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binfmt_flat: add MMU-specific support 

Not much else to do at this point except for the different stack setups.

Signed-off-by: Nicolas Pitre <nico@linaro.org>
Reviewed-by: Greg Ungerer <gerg@linux-m68k.org>
Signed-off-by: Greg Ungerer <gerg@linux-m68k.org>
This commit is contained in:
Nicolas Pitre 2016-07-24 11:30:25 -04:00 committed by Greg Ungerer
parent af521f92dc
commit 015feacf93
1 changed files with 13 additions and 3 deletions
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16
fs/binfmt_flat.c
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@ -537,7 +537,7 @@ static int load_flat_file(struct linux_binprm *bprm,
* case, and then the fully copied to RAM case which lumps
* it all together.
*/
if ((flags & (FLAT_FLAG_RAM|FLAT_FLAG_GZIP)) == 0) {
if (!IS_ENABLED(CONFIG_MMU) && !(flags & (FLAT_FLAG_RAM|FLAT_FLAG_GZIP))) {
/*
* this should give us a ROM ptr, but if it doesn't we don't
* really care
@ -677,7 +677,9 @@ static int load_flat_file(struct linux_binprm *bprm,
*/
current->mm->start_brk = datapos + data_len + bss_len;
current->mm->brk = (current->mm->start_brk + 3) & ~3;
#ifndef CONFIG_MMU
current->mm->context.end_brk = memp + memp_size - stack_len;
#endif
}
if (flags & FLAT_FLAG_KTRACE) {
@ -870,7 +872,7 @@ static int load_flat_binary(struct linux_binprm *bprm)
{
struct lib_info libinfo;
struct pt_regs *regs = current_pt_regs();
unsigned long stack_len;
unsigned long stack_len = 0;
unsigned long start_addr;
int res;
int i, j;
@ -884,7 +886,9 @@ static int load_flat_binary(struct linux_binprm *bprm)
* pedantic and include space for the argv/envp array as it may have
* a lot of entries.
*/
stack_len = PAGE_SIZE * MAX_ARG_PAGES - bprm->p; /* the strings */
#ifndef CONFIG_MMU
stack_len += PAGE_SIZE * MAX_ARG_PAGES - bprm->p; /* the strings */
#endif
stack_len += (bprm->argc + 1) * sizeof(char *); /* the argv array */
stack_len += (bprm->envc + 1) * sizeof(char *); /* the envp array */
stack_len = ALIGN(stack_len, FLAT_STACK_ALIGN);
@ -912,6 +916,11 @@ static int load_flat_binary(struct linux_binprm *bprm)
set_binfmt(&flat_format);
#ifdef CONFIG_MMU
res = setup_arg_pages(bprm, STACK_TOP, EXSTACK_DEFAULT);
if (!res)
res = create_flat_tables(bprm, bprm->p);
#else
/* Stash our initial stack pointer into the mm structure */
current->mm->start_stack =
((current->mm->context.end_brk + stack_len + 3) & ~3) - 4;
@ -921,6 +930,7 @@ static int load_flat_binary(struct linux_binprm *bprm)
res = transfer_args_to_stack(bprm, &current->mm->start_stack);
if (!res)
res = create_flat_tables(bprm, current->mm->start_stack);
#endif
if (res)
return res;