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The %fs register is used by user space TLS - it is CPU dependent, and must

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not be restored from the iframe; it will be set by the scheduling code.
This is only of concern on SMP machines and could prevent TLS from working.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@9310 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Axel Dörfler 2004-10-12 22:42:22 +00:00
parent 2740dedc5b
commit 4609c64d48
1 changed files with 4 additions and 4 deletions
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8
src/kernel/core/arch/x86/arch_interrupts.S
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@ -94,12 +94,12 @@ int_bottom:
movl %eax,%es
movl %ss,%ebx
movl %esp,%esi
cmpl %eax,%ebx // check if we changed the stack
cmpl %eax,%ebx // check if we changed the stack
jne custom_stack
kernel_stack:
call i386_handle_trap
pop %gs
pop %fs
pop %fs // kernel stacks don't care about TLS (which uses %fs)
pop %es
pop %ds
popa
@ -124,7 +124,7 @@ int_bottom:
call i386_handle_trap
lss 84(%esp),%esp // reload custom stack address
pop %gs
pop %fs
addl $4, %esp // we skip %fs, as this contains the CPU dependent TLS segment
pop %es
pop %ds
popa
@ -193,7 +193,7 @@ FUNCTION(i386_restore_frame_from_syscall):
add $4, %esp // make the iframe our current stack position (we don't need the
// return address anymore, as we will use the one of the frame)
pop %gs // recreate the frame environment
pop %fs
addl $4, %esp // we skip %fs, as this contains the CPU dependent TLS segment
pop %es
pop %ds
popa