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Add support for an alternate signal trampoline; add a sysarch call to register

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an alternate trampoling with the kernel.
This commit is contained in:
Jake Burkholder 2002-04-29 18:08:26 +00:00
parent 43a7c4e919
commit e289cb8fe7
5 changed files with 37 additions and 1 deletions
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1
sys/sparc64/include/proc.h
View File

@ -52,6 +52,7 @@ struct mdthread {
struct mdproc {
struct md_utrap *md_utrap;
void *md_sigtramp;
};
#endif /* !_MACHINE_PROC_H_ */

6
sys/sparc64/include/sysarch.h
View File

@ -41,12 +41,18 @@
#define _MACHINE_SYSARCH_H_
#define SPARC_UTRAP_INSTALL 1
#define SPARC_SIGTRAMP_INSTALL 2
struct sparc_utrap_install_args {
int num;
const struct sparc_utrap_args *handlers;
};
struct sparc_sigtramp_install_args {
void *sia_new;
void **sia_old;
};
struct sparc_utrap_args {
utrap_entry_t type;
utrap_handler_t new_precise;

7
sys/sparc64/sparc64/machdep.c
View File

@ -282,6 +282,7 @@ sparc64_init(caddr_t mdp, u_long o1, u_long o2, u_long o3, ofw_vec_t *vec)
* Initialize proc0 stuff (p_contested needs to be done early).
*/
proc_linkup(&proc0, &proc0.p_ksegrp, &proc0.p_kse, &thread0);
proc0.p_md.md_sigtramp = NULL;
proc0.p_md.md_utrap = NULL;
proc0.p_uarea = (struct user *)uarea0;
proc0.p_stats = &proc0.p_uarea->u_stats;
@ -418,7 +419,10 @@ sendsig(sig_t catcher, int sig, sigset_t *mask, u_long code)
/* NOTREACHED */
}
tf->tf_tpc = PS_STRINGS - *(p->p_sysent->sv_szsigcode);
if (p->p_md.md_sigtramp != NULL)
tf->tf_tpc = (u_long)p->p_md.md_sigtramp;
else
tf->tf_tpc = PS_STRINGS - *(p->p_sysent->sv_szsigcode);
tf->tf_tnpc = tf->tf_tpc + 4;
tf->tf_sp = (u_long)fp - SPOFF;
@ -580,6 +584,7 @@ setregs(struct thread *td, u_long entry, u_long stack, u_long ps_strings)
u_long sp;
/* XXX no cpu_exec */
td->td_proc->p_md.md_sigtramp = NULL;
if ((ut = td->td_proc->p_md.md_utrap) != NULL) {
ut->ut_refcnt--;
if (ut->ut_refcnt == 0)

22
sys/sparc64/sparc64/sys_machdep.c
View File

@ -35,6 +35,7 @@
#include <machine/utrap.h>
#include <machine/sysarch.h>
static int sparc_sigtramp_install(struct thread *td, char *args);
static int sparc_utrap_install(struct thread *td, char *args);
#ifndef _SYS_SYSPROTO_H_
@ -51,6 +52,9 @@ sysarch(struct thread *td, struct sysarch_args *uap)
error = 0;
switch (uap->op) {
case SPARC_SIGTRAMP_INSTALL:
error = sparc_sigtramp_install(td, uap->parms);
break;
case SPARC_UTRAP_INSTALL:
error = sparc_utrap_install(td, uap->parms);
break;
@ -61,6 +65,24 @@ sysarch(struct thread *td, struct sysarch_args *uap)
return (error);
}
static int
sparc_sigtramp_install(struct thread *td, char *args)
{
struct sparc_sigtramp_install_args sia;
struct proc *p;
int error;
p = td->td_proc;
if ((error = copyin(args, &sia, sizeof(sia))) != 0)
return (error);
if (sia.sia_old != NULL) {
if (suword(sia.sia_old, (long)p->p_md.md_sigtramp) != 0)
return (EFAULT);
}
p->p_md.md_sigtramp = sia.sia_new;
return (0);
}
static int
sparc_utrap_install(struct thread *td, char *args)
{

2
sys/sparc64/sparc64/vm_machdep.c
View File

@ -77,6 +77,7 @@ cpu_exit(struct thread *td)
struct proc *p;
p = td->td_proc;
p->p_md.md_sigtramp = NULL;
if ((ut = p->p_md.md_utrap) != NULL) {
ut->ut_refcnt--;
if (ut->ut_refcnt == 0)
@ -108,6 +109,7 @@ cpu_fork(struct thread *td1, struct proc *p2, struct thread *td2, int flags)
if ((flags & RFPROC) == 0)
return;
p2->p_md.md_sigtramp = td1->td_proc->p_md.md_sigtramp;
if ((ut = td1->td_proc->p_md.md_utrap) != NULL)
ut->ut_refcnt++;
p2->p_md.md_utrap = ut;