong sf_addr;
struct target_rt_signal_frame *sf;
size_t sf_size = sizeof(*sf) + sizeof(struct target_siginfo_fpu);
sf_addr = get_sigframe(ka, env, sf_size);
trace_user_setup_rt_frame(env, sf_addr);
sf = lock_user(VERIFY_WRITE, sf_addr, sf_size, 0);
if (!sf) {
force_sigsegv(sig);
return;
}
/* 2. Save the current process state */
save_reg_win(&sf->ss.win, env);
save_pt_regs(&sf->regs, env);
save_fpu((struct target_siginfo_fpu *)(sf + 1), env);
__put_user(sf_addr + sizeof(*sf), &sf->fpu_save);
__put_user(0, &sf->rwin_save); /* TODO: save_rwin_state */
tswap_siginfo(&sf->info, info);
tswap_sigset(&sf->mask, set);
target_save_altstack(&sf->stack, env);
__put_user(0, &sf->extra_size);
/* 3. signal handler back-trampoline and parameters */
env->regwptr[WREG_SP] = sf_addr;
env->regwptr[WREG_O0] = sig;
env->regwptr[WREG_O1] =
sf_addr + offsetof(struct target_rt_signal_frame, info);
env->regwptr[WREG_O2] =
sf_addr + offsetof(struct target_rt_signal_frame, regs);
/* 4. signal handler */
env->pc = ka->_sa_handler;
env->npc = env->pc + 4;
/* 5. return to kernel instructions */
if (ka->ka_restorer) {
env->regwptr[WREG_O7] = ka->ka_restorer;
} else {
env->regwptr[WREG_O7] =
sf_addr + offsetof(struct target_rt_signal_frame, insns) - 2 * 4;
/* mov __NR_rt_sigreturn, %g1 */
__put_user(0x82102065u, &sf->insns[0]);
/* t 0x10 */
__put_user(0x91d02010u, &sf->insns[1]);
}
unlock_user(sf, sf_addr, sf_size);
}
long do_sigreturn(CPUSPARCState *env)
@ -356,9 +420,63 @@ long do_sigreturn(CPUSPARCState *env)
long do_rt_sigreturn(CPUSPARCState *env)
{
trace_user_do_rt_sigreturn(env, 0);
qemu_log_mask(LOG_UNIMP, "do_rt_sigreturn: not implemented\n");
return -TARGET_ENOSYS;
abi_ulong sf_addr, tpc, tnpc, ptr;
struct target_rt_signal_frame *sf = NULL;
sigset_t set;
sf_addr = get_sp_from_cpustate(env);
trace_user_do_rt_sigreturn(env, sf_addr);
/* 1. Make sure we are not getting garbage from the user */
if ((sf_addr & 15) || !lock_user_struct(VERIFY_READ, sf, sf_addr, 1)) {
goto segv_and_exit;
}
/* Validate SP alignment. */
__get_user(ptr, &sf->regs.u_regs[8 + WREG_SP]);
if ((ptr + TARGET_STACK_BIAS) & 7) {
goto segv_and_exit;
}
/* Validate PC and NPC alignment. */
__get_user(tpc, &sf->regs.pc);
__get_user(tnpc, &sf->regs.npc);
if ((tpc | tnpc) & 3) {
goto segv_and_exit;
}
/* 2. Restore the state */
restore_pt_regs(&sf->regs, env);
__get_user(ptr, &sf->fpu_save);
if (ptr) {
struct target_siginfo_fpu *fpu;
if ((ptr & 7) || !lock_user_struct(VERIFY_READ, fpu, ptr, 1)) {
goto segv_and_exit;
}
restore_fpu(fpu, env);
unlock_user_struct(fpu, ptr, 0);
}
__get_user(ptr, &sf->rwin_save);
if (ptr) {
goto segv_and_exit; /* TODO: restore_rwin_state */
}
target_restore_altstack(&sf->stack, env);
target_to_host_sigset(&set, &sf->mask);
set_sigmask(&set);
env->pc = tpc;
env->npc = tnpc;
unlock_user_struct(sf, sf_addr, 0);
return -TARGET_QEMU_ESIGRETURN;
segv_and_exit:
unlock_user_struct(sf, sf_addr, 0);
force_sig(TARGET_SIGSEGV);
return -TARGET_QEMU_ESIGRETURN;
}
#if defined(TARGET_SPARC64) && !defined(TARGET_ABI32)