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binfmt_flat: use generic transfer_args_to_stack() 

This gets rid of the rather ugly, open coded and suboptimal copy code.

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 11:30:19 -04:00 committed by Greg Ungerer
parent 7e7ec6a934
commit 687fd7738e
1 changed files with 10 additions and 12 deletions
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22
fs/binfmt_flat.c
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@ -846,10 +846,8 @@ static int load_flat_binary(struct linux_binprm *bprm)
{
struct lib_info libinfo;
struct pt_regs *regs = current_pt_regs();
unsigned long p = bprm->p;
unsigned long stack_len;
unsigned long sp, stack_len;
unsigned long start_addr;
unsigned long *sp;
int res;
int i, j;
@ -884,15 +882,15 @@ static int load_flat_binary(struct linux_binprm *bprm)
set_binfmt(&flat_format);
p = ((current->mm->context.end_brk + stack_len + 3) & ~3) - 4;
pr_debug("p=%lx\n", p);
sp = ((current->mm->context.end_brk + stack_len + 3) & ~3) - 4;
pr_debug("sp=%lx\n", sp);
/* copy the arg pages onto the stack, this could be more efficient :-) */
for (i = TOP_OF_ARGS - 1; i >= bprm->p; i--)
*(char *) --p =
((char *) page_address(bprm->page[i/PAGE_SIZE]))[i % PAGE_SIZE];
/* copy the arg pages onto the stack */
res = transfer_args_to_stack(bprm, &sp);
if (res)
return res;
sp = (unsigned long *) create_flat_tables(p, bprm);
sp = create_flat_tables(sp, bprm);
/* Fake some return addresses to ensure the call chain will
* initialise library in order for us. We are required to call
@ -904,14 +902,14 @@ static int load_flat_binary(struct linux_binprm *bprm)
for (i = MAX_SHARED_LIBS-1; i > 0; i--) {
if (libinfo.lib_list[i].loaded) {
/* Push previos first to call address */
--sp; put_user(start_addr, sp);
--sp; put_user(start_addr, (unsigned long *)sp);
start_addr = libinfo.lib_list[i].entry;
}
}
#endif
/* Stash our initial stack pointer into the mm structure */
current->mm->start_stack = (unsigned long)sp;
current->mm->start_stack = sp;
#ifdef FLAT_PLAT_INIT
FLAT_PLAT_INIT(regs);