Linking in .rodata and .debug_frame using arm-none-eabi-gcc
I am trying to link my .o files to generate the ELF to be run on an ARM M0+ bare metal. I am using arm-none-eabi-gcc. If I just have my C file (s) written it links fine and I can run it no problem. (For this I am providing the -lnosys -lc -lm flags to GCC)
However for my purpose I need to 'overwrite' one of the library functions, namely __aeabi_fmul. To do this, I took the disassembly of this function and created a custom file aeabi_fmul.S which I compile separately. Now I need to link this aeabi_fmul.o file with my C source code (so that the final binary will use my implementation of fmul instead of the library's)
It seems to be linking this file in fine (the listing shows that the binary content is identical here), however, if I do an objdump -D there doesn't seem to be any .rodata or ˚ sections in my 'modified' ELF.
This is causing my program to 'randomly' hang while executing a branch instruction, which I'm guessing is linked to these missing sections (because everything else matches 1:1 with the 'working' version)
- Is there something else I need to do to get these two sections to be linked?
- Could the fact that I am linking in my own
__aeabi_fmulbe causing these sections to not get linked?
EDIT:
Dissassembly of working code.
main.elf: file format elf32-littlearm
Disassembly of section .text:
00000000 <hang-0x50>:
0: 40800000 addmi r0, r0, r0
4: 00000053 andeq r0, r0, r3, asr r0
8: 00000051 andeq r0, r0, r1, asr r0
c: 00000051 andeq r0, r0, r1, asr r0
10: 00000051 andeq r0, r0, r1, asr r0
14: 00000051 andeq r0, r0, r1, asr r0
18: 00000051 andeq r0, r0, r1, asr r0
1c: 00000051 andeq r0, r0, r1, asr r0
20: 00000051 andeq r0, r0, r1, asr r0
24: 00000051 andeq r0, r0, r1, asr r0
28: 00000051 andeq r0, r0, r1, asr r0
2c: 00000051 andeq r0, r0, r1, asr r0
30: 00000051 andeq r0, r0, r1, asr r0
34: 00000051 andeq r0, r0, r1, asr r0
38: 00000051 andeq r0, r0, r1, asr r0
3c: 00000051 andeq r0, r0, r1, asr r0
40: 00000051 andeq r0, r0, r1, asr r0
44: 00000051 andeq r0, r0, r1, asr r0
48: 00000051 andeq r0, r0, r1, asr r0
4c: 00000051 andeq r0, r0, r1, asr r0
00000050 <hang>:
50: e7fe b.n 50 <hang>
00000052 <_start>:
52: f000 f89b bl 18c <main>
00000056 <exit>:
56: df01 svc 1
58: e7fe b.n 58 <exit+0x2>
0000005a <putchar>:
5a: b580 push {r7, lr}
5c: af00 add r7, sp, #0
5e: 22e0 movs r2, #224 ; 0xe0
60: 0612 lsls r2, r2, #24
62: 6010 str r0, [r2, #0]
64: 46bd mov sp, r7
66: bd80 pop {r7, pc}
00000068 <PUT32>:
68: 6001 str r1, [r0, #0]
6a: 4770 bx lr
0000006c <GET32>:
6c: 6800 ldr r0, [r0, #0]
6e: 4770 bx lr
00000070 <PUTGETCLR>:
70: 6802 ldr r2, [r0, #0]
72: 438a bics r2, r1
74: 6002 str r2, [r0, #0]
76: 4770 bx lr
00000078 <atest>:
78: 1842 adds r2, r0, r1
7a: 2000 movs r0, #0
7c: d701 bvc.n 82 <atest1>
7e: 2301 movs r3, #1
80: 4318 orrs r0, r3
00000082 <atest1>:
82: d301 bcc.n 88 <atest2>
84: 2302 movs r3, #2
86: 4318 orrs r0, r3
00000088 <atest2>:
88: 4770 bx lr
0000008a <stest>:
8a: 1a42 subs r2, r0, r1
8c: 2000 movs r0, #0
8e: d701 bvc.n 94 <stest1>
90: 2301 movs r3, #1
92: 4318 orrs r0, r3
00000094 <stest1>:
94: d301 bcc.n 9a <stest2>
96: 2302 movs r3, #2
98: 4318 orrs r0, r3
0000009a <stest2>:
9a: 4770 bx lr
0000009c <returnvcflags>:
9c: d703 bvc.n a6 <returnvcflags+0xa>
9e: d306 bcc.n ae <returnvcflags+0x12>
a0: 2003 movs r0, #3
a2: 0700 lsls r0, r0, #28
a4: 4770 bx lr
a6: d305 bcc.n b4 <returnvcflags+0x18>
a8: 2002 movs r0, #2
aa: 0700 lsls r0, r0, #28
ac: 4770 bx lr
ae: 2001 movs r0, #1
b0: 0700 lsls r0, r0, #28
b2: 4770 bx lr
b4: 2000 movs r0, #0
b6: 0700 lsls r0, r0, #28
b8: 4770 bx lr
000000ba <testfun1>:
ba: 2200 movs r2, #0
bc: 41d2 rors r2, r2
be: 4148 adcs r0, r1
c0: e7ec b.n 9c <returnvcflags>
000000c2 <testfun2>:
c2: 2201 movs r2, #1
c4: 41d2 rors r2, r2
c6: 4148 adcs r0, r1
c8: e7e8 b.n 9c <returnvcflags>
000000ca <testfun3>:
ca: 2200 movs r2, #0
cc: 41d2 rors r2, r2
ce: 4188 sbcs r0, r1
d0: e7e4 b.n 9c <returnvcflags>
000000d2 <testfun4>:
d2: 2201 movs r2, #1
d4: 41d2 rors r2, r2
d6: 4188 sbcs r0, r1
d8: e7e0 b.n 9c <returnvcflags>
000000da <PUTGETSET>:
da: 6802 ldr r2, [r0, #0]
dc: 430a orrs r2, r1
de: 6002 str r2, [r0, #0]
e0: 4770 bx lr
...
000000e4 <_fini>:
e4: 46c0 nop ; (mov r8, r8)
e6: 4770 bx lr
000000e8 <__exidx_start>:
e8: 46c0 nop ; (mov r8, r8)
ea: 4770 bx lr
000000ec <__exidx_end>:
ec: 46c0 nop ; (mov r8, r8)
ee: 4770 bx lr
000000f0 <__errno>:
f0: 46c0 nop ; (mov r8, r8)
f2: 4770 bx lr
000000f4 <_isatty>:
f4: 2300 movs r3, #0
f6: 0018 movs r0, r3
f8: 4770 bx lr
fa: 46c0 nop ; (mov r8, r8)
000000fc <_fstat>:
fc: 2300 movs r3, #0
fe: 0018 movs r0, r3
100: 4770 bx lr
102: 46c0 nop ; (mov r8, r8)
00000104 <puts>:
104: b500 push {lr}
106: b085 sub sp, #20
108: 9001 str r0, [sp, #4]
10a: 2300 movs r3, #0
10c: 9303 str r3, [sp, #12]
10e: e009 b.n 124 <puts+0x20>
110: 9b03 ldr r3, [sp, #12]
112: 9a01 ldr r2, [sp, #4]
114: 18d3 adds r3, r2, r3
116: 781b ldrb r3, [r3, #0]
118: 0018 movs r0, r3
11a: f7ff ff9e bl 5a <putchar>
11e: 9b03 ldr r3, [sp, #12]
120: 3301 adds r3, #1
122: 9303 str r3, [sp, #12]
124: 9b03 ldr r3, [sp, #12]
126: 9a01 ldr r2, [sp, #4]
128: 18d3 adds r3, r2, r3
12a: 781b ldrb r3, [r3, #0]
12c: 2b00 cmp r3, #0
12e: d1ef bne.n 110 <puts+0xc>
130: 46c0 nop ; (mov r8, r8)
132: b005 add sp, #20
134: bd00 pop {pc}
136: 46c0 nop ; (mov r8, r8)
00000138 <rand>:
138: 2307 movs r3, #7
13a: 0018 movs r0, r3
13c: 4770 bx lr
13e: 46c0 nop ; (mov r8, r8)
00000140 <srand>:
140: 230b movs r3, #11
142: 0018 movs r0, r3
144: 4770 bx lr
146: 46c0 nop ; (mov r8, r8)
00000148 <_write>:
148: b500 push {lr}
14a: b087 sub sp, #28
14c: 9003 str r0, [sp, #12]
14e: 9102 str r1, [sp, #8]
150: 9201 str r2, [sp, #4]
152: 2300 movs r3, #0
154: 9305 str r3, [sp, #20]
156: e00a b.n 16e <_write+0x26>
158: 9b02 ldr r3, [sp, #8]
15a: 781b ldrb r3, [r3, #0]
15c: 0018 movs r0, r3
15e: f7ff ff7c bl 5a <putchar>
162: 9b02 ldr r3, [sp, #8]
164: 3301 adds r3, #1
166: 9302 str r3, [sp, #8]
168: 9b05 ldr r3, [sp, #20]
16a: 3301 adds r3, #1
16c: 9305 str r3, [sp, #20]
16e: 9a05 ldr r2, [sp, #20]
170: 9b01 ldr r3, [sp, #4]
172: 429a cmp r2, r3
174: dbf0 blt.n 158 <_write+0x10>
176: 9b05 ldr r3, [sp, #20]
178: 0018 movs r0, r3
17a: b007 add sp, #28
17c: bd00 pop {pc}
17e: 46c0 nop ; (mov r8, r8)
00000180 <_close>:
180: 46c0 nop ; (mov r8, r8)
182: 4770 bx lr
00000184 <_read>:
184: 46c0 nop ; (mov r8, r8)
186: 4770 bx lr
00000188 <_lseek>:
188: 46c0 nop ; (mov r8, r8)
18a: 4770 bx lr
0000018c <main>:
18c: b500 push {lr}
18e: b085 sub sp, #20
190: 4b06 ldr r3, [pc, #24] ; (1ac <main+0x20>)
192: 9303 str r3, [sp, #12]
194: 4b06 ldr r3, [pc, #24] ; (1b0 <main+0x24>)
196: 9302 str r3, [sp, #8]
198: 9902 ldr r1, [sp, #8]
19a: 9803 ldr r0, [sp, #12]
19c: f000 f80a bl 1b4 <__aeabi_fmul>
1a0: 1c03 adds r3, r0, #0
1a2: 9301 str r3, [sp, #4]
1a4: 2300 movs r3, #0
1a6: 0018 movs r0, r3
1a8: b005 add sp, #20
1aa: bd00 pop {pc}
1ac: 3fcccccd svccc 0x00cccccd
1b0: 400ccccd andmi ip, ip, sp, asr #25
000001b4 <__aeabi_fmul>:
1b4: b5f0 push {r4, r5, r6, r7, lr}
1b6: 4657 mov r7, sl
1b8: 464e mov r6, r9
1ba: 4645 mov r5, r8
1bc: 0043 lsls r3, r0, #1
1be: b4e0 push {r5, r6, r7}
1c0: 0246 lsls r6, r0, #9
1c2: 4688 mov r8, r1
1c4: 0a76 lsrs r6, r6, #9
1c6: 0e1f lsrs r7, r3, #24
1c8: 0fc4 lsrs r4, r0, #31
1ca: 2f00 cmp r7, #0
1cc: d047 beq.n 25e <__aeabi_fmul+0xaa>
1ce: 2fff cmp r7, #255 ; 0xff
1d0: d025 beq.n 21e <__aeabi_fmul+0x6a>
1d2: 2300 movs r3, #0
1d4: 2580 movs r5, #128 ; 0x80
1d6: 469a mov sl, r3
1d8: 4699 mov r9, r3
1da: 00f6 lsls r6, r6, #3
1dc: 04ed lsls r5, r5, #19
1de: 432e orrs r6, r5
1e0: 3f7f subs r7, #127 ; 0x7f
1e2: 4643 mov r3, r8
1e4: 4642 mov r2, r8
1e6: 025d lsls r5, r3, #9
1e8: 0fd2 lsrs r2, r2, #31
1ea: 005b lsls r3, r3, #1
1ec: 0a6d lsrs r5, r5, #9
1ee: 0e1b lsrs r3, r3, #24
1f0: 4690 mov r8, r2
1f2: d040 beq.n 276 <__aeabi_fmul+0xc2>
1f4: 2bff cmp r3, #255 ; 0xff
1f6: d039 beq.n 26c <__aeabi_fmul+0xb8>
1f8: 2280 movs r2, #128 ; 0x80
1fa: 2000 movs r0, #0
1fc: 00ed lsls r5, r5, #3
1fe: 04d2 lsls r2, r2, #19
200: 4315 orrs r5, r2
202: 3b7f subs r3, #127 ; 0x7f
204: 18fb adds r3, r7, r3
206: 4642 mov r2, r8
208: 4657 mov r7, sl
20a: 1c59 adds r1, r3, #1
20c: 4062 eors r2, r4
20e: 468c mov ip, r1
210: 4307 orrs r7, r0
212: 2f0f cmp r7, #15
214: d85c bhi.n 2d0 <__aeabi_fmul+0x11c>
216: 496f ldr r1, [pc, #444] ; (3d4 <__aeabi_fmul+0x220>)
218: 00bf lsls r7, r7, #2
21a: 59c9 ldr r1, [r1, r7]
21c: 468f mov pc, r1
21e: 2e00 cmp r6, #0
220: d145 bne.n 2ae <__aeabi_fmul+0xfa>
222: 2308 movs r3, #8
224: 469a mov sl, r3
226: 3b06 subs r3, #6
228: 4699 mov r9, r3
22a: e7da b.n 1e2 <__aeabi_fmul+0x2e>
22c: 4642 mov r2, r8
22e: 2802 cmp r0, #2
230: d02d beq.n 28e <__aeabi_fmul+0xda>
232: 2803 cmp r0, #3
234: d100 bne.n 238 <__aeabi_fmul+0x84>
236: e0c3 b.n 3c0 <__aeabi_fmul+0x20c>
238: 2801 cmp r0, #1
23a: d000 beq.n 23e <__aeabi_fmul+0x8a>
23c: e0a2 b.n 384 <__aeabi_fmul+0x1d0>
23e: 2500 movs r5, #0
240: 2600 movs r6, #0
242: 4002 ands r2, r0
244: b2d4 uxtb r4, r2
246: 0276 lsls r6, r6, #9
248: 05ed lsls r5, r5, #23
24a: 0a76 lsrs r6, r6, #9
24c: 432e orrs r6, r5
24e: 07e4 lsls r4, r4, #31
250: 4326 orrs r6, r4
252: 0030 movs r0, r6
254: bc1c pop {r2, r3, r4}
256: 4690 mov r8, r2
258: 4699 mov r9, r3
25a: 46a2 mov sl, r4
25c: bdf0 pop {r4, r5, r6, r7, pc}
25e: 2e00 cmp r6, #0
260: d11a bne.n 298 <__aeabi_fmul+0xe4>
262: 2304 movs r3, #4
264: 469a mov sl, r3
266: 3b03 subs r3, #3
268: 4699 mov r9, r3
26a: e7ba b.n 1e2 <__aeabi_fmul+0x2e>
26c: 002a movs r2, r5
26e: 1e51 subs r1, r2, #1
270: 418a sbcs r2, r1
272: 1c90 adds r0, r2, #2
274: e7c6 b.n 204 <__aeabi_fmul+0x50>
276: 2001 movs r0, #1
278: 2d00 cmp r5, #0
27a: d0c3 beq.n 204 <__aeabi_fmul+0x50>
27c: 0028 movs r0, r5
27e: f000 f8ad bl 3dc <__clzsi2>
282: 1f43 subs r3, r0, #5
284: 3076 adds r0, #118 ; 0x76
286: 409d lsls r5, r3
288: 4243 negs r3, r0
28a: 2000 movs r0, #0
28c: e7ba b.n 204 <__aeabi_fmul+0x50>
28e: 2401 movs r4, #1
290: 25ff movs r5, #255 ; 0xff
292: 4014 ands r4, r2
294: 2600 movs r6, #0
296: e7d6 b.n 246 <__aeabi_fmul+0x92>
298: 0030 movs r0, r6
29a: f000 f89f bl 3dc <__clzsi2>
29e: 1f43 subs r3, r0, #5
2a0: 409e lsls r6, r3
2a2: 2300 movs r3, #0
2a4: 3076 adds r0, #118 ; 0x76
2a6: 4247 negs r7, r0
2a8: 469a mov sl, r3
2aa: 4699 mov r9, r3
2ac: e799 b.n 1e2 <__aeabi_fmul+0x2e>
2ae: 230c movs r3, #12
2b0: 469a mov sl, r3
2b2: 3b09 subs r3, #9
2b4: 4699 mov r9, r3
2b6: e794 b.n 1e2 <__aeabi_fmul+0x2e>
2b8: 2680 movs r6, #128 ; 0x80
2ba: 2400 movs r4, #0
2bc: 03f6 lsls r6, r6, #15
2be: 25ff movs r5, #255 ; 0xff
2c0: e7c1 b.n 246 <__aeabi_fmul+0x92>
2c2: 0035 movs r5, r6
2c4: 4648 mov r0, r9
2c6: e7b2 b.n 22e <__aeabi_fmul+0x7a>
2c8: 0035 movs r5, r6
2ca: 0022 movs r2, r4
2cc: 4648 mov r0, r9
2ce: e7ae b.n 22e <__aeabi_fmul+0x7a>
2d0: 0429 lsls r1, r5, #16
2d2: 0c09 lsrs r1, r1, #16
2d4: 0008 movs r0, r1
2d6: 0c37 lsrs r7, r6, #16
2d8: 0436 lsls r6, r6, #16
2da: 0c36 lsrs r6, r6, #16
2dc: 0c2c lsrs r4, r5, #16
2de: 4379 muls r1, r7
2e0: 4370 muls r0, r6
2e2: 4367 muls r7, r4
2e4: 4374 muls r4, r6
2e6: 0c06 lsrs r6, r0, #16
2e8: 1864 adds r4, r4, r1
2ea: 1936 adds r6, r6, r4
2ec: 42b1 cmp r1, r6
2ee: d903 bls.n 2f8 <__aeabi_fmul+0x144>
2f0: 2180 movs r1, #128 ; 0x80
2f2: 0249 lsls r1, r1, #9
2f4: 4688 mov r8, r1
2f6: 4447 add r7, r8
2f8: 0400 lsls r0, r0, #16
2fa: 0c00 lsrs r0, r0, #16
2fc: 0431 lsls r1, r6, #16
2fe: 1809 adds r1, r1, r0
300: 018d lsls r5, r1, #6
302: 1e68 subs r0, r5, #1
304: 4185 sbcs r5, r0
306: 0e89 lsrs r1, r1, #26
308: 4329 orrs r1, r5
30a: 0c35 lsrs r5, r6, #16
30c: 19ed adds r5, r5, r7
30e: 01ad lsls r5, r5, #6
310: 430d orrs r5, r1
312: 0129 lsls r1, r5, #4
314: d504 bpl.n 320 <__aeabi_fmul+0x16c>
316: 2301 movs r3, #1
318: 0869 lsrs r1, r5, #1
31a: 401d ands r5, r3
31c: 4663 mov r3, ip
31e: 430d orrs r5, r1
320: 0019 movs r1, r3
322: 317f adds r1, #127 ; 0x7f
324: 2900 cmp r1, #0
326: dd25 ble.n 374 <__aeabi_fmul+0x1c0>
328: 0768 lsls r0, r5, #29
32a: d004 beq.n 336 <__aeabi_fmul+0x182>
32c: 200f movs r0, #15
32e: 4028 ands r0, r5
330: 2804 cmp r0, #4
332: d000 beq.n 336 <__aeabi_fmul+0x182>
334: 3504 adds r5, #4
336: 0128 lsls r0, r5, #4
338: d503 bpl.n 342 <__aeabi_fmul+0x18e>
33a: 4927 ldr r1, [pc, #156] ; (3d8 <__aeabi_fmul+0x224>)
33c: 3380 adds r3, #128 ; 0x80
33e: 400d ands r5, r1
340: 0019 movs r1, r3
342: 29fe cmp r1, #254 ; 0xfe
344: dca3 bgt.n 28e <__aeabi_fmul+0xda>
346: 2401 movs r4, #1
348: 01ad lsls r5, r5, #6
34a: 0a6e lsrs r6, r5, #9
34c: 4014 ands r4, r2
34e: b2cd uxtb r5, r1
350: e779 b.n 246 <__aeabi_fmul+0x92>
352: 2080 movs r0, #128 ; 0x80
354: 03c0 lsls r0, r0, #15
356: 4206 tst r6, r0
358: d007 beq.n 36a <__aeabi_fmul+0x1b6>
35a: 4205 tst r5, r0
35c: d105 bne.n 36a <__aeabi_fmul+0x1b6>
35e: 4328 orrs r0, r5
360: 0246 lsls r6, r0, #9
362: 0a76 lsrs r6, r6, #9
364: 4644 mov r4, r8
366: 25ff movs r5, #255 ; 0xff
368: e76d b.n 246 <__aeabi_fmul+0x92>
36a: 4306 orrs r6, r0
36c: 0276 lsls r6, r6, #9
36e: 0a76 lsrs r6, r6, #9
370: 25ff movs r5, #255 ; 0xff
372: e768 b.n 246 <__aeabi_fmul+0x92>
374: 2401 movs r4, #1
376: 1a61 subs r1, r4, r1
378: 291b cmp r1, #27
37a: dd05 ble.n 388 <__aeabi_fmul+0x1d4>
37c: 4014 ands r4, r2
37e: 2500 movs r5, #0
380: 2600 movs r6, #0
382: e760 b.n 246 <__aeabi_fmul+0x92>
384: 4663 mov r3, ip
386: e7cb b.n 320 <__aeabi_fmul+0x16c>
388: 002e movs r6, r5
38a: 2320 movs r3, #32
38c: 40ce lsrs r6, r1
38e: 1a59 subs r1, r3, r1
390: 408d lsls r5, r1
392: 1e6b subs r3, r5, #1
394: 419d sbcs r5, r3
396: 432e orrs r6, r5
398: 0773 lsls r3, r6, #29
39a: d004 beq.n 3a6 <__aeabi_fmul+0x1f2>
39c: 230f movs r3, #15
39e: 4033 ands r3, r6
3a0: 2b04 cmp r3, #4
3a2: d000 beq.n 3a6 <__aeabi_fmul+0x1f2>
3a4: 3604 adds r6, #4
3a6: 0173 lsls r3, r6, #5
3a8: d504 bpl.n 3b4 <__aeabi_fmul+0x200>
3aa: 2401 movs r4, #1
3ac: 2501 movs r5, #1
3ae: 4014 ands r4, r2
3b0: 2600 movs r6, #0
3b2: e748 b.n 246 <__aeabi_fmul+0x92>
3b4: 2401 movs r4, #1
3b6: 01b6 lsls r6, r6, #6
3b8: 0a76 lsrs r6, r6, #9
3ba: 4014 ands r4, r2
3bc: 2500 movs r5, #0
3be: e742 b.n 246 <__aeabi_fmul+0x92>
3c0: 2680 movs r6, #128 ; 0x80
3c2: 2401 movs r4, #1
3c4: 03f6 lsls r6, r6, #15
3c6: 432e orrs r6, r5
3c8: 0276 lsls r6, r6, #9
3ca: 0a76 lsrs r6, r6, #9
3cc: 4014 ands r4, r2
3ce: 25ff movs r5, #255 ; 0xff
3d0: e739 b.n 246 <__aeabi_fmul+0x92>
3d2: 46c0 nop ; (mov r8, r8)
3d4: 00000418 andeq r0, r0, r8, lsl r4
3d8: f7ffffff ; <UNDEFINED> instruction: 0xf7ffffff
000003dc <__clzsi2>:
3dc: 211c movs r1, #28
3de: 2301 movs r3, #1
3e0: 041b lsls r3, r3, #16
3e2: 4298 cmp r0, r3
3e4: d301 bcc.n 3ea <__clzsi2+0xe>
3e6: 0c00 lsrs r0, r0, #16
3e8: 3910 subs r1, #16
3ea: 0a1b lsrs r3, r3, #8
3ec: 4298 cmp r0, r3
3ee: d301 bcc.n 3f4 <__clzsi2+0x18>
3f0: 0a00 lsrs r0, r0, #8
3f2: 3908 subs r1, #8
3f4: 091b lsrs r3, r3, #4
3f6: 4298 cmp r0, r3
3f8: d301 bcc.n 3fe <__clzsi2+0x22>
3fa: 0900 lsrs r0, r0, #4
3fc: 3904 subs r1, #4
3fe: a202 add r2, pc, #8 ; (adr r2, 408 <__clzsi2+0x2c>)
400: 5c10 ldrb r0, [r2, r0]
402: 1840 adds r0, r0, r1
404: 4770 bx lr
406: 46c0 nop ; (mov r8, r8)
408: 02020304 andeq r0, r2, #4, 6 ; 0x10000000
40c: 01010101 tsteq r1, r1, lsl #2
...
Disassembly of section .rodata:
00000418 <.rodata>:
418: 000002d0 ldrdeq r0, [r0], -r0 ; <UNPREDICTABLE>
41c: 0000022e andeq r0, r0, lr, lsr #4
420: 0000022e andeq r0, r0, lr, lsr #4
424: 0000022c andeq r0, r0, ip, lsr #4
428: 000002c2 andeq r0, r0, r2, asr #5
42c: 000002c2 andeq r0, r0, r2, asr #5
430: 000002b8 ; <UNDEFINED> instruction: 0x000002b8
434: 0000022c andeq r0, r0, ip, lsr #4
438: 000002c2 andeq r0, r0, r2, asr #5
43c: 000002b8 ; <UNDEFINED> instruction: 0x000002b8
440: 000002c2 andeq r0, r0, r2, asr #5
444: 0000022c andeq r0, r0, ip, lsr #4
448: 000002c8 andeq r0, r0, r8, asr #5
44c: 000002c8 andeq r0, r0, r8, asr #5
450: 000002c8 andeq r0, r0, r8, asr #5
454: 00000352 andeq r0, r0, r2, asr r3
Disassembly of section .data:
00000458 <heapCurrent>:
458: 40000000 andmi r0, r0, r0
Disassembly of section .ARM.attributes:
00000000 <.ARM.attributes>:
0: 00002d41 andeq r2, r0, r1, asr #26
4: 61656100 cmnvs r5, r0, lsl #2
8: 01006962 tsteq r0, r2, ror #18
c: 00000023 andeq r0, r0, r3, lsr #32
10: 726f4305 rsbvc r4, pc, #335544320 ; 0x14000000
14: 2d786574 cfldr64cs mvdx6, [r8, #-464]! ; 0xfffffe30
18: 002b304d eoreq r3, fp, sp, asr #32
1c: 4d070c06 stcmi 12, cr0, [r7, #-24] ; 0xffffffe8
20: 04120109 ldreq r0, [r2], #-265 ; 0xfffffef7
24: 01150114 tsteq r5, r4, lsl r1
28: 01180317 tsteq r8, r7, lsl r3
2c: Address 0x0000002c is out of bounds.
Disassembly of section .comment:
00000000 <.comment>:
0: 3a434347 bcc 10d0d24 <heapCurrent+0x10d08cc>
4: 4e472820 cdpmi 8, 4, cr2, cr7, cr0, {1}
8: 6f542055 svcvs 0x00542055
c: 20736c6f rsbscs r6, r3, pc, ror #24
10: 20726f66 rsbscs r6, r2, r6, ror #30
14: 204d5241 subcs r5, sp, r1, asr #4
18: 65626d45 strbvs r6, [r2, #-3397]! ; 0xfffff2bb
1c: 64656464 strbtvs r6, [r5], #-1124 ; 0xfffffb9c
20: 6f725020 svcvs 0x00725020
24: 73736563 cmnvc r3, #415236096 ; 0x18c00000
28: 2973726f ldmdbcs r3!, {r0, r1, r2, r3, r5, r6, r9, ip, sp, lr}^
2c: 322e3520 eorcc r3, lr, #32, 10 ; 0x8000000
30: 3220312e eorcc r3, r0, #-2147483637 ; 0x8000000b
34: 31353130 teqcc r5, r0, lsr r1
38: 20323032 eorscs r3, r2, r2, lsr r0
3c: 6c657228 sfmvs f7, 2, [r5], #-160 ; 0xffffff60
40: 65736165 ldrbvs r6, [r3, #-357]! ; 0xfffffe9b
44: 415b2029 cmpmi fp, r9, lsr #32
48: 652f4d52 strvs r4, [pc, #-3410]! ; fffff2fe <_stacktop+0xbf7ff2fe>
4c: 6465626d strbtvs r6, [r5], #-621 ; 0xfffffd93
50: 2d646564 cfstr64cs mvdx6, [r4, #-400]! ; 0xfffffe70
54: 72622d35 rsbvc r2, r2, #3392 ; 0xd40
58: 68636e61 stmdavs r3!, {r0, r5, r6, r9, sl, fp, sp, lr}^
5c: 76657220 strbtvc r7, [r5], -r0, lsr #4
60: 6f697369 svcvs 0x00697369
64: 3332206e teqcc r2, #110 ; 0x6e
68: 38343831 ldmdacc r4!, {r0, r4, r5, fp, ip, sp}
6c: Address 0x0000006c is out of bounds.
Disassembly of section .debug_frame:
00000000 <.debug_frame>:
0: 0000000c andeq r0, r0, ip
4: ffffffff ; <UNDEFINED> instruction: 0xffffffff
8: 7c020001 stcvc 0, cr0, [r2], {1}
c: 000d0c0e andeq r0, sp, lr, lsl #24
10: 00000024 andeq r0, r0, r4, lsr #32
14: 00000000 andeq r0, r0, r0
18: 000001b4 ; <UNDEFINED> instruction: 0x000001b4
1c: 00000228 andeq r0, r0, r8, lsr #4
20: 84140e41 ldrhi r0, [r4], #-3649 ; 0xfffff1bf
24: 86048505 strhi r8, [r4], -r5, lsl #10
28: 8e028703 cdphi 7, 0, cr8, cr2, cr3, {0}
2c: 200e4501 andcs r4, lr, r1, lsl #10
30: 07890888 streq r0, [r9, r8, lsl #17]
34: 0000068a andeq r0, r0, sl, lsl #13
Disassembly of non-working code:
test.elf: file format elf32-littlearm
Disassembly of section .text:
... (all the code from 0x0 to 0x40C are identical. I just created explicit labels within the last two functions to help me with what im trying to do!)
000003fe <twentynine>:
3fe: a202 add r2, pc, #8 ; (adr r2, 408 <twentynine+0xa>)
400: 5c10 ldrb r0, [r2, r0]
402: 1840 adds r0, r0, r1
404: 4770 bx lr
406: 46c0 nop ; (mov r8, r8)
408: 02020304 andeq r0, r2, #4, 6 ; 0x10000000
40c: 01010101 tsteq r1, r1, lsl #2
Disassembly of section .data:
00000410 <heapCurrent>:
410: 40000000 andmi r0, r0, r0
Disassembly of section .ARM.attributes:
00000000 <.ARM.attributes>:
0: 00002d41 andeq r2, r0, r1, asr #26
4: 61656100 cmnvs r5, r0, lsl #2
8: 01006962 tsteq r0, r2, ror #18
c: 00000023 andeq r0, r0, r3, lsr #32
10: 726f4305 rsbvc r4, pc, #335544320 ; 0x14000000
14: 2d786574 cfldr64cs mvdx6, [r8, #-464]! ; 0xfffffe30
18: 002b304d eoreq r3, fp, sp, asr #32
1c: 4d070c06 stcmi 12, cr0, [r7, #-24] ; 0xffffffe8
20: 04120109 ldreq r0, [r2], #-265 ; 0xfffffef7
24: 01150114 tsteq r5, r4, lsl r1
28: 01180317 tsteq r8, r7, lsl r3
2c: Address 0x0000002c is out of bounds.
Disassembly of section .comment:
00000000 <.comment>:
0: 3a434347 bcc 10d0d24 <heapCurrent+0x10d0914>
4: 4e472820 cdpmi 8, 4, cr2, cr7, cr0, {1}
8: 6f542055 svcvs 0x00542055
c: 20736c6f rsbscs r6, r3, pc, ror #24
10: 20726f66 rsbscs r6, r2, r6, ror #30
14: 204d5241 subcs r5, sp, r1, asr #4
18: 65626d45 strbvs r6, [r2, #-3397]! ; 0xfffff2bb
1c: 64656464 strbtvs r6, [r5], #-1124 ; 0xfffffb9c
20: 6f725020 svcvs 0x00725020
24: 73736563 cmnvc r3, #415236096 ; 0x18c00000
28: 2973726f ldmdbcs r3!, {r0, r1, r2, r3, r5, r6, r9, ip, sp, lr}^
2c: 322e3520 eorcc r3, lr, #32, 10 ; 0x8000000
30: 3220312e eorcc r3, r0, #-2147483637 ; 0x8000000b
34: 31353130 teqcc r5, r0, lsr r1
38: 20323032 eorscs r3, r2, r2, lsr r0
3c: 6c657228 sfmvs f7, 2, [r5], #-160 ; 0xffffff60
40: 65736165 ldrbvs r6, [r3, #-357]! ; 0xfffffe9b
44: 415b2029 cmpmi fp, r9, lsr #32
48: 652f4d52 strvs r4, [pc, #-3410]! ; fffff2fe <_stacktop+0xbf7ff2fe>
4c: 6465626d strbtvs r6, [r5], #-621 ; 0xfffffd93
50: 2d646564 cfstr64cs mvdx6, [r4, #-400]! ; 0xfffffe70
54: 72622d35 rsbvc r2, r2, #3392 ; 0xd40
58: 68636e61 stmdavs r3!, {r0, r5, r6, r9, sl, fp, sp, lr}^
5c: 76657220 strbtvc r7, [r5], -r0, lsr #4
60: 6f697369 svcvs 0x00697369
64: 3332206e teqcc r2, #110 ; 0x6e
68: 38343831 ldmdacc r4!, {r0, r4, r5, fp, ip, sp}
6c: Address 0x0000006c is out of bounds.
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