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Wed, 26 Oct 2022 11:50:04 +0000 From: "Victor L. Do Nascimento" To: CC: Subject: [PATCH v4 5/8] newlib: libc: memcpy 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 11:50:16.6892 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 88755fb6-7aef-41f5-c3b8-08dab7484021 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: VI1EUR03FT004.eop-EUR03.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PR3PR08MB5833 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/memcpy-armv7m.S | 37 +++++++++++++++++-------- 1 file changed, 26 insertions(+), 11 deletions(-) diff --git a/newlib/libc/machine/arm/memcpy-armv7m.S b/newlib/libc/machine/arm/memcpy-armv7m.S index c8bff36f6..a74bacc97 100644 --- a/newlib/libc/machine/arm/memcpy-armv7m.S +++ b/newlib/libc/machine/arm/memcpy-armv7m.S @@ -46,6 +46,8 @@ __OPT_BIG_BLOCK_SIZE: Size of big block in words. Default to 64. __OPT_MID_BLOCK_SIZE: Size of big block in words. Default to 16. */ +#include "arm_asm.h" + #ifndef __OPT_BIG_BLOCK_SIZE #define __OPT_BIG_BLOCK_SIZE (4 * 16) #endif @@ -85,6 +87,8 @@ .global memcpy .thumb .thumb_func + .fnstart + .cfi_startproc .type memcpy, %function memcpy: @ r0: dst @@ -93,10 +97,11 @@ memcpy: #ifdef __ARM_FEATURE_UNALIGNED /* In case of UNALIGNED access supported, ip is not used in function body. */ + prologue push_ip=HAVE_PAC_LEAF mov ip, r0 #else - push {r0} -#endif + prologue 0 push_ip=HAVE_PAC_LEAF +#endif /* __ARM_FEATURE_UNALIGNED */ orr r3, r1, r0 ands r3, r3, #3 bne .Lmisaligned_copy @@ -135,13 +140,13 @@ memcpy: ldr r3, [r1], #4 str r3, [r0], #4 END_UNROLL -#else /* __ARM_ARCH_7M__ */ +#else ldr r3, [r1, \offset] str r3, [r0, \offset] END_UNROLL adds r0, __OPT_MID_BLOCK_SIZE adds r1, __OPT_MID_BLOCK_SIZE -#endif +#endif /* __ARM_ARCH_7M__ */ subs r2, __OPT_MID_BLOCK_SIZE bhs .Lmid_block_loop @@ -178,15 +183,17 @@ memcpy: #endif /* __ARM_FEATURE_UNALIGNED */ .Ldone: + .cfi_remember_state #ifdef __ARM_FEATURE_UNALIGNED mov r0, ip + epilogue push_ip=HAVE_PAC_LEAF #else - pop {r0} -#endif - bx lr + epilogue 0 push_ip=HAVE_PAC_LEAF +#endif /* __ARM_FEATURE_UNALIGNED */ .align 2 .Lmisaligned_copy: + .cfi_restore_state #ifdef __ARM_FEATURE_UNALIGNED /* Define label DST_ALIGNED to BIG_BLOCK. It will go to aligned copy once destination is adjusted to aligned. */ @@ -247,6 +254,9 @@ memcpy: /* dst is aligned, but src isn't. Misaligned copy. */ push {r4, r5} + .cfi_adjust_cfa_offset 8 + .cfi_rel_offset 4, 0 + .cfi_rel_offset 5, 4 subs r2, #4 /* Backward r1 by misaligned bytes, to make r1 aligned. @@ -299,6 +309,9 @@ memcpy: adds r2, #4 subs r1, ip pop {r4, r5} + .cfi_restore 4 + .cfi_restore 5 + .cfi_adjust_cfa_offset -8 #endif /* __ARM_FEATURE_UNALIGNED */ @@ -321,9 +334,11 @@ memcpy: #ifdef __ARM_FEATURE_UNALIGNED mov r0, ip + epilogue push_ip=HAVE_PAC_LEAF #else - pop {r0} -#endif - bx lr - + epilogue 0 push_ip=HAVE_PAC_LEAF +#endif /* __ARM_FEATURE_UNALIGNED */ + .cfi_endproc + .cantunwind + .fnend .size memcpy, .-memcpy -- 2.36.1