https://sourceware.org/bugzilla/show_bug.cgi?id=19157
Bug ID: 19157
Summary: GNURL78 "Objdump": Incorrect disassembler output
generated by objdump for base addressing using SP
register.
Product: binutils
Version: 2.25
Status: NEW
Severity: critical
Priority: P2
Component: binutils
Assignee: unassigned at sourceware dot org
Reporter: vinay.g at kpit dot com
Target Milestone: ---
Description of the problem :
The GNURL78 objdump utility generated incorrect
output for base addressing using stack pointer (SP) register.
// testcase test.s
.text
mov a, [sp]
mov a, [sp + 0]
mov a, [sp + 1]
movw ax, [sp]
movw ax, [sp + 0]
movw ax, [sp + 2]
mov [sp], # 9
mov [sp + 0], # 9
mov [sp + 1], # 9
.end
Command:
$rl78-elf-as test.s -o test.o -aln
$rl78-elf-objdump -d test.o
List file output :
1 .text
2 0000 88 00 mov a, [sp]
3 0002 88 00 mov a, [sp + 0]
4 0004 88 01 mov a, [sp + 1]
8 000c A8 00 movw ax, [sp]
9 000e A8 00 movw ax, [sp + 0]
10 0010 A8 02 movw ax, [sp + 2]
14 0018 C8 00 09 mov [sp], # 9
15 001b C8 00 09 mov [sp + 0], # 9
16 001e C8 01 09 mov [sp + 1], # 9
17 .end
Actual objdump disassembly output:
Disassembly of section .text:
00000000 <.text>:
0: 88 00 mov a, [sp]
2: 88 00 mov a, [sp]
4: 88 01 mov a, [sp+1]
c: a8 00 movw ax, [sp]
e: a8 00 movw ax, [sp]
10: a8 02 movw ax, [sp+2]
18: c8 00 09 mov [sp], #9
1b: c8 00 09 mov [sp], #9
1e: c8 01 09 mov [sp+1], #9
Expected objdump disassembly output :
00000000 <.text>:
0: 88 00 mov a, [sp+0]
2: 88 00 mov a, [sp+0]
4: 88 01 mov a, [sp+1]
c: a8 00 movw ax, [sp+0]
e: a8 00 movw ax, [sp+0]
10: a8 02 movw ax, [sp+2]
18: c8 00 09 mov [sp+0], #9
1b: c8 00 09 mov [sp+0], #9
1e: c8 01 09 mov [sp+1], #9
For example,
the instruction "mov a, [sp + 0]" was disassembled as "mov a, [sp]", here "+0"
was omitted.
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