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allow i386 __set_thread_area to be called more than once

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previously a new GDT slot was requested, even if one had already been
obtained by a previous call. instead extract the old slot number from
GS and reuse it if it was already set. the formula (GS-3)/8 for the
slot number automatically yields -1 (request for new slot) if GS is
zero (unset).
This commit is contained in:
Rich Felker 2015-04-13 17:26:08 -04:00
parent f3ddd17380
commit f630df09b1
1 changed files with 5 additions and 1 deletions
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6
src/thread/i386/__set_thread_area.s
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@ -6,7 +6,11 @@ __set_thread_area:
push $0x51
push $0xfffff
push 16(%esp)
push $-1
xor %edx,%edx
mov %gs,%dx
sub $3,%edx
sar $3,%edx
push %edx
mov %esp,%ebx
xor %eax,%eax
mov $243,%al