From: Warner Losh <i...@bsdimp.com>
Reduce the number of ifdefs by always calling the swapping routine, but
making them empty when swapping isn't needed.
Signed-off-by: Warner Losh <i...@bsdimp.com>
Reviewed-by: Richard Henderson <richard.hender...@linaro.org>
---
bsd-user/elfload.c | 97 ++++++++++++++++++++++------------------------
1 file changed, 47 insertions(+), 50 deletions(-)
diff --git a/bsd-user/elfload.c b/bsd-user/elfload.c
index 4f3fa83c2c..ccb1744800 100644
--- a/bsd-user/elfload.c
+++ b/bsd-user/elfload.c
@@ -67,13 +67,13 @@
static inline void memcpy_fromfs(void *to, const void *from, unsigned long n)
{
- memcpy(to, from, n);
+ memcpy(to, from, n);
}
#ifdef BSWAP_NEEDED
static void bswap_ehdr(struct elfhdr *ehdr)
{
- bswap16s(&ehdr->e_type); /* Object file type */
+ bswap16s(&ehdr->e_type); /* Object file type */
bswap16s(&ehdr->e_machine); /* Architecture */
bswap32s(&ehdr->e_version); /* Object file version */
bswaptls(&ehdr->e_entry); /* Entry point virtual address */
@@ -81,37 +81,45 @@ static void bswap_ehdr(struct elfhdr *ehdr)
bswaptls(&ehdr->e_shoff); /* Section header table file offset */
bswap32s(&ehdr->e_flags); /* Processor-specific flags */
bswap16s(&ehdr->e_ehsize); /* ELF header size in bytes */
- bswap16s(&ehdr->e_phentsize); /* Program header table entry
size */
+ bswap16s(&ehdr->e_phentsize); /* Program header table entry size */
bswap16s(&ehdr->e_phnum); /* Program header table entry count */
- bswap16s(&ehdr->e_shentsize); /* Section header table entry
size */
+ bswap16s(&ehdr->e_shentsize); /* Section header table entry size */
bswap16s(&ehdr->e_shnum); /* Section header table entry count */
- bswap16s(&ehdr->e_shstrndx); /* Section header string table
index */
+ bswap16s(&ehdr->e_shstrndx); /* Section header string table index */
}
-static void bswap_phdr(struct elf_phdr *phdr)
+static void bswap_phdr(struct elf_phdr *phdr, int phnum)
{
- bswap32s(&phdr->p_type); /* Segment type */
- bswaptls(&phdr->p_offset); /* Segment file offset */
- bswaptls(&phdr->p_vaddr); /* Segment virtual address */
- bswaptls(&phdr->p_paddr); /* Segment physical address */
- bswaptls(&phdr->p_filesz); /* Segment size in file */
- bswaptls(&phdr->p_memsz); /* Segment size in memory */
- bswap32s(&phdr->p_flags); /* Segment flags */
- bswaptls(&phdr->p_align); /* Segment alignment */
+ int i;
+
+ for (i = 0; i < phnum; i++, phdr++) {
+ bswap32s(&phdr->p_type); /* Segment type */
+ bswap32s(&phdr->p_flags); /* Segment flags */
+ bswaptls(&phdr->p_offset); /* Segment file offset */
+ bswaptls(&phdr->p_vaddr); /* Segment virtual address */
+ bswaptls(&phdr->p_paddr); /* Segment physical address */
+ bswaptls(&phdr->p_filesz); /* Segment size in file */
+ bswaptls(&phdr->p_memsz); /* Segment size in memory */
+ bswaptls(&phdr->p_align); /* Segment alignment */
+ }
}
-static void bswap_shdr(struct elf_shdr *shdr)
+static void bswap_shdr(struct elf_shdr *shdr, int shnum)
{
- bswap32s(&shdr->sh_name);
- bswap32s(&shdr->sh_type);
- bswaptls(&shdr->sh_flags);
- bswaptls(&shdr->sh_addr);
- bswaptls(&shdr->sh_offset);
- bswaptls(&shdr->sh_size);
- bswap32s(&shdr->sh_link);
- bswap32s(&shdr->sh_info);
- bswaptls(&shdr->sh_addralign);
- bswaptls(&shdr->sh_entsize);
+ int i;
+
+ for (i = 0; i < shnum; i++, shdr++) {
+ bswap32s(&shdr->sh_name);
+ bswap32s(&shdr->sh_type);
+ bswaptls(&shdr->sh_flags);
+ bswaptls(&shdr->sh_addr);
+ bswaptls(&shdr->sh_offset);
+ bswaptls(&shdr->sh_size);
+ bswap32s(&shdr->sh_link);
+ bswap32s(&shdr->sh_info);
+ bswaptls(&shdr->sh_addralign);
+ bswaptls(&shdr->sh_entsize);
+ }
}
static void bswap_sym(struct elf_sym *sym)
@@ -121,7 +129,15 @@ static void bswap_sym(struct elf_sym *sym)
bswaptls(&sym->st_size);
bswap16s(&sym->st_shndx);
}
-#endif
+
+#else /* ! BSWAP_NEEDED */
+
+static void bswap_ehdr(struct elfhdr *ehdr) { }
+static void bswap_phdr(struct elf_phdr *phdr, int phnum) { }
+static void bswap_shdr(struct elf_shdr *shdr, int shnum) { }
+static void bswap_sym(struct elf_sym *sym) { }
+
+#endif /* ! BSWAP_NEEDED */
/*
* 'copy_elf_strings()' copies argument/envelope strings from user
@@ -367,9 +383,7 @@ static abi_ulong load_elf_interp(struct elfhdr
*interp_elf_ex,
last_bss = 0;
error = 0;
-#ifdef BSWAP_NEEDED
bswap_ehdr(interp_elf_ex);
-#endif
/* First of all, some simple consistency checks */
if ((interp_elf_ex->e_type != ET_EXEC &&
interp_elf_ex->e_type != ET_DYN) ||
@@ -410,12 +424,7 @@ static abi_ulong load_elf_interp(struct elfhdr
*interp_elf_ex,
free(elf_phdata);
return retval;
}
-#ifdef BSWAP_NEEDED
- eppnt = elf_phdata;
- for (i = 0; i<interp_elf_ex->e_phnum; i++, eppnt++) {
- bswap_phdr(eppnt);
- }
-#endif
+ bswap_phdr(elf_phdata, interp_elf_ex->e_phnum);
if (interp_elf_ex->e_type == ET_DYN) {
/* in order to avoid hardcoding the interpreter load
@@ -560,9 +569,7 @@ static void load_symbols(struct elfhdr *hdr, int fd)
for (i = 0; i < hdr->e_shnum; i++) {
if (read(fd, &sechdr, sizeof(sechdr)) != sizeof(sechdr))
return;
-#ifdef BSWAP_NEEDED
- bswap_shdr(&sechdr);
-#endif
+ bswap_shdr(&sechdr, 1);
if (sechdr.sh_type == SHT_SYMTAB) {
symtab = sechdr;
lseek(fd, hdr->e_shoff
@@ -570,9 +577,7 @@ static void load_symbols(struct elfhdr *hdr, int fd)
if (read(fd, &strtab, sizeof(strtab))
!= sizeof(strtab))
return;
-#ifdef BSWAP_NEEDED
- bswap_shdr(&strtab);
-#endif
+ bswap_shdr(&strtab, 1);
goto found;
}
}
@@ -605,9 +610,7 @@ static void load_symbols(struct elfhdr *hdr, int fd)
i = 0;
while (i < nsyms) {
-#ifdef BSWAP_NEEDED
bswap_sym(syms + i);
-#endif
// Throw away entries which we do not need.
if (syms[i].st_shndx == SHN_UNDEF ||
syms[i].st_shndx >= SHN_LORESERVE ||
@@ -679,9 +682,7 @@ int load_elf_binary(struct bsd_binprm *bprm, struct
target_pt_regs *regs,
load_addr = 0;
load_bias = 0;
elf_ex = *((struct elfhdr *) bprm->buf); /* exec-header */
-#ifdef BSWAP_NEEDED
bswap_ehdr(&elf_ex);
-#endif
/* First of all, some simple consistency checks */
if ((elf_ex.e_type != ET_EXEC && elf_ex.e_type != ET_DYN) ||
@@ -715,12 +716,8 @@ int load_elf_binary(struct bsd_binprm *bprm, struct
target_pt_regs *regs,
return -errno;
}
-#ifdef BSWAP_NEEDED
- elf_ppnt = elf_phdata;
- for (i = 0; i < elf_ex.e_phnum; i++, elf_ppnt++) {
- bswap_phdr(elf_ppnt);
- }
-#endif
+ bswap_phdr(elf_phdata, elf_ex.e_phnum);
+
elf_ppnt = elf_phdata;
elf_bss = 0;
--
2.32.0
