xref: /llvm-project/lld/test/ELF/arm-thumb2-ldrlit.s (revision 75cdab6dc2453a508157a9c383b93373a93078d6)
1// REQUIRES: arm
2// RUN: llvm-mc --triple=thumbv7m-none-eabi --arm-add-build-attributes -filetype=obj -o %t.o %s
3// RUN: echo "SECTIONS { \
4// RUN:                 .rodata.low 0x8012  : { *(.rodata.low) } \
5// RUN:                 .text.low   0x8f00  : { *(.text.low) } \
6// RUN:                 .text.neg   0x9000  : { *(.text.neg) } \
7// RUN:                 .text.pos   0x10000 : { *(.text.pos) } \
8// RUN:                 .text.high  0x10100 : { *(.text.high) } \
9// RUN:                 .data_high  0x1100f : { *(.data.high) } \
10// RUN:               } " > %t.script
11// RUN: ld.lld --script %t.script %t.o -o %t
12// RUN: llvm-readobj --symbols %t | FileCheck %s --check-prefix=SYMS
13// RUN: llvm-objdump --no-print-imm-hex -d --no-show-raw-insn %t | FileCheck %s
14
15/// Test the various legal cases for the R_ARM_THM_PC12 relocation
16/// Interesting things to note
17/// Range is +- 4095 bytes
18/// The Thumb bit for function symbols is ignored
19/// The expression is S + A - Pa where Pa is AlignDown(PC, 4) so we will use
20/// 2-byte nops to make some of the ldr instructions 2-byte aligned.
21 .section .rodata.low, "a", %progbits
22dat1:
23 .byte 0
24dat2:
25 .byte 1
26dat3:
27 .byte 2
28dat4:
29 .byte 3
30
31 .section .text.low, "ax", %progbits
32 .balign 4
33 .global target1
34 .type target1, %function
35target1:
36 bx lr
37 .type target2, %function
38target2:
39 bx lr
40
41 .section .text.neg, "ax", %progbits
42 .balign 4
43 .global _start
44 .thumb_func
45_start:
46 nop
47/// ldr r0, dat1
48 .inst.w 0xf85f0004
49 .reloc 2, R_ARM_THM_PC12, dat1
50/// ldr r1, dat2
51 .inst.w 0xf85f1004
52 .reloc 6, R_ARM_THM_PC12, dat2
53 nop
54/// ldr r2, dat3
55 .inst.w 0xf85f2004
56 .reloc 0xc, R_ARM_THM_PC12, dat3
57/// ldr r3, dat4
58 .inst.w 0xf85f3004
59 .reloc 0x10, R_ARM_THM_PC12, dat4
60
61/// ldr r0, target1
62 .inst.w 0xf85f0004
63 .reloc 0x14, R_ARM_THM_PC12, target1
64
65 nop
66/// ldr r1, target2
67 .inst.w 0xf85f1004
68 .reloc 0x1a, R_ARM_THM_PC12, target2
69
70 .section .text.pos, "ax", %progbits
71 .balign 4
72 .global pos
73 .thumb_func
74pos:
75/// ldr r2, target3
76 .inst.w 0xf85f2004
77 .reloc 0, R_ARM_THM_PC12, target3
78 nop
79/// ldr r3, target4
80 .inst.w 0xf85f3004
81 .reloc 6, R_ARM_THM_PC12, target4
82 nop
83/// ldr r0, dat5
84 .inst.w 0xf85f0004
85 .reloc 0xc, R_ARM_THM_PC12, dat5
86/// ldr r1, dat6
87 .inst.w 0xf85f1004
88 .reloc 0x10, R_ARM_THM_PC12, dat6
89 nop
90/// ldr r2, dat7
91 .inst.w 0xf85f2004
92 .reloc 0x16, R_ARM_THM_PC12, dat7
93/// ldr r3, dat8
94 .inst.w 0xf85f3004
95 .reloc 0x1a, R_ARM_THM_PC12, dat8
96/// positive addend in instruction, all others are -4 (PC bias)
97///ldr.w r4, dat5 + 8
98 .inst 0xf8df4004
99 .reloc 0x1e, R_ARM_THM_PC12, dat5
100
101 .section .text.high, "ax", %progbits
102 .balign 4
103 .thumb_func
104 .global target3
105target3:
106 bx lr
107 .thumb_func
108target4:
109 bx lr
110
111 .section .data.high, "aw", %progbits
112dat5:
113 .byte 0
114dat6:
115 .byte 1
116dat7:
117 .byte 2
118dat8:
119 .byte 3
120
121// SYMS:     Name: dat1
122// SYMS-NEXT:     Value: 0x8012
123// SYMS:     Name: dat2
124// SYMS-NEXT:     Value: 0x8013
125// SYMS:     Name: dat3
126// SYMS-NEXT:     Value: 0x8014
127// SYMS:     Name: dat4
128// SYMS-NEXT:     Value: 0x8015
129
130// CHECK: 00008f00 <target1>:
131// CHECK-NEXT:     8f00: bx      lr
132// CHECK: 00008f02 <target2>:
133// CHECK-NEXT:     8f02: bx      lr
134
135// CHECK: 00009000 <_start>:
136// CHECK-NEXT:     9000: nop
137/// AlignDown(0x9002+4, 4) - 0xff2 = 0x8012
138// CHECK-NEXT:     9002: ldr.w   r0, [pc, #-4082]
139/// AlignDown(0x9006+4, 4) - 0xff5 = 0x8013
140// CHECK-NEXT:     9006: ldr.w   r1, [pc, #-4085]
141// CHECK-NEXT:     900a: nop
142/// AlignDown(0x900c+4, 4) - 0xffc = 0x8014
143// CHECK-NEXT:     900c: ldr.w   r2, [pc, #-4092]
144/// AlignDown(0x9010+4, 4) - 0xfff = 0x8015
145// CHECK-NEXT:     9010: ldr.w   r3, [pc, #-4095]
146/// AlignDown(0x9014+4, 4) - 0x118 = 0x8f00
147// CHECK-NEXT:     9014: ldr.w   r0, [pc, #-280]
148// CHECK-NEXT:     9018: nop
149/// AlignDown(0x901a+4, 4) - 0x11a = 0x8f02
150// CHECK-NEXT:     901a: ldr.w   r1, [pc, #-282]
151
152// CHECK: 00010000 <pos>:
153/// AlignDown(0x10000+4, 4) + 0x1c = 0x10100
154// CHECK-NEXT:    10000: ldr.w   r2, [pc, #252]
155// CHECK-NEXT:    10004: nop
156/// AlignDown(0x10006+4, 4) + 0x1a = 0x10122
157// CHECK-NEXT:    10006: ldr.w   r3, [pc, #250]
158// CHECK-NEXT:    1000a: nop
159/// AlignDown(0x1000c+4, 4) + 0xfff = 0x1100f
160// CHECK-NEXT:    1000c: ldr.w   r0, [pc, #4095]
161/// AlignDown(0x10010+4, 4) + 0xffc = 0x11010
162// CHECK-NEXT:    10010: ldr.w   r1, [pc, #4092]
163// CHECK-NEXT:    10014: nop
164/// AlignDown(0x10016+4, 4) + 0xff9 = 0x11011
165// CHECK-NEXT:    10016: ldr.w   r2, [pc, #4089]
166/// AlignDown(0x1001a+4, 4) + 0xff6 = 0x11012
167// CHECK-NEXT:    1001a: ldr.w   r3, [pc, #4086]
168/// AlignDown(0x1001e+4, 4) + 0xff7 = 0x11017 = dat5 + 8
169// CHECK-NEXT:    1001e: ldr.w   r4, [pc, #4087]
170
171// CHECK: 00010100 <target3>:
172// CHECK-NEXT:    10100: bx      lr
173
174// CHECK: 00010102 <target4>:
175// CHECK-NEXT:    10102: bx      lr
176
177// SYMS:     Name: dat5
178// SYMS-NEXT:     Value: 0x1100F
179// SYMS:     Name: dat6
180// SYMS-NEXT:     Value: 0x11010
181// SYMS:     Name: dat7
182// SYMS-NEXT:     Value: 0x11011
183// SYMS:     Name: dat8
184// SYMS-NEXT:     Value: 0x11012
185