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author | Richard Henderson <richard.henderson@linaro.org> | 2021-04-25 19:53:32 -0700 |
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committer | Laurent Vivier <laurent@vivier.eu> | 2021-05-15 21:43:23 +0200 |
commit | e76f2f847d6e09e948ccb74657567535c5dfa398 (patch) | |
tree | 76a2f1f2df405ca6197fcf0efd24b93c8be47c66 /linux-user/sparc | |
parent | 11670e849227890e7ab3f1413bae28bf6a0f6707 (diff) | |
download | qemu-e76f2f847d6e09e948ccb74657567535c5dfa398.zip qemu-e76f2f847d6e09e948ccb74657567535c5dfa398.tar.gz qemu-e76f2f847d6e09e948ccb74657567535c5dfa398.tar.bz2 |
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>
Diffstat (limited to 'linux-user/sparc')
-rw-r--r-- | linux-user/sparc/signal.c | 126 |
1 files changed, 122 insertions, 4 deletions
diff --git a/linux-user/sparc/signal.c b/linux-user/sparc/signal.c index 41a8b33..362993d 100644 --- a/linux-user/sparc/signal.c +++ b/linux-user/sparc/signal.c @@ -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) |