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/*
* Emulation of Linux signals
*
* Copyright (c) 2003 Fabrice Bellard
*
* 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 {
struct target_pt_regs regs; /* needs to be first */
uint32_t oldmask;
};
struct target_stack_t {
abi_ulong ss_sp;
int ss_flags;
unsigned int ss_size;
};
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;
};
/* Signal frames. */
struct target_rt_sigframe {
target_siginfo_t info;
struct target_ucontext uc;
uint32_t tramp[2];
};
static void setup_sigcontext(struct target_sigcontext *sc, CPUMBState *env)
{
__put_user(env->regs[0], &sc->regs.r0);
__put_user(env->regs[1], &sc->regs.r1);
__put_user(env->regs[2], &sc->regs.r2);
__put_user(env->regs[3], &sc->regs.r3);
__put_user(env->regs[4], &sc->regs.r4);
__put_user(env->regs[5], &sc->regs.r5);
__put_user(env->regs[6], &sc->regs.r6);
__put_user(env->regs[7], &sc->regs.r7);
__put_user(env->regs[8], &sc->regs.r8);
__put_user(env->regs[9], &sc->regs.r9);
__put_user(env->regs[10], &sc->regs.r10);
__put_user(env->regs[11], &sc->regs.r11);
__put_user(env->regs[12], &sc->regs.r12);
__put_user(env->regs[13], &sc->regs.r13);
__put_user(env->regs[14], &sc->regs.r14);
__put_user(env->regs[15], &sc->regs.r15);
__put_user(env->regs[16], &sc->regs.r16);
__put_user(env->regs[17], &sc->regs.r17);
__put_user(env->regs[18], &sc->regs.r18);
__put_user(env->regs[19], &sc->regs.r19);
__put_user(env->regs[20], &sc->regs.r20);
__put_user(env->regs[21], &sc->regs.r21);
__put_user(env->regs[22], &sc->regs.r22);
__put_user(env->regs[23], &sc->regs.r23);
__put_user(env->regs[24], &sc->regs.r24);
__put_user(env->regs[25], &sc->regs.r25);
__put_user(env->regs[26], &sc->regs.r26);
__put_user(env->regs[27], &sc->regs.r27);
__put_user(env->regs[28], &sc->regs.r28);
__put_user(env->regs[29], &sc->regs.r29);
__put_user(env->regs[30], &sc->regs.r30);
__put_user(env->regs[31], &sc->regs.r31);
__put_user(env->pc, &sc->regs.pc);
}
static void restore_sigcontext(struct target_sigcontext *sc, CPUMBState *env)
{
__get_user(env->regs[0], &sc->regs.r0);
__get_user(env->regs[1], &sc->regs.r1);
__get_user(env->regs[2], &sc->regs.r2);
__get_user(env->regs[3], &sc->regs.r3);
__get_user(env->regs[4], &sc->regs.r4);
__get_user(env->regs[5], &sc->regs.r5);
__get_user(env->regs[6], &sc->regs.r6);
__get_user(env->regs[7], &sc->regs.r7);
__get_user(env->regs[8], &sc->regs.r8);
__get_user(env->regs[9], &sc->regs.r9);
__get_user(env->regs[10], &sc->regs.r10);
__get_user(env->regs[11], &sc->regs.r11);
__get_user(env->regs[12], &sc->regs.r12);
__get_user(env->regs[13], &sc->regs.r13);
__get_user(env->regs[14], &sc->regs.r14);
__get_user(env->regs[15], &sc->regs.r15);
__get_user(env->regs[16], &sc->regs.r16);
__get_user(env->regs[17], &sc->regs.r17);
__get_user(env->regs[18], &sc->regs.r18);
__get_user(env->regs[19], &sc->regs.r19);
__get_user(env->regs[20], &sc->regs.r20);
__get_user(env->regs[21], &sc->regs.r21);
__get_user(env->regs[22], &sc->regs.r22);
__get_user(env->regs[23], &sc->regs.r23);
__get_user(env->regs[24], &sc->regs.r24);
__get_user(env->regs[25], &sc->regs.r25);
__get_user(env->regs[26], &sc->regs.r26);
__get_user(env->regs[27], &sc->regs.r27);
__get_user(env->regs[28], &sc->regs.r28);
__get_user(env->regs[29], &sc->regs.r29);
__get_user(env->regs[30], &sc->regs.r30);
__get_user(env->regs[31], &sc->regs.r31);
__get_user(env->pc, &sc->regs.pc);
}
static abi_ulong get_sigframe(struct target_sigaction *ka,
CPUMBState *env, int frame_size)
{
abi_ulong sp = env->regs[1];
sp = target_sigsp(sp, ka);
return ((sp - frame_size) & -8UL);
}
void setup_rt_frame(int sig, struct target_sigaction *ka,
target_siginfo_t *info,
target_sigset_t *set, CPUMBState *env)
{
struct target_rt_sigframe *frame;
abi_ulong frame_addr;
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)) {
force_sigsegv(sig);
return;
}
tswap_siginfo(&frame->info, info);
__put_user(0, &frame->uc.tuc_flags);
__put_user(0, &frame->uc.tuc_link);
target_save_altstack(&frame->uc.tuc_stack, env);
setup_sigcontext(&frame->uc.tuc_mcontext, env);
for (int i = 0; i < TARGET_NSIG_WORDS; i++) {
__put_user(set->sig[i], &frame->uc.tuc_sigmask.sig[i]);
}
/* Kernel does not use SA_RESTORER. */
/*
* Return from sighandler will jump to the tramp.
* Negative 8 offset because return is rtsd r15, 8
*/
env->regs[15] = default_rt_sigreturn - 8;
/* Set up registers for signal handler */
env->regs[1] = frame_addr;
/* Signal handler args: */
env->regs[5] = sig;
env->regs[6] = frame_addr + offsetof(struct target_rt_sigframe, info);
env->regs[7] = frame_addr + offsetof(struct target_rt_sigframe, uc);
/* Offset to handle microblaze rtid r14, 0 */
env->pc = (unsigned long)ka->_sa_handler;
unlock_user_struct(frame, frame_addr, 1);
}
long do_sigreturn(CPUMBState *env)
{
return -TARGET_ENOSYS;
}
long do_rt_sigreturn(CPUMBState *env)
{
struct target_rt_sigframe *frame = NULL;
abi_ulong frame_addr = env->regs[1];
sigset_t set;
trace_user_do_rt_sigreturn(env, frame_addr);
if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) {
goto badframe;
}
target_to_host_sigset(&set, &frame->uc.tuc_sigmask);
set_sigmask(&set);
restore_sigcontext(&frame->uc.tuc_mcontext, env);
target_restore_altstack(&frame->uc.tuc_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 -QEMU_ESIGRETURN;
}
void setup_sigtramp(abi_ulong sigtramp_page)
{
uint32_t *tramp = lock_user(VERIFY_WRITE, sigtramp_page, 8, 0);
assert(tramp != NULL);
/*
* addi r12, r0, __NR_rt_sigreturn
* brki r14, 0x8
*/
__put_user(0x31800000U | TARGET_NR_rt_sigreturn, tramp);
__put_user(0xb9cc0008U, tramp + 1);
default_rt_sigreturn = sigtramp_page;
unlock_user(tramp, sigtramp_page, 8);
}
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