mirror of
https://github.com/xemu-project/xemu.git
synced 2024-12-24 12:55:20 +00:00
ddc3e74d9c
In most cases we were already passing get_sp_from_cpustate directly to the function. In other cases, we were passing a local variable which already contained the same value. In the rest of the cases, we were passing the stack pointer out of env directly. Reviewed by: Warner Losh <imp@bsdimp.com> Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20210426025334.1168495-5-richard.henderson@linaro.org> Signed-off-by: Laurent Vivier <laurent@vivier.eu>
336 lines
10 KiB
C
336 lines
10 KiB
C
/*
|
|
* 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 "signal-common.h"
|
|
#include "linux-user/trace.h"
|
|
|
|
/*
|
|
* code and data structures from linux kernel:
|
|
* include/asm-sh/sigcontext.h
|
|
* arch/sh/kernel/signal.c
|
|
*/
|
|
|
|
struct target_sigcontext {
|
|
target_ulong oldmask;
|
|
|
|
/* CPU registers */
|
|
target_ulong sc_gregs[16];
|
|
target_ulong sc_pc;
|
|
target_ulong sc_pr;
|
|
target_ulong sc_sr;
|
|
target_ulong sc_gbr;
|
|
target_ulong sc_mach;
|
|
target_ulong sc_macl;
|
|
|
|
/* FPU registers */
|
|
target_ulong sc_fpregs[16];
|
|
target_ulong sc_xfpregs[16];
|
|
unsigned int sc_fpscr;
|
|
unsigned int sc_fpul;
|
|
unsigned int sc_ownedfp;
|
|
};
|
|
|
|
struct target_sigframe
|
|
{
|
|
struct target_sigcontext sc;
|
|
target_ulong extramask[TARGET_NSIG_WORDS-1];
|
|
uint16_t retcode[3];
|
|
};
|
|
|
|
|
|
struct target_ucontext {
|
|
target_ulong tuc_flags;
|
|
struct target_ucontext *tuc_link;
|
|
target_stack_t tuc_stack;
|
|
struct target_sigcontext tuc_mcontext;
|
|
target_sigset_t tuc_sigmask; /* mask last for extensibility */
|
|
};
|
|
|
|
struct target_rt_sigframe
|
|
{
|
|
struct target_siginfo info;
|
|
struct target_ucontext uc;
|
|
uint16_t retcode[3];
|
|
};
|
|
|
|
|
|
#define MOVW(n) (0x9300|((n)-2)) /* Move mem word at PC+n to R3 */
|
|
#define TRAP_NOARG 0xc310 /* Syscall w/no args (NR in R3) SH3/4 */
|
|
|
|
static abi_ulong get_sigframe(struct target_sigaction *ka,
|
|
unsigned long sp, size_t frame_size)
|
|
{
|
|
sp = target_sigsp(sp, ka);
|
|
|
|
return (sp - frame_size) & -8ul;
|
|
}
|
|
|
|
/*
|
|
* Notice when we're in the middle of a gUSA region and reset.
|
|
* Note that this will only occur when #CF_PARALLEL is unset, as we
|
|
* will translate such sequences differently in a parallel context.
|
|
*/
|
|
static void unwind_gusa(CPUSH4State *regs)
|
|
{
|
|
/* If the stack pointer is sufficiently negative, and we haven't
|
|
completed the sequence, then reset to the entry to the region. */
|
|
/* ??? The SH4 kernel checks for and address above 0xC0000000.
|
|
However, the page mappings in qemu linux-user aren't as restricted
|
|
and we wind up with the normal stack mapped above 0xF0000000.
|
|
That said, there is no reason why the kernel should be allowing
|
|
a gUSA region that spans 1GB. Use a tighter check here, for what
|
|
can actually be enabled by the immediate move. */
|
|
if (regs->gregs[15] >= -128u && regs->pc < regs->gregs[0]) {
|
|
/* Reset the PC to before the gUSA region, as computed from
|
|
R0 = region end, SP = -(region size), plus one more for the
|
|
insn that actually initializes SP to the region size. */
|
|
regs->pc = regs->gregs[0] + regs->gregs[15] - 2;
|
|
|
|
/* Reset the SP to the saved version in R1. */
|
|
regs->gregs[15] = regs->gregs[1];
|
|
}
|
|
}
|
|
|
|
static void setup_sigcontext(struct target_sigcontext *sc,
|
|
CPUSH4State *regs, unsigned long mask)
|
|
{
|
|
int i;
|
|
|
|
#define COPY(x) __put_user(regs->x, &sc->sc_##x)
|
|
COPY(gregs[0]); COPY(gregs[1]);
|
|
COPY(gregs[2]); COPY(gregs[3]);
|
|
COPY(gregs[4]); COPY(gregs[5]);
|
|
COPY(gregs[6]); COPY(gregs[7]);
|
|
COPY(gregs[8]); COPY(gregs[9]);
|
|
COPY(gregs[10]); COPY(gregs[11]);
|
|
COPY(gregs[12]); COPY(gregs[13]);
|
|
COPY(gregs[14]); COPY(gregs[15]);
|
|
COPY(gbr); COPY(mach);
|
|
COPY(macl); COPY(pr);
|
|
COPY(sr); COPY(pc);
|
|
#undef COPY
|
|
|
|
for (i=0; i<16; i++) {
|
|
__put_user(regs->fregs[i], &sc->sc_fpregs[i]);
|
|
}
|
|
__put_user(regs->fpscr, &sc->sc_fpscr);
|
|
__put_user(regs->fpul, &sc->sc_fpul);
|
|
|
|
/* non-iBCS2 extensions.. */
|
|
__put_user(mask, &sc->oldmask);
|
|
}
|
|
|
|
static void restore_sigcontext(CPUSH4State *regs, struct target_sigcontext *sc)
|
|
{
|
|
int i;
|
|
|
|
#define COPY(x) __get_user(regs->x, &sc->sc_##x)
|
|
COPY(gregs[0]); COPY(gregs[1]);
|
|
COPY(gregs[2]); COPY(gregs[3]);
|
|
COPY(gregs[4]); COPY(gregs[5]);
|
|
COPY(gregs[6]); COPY(gregs[7]);
|
|
COPY(gregs[8]); COPY(gregs[9]);
|
|
COPY(gregs[10]); COPY(gregs[11]);
|
|
COPY(gregs[12]); COPY(gregs[13]);
|
|
COPY(gregs[14]); COPY(gregs[15]);
|
|
COPY(gbr); COPY(mach);
|
|
COPY(macl); COPY(pr);
|
|
COPY(sr); COPY(pc);
|
|
#undef COPY
|
|
|
|
for (i=0; i<16; i++) {
|
|
__get_user(regs->fregs[i], &sc->sc_fpregs[i]);
|
|
}
|
|
__get_user(regs->fpscr, &sc->sc_fpscr);
|
|
__get_user(regs->fpul, &sc->sc_fpul);
|
|
|
|
regs->tra = -1; /* disable syscall checks */
|
|
regs->flags &= ~(DELAY_SLOT_MASK | GUSA_MASK);
|
|
}
|
|
|
|
void setup_frame(int sig, struct target_sigaction *ka,
|
|
target_sigset_t *set, CPUSH4State *regs)
|
|
{
|
|
struct target_sigframe *frame;
|
|
abi_ulong frame_addr;
|
|
int i;
|
|
|
|
unwind_gusa(regs);
|
|
|
|
frame_addr = get_sigframe(ka, regs->gregs[15], sizeof(*frame));
|
|
trace_user_setup_frame(regs, frame_addr);
|
|
if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) {
|
|
goto give_sigsegv;
|
|
}
|
|
|
|
setup_sigcontext(&frame->sc, regs, set->sig[0]);
|
|
|
|
for (i = 0; i < TARGET_NSIG_WORDS - 1; i++) {
|
|
__put_user(set->sig[i + 1], &frame->extramask[i]);
|
|
}
|
|
|
|
/* Set up to return from userspace. If provided, use a stub
|
|
already in userspace. */
|
|
if (ka->sa_flags & TARGET_SA_RESTORER) {
|
|
regs->pr = (unsigned long) ka->sa_restorer;
|
|
} else {
|
|
/* Generate return code (system call to sigreturn) */
|
|
abi_ulong retcode_addr = frame_addr +
|
|
offsetof(struct target_sigframe, retcode);
|
|
__put_user(MOVW(2), &frame->retcode[0]);
|
|
__put_user(TRAP_NOARG, &frame->retcode[1]);
|
|
__put_user((TARGET_NR_sigreturn), &frame->retcode[2]);
|
|
regs->pr = (unsigned long) retcode_addr;
|
|
}
|
|
|
|
/* Set up registers for signal handler */
|
|
regs->gregs[15] = frame_addr;
|
|
regs->gregs[4] = sig; /* Arg for signal handler */
|
|
regs->gregs[5] = 0;
|
|
regs->gregs[6] = frame_addr += offsetof(typeof(*frame), sc);
|
|
regs->pc = (unsigned long) ka->_sa_handler;
|
|
regs->flags &= ~(DELAY_SLOT_MASK | GUSA_MASK);
|
|
|
|
unlock_user_struct(frame, frame_addr, 1);
|
|
return;
|
|
|
|
give_sigsegv:
|
|
unlock_user_struct(frame, frame_addr, 1);
|
|
force_sigsegv(sig);
|
|
}
|
|
|
|
void setup_rt_frame(int sig, struct target_sigaction *ka,
|
|
target_siginfo_t *info,
|
|
target_sigset_t *set, CPUSH4State *regs)
|
|
{
|
|
struct target_rt_sigframe *frame;
|
|
abi_ulong frame_addr;
|
|
int i;
|
|
|
|
unwind_gusa(regs);
|
|
|
|
frame_addr = get_sigframe(ka, regs->gregs[15], sizeof(*frame));
|
|
trace_user_setup_rt_frame(regs, frame_addr);
|
|
if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) {
|
|
goto give_sigsegv;
|
|
}
|
|
|
|
tswap_siginfo(&frame->info, info);
|
|
|
|
/* Create the ucontext. */
|
|
__put_user(0, &frame->uc.tuc_flags);
|
|
__put_user(0, (unsigned long *)&frame->uc.tuc_link);
|
|
target_save_altstack(&frame->uc.tuc_stack, regs);
|
|
setup_sigcontext(&frame->uc.tuc_mcontext,
|
|
regs, set->sig[0]);
|
|
for(i = 0; i < TARGET_NSIG_WORDS; i++) {
|
|
__put_user(set->sig[i], &frame->uc.tuc_sigmask.sig[i]);
|
|
}
|
|
|
|
/* Set up to return from userspace. If provided, use a stub
|
|
already in userspace. */
|
|
if (ka->sa_flags & TARGET_SA_RESTORER) {
|
|
regs->pr = (unsigned long) ka->sa_restorer;
|
|
} else {
|
|
/* Generate return code (system call to sigreturn) */
|
|
abi_ulong retcode_addr = frame_addr +
|
|
offsetof(struct target_rt_sigframe, retcode);
|
|
__put_user(MOVW(2), &frame->retcode[0]);
|
|
__put_user(TRAP_NOARG, &frame->retcode[1]);
|
|
__put_user((TARGET_NR_rt_sigreturn), &frame->retcode[2]);
|
|
regs->pr = (unsigned long) retcode_addr;
|
|
}
|
|
|
|
/* Set up registers for signal handler */
|
|
regs->gregs[15] = frame_addr;
|
|
regs->gregs[4] = sig; /* Arg for signal handler */
|
|
regs->gregs[5] = frame_addr + offsetof(typeof(*frame), info);
|
|
regs->gregs[6] = frame_addr + offsetof(typeof(*frame), uc);
|
|
regs->pc = (unsigned long) ka->_sa_handler;
|
|
regs->flags &= ~(DELAY_SLOT_MASK | GUSA_MASK);
|
|
|
|
unlock_user_struct(frame, frame_addr, 1);
|
|
return;
|
|
|
|
give_sigsegv:
|
|
unlock_user_struct(frame, frame_addr, 1);
|
|
force_sigsegv(sig);
|
|
}
|
|
|
|
long do_sigreturn(CPUSH4State *regs)
|
|
{
|
|
struct target_sigframe *frame;
|
|
abi_ulong frame_addr;
|
|
sigset_t blocked;
|
|
target_sigset_t target_set;
|
|
int i;
|
|
|
|
frame_addr = regs->gregs[15];
|
|
trace_user_do_sigreturn(regs, frame_addr);
|
|
if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) {
|
|
goto badframe;
|
|
}
|
|
|
|
__get_user(target_set.sig[0], &frame->sc.oldmask);
|
|
for(i = 1; i < TARGET_NSIG_WORDS; i++) {
|
|
__get_user(target_set.sig[i], &frame->extramask[i - 1]);
|
|
}
|
|
|
|
target_to_host_sigset_internal(&blocked, &target_set);
|
|
set_sigmask(&blocked);
|
|
|
|
restore_sigcontext(regs, &frame->sc);
|
|
|
|
unlock_user_struct(frame, frame_addr, 0);
|
|
return -TARGET_QEMU_ESIGRETURN;
|
|
|
|
badframe:
|
|
unlock_user_struct(frame, frame_addr, 0);
|
|
force_sig(TARGET_SIGSEGV);
|
|
return -TARGET_QEMU_ESIGRETURN;
|
|
}
|
|
|
|
long do_rt_sigreturn(CPUSH4State *regs)
|
|
{
|
|
struct target_rt_sigframe *frame;
|
|
abi_ulong frame_addr;
|
|
sigset_t blocked;
|
|
|
|
frame_addr = regs->gregs[15];
|
|
trace_user_do_rt_sigreturn(regs, frame_addr);
|
|
if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) {
|
|
goto badframe;
|
|
}
|
|
|
|
target_to_host_sigset(&blocked, &frame->uc.tuc_sigmask);
|
|
set_sigmask(&blocked);
|
|
|
|
restore_sigcontext(regs, &frame->uc.tuc_mcontext);
|
|
target_restore_altstack(&frame->uc.tuc_stack, regs);
|
|
|
|
unlock_user_struct(frame, frame_addr, 0);
|
|
return -TARGET_QEMU_ESIGRETURN;
|
|
|
|
badframe:
|
|
unlock_user_struct(frame, frame_addr, 0);
|
|
force_sig(TARGET_SIGSEGV);
|
|
return -TARGET_QEMU_ESIGRETURN;
|
|
}
|