No code change, only move code from signal.c to openrisc/signal.c, except adding includes and exporting setup_rt_frame(). Signed-off-by: Laurent Vivier <laurent@vivier.eu> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20180424192635.6027-9-laurent@vivier.eu>
232 lines
7.1 KiB
C
232 lines
7.1 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 "target_signal.h"
|
|
#include "signal-common.h"
|
|
#include "linux-user/trace.h"
|
|
|
|
struct target_sigcontext {
|
|
struct target_pt_regs regs;
|
|
abi_ulong oldmask;
|
|
abi_ulong usp;
|
|
};
|
|
|
|
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; /* mask last for extensibility */
|
|
};
|
|
|
|
struct target_rt_sigframe {
|
|
abi_ulong pinfo;
|
|
uint64_t puc;
|
|
struct target_siginfo info;
|
|
struct target_sigcontext sc;
|
|
struct target_ucontext uc;
|
|
unsigned char retcode[16]; /* trampoline code */
|
|
};
|
|
|
|
/* This is the asm-generic/ucontext.h version */
|
|
#if 0
|
|
static int restore_sigcontext(CPUOpenRISCState *regs,
|
|
struct target_sigcontext *sc)
|
|
{
|
|
unsigned int err = 0;
|
|
unsigned long old_usp;
|
|
|
|
/* Alwys make any pending restarted system call return -EINTR */
|
|
current_thread_info()->restart_block.fn = do_no_restart_syscall;
|
|
|
|
/* restore the regs from &sc->regs (same as sc, since regs is first)
|
|
* (sc is already checked for VERIFY_READ since the sigframe was
|
|
* checked in sys_sigreturn previously)
|
|
*/
|
|
|
|
if (copy_from_user(regs, &sc, sizeof(struct target_pt_regs))) {
|
|
goto badframe;
|
|
}
|
|
|
|
/* make sure the U-flag is set so user-mode cannot fool us */
|
|
|
|
regs->sr &= ~SR_SM;
|
|
|
|
/* restore the old USP as it was before we stacked the sc etc.
|
|
* (we cannot just pop the sigcontext since we aligned the sp and
|
|
* stuff after pushing it)
|
|
*/
|
|
|
|
__get_user(old_usp, &sc->usp);
|
|
phx_signal("old_usp 0x%lx", old_usp);
|
|
|
|
__PHX__ REALLY /* ??? */
|
|
wrusp(old_usp);
|
|
regs->gpr[1] = old_usp;
|
|
|
|
/* TODO: the other ports use regs->orig_XX to disable syscall checks
|
|
* after this completes, but we don't use that mechanism. maybe we can
|
|
* use it now ?
|
|
*/
|
|
|
|
return err;
|
|
|
|
badframe:
|
|
return 1;
|
|
}
|
|
#endif
|
|
|
|
/* Set up a signal frame. */
|
|
|
|
static void setup_sigcontext(struct target_sigcontext *sc,
|
|
CPUOpenRISCState *regs,
|
|
unsigned long mask)
|
|
{
|
|
unsigned long usp = cpu_get_gpr(regs, 1);
|
|
|
|
/* copy the regs. they are first in sc so we can use sc directly */
|
|
|
|
/*copy_to_user(&sc, regs, sizeof(struct target_pt_regs));*/
|
|
|
|
/* Set the frametype to CRIS_FRAME_NORMAL for the execution of
|
|
the signal handler. The frametype will be restored to its previous
|
|
value in restore_sigcontext. */
|
|
/*regs->frametype = CRIS_FRAME_NORMAL;*/
|
|
|
|
/* then some other stuff */
|
|
__put_user(mask, &sc->oldmask);
|
|
__put_user(usp, &sc->usp);
|
|
}
|
|
|
|
static inline unsigned long align_sigframe(unsigned long sp)
|
|
{
|
|
return sp & ~3UL;
|
|
}
|
|
|
|
static inline abi_ulong get_sigframe(struct target_sigaction *ka,
|
|
CPUOpenRISCState *regs,
|
|
size_t frame_size)
|
|
{
|
|
unsigned long sp = cpu_get_gpr(regs, 1);
|
|
int onsigstack = on_sig_stack(sp);
|
|
|
|
/* redzone */
|
|
/* This is the X/Open sanctioned signal stack switching. */
|
|
if ((ka->sa_flags & TARGET_SA_ONSTACK) != 0 && !onsigstack) {
|
|
sp = target_sigaltstack_used.ss_sp + target_sigaltstack_used.ss_size;
|
|
}
|
|
|
|
sp = align_sigframe(sp - frame_size);
|
|
|
|
/*
|
|
* If we are on the alternate signal stack and would overflow it, don't.
|
|
* Return an always-bogus address instead so we will die with SIGSEGV.
|
|
*/
|
|
|
|
if (onsigstack && !likely(on_sig_stack(sp))) {
|
|
return -1L;
|
|
}
|
|
|
|
return sp;
|
|
}
|
|
|
|
void setup_rt_frame(int sig, struct target_sigaction *ka,
|
|
target_siginfo_t *info,
|
|
target_sigset_t *set, CPUOpenRISCState *env)
|
|
{
|
|
int err = 0;
|
|
abi_ulong frame_addr;
|
|
unsigned long return_ip;
|
|
struct target_rt_sigframe *frame;
|
|
abi_ulong info_addr, uc_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)) {
|
|
goto give_sigsegv;
|
|
}
|
|
|
|
info_addr = frame_addr + offsetof(struct target_rt_sigframe, info);
|
|
__put_user(info_addr, &frame->pinfo);
|
|
uc_addr = frame_addr + offsetof(struct target_rt_sigframe, uc);
|
|
__put_user(uc_addr, &frame->puc);
|
|
|
|
if (ka->sa_flags & SA_SIGINFO) {
|
|
tswap_siginfo(&frame->info, info);
|
|
}
|
|
|
|
/*err |= __clear_user(&frame->uc, offsetof(ucontext_t, uc_mcontext));*/
|
|
__put_user(0, &frame->uc.tuc_flags);
|
|
__put_user(0, &frame->uc.tuc_link);
|
|
__put_user(target_sigaltstack_used.ss_sp,
|
|
&frame->uc.tuc_stack.ss_sp);
|
|
__put_user(sas_ss_flags(cpu_get_gpr(env, 1)),
|
|
&frame->uc.tuc_stack.ss_flags);
|
|
__put_user(target_sigaltstack_used.ss_size,
|
|
&frame->uc.tuc_stack.ss_size);
|
|
setup_sigcontext(&frame->sc, env, set->sig[0]);
|
|
|
|
/*err |= copy_to_user(frame->uc.tuc_sigmask, set, sizeof(*set));*/
|
|
|
|
/* trampoline - the desired return ip is the retcode itself */
|
|
return_ip = (unsigned long)&frame->retcode;
|
|
/* This is l.ori r11,r0,__NR_sigreturn, l.sys 1 */
|
|
__put_user(0xa960, (short *)(frame->retcode + 0));
|
|
__put_user(TARGET_NR_rt_sigreturn, (short *)(frame->retcode + 2));
|
|
__put_user(0x20000001, (unsigned long *)(frame->retcode + 4));
|
|
__put_user(0x15000000, (unsigned long *)(frame->retcode + 8));
|
|
|
|
if (err) {
|
|
goto give_sigsegv;
|
|
}
|
|
|
|
/* TODO what is the current->exec_domain stuff and invmap ? */
|
|
|
|
/* Set up registers for signal handler */
|
|
env->pc = (unsigned long)ka->_sa_handler; /* what we enter NOW */
|
|
cpu_set_gpr(env, 9, (unsigned long)return_ip); /* what we enter LATER */
|
|
cpu_set_gpr(env, 3, (unsigned long)sig); /* arg 1: signo */
|
|
cpu_set_gpr(env, 4, (unsigned long)&frame->info); /* arg 2: (siginfo_t*) */
|
|
cpu_set_gpr(env, 5, (unsigned long)&frame->uc); /* arg 3: ucontext */
|
|
|
|
/* actually move the usp to reflect the stacked frame */
|
|
cpu_set_gpr(env, 1, (unsigned long)frame);
|
|
|
|
return;
|
|
|
|
give_sigsegv:
|
|
unlock_user_struct(frame, frame_addr, 1);
|
|
force_sigsegv(sig);
|
|
}
|
|
|
|
long do_sigreturn(CPUOpenRISCState *env)
|
|
{
|
|
trace_user_do_sigreturn(env, 0);
|
|
fprintf(stderr, "do_sigreturn: not implemented\n");
|
|
return -TARGET_ENOSYS;
|
|
}
|
|
|
|
long do_rt_sigreturn(CPUOpenRISCState *env)
|
|
{
|
|
trace_user_do_rt_sigreturn(env, 0);
|
|
fprintf(stderr, "do_rt_sigreturn: not implemented\n");
|
|
return -TARGET_ENOSYS;
|
|
}
|