derek.holloway
7502bf64a4
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185 lines
7.9 KiB
ArmAsm
185 lines
7.9 KiB
ArmAsm
; RUN: llvm-mc -triple riscv32-apple-macho -filetype=obj %s -o %t.o
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; RUN: llvm-objdump -dr %t.o | FileCheck %s
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; RUN: llvm-otool -Vtr %t.o | FileCheck %s --check-prefix=OTOOL
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; hi20/low12 offsets of var are relative to the PC at Ltmp0
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; (computed by auipc). Final value in a0:
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;
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; a0 = PC_at_Ltmp0 + hi20_offset(var) + lo12_offset(var)
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;
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; The -0x4 offset of the auipc w.r.t the addi is inlined in the lw
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; instruction.
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;
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; CHECK-LABEL: 00000000 <ltmp0>:
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; CHECK-NEXT: 0: 00000517 auipc a0, 0
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; CHECK-NEXT: 00000000: RISCV_RELOC_HI20(pcrel) var
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; CHECK-NEXT: 4: ffc50513 addi a0, a0, -0x4
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; CHECK-NEXT: 00000004: RISCV_RELOC_LO12(pcrel) var
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Ltmp0:
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auipc a0, %pcrel_hi(var)
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addi a0, a0, %pcrel_lo(Ltmp0)
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; hi20/low12 offsets of var+16 are relative to the PC at Ltmp1
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; (computed by auipc). The relative offset is computed for an
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; additional offset of 16 bytes from var. Final value in a0:
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;
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; a0 = PC_at_Ltmp1 + hi20_offset(var) + lo12_offset(var)
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;
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; The -0x4 offset of the auipc w.r.t the addi is inlined in the lw
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; instruction.
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;
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; CHECK-NEXT: 8: 00000517 auipc a0, 0
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; CHECK-NEXT: 00000008: RISCV_RELOC_ADDEND 0x10
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; CHECK-NEXT: 00000008: RISCV_RELOC_HI20(pcrel) var
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; CHECK-NEXT: c: ffc50513 addi a0, a0, -0x4
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; CHECK-NEXT: 0000000c: RISCV_RELOC_ADDEND 0x10
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; CHECK-NEXT: 0000000c: RISCV_RELOC_LO12(pcrel) var
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Ltmp1:
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auipc a0, %pcrel_hi(var+16)
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addi a0, a0, %pcrel_lo(Ltmp1)
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; This is a GOT-based address loading sequence, used for accessing
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; global variables in shared libraries or position-independent
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; executables (PIE). Uses indirection through the Global Offset
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; Table (GOT).
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;
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; a0 = PC at Ltmp2 + high 20 bits of the offset of GOT entry for var (offset is relative to the PC)
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; auipc a0, %got_pcrel_hi(var)
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; a0 = load from [a0 (computed previously with auipc) + the low 12 bits of offset of the GOT entry for var (relative to PC at Ltmp2)]
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; lw a0, %pcrel_lo(Ltmp2)(a0)
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;
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; The -0x4 offset of the auipc w.r.t the lw is inlined in the lw instruction.
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; CHECK-NEXT: 10: 00000517 auipc a0, 0
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; CHECK-NEXT: 00000010: RISCV_RELOC_GOT_HI20(pcrel) var
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; CHECK-NEXT: 14: ffc52503 lw a0, -0x4(a0)
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; CHECK-NEXT: 00000014: RISCV_RELOC_GOT_LO12(pcrel) var
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Ltmp2:
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auipc a0, %got_pcrel_hi(var)
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lw a0, %pcrel_lo(Ltmp2)(a0)
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; Same as the first example. This time, though, there is code in
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; between the two relocations, which means that the low 12 bits
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; needs to be shifted by the correct amount that takes the address
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; computation relative to the PC at auipc (8 bytes before).
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;
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; CHECK-NEXT: 18: 00000517 auipc a0, 0
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; CHECK-NEXT: 00000018: RISCV_RELOC_HI20(pcrel) var
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; CHECK-NEXT: 1c: 00000013 nop
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; CHECK-NEXT: 20: ff850513 addi a0, a0, -0x8
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; CHECK-NEXT: 00000020: RISCV_RELOC_LO12(pcrel) var
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Ltmp3:
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auipc a0, %pcrel_hi(var)
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nop
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addi a0, a0, %pcrel_lo(Ltmp3)
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; Relocations for function calls. The jal instruction is patched
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; with the relative offset of _bar to the PC (limited to 21 bits)
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; CHECK-NEXT: [[PC_call:[0-9a-f]+]]:{{.*}}jal 0x[[PC_call]] <ltmp0+0x[[PC_call]]>
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; CHECK-NEXT: RISCV_RELOC_BRANCH21 _bar
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call _bar
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; CHECK-NEXT: [[PC_tail:[0-9a-f]+]]:{{.*}}j 0x[[PC_tail]] <ltmp0+0x[[PC_tail]]>
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; CHECK-NEXT: RISCV_RELOC_BRANCH21 _bar
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tail _bar
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; Non PIC/PIE code, used for baremetal, where absolute addresses are
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; expected.
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;
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; a0 = (address_of_var[31:12] << 12) & 0xfffff000
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; a0 = a0 + address_of_var[11:0] = address_of_var
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;
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; CHECK-NEXT: 2c: 00000537 lui a0, 0
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; CHECK-NEXT: 0000002c: RISCV_RELOC_HI20 _var
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; CHECK-NEXT: 30: 00050513 mv a0, a0
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; CHECK-NEXT: 00000030: RISCV_RELOC_LO12 _var
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lui a0, %hi(_var)
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addi a0, a0, %lo(_var)
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; Data directives inside .text, with relocation checks:
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;
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.data_region
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; Absolute address. The linker will fill PC 32 and 34 with the 4
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; bytes of the address of _bar.
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;
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; CHECK-NEXT: 34: 0000 <unknown>
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; CHECK-NEXT: 00000034: RISCV_RELOC_UNSIGNED _bar
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; CHECK-NEXT: 36: 0000 <unknown>
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.word _bar
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; Absolute address as before, but with an additional 42 bytes
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; offset. The linker will see the offset stored @PC36 and use it as
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; an addend to the address of _bar. The resulting value will be
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; stored in the PCs at 36 and 38.
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;
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; CHECK-NEXT: 38: 002a <unknown>
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; CHECK-NEXT: 00000038: RISCV_RELOC_UNSIGNED _bar
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; CHECK-NEXT: 3a: 0000 <unknown>
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.word _bar + 42
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; Subtraction expression. The 4 bytes at PCs 3a and 3c will be
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; replaced with the subtraction of the address of _a and the
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; address of _b.
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;
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; CHECK-NEXT: 3c: 0000 <unknown>
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; CHECK-NEXT: 0000003c: RISCV_RELOC_SUBTRACTOR _b
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; CHECK-NEXT: 0000003c: RISCV_RELOC_UNSIGNED _a
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; CHECK-NEXT: 3e: 0000 <unknown>
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.word _a - _b
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; Same as before, but the offset between _a and _b is shifted by 42
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; bytes. The shift amount is stored in the 2 bytes at 3e.
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;
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; CHECK-NEXT: 40: 002a <unknown>
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; CHECK-NEXT: 00000040: RISCV_RELOC_SUBTRACTOR _b
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; CHECK-NEXT: 00000040: RISCV_RELOC_UNSIGNED _a
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; CHECK-NEXT: 42: 0000 <unknown>
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.word _a - _b + 42
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.end_data_region
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; No more relocation directive past this line.
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; CHECK-NOT: {{.}}
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; OTOOL-LABEL: Relocation information (__TEXT,__text) 20 entries
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; OTOOL-NEXT: address pcrel length extern type scattered symbolnum/value
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; OTOOL-NEXT: 00000040 False long True 1 False _b
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; OTOOL-NEXT: 00000040 False long True 0 False _a
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; OTOOL-NEXT: 0000003c False long True 1 False _b
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; OTOOL-NEXT: 0000003c False long True 0 False _a
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; OTOOL-NEXT: 00000038 False long True 0 False _bar
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; OTOOL-NEXT: 00000034 False long True 0 False _bar
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; OTOOL-NEXT: 00000030 False long True 4 False _var
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; OTOOL-NEXT: 0000002c False long True 3 False _var
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; OTOOL-NEXT: 00000028 True long True 2 False _bar
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; OTOOL-NEXT: 00000024 True long True 2 False _bar
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; OTOOL-NEXT: 00000020 True long True 4 False var
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; OTOOL-NEXT: 00000018 True long True 3 False var
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; OTOOL-NEXT: 00000014 True long True 6 False var
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; OTOOL-NEXT: 00000010 True long True 5 False var
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; OTOOL-NEXT: 0000000c False long False 8 False addend = 0x000010
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; OTOOL-NEXT: 0000000c True long True 4 False var
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; OTOOL-NEXT: 00000008 False long False 8 False addend = 0x000010
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; OTOOL-NEXT: 00000008 True long True 3 False var
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; OTOOL-NEXT: 00000004 True long True 4 False var
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; OTOOL-NEXT: 00000000 True long True 3 False var
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; OTOOL-NEXT: Contents of (__TEXT,__text) section
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; OTOOL-NEXT: 00000000 auipc a0, 0x0
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; OTOOL-NEXT: 00000004 addi a0, a0, -0x4
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; OTOOL-NEXT: 00000008 auipc a0, 0x0
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; OTOOL-NEXT: 0000000c addi a0, a0, -0x4
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; OTOOL-NEXT: 00000010 auipc a0, 0x0
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; OTOOL-NEXT: 00000014 lw a0, -0x4(a0)
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; OTOOL-NEXT: 00000018 auipc a0, 0x0
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; OTOOL-NEXT: 0000001c nop
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; OTOOL-NEXT: 00000020 addi a0, a0, -0x8
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; OTOOL-NEXT: 00000024 jal 0x0
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; OTOOL-NEXT: 00000028 j 0x0
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; OTOOL-NEXT: 0000002c lui a0, 0x0
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; OTOOL-NEXT: 00000030 mv a0, a0
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; OTOOL-NEXT: .long 0 @ KIND_DATA
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; OTOOL-NEXT: .long 42 @ KIND_DATA
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; OTOOL-NEXT: .long 0 @ KIND_DATA
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; OTOOL-NEXT: .long 42 @ KIND_DATA
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; OTOOL-NOT: {{.}}
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