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mapi: Clean up entry_patch_public for x86 tls

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Remove hard coded 16 and use entry_generate_or_patch to patch
public stubs. The generated code actually is sightly tighter
than before since the "nop" instructions before the final "jmp"
get removed.

Reviewed-by: Matt Turner <mattst88@gmail.com>
Signed-off-by: Lepton Wu <lepton@chromium.org>
This commit is contained in:
Lepton Wu 2019-10-25 17:27:04 -07:00 • committed by Matt Turner
parent 1fb75bee90
commit b2b8639d8e
1 changed files with 7 additions and 10 deletions
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17
src/mapi/entry_x86_tls.h
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@ -33,6 +33,8 @@
#define HIDDEN
#endif
#define X86_ENTRY_SIZE 16
__asm__(".text");
__asm__("x86_current_tls:\n\t"
@ -87,23 +89,18 @@ void
entry_patch_public(void)
{
#ifndef GLX_X86_READONLY_TEXT
char patch[8] = {
0x65, 0xa1, 0x00, 0x00, 0x00, 0x00, /* movl %gs:0x0, %eax */
0x90, 0x90 /* nop's */
};
char *entry;
*((unsigned long *) (patch + 2)) = x86_current_tls();
for (entry = x86_entry_start; entry < x86_entry_end; entry += 16)
memcpy(entry, patch, sizeof(patch));
int slot = 0;
for (entry = x86_entry_start; entry < x86_entry_end;
entry += X86_ENTRY_SIZE, ++slot)
entry_generate_or_patch(slot, entry, X86_ENTRY_SIZE);
#endif
}
mapi_func
entry_get_public(int slot)
{
return (mapi_func) (x86_entry_start + slot * 16);
return (mapi_func) (x86_entry_start + slot * X86_ENTRY_SIZE);
}
void