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* sysdeps/powerpc/strchr.S: Check bounds.

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Wrap extern symbols in BP_SYM ().
2000-07-03  Greg McGary  <greg@mcgary.org>

	* sysdeps/powerpc/strchr.S:  Check bounds.
	Wrap extern symbols in BP_SYM ().
This commit is contained in:
Greg McGary 2000-07-04 00:24:42 +00:00
parent 4ad1d0cfbf
commit b1fc7a6a98
2 changed files with 33 additions and 13 deletions
ChangeLog
sysdeps/powerpc
strchr.S

5
ChangeLog

@ -1,3 +1,8 @@
2000-07-03 Greg McGary <greg@mcgary.org>
* sysdeps/powerpc/strchr.S: Check bounds.
Wrap extern symbols in BP_SYM ().
2000-07-03 Andreas Jaeger <aj@suse.de>
* dlfcn/Makefile (generated): New.

41
sysdeps/powerpc/strchr.S

@ -18,36 +18,46 @@
Boston, MA 02111-1307, USA. */
#include <sysdep.h>
#include <bp-sym.h>
#include <bp-asm.h>
/* See strlen.s for comments on how this works. */
/* char * [r3] strchr (const char *s [r3] , int c [r4] ) */
ENTRY (strchr)
ENTRY (BP_SYM (strchr))
#define rTMP1 r0
#define rRTN r3 /* outgoing result */
#define rSTRin r3 /* incoming string arg */
#define rCHR r4 /* byte we're looking for, spread over the whole word */
#if __BOUNDED_POINTERS__
# define rSTR r4
# define rCHR r5 /* byte we're looking for, spread over the whole word */
# define rWORD r8 /* the current word */
#else
# define rSTR r3 /* current word pointer */
# define rCHR r4 /* byte we're looking for, spread over the whole word */
# define rWORD r5 /* the current word */
#endif
#define rCLZB rCHR /* leading zero byte count */
#define rWORD r5 /* the current word */
#define rFEFE r6 /* constant 0xfefefeff (-0x01010101) */
#define r7F7F r7 /* constant 0x7f7f7f7f */
#define rSTR r8 /* current word pointer */
#define rTMP2 r9
#define rIGN r10 /* number of bits we should ignore in the first word */
#define rMASK r11 /* mask with the bits to ignore set to 0 */
#define rTMP3 r12
CHECK_BOUNDS_LOW (rSTR, rTMP1, rTMP2)
STORE_RETURN_BOUNDS (rTMP1, rTMP2)
rlwimi rCHR, rCHR, 8, 16, 23
li rMASK, -1
rlwimi rCHR, rCHR, 16, 0, 15
rlwinm rIGN, rSTR, 3, 27, 28
lis rFEFE, -0x101
lis r7F7F, 0x7f7f
clrrwi rSTR, rSTRin, 2
addi r7F7F, r7F7F, 0x7f7f
clrrwi rSTR, rSTR, 2
addi rFEFE, rFEFE, -0x101
rlwinm rIGN, rSTRin, 3, 27, 28
addi r7F7F, r7F7F, 0x7f7f
/* Test the first (partial?) word. */
lwz rWORD, 0(rSTR)
srw rMASK, rMASK, rIGN
@ -80,7 +90,8 @@ L(loopentry):
happened, though. */
L(missed):
and. rTMP1, rTMP1, rTMP2
li rRTN, 0
li rSTR, 0
STORE_RETURN_VALUE (rSTR)
beqlr
/* It did happen. Decide which one was first...
I'm not sure if this is actually faster than a sequence of
@ -97,7 +108,9 @@ L(missed):
bgtlr
cntlzw rCLZB, rTMP2
srwi rCLZB, rCLZB, 3
add rRTN, rSTR, rCLZB
add rSTR, rSTR, rCLZB
CHECK_BOUNDS_HIGH_RTN (rSTR, rTMP2, twlge)
STORE_RETURN_VALUE (rSTR)
blr
L(foundit):
@ -108,8 +121,10 @@ L(foundit):
cntlzw rCLZB, rTMP2
subi rSTR, rSTR, 4
srwi rCLZB, rCLZB, 3
add rRTN, rSTR, rCLZB
add rSTR, rSTR, rCLZB
CHECK_BOUNDS_HIGH_RTN (rSTR, rTMP2, twlge)
STORE_RETURN_VALUE (rSTR)
blr
END (strchr)
END (BP_SYM (strchr))
weak_alias(strchr, index)
weak_alias (BP_SYM (strchr), BP_SYM (index))