# RUN: rm -rf %t && mkdir -p %t/armv4t && mkdir -p %t/armv6 && mkdir -p %t/armv7
#
# RUN: llvm-mc -triple=armv4t-linux-gnueabi -arm-add-build-attributes \
# RUN: -filetype=obj -o %t/armv4t/out.o %s
# RUN: llvm-jitlink -noexec -slab-address 0x76ff0000 \
# RUN: -slab-allocate 10Kb -slab-page-size 4096 \
# RUN: -abs ext=0x76bbe880 -check %s %t/armv4t/out.o
#
# RUN: llvm-mc -triple=armv6-linux-gnueabi -arm-add-build-attributes \
# RUN: -filetype=obj -o %t/armv6/out.o %s
# RUN: llvm-jitlink -noexec -slab-address 0x76ff0000 \
# RUN: -slab-allocate 10Kb -slab-page-size 4096 \
# RUN: -abs ext=0x76bbe880 -check %s %t/armv6/out.o
#
# RUN: llvm-mc -triple=armv7-linux-gnueabi -arm-add-build-attributes \
# RUN: -filetype=obj -o %t/armv7/out.o %s
# RUN: llvm-jitlink -noexec -slab-address 0x76ff0000 \
# RUN: -slab-allocate 10Kb -slab-page-size 4096 \
# RUN: -abs ext=0x76bbe880 -check %s %t/armv7/out.o
.text
.syntax unified
# Check that calls/jumps to external functions trigger the generation of
# branch-range extension stubs. These stubs don't follow the default PLT model
# where the branch-target address is loaded from a GOT entry. Instead, they
# hard-code it in the immediate field.
# The external function ext will return to the caller directly.
# jitlink-check: decode_operand(test_arm_jump, 0) = stub_addr(out.o, ext) - next_pc(test_arm_jump)
.globl test_arm_jump
.type test_arm_jump,%function
.p2align 2
test_arm_jump:
b ext
.size test_arm_jump, .-test_arm_jump
# The branch-with-link sets the LR register so that the external function ext
# returns to us. We have to save the register (push) and return to main manually
# (pop). This adds the +4 offset for the bl instruction we decode:
# jitlink-check: decode_operand(test_arm_call + 4, 0) = stub_addr(out.o, ext) - next_pc(test_arm_call) - 4
.globl test_arm_call
.type test_arm_call,%function
.p2align 2
test_arm_call:
push {lr}
bl ext
pop {pc}
.size test_arm_call, .-test_arm_call
# This test is executable with any Arm (and for v7+ also Thumb) `ext` functions.
# It only has to return with `bx lr`. For example:
# > echo "void ext() {}" | clang -target armv7-linux-gnueabihf -o ext.o -c -xc -
# > llvm-jitlink ext.o out.o
#
.globl main
.type main,%function
.p2align 2
main:
push {lr}
bl test_arm_call
bl test_arm_jump
mov r0, #0
pop {pc}
.size main, .-main
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