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2003-01-20 Roland McGrath <roland@redhat.com>

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* defs.h [LINUX] [S390 || S390X] (TCB_WAITEXECVE): Define it.
	* syscall.c (get_scno, syscall_fixup) [LINUX] [S390 || S390X]: Handle
	TCB_WAITEXECVE state with special kludges.
This commit is contained in:
Roland McGrath 2003-01-20 10:23:04 +00:00
parent 08eee593ea
commit 96dc5148ff
2 changed files with 34 additions and 3 deletions
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2
defs.h
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@ -301,7 +301,7 @@ struct tcb {
#define TCB_FOLLOWFORK 00400 /* Process should have forks followed */
#define TCB_REPRINT 01000 /* We should reprint this syscall on exit */
#ifdef LINUX
# if defined(ALPHA) || defined(SPARC) || defined(POWERPC) || defined(IA64) || defined(HPPA) || defined(SH)
# if defined(ALPHA) || defined(SPARC) || defined(POWERPC) || defined(IA64) || defined(HPPA) || defined(SH) || defined(S390) || defined(S390X)
# define TCB_WAITEXECVE 02000 /* ignore SIGTRAP after exceve */
# endif
# define TCB_CLONE_DETACHED 04000 /* CLONE_DETACHED set in creating syscall */

35
syscall.c
View File

@ -730,12 +730,31 @@ struct tcb *tcp;
#if defined(S390) || defined(S390X)
if (upeek(pid, PT_GPR2, &syscall_mode) < 0)
return -1;
if (syscall_mode != -ENOSYS){
if (syscall_mode != -ENOSYS) {
/*
* Since kernel version 2.5.44 the scno gets passed in gpr2.
*/
scno = syscall_mode;
}
if (tcp->flags & TCB_WAITEXECVE) {
/*
* When the execve system call completes successfully, the
* new process still has -ENOSYS (old style) or __NR_execve
* (new style) in gpr2. We cannot recover the scno again
* by disassembly, because the image that executed the
* syscall is gone now. Fortunately, we don't want it. We
* leave the flag set so that syscall_fixup can fake the
* result.
*/
if (tcp->flags & TCB_INSYSCALL)
return 1;
/*
* This is the SIGTRAP after execve. We cannot try to read
* the system call here either.
*/
tcp->flags &= ~TCB_WAITEXECVE;
return 0;
}
else {
/*
* Old style of "passing" the scno via the SVC instruction.
@ -750,9 +769,12 @@ struct tcb *tcp;
if (upeek(pid, PT_PSWADDR, &pc) < 0)
return -1;
errno = 0;
opcode = ptrace(PTRACE_PEEKTEXT, pid, (char *)(pc-sizeof(long)), 0);
if (errno)
if (errno) {
perror("peektext(pc-oneword)");
return -1;
}
/*
* We have to check if the SVC got executed directly or via an
@ -1202,6 +1224,15 @@ struct tcb *tcp;
fprintf(stderr, "stray syscall exit: gpr2 = %ld\n", gpr2);
return 0;
}
else if (((tcp->flags & (TCB_INSYSCALL|TCB_WAITEXECVE))
== (TCB_INSYSCALL|TCB_WAITEXECVE))
&& (gpr2 == -ENOSYS || gpr2 == tcp->scno)) {
/*
* Fake a return value of zero. We leave the TCB_WAITEXECVE
* flag set for the post-execve SIGTRAP to see and reset.
*/
gpr2 = 0;
}
#elif defined (POWERPC)
# define SO_MASK 0x10000000
if (upeek(pid, sizeof(unsigned long)*PT_CCR, &flags) < 0)