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-rw-r--r--linux-user/nios2/signal.c236
-rw-r--r--linux-user/nios2/target_signal.h4
2 files changed, 240 insertions, 0 deletions
diff --git a/linux-user/nios2/signal.c b/linux-user/nios2/signal.c
index 02ca338b6c..816eed90f1 100644
--- a/linux-user/nios2/signal.c
+++ b/linux-user/nios2/signal.c
@@ -16,3 +16,239 @@
* 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"
+
+#define MCONTEXT_VERSION 2
+
+struct target_sigcontext {
+ int version;
+ unsigned long gregs[32];
+};
+
+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 {
+ struct target_siginfo info;
+ struct target_ucontext uc;
+};
+
+static unsigned long sigsp(unsigned long sp, struct target_sigaction *ka)
+{
+ if (unlikely((ka->sa_flags & SA_ONSTACK)) && !sas_ss_flags(sp)) {
+#ifdef CONFIG_STACK_GROWSUP
+ return target_sigaltstack_used.ss_sp;
+#else
+ return target_sigaltstack_used.ss_sp + target_sigaltstack_used.ss_size;
+#endif
+ }
+ return sp;
+}
+
+static int rt_setup_ucontext(struct target_ucontext *uc, CPUNios2State *env)
+{
+ unsigned long *gregs = uc->tuc_mcontext.gregs;
+
+ __put_user(MCONTEXT_VERSION, &uc->tuc_mcontext.version);
+ __put_user(env->regs[1], &gregs[0]);
+ __put_user(env->regs[2], &gregs[1]);
+ __put_user(env->regs[3], &gregs[2]);
+ __put_user(env->regs[4], &gregs[3]);
+ __put_user(env->regs[5], &gregs[4]);
+ __put_user(env->regs[6], &gregs[5]);
+ __put_user(env->regs[7], &gregs[6]);
+ __put_user(env->regs[8], &gregs[7]);
+ __put_user(env->regs[9], &gregs[8]);
+ __put_user(env->regs[10], &gregs[9]);
+ __put_user(env->regs[11], &gregs[10]);
+ __put_user(env->regs[12], &gregs[11]);
+ __put_user(env->regs[13], &gregs[12]);
+ __put_user(env->regs[14], &gregs[13]);
+ __put_user(env->regs[15], &gregs[14]);
+ __put_user(env->regs[16], &gregs[15]);
+ __put_user(env->regs[17], &gregs[16]);
+ __put_user(env->regs[18], &gregs[17]);
+ __put_user(env->regs[19], &gregs[18]);
+ __put_user(env->regs[20], &gregs[19]);
+ __put_user(env->regs[21], &gregs[20]);
+ __put_user(env->regs[22], &gregs[21]);
+ __put_user(env->regs[23], &gregs[22]);
+ __put_user(env->regs[R_RA], &gregs[23]);
+ __put_user(env->regs[R_FP], &gregs[24]);
+ __put_user(env->regs[R_GP], &gregs[25]);
+ __put_user(env->regs[R_EA], &gregs[27]);
+ __put_user(env->regs[R_SP], &gregs[28]);
+
+ return 0;
+}
+
+static int rt_restore_ucontext(CPUNios2State *env, struct target_ucontext *uc,
+ int *pr2)
+{
+ int temp;
+ abi_ulong off, frame_addr = env->regs[R_SP];
+ unsigned long *gregs = uc->tuc_mcontext.gregs;
+ int err;
+
+ /* Always make any pending restarted system calls return -EINTR */
+ /* current->restart_block.fn = do_no_restart_syscall; */
+
+ __get_user(temp, &uc->tuc_mcontext.version);
+ if (temp != MCONTEXT_VERSION) {
+ return 1;
+ }
+
+ /* restore passed registers */
+ __get_user(env->regs[1], &gregs[0]);
+ __get_user(env->regs[2], &gregs[1]);
+ __get_user(env->regs[3], &gregs[2]);
+ __get_user(env->regs[4], &gregs[3]);
+ __get_user(env->regs[5], &gregs[4]);
+ __get_user(env->regs[6], &gregs[5]);
+ __get_user(env->regs[7], &gregs[6]);
+ __get_user(env->regs[8], &gregs[7]);
+ __get_user(env->regs[9], &gregs[8]);
+ __get_user(env->regs[10], &gregs[9]);
+ __get_user(env->regs[11], &gregs[10]);
+ __get_user(env->regs[12], &gregs[11]);
+ __get_user(env->regs[13], &gregs[12]);
+ __get_user(env->regs[14], &gregs[13]);
+ __get_user(env->regs[15], &gregs[14]);
+ __get_user(env->regs[16], &gregs[15]);
+ __get_user(env->regs[17], &gregs[16]);
+ __get_user(env->regs[18], &gregs[17]);
+ __get_user(env->regs[19], &gregs[18]);
+ __get_user(env->regs[20], &gregs[19]);
+ __get_user(env->regs[21], &gregs[20]);
+ __get_user(env->regs[22], &gregs[21]);
+ __get_user(env->regs[23], &gregs[22]);
+ /* gregs[23] is handled below */
+ /* Verify, should this be settable */
+ __get_user(env->regs[R_FP], &gregs[24]);
+ /* Verify, should this be settable */
+ __get_user(env->regs[R_GP], &gregs[25]);
+ /* Not really necessary no user settable bits */
+ __get_user(temp, &gregs[26]);
+ __get_user(env->regs[R_EA], &gregs[27]);
+
+ __get_user(env->regs[R_RA], &gregs[23]);
+ __get_user(env->regs[R_SP], &gregs[28]);
+
+ off = offsetof(struct target_rt_sigframe, uc.tuc_stack);
+ err = do_sigaltstack(frame_addr + off, 0, get_sp_from_cpustate(env));
+ if (err == -EFAULT) {
+ return 1;
+ }
+
+ *pr2 = env->regs[2];
+ return 0;
+}
+
+static void *get_sigframe(struct target_sigaction *ka, CPUNios2State *env,
+ size_t frame_size)
+{
+ unsigned long usp;
+
+ /* Default to using normal stack. */
+ usp = env->regs[R_SP];
+
+ /* This is the X/Open sanctioned signal stack switching. */
+ usp = sigsp(usp, ka);
+
+ /* Verify, is it 32 or 64 bit aligned */
+ return (void *)((usp - frame_size) & -8UL);
+}
+
+void setup_rt_frame(int sig, struct target_sigaction *ka,
+ target_siginfo_t *info,
+ target_sigset_t *set,
+ CPUNios2State *env)
+{
+ struct target_rt_sigframe *frame;
+ int i, err = 0;
+
+ frame = get_sigframe(ka, env, sizeof(*frame));
+
+ if (ka->sa_flags & SA_SIGINFO) {
+ tswap_siginfo(&frame->info, info);
+ }
+
+ /* Create the ucontext. */
+ __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(env->regs[R_SP]), &frame->uc.tuc_stack.ss_flags);
+ __put_user(target_sigaltstack_used.ss_size, &frame->uc.tuc_stack.ss_size);
+ err |= rt_setup_ucontext(&frame->uc, env);
+ for (i = 0; i < TARGET_NSIG_WORDS; i++) {
+ __put_user((abi_ulong)set->sig[i],
+ (abi_ulong *)&frame->uc.tuc_sigmask.sig[i]);
+ }
+
+ if (err) {
+ goto give_sigsegv;
+ }
+
+ /* Set up to return from userspace; jump to fixed address sigreturn
+ trampoline on kuser page. */
+ env->regs[R_RA] = (unsigned long) (0x1044);
+
+ /* Set up registers for signal handler */
+ env->regs[R_SP] = (unsigned long) frame;
+ env->regs[4] = (unsigned long) sig;
+ env->regs[5] = (unsigned long) &frame->info;
+ env->regs[6] = (unsigned long) &frame->uc;
+ env->regs[R_EA] = (unsigned long) ka->_sa_handler;
+ return;
+
+give_sigsegv:
+ if (sig == TARGET_SIGSEGV) {
+ ka->_sa_handler = TARGET_SIG_DFL;
+ }
+ force_sigsegv(sig);
+ return;
+}
+
+long do_sigreturn(CPUNios2State *env)
+{
+ trace_user_do_sigreturn(env, 0);
+ fprintf(stderr, "do_sigreturn: not implemented\n");
+ return -TARGET_ENOSYS;
+}
+
+long do_rt_sigreturn(CPUNios2State *env)
+{
+ /* Verify, can we follow the stack back */
+ abi_ulong frame_addr = env->regs[R_SP];
+ struct target_rt_sigframe *frame;
+ sigset_t set;
+ int rval;
+
+ if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) {
+ goto badframe;
+ }
+
+ target_to_host_sigset(&set, &frame->uc.tuc_sigmask);
+ do_sigprocmask(SIG_SETMASK, &set, NULL);
+
+ if (rt_restore_ucontext(env, &frame->uc, &rval)) {
+ goto badframe;
+ }
+
+ unlock_user_struct(frame, frame_addr, 0);
+ return rval;
+
+badframe:
+ unlock_user_struct(frame, frame_addr, 0);
+ force_sig(TARGET_SIGSEGV);
+ return 0;
+}
diff --git a/linux-user/nios2/target_signal.h b/linux-user/nios2/target_signal.h
index 23a8267696..aa78519025 100644
--- a/linux-user/nios2/target_signal.h
+++ b/linux-user/nios2/target_signal.h
@@ -23,4 +23,8 @@ static inline abi_ulong get_sp_from_cpustate(CPUNios2State *state)
return state->regs[R_SP];
}
+void setup_rt_frame(int sig, struct target_sigaction *ka,
+ target_siginfo_t *info,
+ target_sigset_t *set,
+ CPUNios2State *env);
#endif /* TARGET_SIGNAL_H */
generated by cgit v1.2.3 (git 2.26.2) at 2024-12-01 22:38:23 +0000