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llvm-project/compiler-rt/lib/builtins/arm/aeabi_memcmp.S

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Provide aeabi_mem* functions. llvm-svn: 149241
2012-01-30 18:21:23 +08:00
//===-- aeabi_memcmp.S - EABI memcmp implementation -----------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "../assembly.h"
// void __aeabi_memcmp(void *dest, void *src, size_t n) { memcmp(dest, src, n); }
[RT-ARM] Syntax unified for aeabi_mem* functions Use unified syntax for builtins/arm/aeabi_mem*.S. This makes these files consistent with the others. This fixes a problem on the linker, which can fail with the message "relocation truncated to fit: R_ARM_THM_JUMP11 against symbol" Patch by Kor Nielsen. llvm-svn: 275264
2016-07-13 22:01:15 +08:00
.syntax unified
[CompilerRT] use .p2align, .balign instead of .align The .align statements in ARM assembly routines is actually meant to be a power of 2 alignment (e.g. .align 2 == 4 byte alignment, not 2). Switch to using .p2align. .p2align is guaranteed to be a power-of-two alignment always and much more explicit. The .align in the case of x86_64 is byte alignment, use .balign instead of .align. llvm-svn: 208578
2014-05-12 23:23:37 +08:00
.p2align 2
Provide aeabi_mem* functions. llvm-svn: 149241
2012-01-30 18:21:23 +08:00
DEFINE_COMPILERRT_FUNCTION(__aeabi_memcmp)
[Builtins] Do not use tailcall for Thumb1 Summary: The `b` instruction in Thumb1 has limited range, which may cause link-time errors if the jump target is far away. This patch guards the tailcalls for non-Thumb1 Reviewers: peter.smith, compnerd, rengolin, eli.friedman Reviewed By: rengolin Subscribers: joerg, dalias, javed.absar, llvm-commits Differential Revision: https://reviews.llvm.org/D39700 llvm-svn: 317814
2017-11-10 01:32:57 +08:00
#ifdef USE_THUMB_1
push {r7, lr}
bl memcmp
pop {r7, pc}
#else
Provide aeabi_mem* functions. llvm-svn: 149241
2012-01-30 18:21:23 +08:00
b memcmp
[Builtins] Do not use tailcall for Thumb1 Summary: The `b` instruction in Thumb1 has limited range, which may cause link-time errors if the jump target is far away. This patch guards the tailcalls for non-Thumb1 Reviewers: peter.smith, compnerd, rengolin, eli.friedman Reviewed By: rengolin Subscribers: joerg, dalias, javed.absar, llvm-commits Differential Revision: https://reviews.llvm.org/D39700 llvm-svn: 317814
2017-11-10 01:32:57 +08:00
#endif
Mechanically add end-of-function markers. llvm-svn: 200005
2014-01-24 22:33:42 +08:00
END_COMPILERRT_FUNCTION(__aeabi_memcmp)
Provide aeabi_mem* functions. llvm-svn: 149241
2012-01-30 18:21:23 +08:00
DEFINE_AEABI_FUNCTION_ALIAS(__aeabi_memcmp4, __aeabi_memcmp)
DEFINE_AEABI_FUNCTION_ALIAS(__aeabi_memcmp8, __aeabi_memcmp)
builtins: tag with noexecstack These routines do not require executable stacks. However, by default ELFish linkers may assume an executable stack on GNUish environments (and some non-GNU ones too!). The GNU extension to add a note to indicate a non-executable stack is honoured by these environments to mark the stack as non-executable (the compiler normally emits this directive on appropriate targets whenever possible). This allows normal builds from getting executable stacks due to linking to the compiler rt builtins. llvm-svn: 273500
2016-06-23 06:09:42 +08:00
NO_EXEC_STACK_DIRECTIVE