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added minimal segment support

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git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@28 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
bellard 2003-03-16 18:05:05 +00:00
parent 27362c82e9
commit 6dbad63eef
12 changed files with 550 additions and 103 deletions
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40
cpu-i386.h
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@ -123,6 +123,20 @@ typedef long double CPU86_LDouble;
typedef double CPU86_LDouble;
#endif
typedef struct SegmentCache {
uint8_t *base;
unsigned long limit;
uint8_t seg_32bit;
} SegmentCache;
typedef struct SegmentDescriptorTable {
uint8_t *base;
unsigned long limit;
/* this is the returned base when reading the register, just to
avoid that the emulated program modifies it */
unsigned long emu_base;
} SegmentDescriptorTable;
typedef struct CPUX86State {
/* standard registers */
uint32_t regs[8];
@ -135,9 +149,6 @@ typedef struct CPUX86State {
uint32_t cc_op;
int32_t df; /* D flag : 1 if D = 0, -1 if D = 1 */
/* segments */
uint8_t *segs_base[6];
/* FPU state */
unsigned int fpstt; /* top of stack index */
unsigned int fpus;
@ -145,12 +156,19 @@ typedef struct CPUX86State {
uint8_t fptags[8]; /* 0 = valid, 1 = empty */
CPU86_LDouble fpregs[8];
/* segments */
uint32_t segs[6];
/* emulator internal variables */
CPU86_LDouble ft0;
/* segments */
uint32_t segs[6]; /* selector values */
SegmentCache seg_cache[6]; /* info taken from LDT/GDT */
SegmentDescriptorTable gdt;
SegmentDescriptorTable ldt;
SegmentDescriptorTable idt;
/* various CPU modes */
int vm86;
/* exception handling */
jmp_buf jmp_env;
int exception_index;
@ -241,9 +259,17 @@ CPUX86State *cpu_x86_init(void);
int cpu_x86_exec(CPUX86State *s);
void cpu_x86_close(CPUX86State *s);
/* needed to load some predefinied segment registers */
void cpu_x86_load_seg(CPUX86State *s, int seg_reg, int selector);
/* internal functions */
#define GEN_FLAG_CODE32_SHIFT 0
#define GEN_FLAG_ADDSEG_SHIFT 1
#define GEN_FLAG_ST_SHIFT 2
int cpu_x86_gen_code(uint8_t *gen_code_buf, int max_code_size,
int *gen_code_size_ptr, uint8_t *pc_start);
int *gen_code_size_ptr, uint8_t *pc_start,
int flags);
void cpu_x86_tblocks_init(void);
#endif /* CPU_I386_H */