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| author | kfraser@localhost.localdomain <kfraser@localhost.localdomain> | 2007-01-09 16:59:52 +0000 |
|---|---|---|
| committer | kfraser@localhost.localdomain <kfraser@localhost.localdomain> | 2007-01-09 16:59:52 +0000 |
| commit | c9d971bec6fb2584ee469dbbfc30a6dc76d65204 (patch) | |
| tree | 065b214dd77a0357934c87bd1355ff2965ae3a5a /tools/tests | |
| parent | 0137f2b67b55aef4f8939d31740c49471172614f (diff) | |
| download | xen-c9d971bec6fb2584ee469dbbfc30a6dc76d65204.tar.gz xen-c9d971bec6fb2584ee469dbbfc30a6dc76d65204.tar.bz2 xen-c9d971bec6fb2584ee469dbbfc30a6dc76d65204.zip | |
[XEN] Emulate DAA/DAS the hard way. We cannot execute the instruction
directly within the emulator as it is unavailable if the emulator runs
in x86/64 mode.
Signed-off-by: Keir Fraser <keir@xensource.com>
Diffstat (limited to 'tools/tests')
| -rw-r--r-- | tools/tests/test_x86_emulator.c | 67 |
1 files changed, 65 insertions, 2 deletions
diff --git a/tools/tests/test_x86_emulator.c b/tools/tests/test_x86_emulator.c index 8bbfa3af28..89687e0d6e 100644 --- a/tools/tests/test_x86_emulator.c +++ b/tools/tests/test_x86_emulator.c @@ -15,6 +15,15 @@ typedef int64_t s64; #include <asm-x86/x86_emulate.h> #include <sys/mman.h> +/* EFLAGS bit definitions. */ +#define EFLG_OF (1<<11) +#define EFLG_DF (1<<10) +#define EFLG_SF (1<<7) +#define EFLG_ZF (1<<6) +#define EFLG_AF (1<<4) +#define EFLG_PF (1<<2) +#define EFLG_CF (1<<0) + static int read( unsigned int seg, unsigned long offset, @@ -98,8 +107,8 @@ int main(int argc, char **argv) struct x86_emulate_ctxt ctxt; struct cpu_user_regs regs; char instr[20] = { 0x01, 0x08 }; /* add %ecx,(%eax) */ - unsigned int *res; - int rc; + unsigned int *res, bcdres_native, bcdres_emul; + int rc, i; ctxt.regs = ®s; ctxt.address_bytes = 4; @@ -399,6 +408,60 @@ int main(int argc, char **argv) goto fail; printf("okay\n"); + printf("%-40s", "Testing daa/das (all inputs)..."); + /* Bits 0-7: AL; Bit 8: EFLG_AF; Bit 9: EFLG_CF; Bit 10: DAA vs. DAS. */ + for ( i = 0; i < 0x800; i++ ) + { + regs.eflags = (i & 0x200) ? EFLG_CF : 0; + regs.eflags |= (i & 0x100) ? EFLG_AF : 0; + if ( i & 0x400 ) + __asm__ ( + "pushf; and $0xffffffee,(%%esp); or %1,(%%esp); popf; das; " + "pushf; popl %1" + : "=a" (bcdres_native), "=r" (regs.eflags) + : "0" (i & 0xff), "1" (regs.eflags) ); + else + __asm__ ( + "pushf; and $0xffffffee,(%%esp); or %1,(%%esp); popf; daa; " + "pushf; popl %1" + : "=a" (bcdres_native), "=r" (regs.eflags) + : "0" (i & 0xff), "1" (regs.eflags) ); + bcdres_native |= (regs.eflags & EFLG_CF) ? 0x200 : 0; + bcdres_native |= (regs.eflags & EFLG_AF) ? 0x100 : 0; + + instr[0] = (i & 0x400) ? 0x2f: 0x27; /* daa/das */ + regs.eflags = (i & 0x200) ? EFLG_CF : 0; + regs.eflags |= (i & 0x100) ? EFLG_AF : 0; + regs.eip = (unsigned long)&instr[0]; + regs.eax = (unsigned char)i; + rc = x86_emulate(&ctxt, &emulops); + bcdres_emul = regs.eax; + bcdres_emul |= (regs.eflags & EFLG_CF) ? 0x200 : 0; + bcdres_emul |= (regs.eflags & EFLG_AF) ? 0x100 : 0; + if ( (rc != 0) || (regs.eax > 255) || + (regs.eip != (unsigned long)&instr[1]) ) + goto fail; + + if ( bcdres_emul != bcdres_native ) + { + printf("%s: AL=%02x %s %s\n" + "Output: AL=%02x %s %s\n" + "Emul.: AL=%02x %s %s\n", + (i & 0x400) ? "DAS" : "DAA", + (unsigned char)i, + (i & 0x200) ? "CF" : " ", + (i & 0x100) ? "AF" : " ", + (unsigned char)bcdres_native, + (bcdres_native & 0x200) ? "CF" : " ", + (bcdres_native & 0x100) ? "AF" : " ", + (unsigned char)bcdres_emul, + (bcdres_emul & 0x200) ? "CF" : " ", + (bcdres_emul & 0x100) ? "AF" : " "); + goto fail; + } + } + printf("okay\n"); + return 0; fail: |