https://sourceware.org/bugzilla/show_bug.cgi?id=33159
Bug ID: 33159
Summary: RISC-V:Output Section LMA Alignment
Product: binutils
Version: 2.46 (HEAD)
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: ld
Assignee: unassigned at sourceware dot org
Reporter: bigmagicreadsun at gmail dot com
Target Milestone: ---
During the linking phase, the linker fails to properly align the LMA according
to section alignment rules (ALIGN). Here is my test case:
/* test.S */
.section .text, "ax", @progbits
.align 6
.global _func1
_func1:
li a0, 0x1234
jal _func2
jal _func3
j .
.section .text2, "ax", @progbits
.align 6
.global _func2
_func2:
jal _func3
j .
.section .text3, "ax", @progbits
.align 6
.global _func3
_func3:
.word 0x1111
.word 0x2222
.word 0x3333
.word 0x4444
.word 0x5555
.word 0x6666
.word 0x7777
j .
Linker script:
/* linker.ld */
OUTPUT_ARCH("riscv")
ENTRY(_func1)
MEMORY {
ROM (rxa!w) : ORIGIN = 0x100000, LENGTH = 64K
RAM (rxa!w) : ORIGIN = 0x200000, LENGTH = 64K
}
SECTIONS {
.text : {
*(.text)
} >RAM AT>ROM
.text2 : {
*(.text2)
} >RAM AT>ROM
.text3 : {
*(.text3)
} >RAM AT>ROM
_text_lma = LOADADDR(.text);
_text2_lma = LOADADDR(.text2);
_text3_lma = LOADADDR(.text3);
}
Compilation command:
riscv64-unknown-elf-clang -O0 -march=rv32imac -mabi=ilp32 -T linker.ld test.S
-nostartfiles
Resulting ELF section information from:
riscv64-unknown-elf-objdump -h a.out
a.out: file format elf32-littleriscv
Sections:
Idx Name Size VMA LMA File off Algn
0 .text 00000042 00200000 00100000 00001000 2**6
CONTENTS, ALLOC, LOAD, READONLY, CODE
1 .text2 00000042 00200080 00100042 00001080 2**6
CONTENTS, ALLOC, LOAD, READONLY, CODE
2 .text3 00000042 00200100 00100084 00001100 2**6
CONTENTS, ALLOC, LOAD, READONLY, CODE
3 .riscv.attributes 0000004c 00000000 00000000 00001142 2**0
CONTENTS, READONLY
It can be observed that the LMA is not properly aligned, and this behavior
significantly differs from what clang produces. Here are the clang compilation
results for comparison:
a.out: file format elf32-littleriscv
Sections:
Idx Name Size VMA LMA File off Algn
0 .text 00000010 00200000 00100000 00001000 2**6
CONTENTS, ALLOC, LOAD, READONLY, CODE
1 .text2 00000006 00200040 00100040 00001040 2**6
CONTENTS, ALLOC, LOAD, READONLY, CODE
2 .text3 0000001e 00200080 00100080 00001080 2**6
CONTENTS, ALLOC, LOAD, READONLY, CODE
3 .riscv.attributes 00000032 00000000 00000000 0000109e 2**0
CONTENTS, READONLY
4 .comment 00000079 00000000 00000000 000010d0 2**0
CONTENTS, READONLY
I would like to confirm whether this design behavior is
intentional/enhancement-or-bug?
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