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Diffstat (limited to 'sysdeps/mach/hurd/i386/trampoline.c')
-rw-r--r--sysdeps/mach/hurd/i386/trampoline.c128
1 files changed, 118 insertions, 10 deletions
diff --git a/sysdeps/mach/hurd/i386/trampoline.c b/sysdeps/mach/hurd/i386/trampoline.c
index 0e795f9389..7eca1db020 100644
--- a/sysdeps/mach/hurd/i386/trampoline.c
+++ b/sysdeps/mach/hurd/i386/trampoline.c
@@ -19,13 +19,66 @@
#include <hurd/signal.h>
#include <hurd/userlink.h>
#include <thread_state.h>
+#include <mach/exception.h>
#include <mach/machine/eflags.h>
#include <assert.h>
#include <errno.h>
#include "hurdfault.h"
#include <intr-msg.h>
+#include <sys/ucontext.h>
+/* Fill in a siginfo_t structure for SA_SIGINFO-enabled handlers. */
+static void fill_siginfo (siginfo_t *si, int signo,
+ const struct hurd_signal_detail *detail,
+ const struct machine_thread_all_state *state)
+{
+ si->si_signo = signo;
+ si->si_errno = detail->error;
+ si->si_code = detail->code;
+
+ /* XXX We would need a protocol change for sig_post to include
+ * this information. */
+ si->si_pid = -1;
+ si->si_uid = -1;
+
+ /* Address of the faulting instruction or memory access. */
+ if (detail->exc == EXC_BAD_ACCESS)
+ si->si_addr = (void *) detail->exc_subcode;
+ else
+ si->si_addr = (void *) state->basic.eip;
+
+ /* XXX On SIGCHLD, this should be the exit status of the child
+ * process. We would need a protocol change for the proc server
+ * to send this information along with the signal. */
+ si->si_status = 0;
+
+ si->si_band = 0; /* SIGPOLL is not supported yet. */
+ si->si_value.sival_int = 0; /* sigqueue() is not supported yet. */
+}
+
+/* Fill in a ucontext_t structure SA_SIGINFO-enabled handlers. */
+static void fill_ucontext (ucontext_t *uc, const struct sigcontext *sc)
+{
+ uc->uc_flags = 0;
+ uc->uc_link = NULL;
+ uc->uc_sigmask = sc->sc_mask;
+ uc->uc_stack.ss_sp = (__ptr_t) sc->sc_esp;
+ uc->uc_stack.ss_size = 0;
+ uc->uc_stack.ss_flags = 0;
+
+ /* Registers. */
+ memcpy (&uc->uc_mcontext.gregs[REG_GS], &sc->sc_gs,
+ (REG_TRAPNO - REG_GS) * sizeof (int));
+ uc->uc_mcontext.gregs[REG_TRAPNO] = 0;
+ uc->uc_mcontext.gregs[REG_ERR] = 0;
+ memcpy (&uc->uc_mcontext.gregs[REG_EIP], &sc->sc_eip,
+ (NGREG - REG_EIP) * sizeof (int));
+
+ /* XXX FPU state. */
+ memset (&uc->uc_mcontext.fpregs, 0, sizeof (fpregset_t));
+}
+
struct sigcontext *
_hurd_setup_sighandler (struct hurd_sigstate *ss, __sighandler_t handler,
int signo, struct hurd_signal_detail *detail,
@@ -37,20 +90,44 @@ _hurd_setup_sighandler (struct hurd_sigstate *ss, __sighandler_t handler,
void firewall (void);
extern const void _hurd_intr_rpc_msg_cx_sp;
extern const void _hurd_intr_rpc_msg_sp_restored;
+ const struct sigaction *action;
void *volatile sigsp;
struct sigcontext *scp;
struct
{
int signo;
- long int sigcode;
- struct sigcontext *scp; /* Points to ctx, below. */
+ union
+ {
+ /* Extra arguments for traditional signal handlers */
+ struct
+ {
+ long int sigcode;
+ struct sigcontext *scp; /* Points to ctx, below. */
+ } legacy;
+
+ /* Extra arguments for SA_SIGINFO handlers */
+ struct
+ {
+ siginfo_t *siginfop; /* Points to siginfo, below. */
+ ucontext_t *uctxp; /* Points to uctx, below. */
+ } posix;
+ };
void *sigreturn_addr;
void *sigreturn_returns_here;
struct sigcontext *return_scp; /* Same; arg to sigreturn. */
+
+ /* NB: sigreturn assumes link is next to ctx. */
struct sigcontext ctx;
struct hurd_userlink link;
+ ucontext_t ucontext;
+ siginfo_t siginfo;
} *stackframe;
+ /* sigaction for preemptors */
+ static const struct sigaction legacy_sigaction = {
+ .sa_flags = SA_RESTART
+ };
+
if (ss->context)
{
/* We have a previous sigcontext that sigreturn was about
@@ -74,7 +151,15 @@ _hurd_setup_sighandler (struct hurd_sigstate *ss, __sighandler_t handler,
interrupted RPC frame. */
state->basic.esp = state->basic.uesp;
- if ((ss->actions[signo].sa_flags & SA_ONSTACK) &&
+ action = & _hurd_sigstate_actions (ss) [signo];
+ if ( (action->sa_flags & SA_SIGINFO)
+ && handler != (__sighandler_t) action->sa_sigaction
+ || !(action->sa_flags & SA_SIGINFO)
+ && handler != action->sa_handler)
+ /* A signal preemptor took over, use legacy semantic. */
+ action = &legacy_sigaction;
+
+ if ((action->sa_flags & SA_ONSTACK) &&
!(ss->sigaltstack.ss_flags & (SS_DISABLE|SS_ONSTACK)))
{
sigsp = ss->sigaltstack.ss_sp + ss->sigaltstack.ss_size;
@@ -134,15 +219,9 @@ _hurd_setup_sighandler (struct hurd_sigstate *ss, __sighandler_t handler,
= &stackframe->link.thread.next;
ss->active_resources = &stackframe->link;
- /* Set up the arguments for the signal handler. */
- stackframe->signo = signo;
- stackframe->sigcode = detail->code;
- stackframe->scp = stackframe->return_scp = scp = &stackframe->ctx;
- stackframe->sigreturn_addr = &__sigreturn;
- stackframe->sigreturn_returns_here = firewall; /* Crash on return. */
-
/* Set up the sigcontext from the current state of the thread. */
+ scp = &stackframe->ctx;
scp->sc_onstack = ss->sigaltstack.ss_flags & SS_ONSTACK ? 1 : 0;
/* struct sigcontext is laid out so that starting at sc_gs mimics a
@@ -156,6 +235,35 @@ _hurd_setup_sighandler (struct hurd_sigstate *ss, __sighandler_t handler,
&state->fpu, &scp->sc_i386_float_state,
sizeof (state->fpu));
+ /* Set up the arguments for the signal handler. */
+ stackframe->signo = signo;
+ if (action->sa_flags & SA_SIGINFO)
+ {
+ stackframe->posix.siginfop = &stackframe->siginfo;
+ stackframe->posix.uctxp = &stackframe->ucontext;
+ fill_siginfo (&stackframe->siginfo, signo, detail, state);
+ fill_ucontext (&stackframe->ucontext, scp);
+ }
+ else
+ {
+ if (detail->exc)
+ {
+ int nsigno;
+ _hurd_exception2signal_legacy (detail, &nsigno);
+ assert (nsigno == signo);
+ }
+ else
+ detail->code = 0;
+
+ stackframe->legacy.sigcode = detail->code;
+ stackframe->legacy.scp = &stackframe->ctx;
+ }
+
+ /* Set up the bottom of the stack. */
+ stackframe->sigreturn_addr = &__sigreturn;
+ stackframe->sigreturn_returns_here = firewall; /* Crash on return. */
+ stackframe->return_scp = &stackframe->ctx;
+
_hurdsig_end_catch_fault ();
if (! ok)