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Code Issues Releases Activity

Save FPU context for i386.

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This commit is contained in:
Konstantin Belousov 2010-04-17 00:18:33 +03:00
parent b1c68e060c
commit 75b76d1f45
1 changed files with 25 additions and 9 deletions
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34
src/x86/getcontext-freebsd.S
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@ -61,20 +61,36 @@ _Ux86_getcontext:
popl FREEBSD_UC_MCONTEXT_EFLAGS_OFF(%eax)
movl $0, FREEBSD_UC_MCONTEXT_TRAPNO_OFF(%eax)
#if 0
movl $FREEBSD_UC_MCONTEXT_FPOWNED_FPU,\
FREEBSD_UC_MCONTEXT_OWNEDFP_OFF(%eax)
movl $FREEBSD_UC_MCONTEXT_FPFMT_XMM,\
FREEBSD_UC_MCONTEXT_FPFORMAT_OFF(%eax)
/* Require CPU with fxsave implemented, and enabled by OS. */
fxsave FREEBSD_UC_MCONTEXT_FPSTATE_OFF(%eax)
#else
movl $FREEBSD_UC_MCONTEXT_FPOWNED_NONE,\
FREEBSD_UC_MCONTEXT_OWNEDFP_OFF(%eax)
movl $FREEBSD_UC_MCONTEXT_FPFMT_NODEV,\
FREEBSD_UC_MCONTEXT_FPFORMAT_OFF(%eax)
#endif
/*
* Require CPU with fxsave implemented, and enabled by OS.
*
* If passed ucontext is not aligned to 16-byte boundary,
* save fpu context into temporary aligned location on stack
* and then copy.
*/
leal FREEBSD_UC_MCONTEXT_FPSTATE_OFF(%eax), %edx
testl $0xf, %edx
je 1f
movl %edx, %edi
movl %esp, %edx
subl $512, %esp
andl $~0xf, %esp
fxsave (%esp)
movl %esp, %esi
movl $512/4,%ecx
rep; movsl
movl %edx, %esp
movl FREEBSD_UC_MCONTEXT_ESI_OFF(%eax), %esi
movl FREEBSD_UC_MCONTEXT_EDI_OFF(%eax), %edi
jmp 2f
1: fxsave (%edx)
2:
movl $FREEBSD_UC_MCONTEXT_MC_LEN_VAL,\
FREEBSD_UC_MCONTEXT_MC_LEN_OFF(%eax)