/*
* 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 -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);
}
