diff options
Diffstat (limited to 'linux-user/hexagon/signal.c')
| -rw-r--r-- | linux-user/hexagon/signal.c | 288 |
1 files changed, 288 insertions, 0 deletions
diff --git a/linux-user/hexagon/signal.c b/linux-user/hexagon/signal.c new file mode 100644 index 000000000..74e61739a --- /dev/null +++ b/linux-user/hexagon/signal.c @@ -0,0 +1,288 @@ +/* + * Emulation of Linux signals + * + * Copyright (c) 2003 Fabrice Bellard + * Copyright(c) 2019-2021 Qualcomm Innovation Center, Inc. All Rights Reserved. + * + * 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, see <http://www.gnu.org/licenses/>. + */ +#include "qemu/osdep.h" +#include "qemu.h" +#include "user-internals.h" +#include "signal-common.h" +#include "linux-user/trace.h" + +struct target_sigcontext { + target_ulong r0, r1, r2, r3; + target_ulong r4, r5, r6, r7; + target_ulong r8, r9, r10, r11; + target_ulong r12, r13, r14, r15; + target_ulong r16, r17, r18, r19; + target_ulong r20, r21, r22, r23; + target_ulong r24, r25, r26, r27; + target_ulong r28, r29, r30, r31; + target_ulong sa0; + target_ulong lc0; + target_ulong sa1; + target_ulong lc1; + target_ulong m0; + target_ulong m1; + target_ulong usr; + target_ulong p3_0; + target_ulong gp; + target_ulong ugp; + target_ulong pc; + target_ulong cause; + target_ulong badva; + target_ulong pad1; + target_ulong pad2; + target_ulong pad3; +}; + +struct target_ucontext { + unsigned long uc_flags; + target_ulong uc_link; /* target pointer */ + target_stack_t uc_stack; + struct target_sigcontext uc_mcontext; + target_sigset_t uc_sigmask; +}; + +struct target_rt_sigframe { + uint32_t tramp[2]; + struct target_siginfo info; + struct target_ucontext uc; +}; + +static abi_ulong get_sigframe(struct target_sigaction *ka, + CPUHexagonState *regs, size_t framesize) +{ + abi_ulong sp = get_sp_from_cpustate(regs); + + /* This is the X/Open sanctioned signal stack switching. */ + sp = target_sigsp(sp, ka) - framesize; + + sp = QEMU_ALIGN_DOWN(sp, 8); + + return sp; +} + +static void setup_sigcontext(struct target_sigcontext *sc, CPUHexagonState *env) +{ + __put_user(env->gpr[HEX_REG_R00], &sc->r0); + __put_user(env->gpr[HEX_REG_R01], &sc->r1); + __put_user(env->gpr[HEX_REG_R02], &sc->r2); + __put_user(env->gpr[HEX_REG_R03], &sc->r3); + __put_user(env->gpr[HEX_REG_R04], &sc->r4); + __put_user(env->gpr[HEX_REG_R05], &sc->r5); + __put_user(env->gpr[HEX_REG_R06], &sc->r6); + __put_user(env->gpr[HEX_REG_R07], &sc->r7); + __put_user(env->gpr[HEX_REG_R08], &sc->r8); + __put_user(env->gpr[HEX_REG_R09], &sc->r9); + __put_user(env->gpr[HEX_REG_R10], &sc->r10); + __put_user(env->gpr[HEX_REG_R11], &sc->r11); + __put_user(env->gpr[HEX_REG_R12], &sc->r12); + __put_user(env->gpr[HEX_REG_R13], &sc->r13); + __put_user(env->gpr[HEX_REG_R14], &sc->r14); + __put_user(env->gpr[HEX_REG_R15], &sc->r15); + __put_user(env->gpr[HEX_REG_R16], &sc->r16); + __put_user(env->gpr[HEX_REG_R17], &sc->r17); + __put_user(env->gpr[HEX_REG_R18], &sc->r18); + __put_user(env->gpr[HEX_REG_R19], &sc->r19); + __put_user(env->gpr[HEX_REG_R20], &sc->r20); + __put_user(env->gpr[HEX_REG_R21], &sc->r21); + __put_user(env->gpr[HEX_REG_R22], &sc->r22); + __put_user(env->gpr[HEX_REG_R23], &sc->r23); + __put_user(env->gpr[HEX_REG_R24], &sc->r24); + __put_user(env->gpr[HEX_REG_R25], &sc->r25); + __put_user(env->gpr[HEX_REG_R26], &sc->r26); + __put_user(env->gpr[HEX_REG_R27], &sc->r27); + __put_user(env->gpr[HEX_REG_R28], &sc->r28); + __put_user(env->gpr[HEX_REG_R29], &sc->r29); + __put_user(env->gpr[HEX_REG_R30], &sc->r30); + __put_user(env->gpr[HEX_REG_R31], &sc->r31); + __put_user(env->gpr[HEX_REG_SA0], &sc->sa0); + __put_user(env->gpr[HEX_REG_LC0], &sc->lc0); + __put_user(env->gpr[HEX_REG_SA1], &sc->sa1); + __put_user(env->gpr[HEX_REG_LC1], &sc->lc1); + __put_user(env->gpr[HEX_REG_M0], &sc->m0); + __put_user(env->gpr[HEX_REG_M1], &sc->m1); + __put_user(env->gpr[HEX_REG_USR], &sc->usr); + __put_user(env->gpr[HEX_REG_P3_0], &sc->p3_0); + __put_user(env->gpr[HEX_REG_GP], &sc->gp); + __put_user(env->gpr[HEX_REG_UGP], &sc->ugp); + __put_user(env->gpr[HEX_REG_PC], &sc->pc); +} + +static void setup_ucontext(struct target_ucontext *uc, + CPUHexagonState *env, target_sigset_t *set) +{ + __put_user(0, &(uc->uc_flags)); + __put_user(0, &(uc->uc_link)); + + target_save_altstack(&uc->uc_stack, env); + + int i; + for (i = 0; i < TARGET_NSIG_WORDS; i++) { + __put_user(set->sig[i], &(uc->uc_sigmask.sig[i])); + } + + setup_sigcontext(&uc->uc_mcontext, env); +} + +static inline void install_sigtramp(uint32_t *tramp) +{ + __put_user(0x7800d166, tramp + 0); /* { r6=#__NR_rt_sigreturn } */ + __put_user(0x5400c004, tramp + 1); /* { trap0(#1) } */ +} + +void setup_rt_frame(int sig, struct target_sigaction *ka, + target_siginfo_t *info, + target_sigset_t *set, CPUHexagonState *env) +{ + abi_ulong frame_addr; + struct target_rt_sigframe *frame; + + frame_addr = get_sigframe(ka, env, sizeof(*frame)); + trace_user_setup_rt_frame(env, frame_addr); + + if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) { + goto badframe; + } + + setup_ucontext(&frame->uc, env, set); + tswap_siginfo(&frame->info, info); + /* + * The on-stack signal trampoline is no longer executed; + * however, the libgcc signal frame unwinding code checks + * for the presence of these two numeric magic values. + */ + install_sigtramp(frame->tramp); + + env->gpr[HEX_REG_PC] = ka->_sa_handler; + env->gpr[HEX_REG_SP] = frame_addr; + env->gpr[HEX_REG_R00] = sig; + env->gpr[HEX_REG_R01] = + frame_addr + offsetof(struct target_rt_sigframe, info); + env->gpr[HEX_REG_R02] = + frame_addr + offsetof(struct target_rt_sigframe, uc); + env->gpr[HEX_REG_LR] = default_rt_sigreturn; + + return; + +badframe: + unlock_user_struct(frame, frame_addr, 1); + if (sig == TARGET_SIGSEGV) { + ka->_sa_handler = TARGET_SIG_DFL; + } + force_sig(TARGET_SIGSEGV); +} + +static void restore_sigcontext(CPUHexagonState *env, + struct target_sigcontext *sc) +{ + __get_user(env->gpr[HEX_REG_R00], &sc->r0); + __get_user(env->gpr[HEX_REG_R01], &sc->r1); + __get_user(env->gpr[HEX_REG_R02], &sc->r2); + __get_user(env->gpr[HEX_REG_R03], &sc->r3); + __get_user(env->gpr[HEX_REG_R04], &sc->r4); + __get_user(env->gpr[HEX_REG_R05], &sc->r5); + __get_user(env->gpr[HEX_REG_R06], &sc->r6); + __get_user(env->gpr[HEX_REG_R07], &sc->r7); + __get_user(env->gpr[HEX_REG_R08], &sc->r8); + __get_user(env->gpr[HEX_REG_R09], &sc->r9); + __get_user(env->gpr[HEX_REG_R10], &sc->r10); + __get_user(env->gpr[HEX_REG_R11], &sc->r11); + __get_user(env->gpr[HEX_REG_R12], &sc->r12); + __get_user(env->gpr[HEX_REG_R13], &sc->r13); + __get_user(env->gpr[HEX_REG_R14], &sc->r14); + __get_user(env->gpr[HEX_REG_R15], &sc->r15); + __get_user(env->gpr[HEX_REG_R16], &sc->r16); + __get_user(env->gpr[HEX_REG_R17], &sc->r17); + __get_user(env->gpr[HEX_REG_R18], &sc->r18); + __get_user(env->gpr[HEX_REG_R19], &sc->r19); + __get_user(env->gpr[HEX_REG_R20], &sc->r20); + __get_user(env->gpr[HEX_REG_R21], &sc->r21); + __get_user(env->gpr[HEX_REG_R22], &sc->r22); + __get_user(env->gpr[HEX_REG_R23], &sc->r23); + __get_user(env->gpr[HEX_REG_R24], &sc->r24); + __get_user(env->gpr[HEX_REG_R25], &sc->r25); + __get_user(env->gpr[HEX_REG_R26], &sc->r26); + __get_user(env->gpr[HEX_REG_R27], &sc->r27); + __get_user(env->gpr[HEX_REG_R28], &sc->r28); + __get_user(env->gpr[HEX_REG_R29], &sc->r29); + __get_user(env->gpr[HEX_REG_R30], &sc->r30); + __get_user(env->gpr[HEX_REG_R31], &sc->r31); + __get_user(env->gpr[HEX_REG_SA0], &sc->sa0); + __get_user(env->gpr[HEX_REG_LC0], &sc->lc0); + __get_user(env->gpr[HEX_REG_SA1], &sc->sa1); + __get_user(env->gpr[HEX_REG_LC1], &sc->lc1); + __get_user(env->gpr[HEX_REG_M0], &sc->m0); + __get_user(env->gpr[HEX_REG_M1], &sc->m1); + __get_user(env->gpr[HEX_REG_USR], &sc->usr); + __get_user(env->gpr[HEX_REG_P3_0], &sc->p3_0); + __get_user(env->gpr[HEX_REG_GP], &sc->gp); + __get_user(env->gpr[HEX_REG_UGP], &sc->ugp); + __get_user(env->gpr[HEX_REG_PC], &sc->pc); +} + +static void restore_ucontext(CPUHexagonState *env, struct target_ucontext *uc) +{ + sigset_t blocked; + target_sigset_t target_set; + int i; + + target_sigemptyset(&target_set); + for (i = 0; i < TARGET_NSIG_WORDS; i++) { + __get_user(target_set.sig[i], &(uc->uc_sigmask.sig[i])); + } + + target_to_host_sigset_internal(&blocked, &target_set); + set_sigmask(&blocked); + + restore_sigcontext(env, &uc->uc_mcontext); +} + +long do_rt_sigreturn(CPUHexagonState *env) +{ + struct target_rt_sigframe *frame; + abi_ulong frame_addr; + + frame_addr = env->gpr[HEX_REG_SP]; + trace_user_do_sigreturn(env, frame_addr); + if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) { + goto badframe; + } + + restore_ucontext(env, &frame->uc); + target_restore_altstack(&frame->uc.uc_stack, env); + + unlock_user_struct(frame, frame_addr, 0); + return -TARGET_QEMU_ESIGRETURN; + +badframe: + unlock_user_struct(frame, frame_addr, 0); + force_sig(TARGET_SIGSEGV); + return 0; +} + +void setup_sigtramp(abi_ulong sigtramp_page) +{ + uint32_t *tramp = lock_user(VERIFY_WRITE, sigtramp_page, 4 * 2, 0); + assert(tramp != NULL); + + default_rt_sigreturn = sigtramp_page; + install_sigtramp(tramp); + + unlock_user(tramp, sigtramp_page, 4 * 2); +} |