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tccasm: allow one-line prefix+op things like "rep stosb"

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This commit is contained in:
Joe Soroka 2011-02-01 15:37:58 -08:00
parent a25325e9be
commit 87d84b7cb8
4 changed files with 68 additions and 2 deletions
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5
i386-asm.c
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@ -574,6 +574,11 @@ ST_FUNC void asm_opcode(TCCState *s1, int opcode)
static int a32 = 0, o32 = 0, addr32 = 0, data32 = 0;
#endif
/* force synthetic ';' after prefix instruction, so we can handle */
/* one-line things like "rep stosb" instead of only "rep\nstosb" */
if (opcode >= TOK_ASM_wait && opcode <= TOK_ASM_repnz)
unget_tok(';');
/* get operands */
pop = ops;
nb_ops = 0;

4
i386-asm.h
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@ -33,7 +33,6 @@
DEF_ASM_OP0(iret, 0xcf)
DEF_ASM_OP0(rsm, 0x0faa)
DEF_ASM_OP0(hlt, 0xf4)
DEF_ASM_OP0(wait, 0x9b)
DEF_ASM_OP0(nop, 0x90)
DEF_ASM_OP0(xlat, 0xd7)
@ -74,6 +73,8 @@ ALT(DEF_ASM_OP2(btcw, 0x0fbb, 0, OPC_MODRM | OPC_WL, OPT_REGW, OPT_REGW | OPT_EA
ALT(DEF_ASM_OP2(btcw, 0x0fba, 7, OPC_MODRM | OPC_WL, OPT_IM8, OPT_REGW | OPT_EA))
/* prefixes */
DEF_ASM_OP0(wait, 0x9b)
DEF_ASM_OP0(fwait, 0x9b)
#ifdef I386_ASM_16
DEF_ASM_OP0(a32, 0x67)
DEF_ASM_OP0(o32, 0x66)
@ -282,7 +283,6 @@ ALT(DEF_ASM_OP1(fiadds, 0xde, 0, OPC_FARITH | OPC_MODRM, OPT_EA))
DEF_ASM_OP0(fninit, 0xdbe3)
DEF_ASM_OP0(fnclex, 0xdbe2)
DEF_ASM_OP0(fnop, 0xd9d0)
DEF_ASM_OP0(fwait, 0x9b)
/* fp load */
DEF_ASM_OP1(fld, 0xd9c0, 0, OPC_REG, OPT_ST)

18
tests/asmtest.S
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@ -478,6 +478,24 @@ int $0x10
repz
repne
repnz
nop
lock ;negl (%eax)
wait ;pushf
rep ;stosb
repe ;lodsb
repz ;cmpsb
repne;movsb
repnz;outsb
/* handle one-line prefix + ops */
lock negl (%eax)
wait pushf
rep stosb
repe lodsb
repz cmpsb
repne movsb
repnz outsb
invd
wbinvd

43
tests/tcctest.c
View File

@ -2132,6 +2132,27 @@ __asm__ __volatile__(
return dest;
}
static char * strncat2(char * dest,const char * src,size_t count)
{
int d0, d1, d2, d3;
__asm__ __volatile__(
"repne scasb\n\t" /* one-line repne prefix + string op */
"decl %1\n\t"
"movl %8,%3\n"
"1:\tdecl %3\n\t"
"js 2f\n\t"
"lodsb\n\t"
"stosb\n\t"
"testb %%al,%%al\n\t"
"jne 1b\n"
"2:\txorl %2,%2\n\t"
"stosb"
: "=&S" (d0), "=&D" (d1), "=&a" (d2), "=&c" (d3)
: "0" (src),"1" (dest),"2" (0),"3" (0xffffffff), "g" (count)
: "memory");
return dest;
}
static inline void * memcpy1(void * to, const void * from, size_t n)
{
int d0, d1, d2;
@ -2150,6 +2171,24 @@ __asm__ __volatile__(
return (to);
}
static inline void * memcpy2(void * to, const void * from, size_t n)
{
int d0, d1, d2;
__asm__ __volatile__(
"rep movsl\n\t" /* one-line rep prefix + string op */
"testb $2,%b4\n\t"
"je 1f\n\t"
"movsw\n"
"1:\ttestb $1,%b4\n\t"
"je 2f\n\t"
"movsb\n"
"2:"
: "=&c" (d0), "=&D" (d1), "=&S" (d2)
:"0" (n/4), "q" (n),"1" ((long) to),"2" ((long) from)
: "memory");
return (to);
}
static __inline__ void sigaddset1(unsigned int *set, int _sig)
{
__asm__("btsl %1,%0" : "=m"(*set) : "Ir"(_sig - 1) : "cc");
@ -2199,6 +2238,10 @@ void asm_test(void)
strncat1(buf, " worldXXXXX", 3);
printf("%s\n", buf);
memcpy2(buf, "hello", 6);
strncat2(buf, " worldXXXXX", 3);
printf("%s\n", buf);
/* 'A' constraint test */
printf("mul64=0x%Lx\n", mul64(0x12345678, 0xabcd1234));
printf("inc64=0x%Lx\n", inc64(0x12345678ffffffff));