riscv-undefined-weak.s
2.38 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
# REQUIRES: riscv
# RUN: llvm-mc -filetype=obj -triple=riscv64 %s -o %t.o
# RUN: llvm-readobj -r %t.o | FileCheck --check-prefix=RELOC %s
# RUN: ld.lld -e absolute %t.o -o %t
# RUN: llvm-objdump -d --no-show-raw-insn %t | FileCheck --check-prefixes=CHECK,PC %s
# RUN: llvm-readelf -x .data %t | FileCheck --check-prefixes=HEX %s
# RUN: ld.lld -e absolute %t.o -o %t --export-dynamic
# RUN: llvm-objdump -d --no-show-raw-insn %t | FileCheck --check-prefixes=CHECK,PLT %s
# RUN: llvm-readelf -x .data %t | FileCheck --check-prefixes=HEX %s
.weak target
.global absolute, relative, branch
## Absolute relocations are resolved to 0.
# RELOC: 0x0 R_RISCV_HI20 target 0x1
# RELOC-NEXT: 0x4 R_RISCV_LO12_I target 0x1
# CHECK-LABEL: <absolute>:
# CHECK-NEXT: lui t0, 0
# CHECK-NEXT: addi t0, t0, 1
absolute:
lui t0, %hi(target+1)
addi t0, t0, %lo(target+1)
## Currently, PC-relative relocations are resolved to 0.
# RELOC-NEXT: 0x8 R_RISCV_PCREL_HI20 target 0x0
# RELOC-NEXT: 0xC R_RISCV_PCREL_LO12_I .Lpcrel_hi0 0x0
# RELOC-NEXT: 0x10 R_RISCV_PCREL_HI20 target 0x2
# RELOC-NEXT: 0x14 R_RISCV_PCREL_LO12_S .Lpcrel_hi1 0x0
## 1048559 should be -0x11.
# CHECK-LABEL: <relative>:
# CHECK-NEXT: 11{{...}}: auipc a1, 1048559
# PC-NEXT: addi a1, a1, -352
# PLT-NEXT: addi a1, a1, -792
# CHECK-LABEL: <.Lpcrel_hi1>:
# CHECK-NEXT: 11{{...}}: auipc t1, 1048559
# PC-NEXT: sd a2, -358(t1)
# PLT-NEXT: sd a2, -798(t1)
relative:
la a1, target
sd a2, target+2, t1
## Branch relocations
## If .dynsym does not exist, an undefined weak symbol is non-preemptible.
## Treat them as PC relative relocations.
# RELOC: 0x18 R_RISCV_CALL target 0x0
# RELOC-NEXT: 0x20 R_RISCV_JAL target 0x0
# PC-LABEL: <branch>:
# PC-NEXT: auipc ra, 1048559
# PC-NEXT: jalr -368(ra)
## FIXME: llvm-objdump -d should print the address, instead of the offset.
# PC-NEXT: j -70008
## If .dynsym exists, an undefined weak symbol is preemptible.
## We create a PLT entry and redirect the reference to it.
# PLT-LABEL: <branch>:
# PLT-NEXT: auipc ra, 0
# PLT-NEXT: jalr 56(ra)
# PLT-NEXT: j -70448
branch:
call target
jal x0, target
## Absolute relocations are resolved to 0.
# RELOC: 0x0 R_RISCV_64 target 0x3
# RELOC-NEXT: 0x8 R_RISCV_32 target 0x4
# HEX: section '.data':
# HEX-NEXT: 03000000 00000000 04000000
.data
.p2align 3
.quad target+3
.long target+4
# PC-NOT: .plt:
# PLT: .plt: