55929cd679
This stub type loads an absolute address directly into the PC register. It's the simplest and most compatible way to implement a branch indirection across the entire address space (and probably the slowest as well). It's the ideal fallback for all targets for which we did not (yet) implement a more performant solution.
120 lines
3.8 KiB
ArmAsm
120 lines
3.8 KiB
ArmAsm
# RUN: rm -rf %t && mkdir -p %t/armv6 && mkdir -p %t/armv7 && mkdir -p %t/thumbv7
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# RUN: llvm-mc -triple=armv6-none-linux-gnueabi -arm-add-build-attributes -filetype=obj -o %t/armv6/out.o %s
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# RUN: llvm-objdump -r %t/armv6/out.o | FileCheck --check-prefix=CHECK-TYPE %s
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# RUN: llvm-jitlink -noexec -slab-address 0x76ff0000 -slab-allocate 10Kb -slab-page-size 4096 \
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# RUN: -abs target=0x76bbe88f -check %s %t/armv6/out.o
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# RUN: llvm-mc -triple=armv7-none-linux-gnueabi -arm-add-build-attributes -filetype=obj -o %t/armv7/out.o %s
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# RUN: llvm-objdump -r %t/armv7/out.o | FileCheck --check-prefix=CHECK-TYPE %s
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# RUN: llvm-jitlink -noexec -slab-address 0x76ff0000 -slab-allocate 10Kb -slab-page-size 4096 \
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# RUN: -abs target=0x76bbe88f -check %s %t/armv7/out.o
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# RUN: llvm-mc -triple=thumbv7-none-linux-gnueabi -arm-add-build-attributes -filetype=obj -o %t/thumbv7/out.o %s
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# RUN: llvm-objdump -r %t/thumbv7/out.o | FileCheck --check-prefix=CHECK-TYPE %s
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# RUN: llvm-jitlink -noexec -slab-address 0x76ff0000 -slab-allocate 10Kb -slab-page-size 4096 \
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# RUN: -abs target=0x76bbe88f -check %s %t/thumbv7/out.o
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.data
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.global target
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.text
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.syntax unified
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# CHECK-TYPE: {{[0-9a-f]+}} R_ARM_ABS32 target
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# jitlink-check: *{4}(abs32) = target
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.global abs32
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abs32:
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.word target
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.size abs32, .-abs32
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# CHECK-TYPE: {{[0-9a-f]+}} R_ARM_REL32 target
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# jitlink-check: (rel32 + *{4}(rel32))[31:0] = target
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.global rel32
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rel32:
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.word target - .
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.size rel32, .-rel32
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# CHECK-TYPE: {{[0-9a-f]+}} R_ARM_TARGET1 target
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# jitlink-check: *{4}(target1_abs32) = target
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.global target1_abs32
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target1_abs32:
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.word target(target1)
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.size target1_abs32, .-target1_abs32
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# CHECK-TYPE: {{[0-9a-f]+}} R_ARM_GOT_PREL target
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#
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# The GOT entry contains the absolute address of the external:
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# jitlink-check: *{4}(got_addr(out.o, target)) = target
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#
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# The embedded offset value contains the offset to the GOT entry relative to pc.
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# The +12 accounts for the ARM branch offset (8) and the .LPC offset (4), which
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# is stored as initial addend inline.
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# FIXME: We shouldn't need to substract the 64-bit sign-extension manually.
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# jitlink-check: *{4}got_prel_offset = got_addr(out.o, target) - (got_prel + 12) - 0xffffffff00000000
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.globl got_prel
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.type got_prel,%function
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.p2align 2
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.code 32
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got_prel:
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ldr r0, .LCPI
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.LPC:
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ldr r0, [pc, r0]
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ldr r0, [r0]
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bx lr
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# Actual relocation site is on the embedded offset value:
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.globl got_prel_offset
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got_prel_offset:
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.LCPI:
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.long target(GOT_PREL)-((.LPC+8)-.LCPI)
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.size got_prel_offset, .-got_prel_offset
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.size got_prel, .-got_prel
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# EH personality routine in .ARM.exidx
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# CHECK-TYPE: {{[0-9a-f]+}} R_ARM_NONE __aeabi_unwind_cpp_pr0
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.globl __aeabi_unwind_cpp_pr0
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.type __aeabi_unwind_cpp_pr0,%function
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.align 2
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__aeabi_unwind_cpp_pr0:
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bx lr
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# CHECK-TYPE: {{[0-9a-f]+}} R_ARM_PREL31 .text
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#
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# An .ARM.exidx table entry is 8-bytes in size, made up of 2 4-byte entries.
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# First word contains offset to function for this entry:
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# jitlink-check: (*{4}section_addr(out.o, .ARM.exidx))[31:0] = prel31 - section_addr(out.o, .ARM.exidx)
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#
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# Most-significant bit in second word denotes inline entry when set (and
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# relocation to .ARM.extab otherwise). Inline entry with compact model index 0:
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# 0x9b vsp = r11
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# 0x84 0x80 pop {r11, r14}
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#
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# jitlink-check: *{4}(section_addr(out.o, .ARM.exidx) + 4) = 0x809b8480
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#
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.globl prel31
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.type prel31,%function
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.align 2
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prel31:
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.fnstart
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.save {r11, lr}
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push {r11, lr}
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.setfp r11, sp
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mov r11, sp
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pop {r11, lr}
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mov pc, lr
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.fnend
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.size prel31,.-prel31
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# This test is executable with any 4-byte external target:
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# > echo "unsigned target = 42;" | clang -target armv7-linux-gnueabihf -o target.o -c -xc -
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# > llvm-jitlink target.o armv7/out.o
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#
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.globl main
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.type main, %function
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.p2align 2
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main:
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push {lr}
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bl got_prel
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bl prel31
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pop {pc}
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.size main, .-main
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