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llvm-project/lld/test/ELF/arm-blx-v4t.s

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[ELF] Move `// REQUIRES:` line to the top llvm-svn: 335676
2018-06-27 06:20:04 +08:00
// REQUIRES: arm
[ELF] Add support for older Arm Architectures with smaller branch range The Thumb BL and BLX instructions on older Arm Architectures such as v5 and v6 have a constrained encoding J1 and J2 must equal 1, later Architectures relaxed this restriction allowing J1 and J2 to be used to calculate a larger immediate. This patch adds support for the old encoding, it is used when the build attributes for the input objects only contain older architectures. Differential Revision: https://reviews.llvm.org/D50076 llvm-svn: 340159
2018-08-20 17:19:30 +08:00
// RUN: llvm-mc -arm-add-build-attributes -filetype=obj -triple=arm-none-linux-gnueabi %s -o %t
[ELF] Replace unused output filenames with /dev/null in tests Post commit review at rLLD335992 llvm-svn: 336129
2018-07-03 01:48:23 +08:00
// RUN: ld.lld %t -o /dev/null 2>&1 | FileCheck %s
[ELF] Read ARM BuildAttributes section to determine supported features. lld assumes some ARM features that are not available in all Arm processors. In particular: - The blx instruction present for interworking. - The movt/movw instructions are used in Thunks. - The J1=1 J2=1 encoding of branch immediates to improve Thumb wide branch range are assumed to be present. This patch reads the ARM Attributes section to check for the architecture the object file was compiled with. If none of the objects have an architecture that supports either of these features a warning will be given. This is most likely to affect armv6 as used in the first Raspberry Pi. Differential Revision: https://reviews.llvm.org/D36823 llvm-svn: 319169
2017-11-28 21:51:48 +08:00
// On Arm v4t there is no blx instruction so all interworking must go via
// a thunk. At present we don't support v4t so we give a warning for unsupported
// features.
Remove full stops from error messages for consistency. llvm-svn: 345294
2018-10-26 02:07:55 +08:00
// CHECK: warning: lld uses blx instruction, no object with architecture supporting feature detected
[ELF] Read ARM BuildAttributes section to determine supported features. lld assumes some ARM features that are not available in all Arm processors. In particular: - The blx instruction present for interworking. - The movt/movw instructions are used in Thunks. - The J1=1 J2=1 encoding of branch immediates to improve Thumb wide branch range are assumed to be present. This patch reads the ARM Attributes section to check for the architecture the object file was compiled with. If none of the objects have an architecture that supports either of these features a warning will be given. This is most likely to affect armv6 as used in the first Raspberry Pi. Differential Revision: https://reviews.llvm.org/D36823 llvm-svn: 319169
2017-11-28 21:51:48 +08:00
.text
.syntax unified
.cpu arm7tdmi
.arm
.globl _start
.type _start,%function
.p2align 2
_start:
bl thumbfunc
bx lr
.thumb
.section .text.2, "ax", %progbits
.globl thumbfunc
.type thumbfunc,%function
thumbfunc:
bx lr