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1999-04-14 Scott Bambrough  <scottb@netwinder.org>

	* sysdeps/unix/sysv/linux/arm/socket.S: Socket calls could not be
	restarted after being interrupted by a signal.  The parameters on
	the stack were corrupted by the signal handler.

	* sysdeps/unix/sysv/linux/arm/mmap.S: mmap calls could not be
	restarted after being interrupted by a signal.  The parameters on
	the stack were corrupted by the signal handler.
This commit is contained in:
Ulrich Drepper 1999-04-14 13:42:55 +00:00
parent 1156499bae
commit 9b2446e825
3 changed files with 56 additions and 11 deletions
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10
ChangeLog
View File

@ -1,3 +1,13 @@
1999-04-14 Scott Bambrough <scottb@netwinder.org>
* sysdeps/unix/sysv/linux/arm/socket.S: Socket calls could not be
restarted after being interrupted by a signal. The parameters on
the stack were corrupted by the signal handler.
* sysdeps/unix/sysv/linux/arm/mmap.S: mmap calls could not be
restarted after being interrupted by a signal. The parameters on
the stack were corrupted by the signal handler.
1999-04-14 Andreas Jaeger <aj@arthur.rhein-neckar.de>
* wctype/wcfuncs.c (towlower): Use __ctype_tolower.

22
sysdeps/unix/sysv/linux/arm/mmap.S
View File

@ -26,10 +26,26 @@ ENTRY (__mmap)
mmap() takes six, we need to build a parameter block and pass its
address instead. The 386 port does a similar trick. */
mov ip, sp
stmdb ip!, {a1-a4}
mov a1, ip
/* This code previously moved sp into ip and stored the args using
stmdb ip!, {a1-a4}. It did not modify sp, so the stack never had
to be restored after the syscall completed. It saved an
instruction and meant no stack cleanup work was required.
This will not work in the case of a mmap call being interrupted
by a signal. If the signal handler uses any stack the arguments
to mmap will be trashed. The results of a restart of mmap are
then unpredictable. */
/* store args on the stack */
stmdb sp!, {a1-a4}
/* do the syscall */
mov a1, sp
swi SYS_ify (mmap)
/* pop args off the stack. */
add sp, sp, #16
cmn r0, $4096
bhs PLTJMP(syscall_error);
ret

35
sysdeps/unix/sysv/linux/arm/socket.S
View File

@ -35,12 +35,19 @@
#define __socket P(__,socket)
#endif
#define PUSHARGS_1 stmfd ip!, {a1}
#define PUSHARGS_2 stmfd ip!, {a1, a2}
#define PUSHARGS_3 stmfd ip!, {a1, a2, a3}
#define PUSHARGS_4 stmfd ip!, {a1, a2, a3, a4}
#define PUSHARGS_5 stmfd ip!, {a1, a2, a3, a4} /* Caller has already pushed arg 5 */
#define PUSHARGS_6 stmfd ip!, {a1, a2, a3, a4}
#define PUSHARGS_1 stmfd sp!, {a1}
#define PUSHARGS_2 stmfd sp!, {a1, a2}
#define PUSHARGS_3 stmfd sp!, {a1, a2, a3}
#define PUSHARGS_4 stmfd sp!, {a1, a2, a3, a4}
#define PUSHARGS_5 stmfd sp!, {a1, a2, a3, a4} /* Caller has already pushed arg 5 */
#define PUSHARGS_6 stmfd sp!, {a1, a2, a3, a4}
#define POPARGS_1 add sp, sp, #4
#define POPARGS_2 add sp, sp, #8
#define POPARGS_3 add sp, sp, #12
#define POPARGS_4 add sp, sp, #16
#define POPARGS_5 add sp, sp, #16
#define POPARGS_6 add sp, sp, #16
#ifndef NARGS
#define NARGS 3 /* If we were called with no wrapper, this is really socket() */
@ -48,15 +55,27 @@
.globl __socket
ENTRY (__socket)
/* This code previously moved sp into ip and stored the args using
stmdb ip!, {a1-a4}. It did not modify sp, so the stack never had
to be restored after the syscall completed. It saved an
instruction and meant no stack cleanup work was required.
This will not work in the case of a socket call being interrupted
by a signal. If the signal handler uses any stack the arguments
to socket will be trashed. The results of a restart of any
socket call are then unpredictable. */
/* Push args onto the stack. */
mov ip, sp
P(PUSHARGS_,NARGS)
/* Do the system call trap. */
mov a1, $P(SOCKOP_,socket)
mov a2, ip
mov a2, sp
swi SYS_ify(socketcall)
/* Pop args off the stack */
P(POPARGS_,NARGS)
/* r0 is < 0 if there was an error. */
cmn r0, $124
bhs PLTJMP(syscall_error)