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Do Nascimento" To: CC: Subject: [PATCH v4 4/8] newlib: libc: memchr M-profile PACBTI-enablement In-Reply-To: (Victor L. 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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 26 Oct 2022 11:49:19.6301 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 2ebb87b5-4651-45ba-28b5-08dab7481e2b X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[63.35.35.123];Helo=[64aa7808-outbound-1.mta.getcheckrecipient.com] X-MS-Exchange-CrossTenant-AuthSource: VI1EUR03FT009.eop-EUR03.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AS8PR08MB8038 X-Spam-Status: No, score=-13.0 required=5.0 tests=BAYES_00,DKIM_SIGNED,DKIM_VALID,FORGED_SPF_HELO,GIT_PATCH_0,KAM_DMARC_NONE,RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H2,SPF_HELO_PASS,SPF_NONE,TXREP,UNPARSEABLE_RELAY autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: Add function prologue/epilogue to conditionally add BTI landing pads and/or PAC code generation & authentication instructions depending on compilation flags. --- newlib/libc/machine/arm/memchr.S | 42 +++++++++++++++++++++++++++----- 1 file changed, 36 insertions(+), 6 deletions(-) diff --git a/newlib/libc/machine/arm/memchr.S b/newlib/libc/machine/arm/memchr.S index 1a4c6512c..5b051123d 100644 --- a/newlib/libc/machine/arm/memchr.S +++ b/newlib/libc/machine/arm/memchr.S @@ -76,6 +76,7 @@ .syntax unified #include "acle-compat.h" +#include "arm_asm.h" @ NOTE: This ifdef MUST match the one in memchr-stub.c #if defined (__ARM_NEON__) || defined (__ARM_NEON) @@ -267,10 +268,14 @@ memchr: #elif __ARM_ARCH_ISA_THUMB >= 2 && defined (__ARM_FEATURE_DSP) #if __ARM_ARCH_PROFILE == 'M' - .arch armv7e-m +#if __ARM_ARCH >= 8 + /* keep config inherited from -march=. */ #else - .arch armv6t2 -#endif + .arch armv7e-m +#endif /* __ARM_ARCH >= 8 */ +#else + .arch armv6t2 +#endif /* __ARM_ARCH_PROFILE == 'M' */ @ this lets us check a flag in a 00/ff byte easily in either endianness #ifdef __ARMEB__ @@ -287,11 +292,14 @@ memchr: .p2align 4,,15 .global memchr .type memchr,%function + .fnstart + .cfi_startproc memchr: @ r0 = start of memory to scan @ r1 = character to look for @ r2 = length @ returns r0 = pointer to character or NULL if not found + prologue and r1,r1,#0xff @ Don't trust the caller to pass a char cmp r2,#16 @ If short don't bother with anything clever @@ -313,6 +321,11 @@ memchr: 10: @ We are aligned, we know we have at least 8 bytes to work with push {r4,r5,r6,r7} + .cfi_adjust_cfa_offset 16 + .cfi_rel_offset 4, 0 + .cfi_rel_offset 5, 4 + .cfi_rel_offset 6, 8 + .cfi_rel_offset 7, 12 orr r1, r1, r1, lsl #8 @ expand the match word across all bytes orr r1, r1, r1, lsl #16 bic r4, r2, #7 @ Number of double words to work with * 8 @@ -334,6 +347,11 @@ memchr: bne 15b @ (Flags from the subs above) pop {r4,r5,r6,r7} + .cfi_restore 7 + .cfi_restore 6 + .cfi_restore 5 + .cfi_restore 4 + .cfi_adjust_cfa_offset -16 and r1,r1,#0xff @ r1 back to a single character and r2,r2,#7 @ Leave the count remaining as the number @ after the double words have been done @@ -349,17 +367,21 @@ memchr: bne 21b @ on r2 flags 40: + .cfi_remember_state movs r0,#0 @ not found - bx lr + epilogue 50: + .cfi_restore_state + .cfi_remember_state subs r0,r0,#1 @ found - bx lr + epilogue 60: @ We're here because the fast path found a hit @ now we have to track down exactly which word it was @ r0 points to the start of the double word after the one tested @ r5 has the 00/ff pattern for the first word, r6 has the chained value + .cfi_restore_state cmp r5, #0 itte eq moveq r5, r6 @ the end is in the 2nd word @@ -379,8 +401,16 @@ memchr: 61: pop {r4,r5,r6,r7} + .cfi_restore 7 + .cfi_restore 6 + .cfi_restore 5 + .cfi_restore 4 + .cfi_adjust_cfa_offset -16 subs r0,r0,#1 - bx lr + epilogue + .cfi_endproc + .cantunwind + .fnend #else /* Defined in memchr-stub.c. */ #endif -- 2.36.1