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Cooments to warn not to use certains instructions

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- gas2ack cannot handle all variants of some instructions. Until this issues is
  addressed, this patch places a big warning where appropriate. This code is not
  supposed to change frequently.
This commit is contained in:
Tomas Hruby 2009-12-07 12:01:05 +00:00
parent 45a52f7acc
commit 51065a1b47
2 changed files with 14 additions and 0 deletions
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8
kernel/arch/i386/klib386.S
View file

@ -549,12 +549,16 @@ fninit:
fnstsw:
xor %eax, %eax
/* DO NOT CHANGE THE OPERAND!!! gas2ack does not handle it yet */
fnstsw %ax
ret
fnstcw:
push %eax
mov 8(%esp), %eax
/* DO NOT CHANGE THE OPERAND!!! gas2ack does not handle it yet */
fnstcw (%eax)
pop %eax
ret
@ -599,6 +603,8 @@ read_cr2:
read_cr4:
push %ebp
mov %esp, %ebp
/* DO NOT CHANGE THE OPERAND!!! gas2ack does not handle it yet */
mov %cr4, %eax
pop %ebp
ret
@ -611,6 +617,8 @@ write_cr4:
push %ebp
mov %esp, %ebp
mov 8(%ebp), %eax
/* DO NOT CHANGE THE OPERAND!!! gas2ack does not handle it yet */
mov %eax, %cr4
jmp 0f
0:

6
kernel/arch/i386/mpx386.S
View file

@ -542,9 +542,12 @@ copr_not_available:
mov %ss:FP_SAVE_AREA_P(%ebp), %eax
cmp $0, osfxsr_feature
jz fp_l_no_fxsr /* FXSR is not avaible. */
/* DO NOT CHANGE THE OPERAND!!! gas2ack does not handle it yet */
fxrstor (%eax)
jmp copr_return
fp_l_no_fxsr:
/* DO NOT CHANGE THE OPERAND!!! gas2ack does not handle it yet */
frstor (%eax)
copr_return:
orw $MF_USED_FPU, (%ebx) /* fpu was used during last execution */
@ -612,10 +615,13 @@ lazy_fpu:
mov %ss:FP_SAVE_AREA_P(%eax), %eax
cmp $0, osfxsr_feature
jz fp_s_no_fxsr /* FXSR is not avaible. */
/* DO NOT CHANGE THE OPERAND!!! gas2ack does not handle it yet */
fxsave (%eax)
fninit
jmp fp_saved
fp_s_no_fxsr:
/* DO NOT CHANGE THE OPERAND!!! gas2ack does not handle it yet */
fnsave (%eax)
fwait /* required for compatibility with processors prior pentium */
fp_saved: