diff options
| -rw-r--r-- | ChangeLog | 5 | ||||
| -rw-r--r-- | sysdeps/powerpc/strchr.S | 41 |
2 files changed, 33 insertions, 13 deletions
@@ -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. diff --git a/sysdeps/powerpc/strchr.S b/sysdeps/powerpc/strchr.S index 4662447179..fd67c301b3 100644 --- a/sysdeps/powerpc/strchr.S +++ b/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)) |