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llvm-project/lld/test/ELF/arm-thumb-branch-error.s

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Add initial support for Thumb for ARMv7a Add support for the R_ARM_THM relocations used in the objects present in arm-linux-gnueabihf-gcc. These are: R_ARM_THM_CALL R_ARM_THM_JUMP11 R_ARM_THM_JUMP19 R_ARM_THM_JUMP24 R_ARM_THM_MOVT_ABS R_ARM_THM_MOVW_ABS_NC Interworking between ARM and Thumb is partially supported with BLX. The R_ARM_CALL relocation for ARM instructions and R_ARM_THM_CALL relocation for Thumb instructions will write out a BL or BLX depending on the state of the Target. Assumptions: - Availability of BLX and extended range of Thumb 4-byte Branch instructions. - In relocateOne if (Val & 0x1) == 1 target is Thumb, 0 is ARM. This will hold for objects that comply with the ABI for the ARM architecture. This is sufficient for hello world to work with a recent arm-linux-gnueabihf distribution. Limitations: No interworking for R_ARM_JUMP24, R_ARM_THM_JUMP24, R_ARM_THM_JUMP19 and the deprecated R_ARM_PLT32 and R_ARM_PC24 instructions as these cannot be written out as a BLX and need a state change thunk. No range extension thunks. The R_ARM_JUMP24 and R_ARM_THM_CALL have a range of 16Mb llvm-svn: 272881
2016-06-16 17:53:46 +08:00
// RUN: llvm-mc -filetype=obj -triple=thumbv7a-none-linux-gnueabi %s -o %t
// RUN: llvm-mc -filetype=obj -triple=thumbv7a-none-linux-gnueabi %S/Inputs/far-arm-thumb-abs.s -o %tfar
// RUN: not ld.lld %t %tfar -o %t2 2>&1 | FileCheck %s
// REQUIRES: arm
.syntax unified
.section .text, "ax",%progbits
.globl _start
.balign 0x10000
.type _start,%function
_start:
// address of too_far symbols are just out of range of ARM branch with
// 26-bit immediate field and an addend of -8
bl too_far1
b too_far2
beq.w too_far3
// CHECK: R_ARM_THM_CALL out of range
// CHECK-NEXT: R_ARM_THM_JUMP24 out of range
// CHECK-NEXT: R_ARM_THM_JUMP19 out of range