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KVM: x86 emulator: add macros for executing instructions that may trap 

Like DIV and IDIV.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Avi Kivity 2010-08-26 11:59:00 +03:00
parent 739ae40606
commit f6b3597bde
1 changed files with 43 additions and 0 deletions
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43
arch/x86/kvm/emulate.c
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@ -331,6 +331,27 @@ struct group_dual {
"a" (_rax), "d" (_rdx)); \ "a" (_rax), "d" (_rdx)); \
} while (0) } while (0)
#define __emulate_1op_rax_rdx_ex(_op, _src, _rax, _rdx, _eflags, _suffix, _ex) \
do { \
unsigned long _tmp; \
\
__asm__ __volatile__ ( \
_PRE_EFLAGS("0", "5", "1") \
"1: \n\t" \
_op _suffix " %6; " \
"2: \n\t" \
_POST_EFLAGS("0", "5", "1") \
".pushsection .fixup,\"ax\" \n\t" \
"3: movb $1, %4 \n\t" \
"jmp 2b \n\t" \
".popsection \n\t" \
_ASM_EXTABLE(1b, 3b) \
: "=m" (_eflags), "=&r" (_tmp), \
"+a" (_rax), "+d" (_rdx), "+qm"(_ex) \
: "i" (EFLAGS_MASK), "m" ((_src).val), \
"a" (_rax), "d" (_rdx)); \
} while (0)
/* instruction has only one source operand, destination is implicit (e.g. mul, div, imul, idiv) */ /* instruction has only one source operand, destination is implicit (e.g. mul, div, imul, idiv) */
#define emulate_1op_rax_rdx(_op, _src, _rax, _rdx, _eflags) \ #define emulate_1op_rax_rdx(_op, _src, _rax, _rdx, _eflags) \
do { \ do { \
@ -342,6 +363,28 @@ struct group_dual {
} \ } \
} while (0) } while (0)
#define emulate_1op_rax_rdx_ex(_op, _src, _rax, _rdx, _eflags, _ex) \
do { \
switch((_src).bytes) { \
case 1: \
__emulate_1op_rax_rdx_ex(_op, _src, _rax, _rdx, \
_eflags, "b", _ex); \
break; \
case 2: \
__emulate_1op_rax_rdx_ex(_op, _src, _rax, _rdx, \
_eflags, "w", _ex); \
break; \
case 4: \
__emulate_1op_rax_rdx_ex(_op, _src, _rax, _rdx, \
_eflags, "l", _ex); \
break; \
case 8: ON64( \
__emulate_1op_rax_rdx_ex(_op, _src, _rax, _rdx, \
_eflags, "q", _ex)); \
break; \
} \
} while (0)
/* Fetch next part of the instruction being emulated. */ /* Fetch next part of the instruction being emulated. */
#define insn_fetch(_type, _size, _eip) \ #define insn_fetch(_type, _size, _eip) \
({ unsigned long _x; \ ({ unsigned long _x; \