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-rw-r--r--masm/asm.c142
1 files changed, 62 insertions, 80 deletions
diff --git a/masm/asm.c b/masm/asm.c
index 0f07079..30628ec 100644
--- a/masm/asm.c
+++ b/masm/asm.c
@@ -6,7 +6,7 @@
#include <elf.h>
#include <string.h>
#include <stddef.h>
-#include <arpa/inet.h>
+#include <melf.h>
#include "asm.h"
#include "mlimits.h"
@@ -30,12 +30,12 @@ static int create_symbol(struct assembler *assembler,
return M_ERROR;
Elf32_Sym symbol = {
- .st_name = htonl(str_off),
- .st_value = htonl(section_offset),
+ .st_name = B32(str_off),
+ .st_value = B32(section_offset),
.st_size = 0,
.st_info = ELF32_ST_INFO(bind, STT_NOTYPE),
.st_other = ELF32_ST_VISIBILITY(STV_DEFAULT),
- .st_shndx = htons(section_idx),
+ .st_shndx = B16(section_idx),
};
// dont put magic flag values inside symbol, only real indexes
@@ -92,6 +92,10 @@ static int handle_directive(struct assembler *assembler,
case MIPS_DIRECTIVE_ALIGN: {
assembler->sectab.current->alignment =
1 << directive->align;
+ if (assembler->sectab.current->alignment == 0) {
+ ERROR("cannot align to zero");
+ return M_ERROR;
+ }
break;
}
@@ -212,7 +216,7 @@ static int handle_label(struct assembler *assembler,
// we need to update it
if (*sec == SYMSEC_STUB) {
*sec = cur->index;
- ref->st_value = htonl(sec_size(cur));
+ ref->st_value = B32(sec_size(cur));
return M_SUCCESS;
}
@@ -242,7 +246,7 @@ static int handle_ins(struct assembler *assembler,
entry.type = ENT_INS;
entry.size = sizeof(union mips_instruction_data);
- entry.ins = htonl(ins->raw);
+ entry.ins = B32(ins->raw);
if (sec_push(sec, entry))
return M_ERROR;
@@ -255,9 +259,9 @@ static int handle_ins(struct assembler *assembler,
return M_ERROR;
Elf32_Rela rel = {
- .r_info = htonl(ELF32_R_INFO(symidx, ref->type)),
- .r_addend = htonl(ref->addend),
- .r_offset = htonl(sec_index(sec, secidx + i)),
+ .r_info = B32(ELF32_R_INFO(symidx, ref->type)),
+ .r_addend = B32(ref->addend),
+ .r_offset = B32(sec_index(sec, secidx + i)),
};
if (reltab_push(&sec->reltab, rel))
@@ -319,17 +323,17 @@ static int assemble_phdr(struct assembler *assembler, Elf32_Phdr **res,
Elf32_Phdr *hdr = &phdr[i];
struct section *sec = &assembler->sectab.sections[i];
size_t size = sec_size(sec);
- hdr->p_type = htonl(PT_LOAD);
- hdr->p_flags = htonl(
+ hdr->p_type = B32(PT_LOAD);
+ hdr->p_flags = B32(
(sec->execute << 0) |
(sec->write << 1) |
(sec->read << 2));
hdr->p_offset = 0;
hdr->p_vaddr = 0;
hdr->p_paddr = 0;
- hdr->p_filesz = htonl(size);
- hdr->p_memsz = htonl(size);
- hdr->p_align = htonl(SEC_ALIGN);
+ hdr->p_filesz = B32(size);
+ hdr->p_memsz = B32(size);
+ hdr->p_align = B32(SEC_ALIGN);
}
*res = phdr;
@@ -376,16 +380,16 @@ static int assemble_shdr(struct assembler *assembler, Elf32_Shdr **res,
sec->reltab_shidx = count;
shdr[count++] = (Elf32_Shdr) {
- .sh_name = htonl(str_off),
- .sh_type = htonl(SHT_RELA),
+ .sh_name = B32(str_off),
+ .sh_type = B32(SHT_RELA),
.sh_flags = 0,
.sh_addr = 0,
.sh_offset = 0,
.sh_size = 0,
.sh_link = 0,
.sh_info = 0,
- .sh_addralign = htonl(1),
- .sh_entsize = htonl(sizeof(Elf32_Rela)),
+ .sh_addralign = B32(1),
+ .sh_entsize = B32(sizeof(Elf32_Rela)),
};
}
@@ -402,12 +406,12 @@ static int assemble_shdr(struct assembler *assembler, Elf32_Shdr **res,
sec->shdr_idx = count;
if (sec->reltab.len != 0)
- shdr[sec->reltab_shidx].sh_info = htonl(count);
+ shdr[sec->reltab_shidx].sh_info = B32(count);
shdr[count++] = (Elf32_Shdr){
- .sh_name = htonl(str_off),
- .sh_type = htonl(SHT_PROGBITS),
- .sh_flags = htonl(
+ .sh_name = B32(str_off),
+ .sh_type = B32(SHT_PROGBITS),
+ .sh_flags = B32(
(sec->write << 0) |
(sec->execute << 2) |
SHF_ALLOC),
@@ -416,7 +420,7 @@ static int assemble_shdr(struct assembler *assembler, Elf32_Shdr **res,
.sh_size = 0,
.sh_link = 0,
.sh_info = 0,
- .sh_addralign = htonl(sec->alignment),
+ .sh_addralign = B32(sec->alignment),
.sh_entsize = 0,
};
}
@@ -429,16 +433,16 @@ static int assemble_shdr(struct assembler *assembler, Elf32_Shdr **res,
assembler->symtab_shidx = count;
shdr[count++] = (Elf32_Shdr) {
- .sh_name = htonl(str_off),
- .sh_type = htonl(SHT_SYMTAB),
+ .sh_name = B32(str_off),
+ .sh_type = B32(SHT_SYMTAB),
.sh_flags = 0,
.sh_addr = 0,
.sh_offset = 0,
.sh_size = 0,
.sh_link = 1,
.sh_info = 0,
- .sh_addralign = htonl(1),
- .sh_entsize = htonl(sizeof(Elf32_Sym)),
+ .sh_addralign = B32(1),
+ .sh_entsize = B32(sizeof(Elf32_Sym)),
};
// string table
@@ -449,15 +453,15 @@ static int assemble_shdr(struct assembler *assembler, Elf32_Shdr **res,
assembler->strtab_shidx = count;
shdr[count++] = (Elf32_Shdr) {
- .sh_name = htonl(str_off),
- .sh_type = htonl(SHT_STRTAB),
- .sh_flags = htonl(SHF_STRINGS),
+ .sh_name = B32(str_off),
+ .sh_type = B32(SHT_STRTAB),
+ .sh_flags = B32(SHF_STRINGS),
.sh_addr = 0,
.sh_offset = 0,
.sh_size = 0,
.sh_link = 0,
.sh_info = 0,
- .sh_addralign = htonl(1),
+ .sh_addralign = B32(1),
.sh_entsize = 0,
};
@@ -469,15 +473,15 @@ static int assemble_shdr(struct assembler *assembler, Elf32_Shdr **res,
assembler->shstrtab_shidx = count;
shdr[count++] = (Elf32_Shdr) {
- .sh_name = htonl(str_off),
- .sh_type = htonl(SHT_STRTAB),
- .sh_flags = htonl(SHF_STRINGS),
+ .sh_name = B32(str_off),
+ .sh_type = B32(SHT_STRTAB),
+ .sh_flags = B32(SHF_STRINGS),
.sh_addr = 0,
.sh_offset = 0,
.sh_size = 0,
.sh_link = 0,
.sh_info = 0,
- .sh_addralign = htonl(1),
+ .sh_addralign = B32(1),
.sh_entsize = 0,
};
@@ -486,7 +490,7 @@ static int assemble_shdr(struct assembler *assembler, Elf32_Shdr **res,
if (sec->reltab.len == 0)
continue;
shdr[sec->reltab_shidx].sh_link =
- htonl(assembler->symtab_shidx);
+ B32(assembler->symtab_shidx);
}
*res = shdr;
@@ -506,7 +510,7 @@ static void update_offsets(struct assembler *assembler, Elf32_Ehdr *ehdr)
ptr += sizeof(Elf32_Ehdr);
// phdr
- ehdr->e_phoff = htonl(ptr);
+ ehdr->e_phoff = B32(ptr);
ptr += assembler->phdr_len * sizeof(Elf32_Phdr);
// reltbls
@@ -516,8 +520,8 @@ static void update_offsets(struct assembler *assembler, Elf32_Ehdr *ehdr)
continue;
int idx = sec->reltab_shidx;
int len = sec->reltab.len;
- shdr[idx].sh_offset = htonl(ptr);
- shdr[idx].sh_size = htonl(len * sizeof(Elf32_Rela));
+ shdr[idx].sh_offset = B32(ptr);
+ shdr[idx].sh_size = B32(len * sizeof(Elf32_Rela));
ptr += len * sizeof(Elf32_Rela);
}
@@ -537,10 +541,10 @@ static void update_offsets(struct assembler *assembler, Elf32_Ehdr *ehdr)
struct section *sec = &assembler->sectab.sections[i];
uint32_t idx = sec->shdr_idx;
uint32_t size = ntohl(phdr[i].p_filesz);
- phdr[i].p_offset = htonl(ptr);
- phdr[i].p_vaddr = htonl(v_addr);
- phdr[i].p_paddr = htonl(v_addr);
- shdr[idx].sh_offset = htonl(ptr);
+ phdr[i].p_offset = B32(ptr);
+ phdr[i].p_vaddr = B32(v_addr);
+ phdr[i].p_paddr = B32(v_addr);
+ shdr[idx].sh_offset = B32(ptr);
shdr[idx].sh_size = phdr[i].p_filesz;
shdr[idx].sh_addr = phdr[i].p_vaddr;
v_addr += size;
@@ -548,25 +552,25 @@ static void update_offsets(struct assembler *assembler, Elf32_Ehdr *ehdr)
}
// symtab
- shdr[assembler->symtab_shidx].sh_offset = htonl(ptr);
- shdr[assembler->symtab_shidx].sh_link = htonl(assembler->strtab_shidx);
+ shdr[assembler->symtab_shidx].sh_offset = B32(ptr);
+ shdr[assembler->symtab_shidx].sh_link = B32(assembler->strtab_shidx);
shdr[assembler->symtab_shidx].sh_size =
- htonl(assembler->symtab.len * sizeof(Elf32_Sym));
+ B32(assembler->symtab.len * sizeof(Elf32_Sym));
ptr += assembler->symtab.len * sizeof(Elf32_Sym);
// strtab
- shdr[assembler->strtab_shidx].sh_offset = htonl(ptr);
- shdr[assembler->strtab_shidx].sh_size = htonl(assembler->strtab.size);
+ shdr[assembler->strtab_shidx].sh_offset = B32(ptr);
+ shdr[assembler->strtab_shidx].sh_size = B32(assembler->strtab.size);
ptr += assembler->strtab.size;
// shstrtab
- shdr[assembler->shstrtab_shidx].sh_offset = htonl(ptr);
+ shdr[assembler->shstrtab_shidx].sh_offset = B32(ptr);
shdr[assembler->shstrtab_shidx].sh_size =
- htonl(assembler->shstrtab.size);
+ B32(assembler->shstrtab.size);
ptr += assembler->shstrtab.size;
// shdr
- ehdr->e_shoff = htonl(ptr);
+ ehdr->e_shoff = B32(ptr);
}
static void update_sym_shindx(struct assembler *assembler)
@@ -576,7 +580,7 @@ static void update_sym_shindx(struct assembler *assembler)
ssize_t sec = assembler->symtab.sections[i];
if (sec >= 0) {
- sym->st_shndx = htons(assembler->
+ sym->st_shndx = B16(assembler->
sectab.sections[sec].shdr_idx);
}
}
@@ -587,7 +591,8 @@ static int write_file(struct assembler *assembler, Elf32_Ehdr *ehdr,
{
FILE *out = fopen(path, "w");
- if (out == NULL) {
+ if (out == NULL)
+ {
ERROR("cannot write '%s'", path);
return M_ERROR;
}
@@ -662,33 +667,10 @@ static int assemble_elf(struct assembler *assembler, const char *out)
return M_ERROR;
};
- Elf32_Ehdr ehdr = {
- .e_ident = {
- [EI_MAG0] = ELFMAG0,
- [EI_MAG1] = ELFMAG1,
- [EI_MAG2] = ELFMAG2,
- [EI_MAG3] = ELFMAG3,
- [EI_CLASS] = ELFCLASS32,
- [EI_DATA] = ELFDATA2MSB,
- [EI_VERSION] = EV_CURRENT,
- [EI_OSABI] = ELFOSABI_NONE,
- [EI_ABIVERSION] = 0x00,
- [EI_PAD] = 0x00,
- },
- .e_type = htons(ET_REL),
- .e_machine = htons(EM_MIPS),
- .e_version = htonl(EV_CURRENT),
- .e_entry = 0x00,
- .e_phoff = 0x00,
- .e_shoff = 0x00,
- .e_flags = htonl(EF_MIPS_ARCH_32R6),
- .e_ehsize = htons(sizeof(Elf32_Ehdr)),
- .e_phentsize = htons(sizeof(Elf32_Phdr)),
- .e_phnum = htons(assembler->phdr_len),
- .e_shentsize = htons(sizeof(Elf32_Shdr)),
- .e_shnum = htons(assembler->shdr_len),
- .e_shstrndx = htons(assembler->shstrtab_shidx),
- };
+ Elf32_Ehdr ehdr = MIPS_ELF_EHDR;
+ ehdr.e_phnum = B16(assembler->phdr_len);
+ ehdr.e_shnum = B16(assembler->shdr_len);
+ ehdr.e_shstrndx = B16(assembler->shstrtab_shidx);
update_offsets(assembler, &ehdr);
update_sym_shindx(assembler);
generated by cgit v1.2.3-freya (git 2.51.0) at 2025-09-21 22:48:42 +0000