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riscv64: emit .riscv.attributes section in ELF output

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Meng Zhuo 2026-05-07 11:39:41 +08:00
parent 7f764f340f
commit c77339ab41
2 changed files with 26 additions and 1 deletions
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3
elf.h
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@ -2336,7 +2336,8 @@ typedef Elf32_Addr Elf32_Conflict;
/* Processor specific values for the Shdr sh_type field. */
#define SHT_ARM_EXIDX (SHT_LOPROC + 1) /* ARM unwind section. */
#define SHT_ARM_PREEMPTMAP (SHT_LOPROC + 2) /* Preemption details. */
#define SHT_ARM_ATTRIBUTES (SHT_LOPROC + 3) /* ARM attributes section. */
#define SHT_ARM_ATTRIBUTES (SHT_LOPROC + 3) /* ARM attributes section. */
#define SHT_RISCV_ATTRIBUTES 0x70000003
/* AArch64 relocs. */

24
tccelf.c
View File

@ -2852,6 +2852,27 @@ static void create_arm_attribute_section(TCCState *s1)
}
#endif
#ifdef TCC_TARGET_RISCV64
static void create_riscv_attribute_section(TCCState *s1)
{
static const unsigned char riscv_attr[] = {
0x41, /* 'A' */
0x3c, 0x00, 0x00, 0x00, /* total_len = 60 */
'r', 'i', 's', 'c', 'v', 0x00, /* "riscv\0" */
0x2d, 0x00, 0x00, 0x00, /* file_len = 45 */
0x05, /* Tag_RISCV_arch */
0x28, 0x00, 0x00, 0x00, /* isa_len = 40 */
'r','v','6','4','i','2','p','1','_','m','2','p','0','_',
'a','2','p','1','_','f','2','p','2','_','d','2','p','2','_',
'c','2','p','0','_','z','i','c','s','r','2','p','0', 0x00,
};
Section *attr = new_section(s1, ".riscv.attributes", SHT_RISCV_ATTRIBUTES, 0);
unsigned char *ptr = section_ptr_add(attr, sizeof(riscv_attr));
attr->sh_addralign = 1;
memcpy(ptr, riscv_attr, sizeof(riscv_attr));
}
#endif
#if TARGETOS_OpenBSD || TARGETOS_NetBSD || TARGETOS_FreeBSD
static void fill_bsd_note(Section *s, int type,
@ -3112,6 +3133,9 @@ static int elf_output_obj(TCCState *s1, const char *filename)
{
Section *s;
int i, ret, file_offset;
#ifdef TCC_TARGET_RISCV64
create_riscv_attribute_section(s1);
#endif
/* Allocate strings for section names */
alloc_sec_names(s1, 1);
file_offset = (sizeof (ElfW(Ehdr)) + 3) & -4;