/* * x86 CPU test * * Copyright (c) 2003 Fabrice Bellard * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #define _GNU_SOURCE #include #include #include #include #include #include #include #include #include #include #include /* Setting this to 1 creates a very comprehensive test of integer condition codes. */ #define TEST_INTEGER_VERBOSE 1 //#define LINUX_VM86_IOPL_FIX //#define TEST_P4_FLAGS #define xglue(x, y) x ## y #define glue(x, y) xglue(x, y) #define stringify(s) tostring(s) #define tostring(s) #s #define CC_C 0x0001 #define CC_P 0x0004 #define CC_A 0x0010 #define CC_Z 0x0040 #define CC_S 0x0080 #define CC_O 0x0800 #define __init_call __attribute__ ((unused,__section__ (".initcall.init"))) static void *call_start __init_call = NULL; #define CC_MASK (CC_C | CC_P | CC_Z | CC_S | CC_O | CC_A) #define OP add #include "test-i386.h" #define OP sub #include "test-i386.h" #define OP xor #include "test-i386.h" #define OP and #include "test-i386.h" #define OP or #include "test-i386.h" #define OP cmp #include "test-i386.h" #define OP adc #define OP_CC #include "test-i386.h" #define OP sbb #define OP_CC #include "test-i386.h" #define OP inc #define OP_CC #define OP1 #include "test-i386.h" #define OP dec #define OP_CC #define OP1 #include "test-i386.h" #define OP neg #define OP_CC #define OP1 #include "test-i386.h" #define OP not #define OP_CC #define OP1 #include "test-i386.h" #undef CC_MASK #define CC_MASK (CC_C | CC_P | CC_Z | CC_S | CC_O) #define OP shl #include "test-i386-shift.h" #define OP shr #include "test-i386-shift.h" #define OP sar #include "test-i386-shift.h" #define OP rol #include "test-i386-shift.h" #define OP ror #include "test-i386-shift.h" #define OP rcr #define OP_CC #include "test-i386-shift.h" #define OP rcl #define OP_CC #include "test-i386-shift.h" #define OP shld #define OP_SHIFTD #define OP_NOBYTE #include "test-i386-shift.h" #define OP shrd #define OP_SHIFTD #define OP_NOBYTE #include "test-i386-shift.h" /* XXX: should be more precise ? */ #undef CC_MASK #define CC_MASK (CC_C) #define OP bt #define OP_NOBYTE #include "test-i386-shift.h" #define OP bts #define OP_NOBYTE #include "test-i386-shift.h" #define OP btr #define OP_NOBYTE #include "test-i386-shift.h" #define OP btc #define OP_NOBYTE #include "test-i386-shift.h" /* lea test (modrm support) */ #define TEST_LEA(STR)\ {\ asm("leal " STR ", %0"\ : "=r" (res)\ : "a" (eax), "b" (ebx), "c" (ecx), "d" (edx), "S" (esi), "D" (edi));\ printf("lea %s = %08x\n", STR, res);\ } #define TEST_LEA16(STR)\ {\ asm(".code16 ; .byte 0x67 ; leal " STR ", %0 ; .code32"\ : "=wq" (res)\ : "a" (eax), "b" (ebx), "c" (ecx), "d" (edx), "S" (esi), "D" (edi));\ printf("lea %s = %08x\n", STR, res);\ } void test_lea(void) { int eax, ebx, ecx, edx, esi, edi, res; eax = 0x0001; ebx = 0x0002; ecx = 0x0004; edx = 0x0008; esi = 0x0010; edi = 0x0020; TEST_LEA("0x4000"); TEST_LEA("(%%eax)"); TEST_LEA("(%%ebx)"); TEST_LEA("(%%ecx)"); TEST_LEA("(%%edx)"); TEST_LEA("(%%esi)"); TEST_LEA("(%%edi)"); TEST_LEA("0x40(%%eax)"); TEST_LEA("0x40(%%ebx)"); TEST_LEA("0x40(%%ecx)"); TEST_LEA("0x40(%%edx)"); TEST_LEA("0x40(%%esi)"); TEST_LEA("0x40(%%edi)"); TEST_LEA("0x4000(%%eax)"); TEST_LEA("0x4000(%%ebx)"); TEST_LEA("0x4000(%%ecx)"); TEST_LEA("0x4000(%%edx)"); TEST_LEA("0x4000(%%esi)"); TEST_LEA("0x4000(%%edi)"); TEST_LEA("(%%eax, %%ecx)"); TEST_LEA("(%%ebx, %%edx)"); TEST_LEA("(%%ecx, %%ecx)"); TEST_LEA("(%%edx, %%ecx)"); TEST_LEA("(%%esi, %%ecx)"); TEST_LEA("(%%edi, %%ecx)"); TEST_LEA("0x40(%%eax, %%ecx)"); TEST_LEA("0x4000(%%ebx, %%edx)"); TEST_LEA("(%%ecx, %%ecx, 2)"); TEST_LEA("(%%edx, %%ecx, 4)"); TEST_LEA("(%%esi, %%ecx, 8)"); TEST_LEA("(,%%eax, 2)"); TEST_LEA("(,%%ebx, 4)"); TEST_LEA("(,%%ecx, 8)"); TEST_LEA("0x40(,%%eax, 2)"); TEST_LEA("0x40(,%%ebx, 4)"); TEST_LEA("0x40(,%%ecx, 8)"); TEST_LEA("-10(%%ecx, %%ecx, 2)"); TEST_LEA("-10(%%edx, %%ecx, 4)"); TEST_LEA("-10(%%esi, %%ecx, 8)"); TEST_LEA("0x4000(%%ecx, %%ecx, 2)"); TEST_LEA("0x4000(%%edx, %%ecx, 4)"); TEST_LEA("0x4000(%%esi, %%ecx, 8)"); } #define TEST_JCC(JCC, v1, v2)\ {\ int res;\ asm("movl $1, %0\n\t"\ "cmpl %2, %1\n\t"\ "j" JCC " 1f\n\t"\ "movl $0, %0\n\t"\ "1:\n\t"\ : "=r" (res)\ : "r" (v1), "r" (v2));\ printf("%-10s %d\n", "j" JCC, res);\ \ asm("movl $0, %0\n\t"\ "cmpl %2, %1\n\t"\ "set" JCC " %b0\n\t"\ : "=r" (res)\ : "r" (v1), "r" (v2));\ printf("%-10s %d\n", "set" JCC, res);\ { int one = 1; \ asm("movl $0x12345678, %0\n\t"\ "cmpl %2, %1\n\t"\ "cmov" JCC "l %3, %0\n\t"\ : "=r" (res)\ : "r" (v1), "r" (v2), "m" (one));\ printf("%-10s R=0x%08x\n", "cmov" JCC "l", res);\ asm("movl $0x12345678, %0\n\t"\ "cmpl %2, %1\n\t"\ "cmov" JCC "w %w3, %w0\n\t"\ : "=r" (res)\ : "r" (v1), "r" (v2), "r" (1));\ printf("%-10s R=0x%08x\n", "cmov" JCC "w", res);\ } \ } /* various jump tests */ void test_jcc(void) { TEST_JCC("ne", 1, 1); TEST_JCC("ne", 1, 0); TEST_JCC("e", 1, 1); TEST_JCC("e", 1, 0); TEST_JCC("l", 1, 1); TEST_JCC("l", 1, 0); TEST_JCC("l", 1, -1); TEST_JCC("le", 1, 1); TEST_JCC("le", 1, 0); TEST_JCC("le", 1, -1); TEST_JCC("ge", 1, 1); TEST_JCC("ge", 1, 0); TEST_JCC("ge", -1, 1); TEST_JCC("g", 1, 1); TEST_JCC("g", 1, 0); TEST_JCC("g", 1, -1); TEST_JCC("b", 1, 1); TEST_JCC("b", 1, 0); TEST_JCC("b", 1, -1); TEST_JCC("be", 1, 1); TEST_JCC("be", 1, 0); TEST_JCC("be", 1, -1); TEST_JCC("ae", 1, 1); TEST_JCC("ae", 1, 0); TEST_JCC("ae", 1, -1); TEST_JCC("a", 1, 1); TEST_JCC("a", 1, 0); TEST_JCC("a", 1, -1); TEST_JCC("p", 1, 1); TEST_JCC("p", 1, 0); TEST_JCC("np", 1, 1); TEST_JCC("np", 1, 0); TEST_JCC("o", 0x7fffffff, 0); TEST_JCC("o", 0x7fffffff, -1); TEST_JCC("no", 0x7fffffff, 0); TEST_JCC("no", 0x7fffffff, -1); TEST_JCC("s", 0, 1); TEST_JCC("s", 0, -1); TEST_JCC("s", 0, 0); TEST_JCC("ns", 0, 1); TEST_JCC("ns", 0, -1); TEST_JCC("ns", 0, 0); } #undef CC_MASK #ifdef TEST_P4_FLAGS #define CC_MASK (CC_C | CC_P | CC_Z | CC_S | CC_O | CC_A) #else #define CC_MASK (CC_O | CC_C) #endif #define OP mul #include "test-i386-muldiv.h" #define OP imul #include "test-i386-muldiv.h" void test_imulw2(int op0, int op1) { int res, s1, s0, flags; s0 = op0; s1 = op1; res = s0; flags = 0; asm ("push %4\n\t" "popf\n\t" "imulw %w2, %w0\n\t" "pushf\n\t" "popl %1\n\t" : "=q" (res), "=g" (flags) : "q" (s1), "0" (res), "1" (flags)); printf("%-10s A=%08x B=%08x R=%08x CC=%04x\n", "imulw", s0, s1, res, flags & CC_MASK); } void test_imull2(int op0, int op1) { int res, s1, s0, flags; s0 = op0; s1 = op1; res = s0; flags = 0; asm ("push %4\n\t" "popf\n\t" "imull %2, %0\n\t" "pushf\n\t" "popl %1\n\t" : "=q" (res), "=g" (flags) : "q" (s1), "0" (res), "1" (flags)); printf("%-10s A=%08x B=%08x R=%08x CC=%04x\n", "imull", s0, s1, res, flags & CC_MASK); } #define TEST_IMUL_IM(size, size1, op0, op1)\ {\ int res, flags;\ flags = 0;\ res = 0;\ asm ("push %3\n\t"\ "popf\n\t"\ "imul" size " $" #op0 ", %" size1 "2, %" size1 "0\n\t" \ "pushf\n\t"\ "popl %1\n\t"\ : "=r" (res), "=g" (flags)\ : "r" (op1), "1" (flags), "0" (res));\ printf("%-10s A=%08x B=%08x R=%08x CC=%04x\n",\ "imul" size, op0, op1, res, flags & CC_MASK);\ } #undef CC_MASK #define CC_MASK (0) #define OP div #include "test-i386-muldiv.h" #define OP idiv #include "test-i386-muldiv.h" void test_mul(void) { test_imulb(0x1234561d, 4); test_imulb(3, -4); test_imulb(0x80, 0x80); test_imulb(0x10, 0x10); test_imulw(0, 0, 0); test_imulw(0, 0xFF, 0xFF); test_imulw(0, 0xFF, 0x100); test_imulw(0, 0x1234001d, 45); test_imulw(0, 23, -45); test_imulw(0, 0x8000, 0x8000); test_imulw(0, 0x100, 0x100); test_imull(0, 0, 0); test_imull(0, 0xFFFF, 0xFFFF); test_imull(0, 0xFFFF, 0x10000); test_imull(0, 0x1234001d, 45); test_imull(0, 23, -45); test_imull(0, 0x80000000, 0x80000000); test_imull(0, 0x10000, 0x10000); test_mulb(0x1234561d, 4); test_mulb(3, -4); test_mulb(0x80, 0x80); test_mulb(0x10, 0x10); test_mulw(0, 0x1234001d, 45); test_mulw(0, 23, -45); test_mulw(0, 0x8000, 0x8000); test_mulw(0, 0x100, 0x100); test_mull(0, 0x1234001d, 45); test_mull(0, 23, -45); test_mull(0, 0x80000000, 0x80000000); test_mull(0, 0x10000, 0x10000); test_imulw2(0x1234001d, 45); test_imulw2(23, -45); test_imulw2(0x8000, 0x8000); test_imulw2(0x100, 0x100); test_imull2(0x1234001d, 45); test_imull2(23, -45); test_imull2(0x80000000, 0x80000000); test_imull2(0x10000, 0x10000); TEST_IMUL_IM("w", "w", 45, 0x1234); TEST_IMUL_IM("w", "w", -45, 23); TEST_IMUL_IM("w", "w", 0x8000, 0x80000000); TEST_IMUL_IM("w", "w", 0x7fff, 0x1000); TEST_IMUL_IM("l", "", 45, 0x1234); TEST_IMUL_IM("l", "", -45, 23); TEST_IMUL_IM("l", "", 0x8000, 0x80000000); TEST_IMUL_IM("l", "", 0x7fff, 0x1000); test_idivb(0x12341678, 0x127e); test_idivb(0x43210123, -5); test_idivb(0x12340004, -1); test_idivw(0, 0x12345678, 12347); test_idivw(0, -23223, -45); test_idivw(0, 0x12348000, -1); test_idivw(0x12343, 0x12345678, 0x81238567); test_idivl(0, 0x12345678, 12347); test_idivl(0, -233223, -45); test_idivl(0, 0x80000000, -1); test_idivl(0x12343, 0x12345678, 0x81234567); test_divb(0x12341678, 0x127e); test_divb(0x43210123, -5); test_divb(0x12340004, -1); test_divw(0, 0x12345678, 12347); test_divw(0, -23223, -45); test_divw(0, 0x12348000, -1); test_divw(0x12343, 0x12345678, 0x81238567); test_divl(0, 0x12345678, 12347); test_divl(0, -233223, -45); test_divl(0, 0x80000000, -1); test_divl(0x12343, 0x12345678, 0x81234567); } #define TEST_BSX(op, size, op0)\ {\ int res, val, resz;\ val = op0;\ asm("xorl %1, %1\n\t"\ "movl $0x12345678, %0\n\t"\ #op " %" size "2, %" size "0\n\t" \ "setz %b1" \ : "=r" (res), "=q" (resz)\ : "r" (val));\ printf("%-10s A=%08x R=%08x %d\n", #op, val, res, resz);\ } void test_bsx(void) { TEST_BSX(bsrw, "w", 0); TEST_BSX(bsrw, "w", 0x12340128); TEST_BSX(bsrl, "", 0); TEST_BSX(bsrl, "", 0x00340128); TEST_BSX(bsfw, "w", 0); TEST_BSX(bsfw, "w", 0x12340128); TEST_BSX(bsfl, "", 0); TEST_BSX(bsfl, "", 0x00340128); } /**********************************************/ void test_fops(double a, double b) { printf("a=%f b=%f a+b=%f\n", a, b, a + b); printf("a=%f b=%f a-b=%f\n", a, b, a - b); printf("a=%f b=%f a*b=%f\n", a, b, a * b); printf("a=%f b=%f a/b=%f\n", a, b, a / b); printf("a=%f b=%f fmod(a, b)=%f\n", a, b, fmod(a, b)); printf("a=%f sqrt(a)=%f\n", a, sqrt(a)); printf("a=%f sin(a)=%f\n", a, sin(a)); printf("a=%f cos(a)=%f\n", a, cos(a)); printf("a=%f tan(a)=%f\n", a, tan(a)); printf("a=%f log(a)=%f\n", a, log(a)); printf("a=%f exp(a)=%f\n", a, exp(a)); printf("a=%f b=%f atan2(a, b)=%f\n", a, b, atan2(a, b)); /* just to test some op combining */ printf("a=%f asin(sin(a))=%f\n", a, asin(sin(a))); printf("a=%f acos(cos(a))=%f\n", a, acos(cos(a))); printf("a=%f atan(tan(a))=%f\n", a, atan(tan(a))); } void test_fcmp(double a, double b) { printf("(%f<%f)=%d\n", a, b, a < b); printf("(%f<=%f)=%d\n", a, b, a <= b); printf("(%f==%f)=%d\n", a, b, a == b); printf("(%f>%f)=%d\n", a, b, a > b); printf("(%f<=%f)=%d\n", a, b, a >= b); { unsigned int eflags; /* test f(u)comi instruction */ asm("fcomi %2, %1\n" "pushf\n" "pop %0\n" : "=r" (eflags) : "t" (a), "u" (b)); printf("fcomi(%f %f)=%08x\n", a, b, eflags & (CC_Z | CC_P | CC_C)); } } void test_fcvt(double a) { float fa; long double la; int16_t fpuc; int i; int64_t lla; int ia; int16_t wa; double ra; fa = a; la = a; printf("(float)%f = %f\n", a, fa); printf("(long double)%f = %Lf\n", a, la); printf("a=%016Lx\n", *(long long *)&a); printf("la=%016Lx %04x\n", *(long long *)&la, *(unsigned short *)((char *)(&la) + 8)); /* test all roundings */ asm volatile ("fstcw %0" : "=m" (fpuc)); for(i=0;i<4;i++) { int16_t tmp = (fpuc & ~0x0c00) | (i << 10); asm volatile ("fldcw %0" : : "m" (tmp)); asm volatile ("fist %0" : "=m" (wa) : "t" (a)); asm volatile ("fistl %0" : "=m" (ia) : "t" (a)); asm volatile ("fistpll %0" : "=m" (lla) : "t" (a) : "st"); asm volatile ("frndint ; fstl %0" : "=m" (ra) : "t" (a)); asm volatile ("fldcw %0" : : "m" (fpuc)); printf("(short)a = %d\n", wa); printf("(int)a = %d\n", ia); printf("(int64_t)a = %Ld\n", lla); printf("rint(a) = %f\n", ra); } } #define TEST(N) \ asm("fld" #N : "=t" (a)); \ printf("fld" #N "= %f\n", a); void test_fconst(void) { double a; TEST(1); TEST(l2t); TEST(l2e); TEST(pi); TEST(lg2); TEST(ln2); TEST(z); } void test_fbcd(double a) { unsigned short bcd[5]; double b; asm("fbstp %0" : "=m" (bcd[0]) : "t" (a) : "st"); asm("fbld %1" : "=t" (b) : "m" (bcd[0])); printf("a=%f bcd=%04x%04x%04x%04x%04x b=%f\n", a, bcd[4], bcd[3], bcd[2], bcd[1], bcd[0], b); } #define TEST_ENV(env, save, restore)\ {\ memset((env), 0xaa, sizeof(*(env)));\ for(i=0;i<5;i++)\ asm volatile ("fldl %0" : : "m" (dtab[i]));\ asm(save " %0\n" : : "m" (*(env)));\ asm(restore " %0\n": : "m" (*(env)));\ for(i=0;i<5;i++)\ asm volatile ("fstpl %0" : "=m" (rtab[i]));\ for(i=0;i<5;i++)\ printf("res[%d]=%f\n", i, rtab[i]);\ printf("fpuc=%04x fpus=%04x fptag=%04x\n",\ (env)->fpuc,\ (env)->fpus & 0xff00,\ (env)->fptag);\ } void test_fenv(void) { struct __attribute__((packed)) { uint16_t fpuc; uint16_t dummy1; uint16_t fpus; uint16_t dummy2; uint16_t fptag; uint16_t dummy3; uint32_t ignored[4]; long double fpregs[8]; } float_env32; struct __attribute__((packed)) { uint16_t fpuc; uint16_t fpus; uint16_t fptag; uint16_t ignored[4]; long double fpregs[8]; } float_env16; double dtab[8]; double rtab[8]; int i; for(i=0;i<8;i++) dtab[i] = i + 1; TEST_ENV(&float_env16, "data16 fnstenv", "data16 fldenv"); TEST_ENV(&float_env16, "data16 fnsave", "data16 frstor"); TEST_ENV(&float_env32, "fnstenv", "fldenv"); TEST_ENV(&float_env32, "fnsave", "frstor"); /* test for ffree */ for(i=0;i<5;i++) asm volatile ("fldl %0" : : "m" (dtab[i])); asm volatile("ffree %st(2)"); asm volatile ("fnstenv %0\n" : : "m" (float_env32)); asm volatile ("fninit"); printf("fptag=%04x\n", float_env32.fptag); } #define TEST_FCMOV(a, b, eflags, CC)\ {\ double res;\ asm("push %3\n"\ "popf\n"\ "fcmov" CC " %2, %0\n"\ : "=t" (res)\ : "0" (a), "u" (b), "g" (eflags));\ printf("fcmov%s eflags=0x%04x-> %f\n", \ CC, eflags, res);\ } void test_fcmov(void) { double a, b; int eflags, i; a = 1.0; b = 2.0; for(i = 0; i < 4; i++) { eflags = 0; if (i & 1) eflags |= CC_C; if (i & 2) eflags |= CC_Z; TEST_FCMOV(a, b, eflags, "b"); TEST_FCMOV(a, b, eflags, "e"); TEST_FCMOV(a, b, eflags, "be"); TEST_FCMOV(a, b, eflags, "nb"); TEST_FCMOV(a, b, eflags, "ne"); TEST_FCMOV(a, b, eflags, "nbe"); } TEST_FCMOV(a, b, 0, "u"); TEST_FCMOV(a, b, CC_P, "u"); TEST_FCMOV(a, b, 0, "nu"); TEST_FCMOV(a, b, CC_P, "nu"); } void test_floats(void) { test_fops(2, 3); test_fops(1.4, -5); test_fcmp(2, -1); test_fcmp(2, 2); test_fcmp(2, 3); test_fcvt(0.5); test_fcvt(-0.5); test_fcvt(1.0/7.0); test_fcvt(-1.0/9.0); test_fcvt(32768); test_fcvt(-1e20); test_fconst(); // REINSTATE (maybe): test_fbcd(1234567890123456); // REINSTATE (maybe): test_fbcd(-123451234567890); // REINSTATE: test_fenv(); // REINSTATE: test_fcmov(); } /**********************************************/ #if 0 #define TEST_BCD(op, op0, cc_in, cc_mask)\ {\ int res, flags;\ res = op0;\ flags = cc_in;\ asm ("push %3\n\t"\ "popf\n\t"\ #op "\n\t"\ "pushf\n\t"\ "popl %1\n\t"\ : "=a" (res), "=g" (flags)\ : "0" (res), "1" (flags));\ printf("%-10s A=%08x R=%08x CCIN=%04x CC=%04x\n",\ #op, op0, res, cc_in, flags & cc_mask);\ } void test_bcd(void) { TEST_BCD(daa, 0x12340503, CC_A, (CC_C | CC_P | CC_Z | CC_S | CC_A)); TEST_BCD(daa, 0x12340506, CC_A, (CC_C | CC_P | CC_Z | CC_S | CC_A)); TEST_BCD(daa, 0x12340507, CC_A, (CC_C | CC_P | CC_Z | CC_S | CC_A)); TEST_BCD(daa, 0x12340559, CC_A, (CC_C | CC_P | CC_Z | CC_S | CC_A)); TEST_BCD(daa, 0x12340560, CC_A, (CC_C | CC_P | CC_Z | CC_S | CC_A)); TEST_BCD(daa, 0x1234059f, CC_A, (CC_C | CC_P | CC_Z | CC_S | CC_A)); TEST_BCD(daa, 0x123405a0, CC_A, (CC_C | CC_P | CC_Z | CC_S | CC_A)); TEST_BCD(daa, 0x12340503, 0, (CC_C | CC_P | CC_Z | CC_S | CC_A)); TEST_BCD(daa, 0x12340506, 0, (CC_C | CC_P | CC_Z | CC_S | CC_A)); TEST_BCD(daa, 0x12340503, CC_C, (CC_C | CC_P | CC_Z | CC_S | CC_A)); TEST_BCD(daa, 0x12340506, CC_C, (CC_C | CC_P | CC_Z | CC_S | CC_A)); TEST_BCD(daa, 0x12340503, CC_C | CC_A, (CC_C | CC_P | CC_Z | CC_S | CC_A)); TEST_BCD(daa, 0x12340506, CC_C | CC_A, (CC_C | CC_P | CC_Z | CC_S | CC_A)); TEST_BCD(das, 0x12340503, CC_A, (CC_C | CC_P | CC_Z | CC_S | CC_A)); TEST_BCD(das, 0x12340506, CC_A, (CC_C | CC_P | CC_Z | CC_S | CC_A)); TEST_BCD(das, 0x12340507, CC_A, (CC_C | CC_P | CC_Z | CC_S | CC_A)); TEST_BCD(das, 0x12340559, CC_A, (CC_C | CC_P | CC_Z | CC_S | CC_A)); TEST_BCD(das, 0x12340560, CC_A, (CC_C | CC_P | CC_Z | CC_S | CC_A)); TEST_BCD(das, 0x1234059f, CC_A, (CC_C | CC_P | CC_Z | CC_S | CC_A)); TEST_BCD(das, 0x123405a0, CC_A, (CC_C | CC_P | CC_Z | CC_S | CC_A)); TEST_BCD(das, 0x12340503, 0, (CC_C | CC_P | CC_Z | CC_S | CC_A)); TEST_BCD(das, 0x12340506, 0, (CC_C | CC_P | CC_Z | CC_S | CC_A)); TEST_BCD(das, 0x12340503, CC_C, (CC_C | CC_P | CC_Z | CC_S | CC_A)); TEST_BCD(das, 0x12340506, CC_C, (CC_C | CC_P | CC_Z | CC_S | CC_A)); TEST_BCD(das, 0x12340503, CC_C | CC_A, (CC_C | CC_P | CC_Z | CC_S | CC_A)); TEST_BCD(das, 0x12340506, CC_C | CC_A, (CC_C | CC_P | CC_Z | CC_S | CC_A)); TEST_BCD(aaa, 0x12340205, CC_A, (CC_C | CC_A)); TEST_BCD(aaa, 0x12340306, CC_A, (CC_C | CC_A)); TEST_BCD(aaa, 0x1234040a, CC_A, (CC_C | CC_A)); TEST_BCD(aaa, 0x123405fa, CC_A, (CC_C | CC_A)); TEST_BCD(aaa, 0x12340205, 0, (CC_C | CC_A)); TEST_BCD(aaa, 0x12340306, 0, (CC_C | CC_A)); TEST_BCD(aaa, 0x1234040a, 0, (CC_C | CC_A)); TEST_BCD(aaa, 0x123405fa, 0, (CC_C | CC_A)); TEST_BCD(aas, 0x12340205, CC_A, (CC_C | CC_A)); TEST_BCD(aas, 0x12340306, CC_A, (CC_C | CC_A)); TEST_BCD(aas, 0x1234040a, CC_A, (CC_C | CC_A)); TEST_BCD(aas, 0x123405fa, CC_A, (CC_C | CC_A)); TEST_BCD(aas, 0x12340205, 0, (CC_C | CC_A)); TEST_BCD(aas, 0x12340306, 0, (CC_C | CC_A)); TEST_BCD(aas, 0x1234040a, 0, (CC_C | CC_A)); TEST_BCD(aas, 0x123405fa, 0, (CC_C | CC_A)); TEST_BCD(aam, 0x12340547, CC_A, (CC_C | CC_P | CC_Z | CC_S | CC_O | CC_A)); TEST_BCD(aad, 0x12340407, CC_A, (CC_C | CC_P | CC_Z | CC_S | CC_O | CC_A)); } #endif /* 0 */ #define TEST_XCHG(op, size, opconst)\ {\ int op0, op1;\ op0 = 0x12345678;\ op1 = 0xfbca7654;\ asm(#op " %" size "0, %" size "1" \ : "=q" (op0), opconst (op1) \ : "0" (op0), "1" (op1));\ printf("%-10s A=%08x B=%08x\n",\ #op, op0, op1);\ } #define TEST_CMPXCHG(op, size, opconst, eax)\ {\ int op0, op1;\ op0 = 0x12345678;\ op1 = 0xfbca7654;\ asm(#op " %" size "0, %" size "1" \ : "=q" (op0), opconst (op1) \ : "0" (op0), "1" (op1), "a" (eax));\ printf("%-10s EAX=%08x A=%08x C=%08x\n",\ #op, eax, op0, op1);\ } void test_xchg(void) { TEST_XCHG(xchgl, "", "=q"); TEST_XCHG(xchgw, "w", "=q"); TEST_XCHG(xchgb, "b", "=q"); TEST_XCHG(xchgl, "", "=m"); TEST_XCHG(xchgw, "w", "=m"); TEST_XCHG(xchgb, "b", "=m"); #if 0 TEST_XCHG(xaddl, "", "=q"); TEST_XCHG(xaddw, "w", "=q"); TEST_XCHG(xaddb, "b", "=q"); { int res; res = 0x12345678; asm("xaddl %1, %0" : "=r" (res) : "0" (res)); printf("xaddl same res=%08x\n", res); } TEST_XCHG(xaddl, "", "=m"); TEST_XCHG(xaddw, "w", "=m"); TEST_XCHG(xaddb, "b", "=m"); #endif TEST_CMPXCHG(cmpxchgl, "", "=q", 0xfbca7654); TEST_CMPXCHG(cmpxchgw, "w", "=q", 0xfbca7654); TEST_CMPXCHG(cmpxchgb, "b", "=q", 0xfbca7654); TEST_CMPXCHG(cmpxchgl, "", "=q", 0xfffefdfc); TEST_CMPXCHG(cmpxchgw, "w", "=q", 0xfffefdfc); TEST_CMPXCHG(cmpxchgb, "b", "=q", 0xfffefdfc); TEST_CMPXCHG(cmpxchgl, "", "=m", 0xfbca7654); TEST_CMPXCHG(cmpxchgw, "w", "=m", 0xfbca7654); TEST_CMPXCHG(cmpxchgb, "b", "=m", 0xfbca7654); TEST_CMPXCHG(cmpxchgl, "", "=m", 0xfffefdfc); TEST_CMPXCHG(cmpxchgw, "w", "=m", 0xfffefdfc); TEST_CMPXCHG(cmpxchgb, "b", "=m", 0xfffefdfc); #if 0 { uint64_t op0, op1, op2; int i, eflags; for(i = 0; i < 2; i++) { op0 = 0x123456789abcd; if (i == 0) op1 = 0xfbca765423456; else op1 = op0; op2 = 0x6532432432434; asm("cmpxchg8b %1\n" "pushf\n" "popl %2\n" : "=A" (op0), "=m" (op1), "=g" (eflags) : "0" (op0), "m" (op1), "b" ((int)op2), "c" ((int)(op2 >> 32))); printf("cmpxchg8b: op0=%016llx op1=%016llx CC=%02x\n", op0, op1, eflags & CC_Z); } } #endif } /**********************************************/ /* segmentation tests */ #if 0 #include #include #include _syscall3(int, modify_ldt, int, func, void *, ptr, unsigned long, bytecount) #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 66) #define modify_ldt_ldt_s user_desc #endif uint8_t seg_data1[4096]; uint8_t seg_data2[4096]; #define MK_SEL(n) (((n) << 3) | 7) #define TEST_LR(op, size, seg, mask)\ {\ int res, res2;\ res = 0x12345678;\ asm (op " %" size "2, %" size "0\n" \ "movl $0, %1\n"\ "jnz 1f\n"\ "movl $1, %1\n"\ "1:\n"\ : "=r" (res), "=r" (res2) : "m" (seg), "0" (res));\ printf(op ": Z=%d %08x\n", res2, res & ~(mask));\ } /* NOTE: we use Linux modify_ldt syscall */ void test_segs(void) { struct modify_ldt_ldt_s ldt; long long ldt_table[3]; int res, res2; char tmp; struct { uint32_t offset; uint16_t seg; } __attribute__((packed)) segoff; ldt.entry_number = 1; ldt.base_addr = (unsigned long)&seg_data1; ldt.limit = (sizeof(seg_data1) + 0xfff) >> 12; ldt.seg_32bit = 1; ldt.contents = MODIFY_LDT_CONTENTS_DATA; ldt.read_exec_only = 0; ldt.limit_in_pages = 1; ldt.seg_not_present = 0; ldt.useable = 1; modify_ldt(1, &ldt, sizeof(ldt)); /* write ldt entry */ ldt.entry_number = 2; ldt.base_addr = (unsigned long)&seg_data2; ldt.limit = (sizeof(seg_data2) + 0xfff) >> 12; ldt.seg_32bit = 1; ldt.contents = MODIFY_LDT_CONTENTS_DATA; ldt.read_exec_only = 0; ldt.limit_in_pages = 1; ldt.seg_not_present = 0; ldt.useable = 1; modify_ldt(1, &ldt, sizeof(ldt)); /* write ldt entry */ modify_ldt(0, &ldt_table, sizeof(ldt_table)); /* read ldt entries */ #if 0 { int i; for(i=0;i<3;i++) printf("%d: %016Lx\n", i, ldt_table[i]); } #endif /* do some tests with fs or gs */ asm volatile ("movl %0, %%fs" : : "r" (MK_SEL(1))); seg_data1[1] = 0xaa; seg_data2[1] = 0x55; asm volatile ("fs movzbl 0x1, %0" : "=r" (res)); printf("FS[1] = %02x\n", res); asm volatile ("pushl %%gs\n" "movl %1, %%gs\n" "gs movzbl 0x1, %0\n" "popl %%gs\n" : "=r" (res) : "r" (MK_SEL(2))); printf("GS[1] = %02x\n", res); /* tests with ds/ss (implicit segment case) */ tmp = 0xa5; asm volatile ("pushl %%ebp\n\t" "pushl %%ds\n\t" "movl %2, %%ds\n\t" "movl %3, %%ebp\n\t" "movzbl 0x1, %0\n\t" "movzbl (%%ebp), %1\n\t" "popl %%ds\n\t" "popl %%ebp\n\t" : "=r" (res), "=r" (res2) : "r" (MK_SEL(1)), "r" (&tmp)); printf("DS[1] = %02x\n", res); printf("SS[tmp] = %02x\n", res2); segoff.seg = MK_SEL(2); segoff.offset = 0xabcdef12; asm volatile("lfs %2, %0\n\t" "movl %%fs, %1\n\t" : "=r" (res), "=g" (res2) : "m" (segoff)); printf("FS:reg = %04x:%08x\n", res2, res); TEST_LR("larw", "w", MK_SEL(2), 0x0100); TEST_LR("larl", "", MK_SEL(2), 0x0100); TEST_LR("lslw", "w", MK_SEL(2), 0); TEST_LR("lsll", "", MK_SEL(2), 0); TEST_LR("larw", "w", 0xfff8, 0); TEST_LR("larl", "", 0xfff8, 0); TEST_LR("lslw", "w", 0xfff8, 0); TEST_LR("lsll", "", 0xfff8, 0); } #endif #if 0 /* 16 bit code test */ extern char code16_start, code16_end; extern char code16_func1; extern char code16_func2; extern char code16_func3; void test_code16(void) { struct modify_ldt_ldt_s ldt; int res, res2; /* build a code segment */ ldt.entry_number = 1; ldt.base_addr = (unsigned long)&code16_start; ldt.limit = &code16_end - &code16_start; ldt.seg_32bit = 0; ldt.contents = MODIFY_LDT_CONTENTS_CODE; ldt.read_exec_only = 0; ldt.limit_in_pages = 0; ldt.seg_not_present = 0; ldt.useable = 1; modify_ldt(1, &ldt, sizeof(ldt)); /* write ldt entry */ /* call the first function */ asm volatile ("lcall %1, %2" : "=a" (res) : "i" (MK_SEL(1)), "i" (&code16_func1): "memory", "cc"); printf("func1() = 0x%08x\n", res); asm volatile ("lcall %2, %3" : "=a" (res), "=c" (res2) : "i" (MK_SEL(1)), "i" (&code16_func2): "memory", "cc"); printf("func2() = 0x%08x spdec=%d\n", res, res2); asm volatile ("lcall %1, %2" : "=a" (res) : "i" (MK_SEL(1)), "i" (&code16_func3): "memory", "cc"); printf("func3() = 0x%08x\n", res); } #endif extern char func_lret32; extern char func_iret32; void test_misc(void) { char table[256]; int res, i; #if 0 // REINSTATE for(i=0;i<256;i++) table[i] = 256 - i; res = 0x12345678; asm ("xlat" : "=a" (res) : "b" (table), "0" (res)); printf("xlat: EAX=%08x\n", res); #endif #if 0 // REINSTATE asm volatile ("pushl %%cs ; call %1" : "=a" (res) : "m" (func_lret32): "memory", "cc"); printf("func_lret32=%x\n", res); asm volatile ("pushfl ; pushl %%cs ; call %1" : "=a" (res) : "m" (func_iret32): "memory", "cc"); printf("func_iret32=%x\n", res); #endif /* specific popl test */ asm volatile ("pushl $12345432 ; pushl $0x9abcdef ; popl (%%esp) ; popl %0" : "=g" (res)); printf("popl esp=%x\n", res); #if 0 // REINSTATE /* specific popw test */ asm volatile ("pushl $12345432 ; pushl $0x9abcdef ; popw (%%esp) ; addl $2, %%esp ; popl %0" : "=g" (res)); printf("popw esp=%x\n", res); #endif } uint8_t str_buffer[4096]; #define TEST_STRING1(OP, size, DF, REP)\ {\ int esi, edi, eax, ecx, eflags;\ \ esi = (long)(str_buffer + sizeof(str_buffer) / 2);\ edi = (long)(str_buffer + sizeof(str_buffer) / 2) + 16;\ eax = 0x12345678;\ ecx = 17;\ \ asm volatile ("pushl $0\n\t"\ "popf\n\t"\ DF "\n\t"\ REP #OP size "\n\t"\ "cld\n\t"\ "pushf\n\t"\ "popl %4\n\t"\ : "=S" (esi), "=D" (edi), "=a" (eax), "=c" (ecx), "=g" (eflags)\ : "0" (esi), "1" (edi), "2" (eax), "3" (ecx));\ printf("%-10s ESI=%08x EDI=%08x EAX=%08x ECX=%08x EFL=%04x\n",\ REP #OP size, esi, edi, eax, ecx,\ eflags & (CC_C | CC_P | CC_Z | CC_S | CC_O | CC_A));\ } #define TEST_STRING(OP, REP)\ TEST_STRING1(OP, "b", "", REP);\ TEST_STRING1(OP, "w", "", REP);\ TEST_STRING1(OP, "l", "", REP);\ TEST_STRING1(OP, "b", "std", REP);\ TEST_STRING1(OP, "w", "std", REP);\ TEST_STRING1(OP, "l", "std", REP) void test_string(void) { int i; for(i = 0;i < sizeof(str_buffer); i++) str_buffer[i] = i + 0x56; TEST_STRING(stos, ""); TEST_STRING(stos, "rep "); // REINSTATE: TEST_STRING(lods, ""); /* to verify stos */ // REINSTATE: TEST_STRING(lods, "rep "); TEST_STRING(movs, ""); TEST_STRING(movs, "rep "); // REINSTATE: TEST_STRING(lods, ""); /* to verify stos */ /* XXX: better tests */ TEST_STRING(scas, ""); // REINSTATE: TEST_STRING(scas, "repz "); TEST_STRING(scas, "repnz "); // REINSTATE: TEST_STRING(cmps, ""); TEST_STRING(cmps, "repz "); // REINSTATE: TEST_STRING(cmps, "repnz "); } /* VM86 test */ #if 0 static inline void set_bit(uint8_t *a, unsigned int bit) { a[bit / 8] |= (1 << (bit % 8)); } static inline uint8_t *seg_to_linear(unsigned int seg, unsigned int reg) { return (uint8_t *)((seg << 4) + (reg & 0xffff)); } static inline void pushw(struct vm86_regs *r, int val) { r->esp = (r->esp & ~0xffff) | ((r->esp - 2) & 0xffff); *(uint16_t *)seg_to_linear(r->ss, r->esp) = val; } #undef __syscall_return #define __syscall_return(type, res) \ do { \ return (type) (res); \ } while (0) _syscall2(int, vm86, int, func, struct vm86plus_struct *, v86) extern char vm86_code_start; extern char vm86_code_end; #define VM86_CODE_CS 0x100 #define VM86_CODE_IP 0x100 void test_vm86(void) { struct vm86plus_struct ctx; struct vm86_regs *r; uint8_t *vm86_mem; int seg, ret; vm86_mem = mmap((void *)0x00000000, 0x110000, PROT_WRITE | PROT_READ | PROT_EXEC, MAP_FIXED | MAP_ANON | MAP_PRIVATE, -1, 0); if (vm86_mem == MAP_FAILED) { printf("ERROR: could not map vm86 memory"); return; } memset(&ctx, 0, sizeof(ctx)); /* init basic registers */ r = &ctx.regs; r->eip = VM86_CODE_IP; r->esp = 0xfffe; seg = VM86_CODE_CS; r->cs = seg; r->ss = seg; r->ds = seg; r->es = seg; r->fs = seg; r->gs = seg; r->eflags = VIF_MASK; /* move code to proper address. We use the same layout as a .com dos program. */ memcpy(vm86_mem + (VM86_CODE_CS << 4) + VM86_CODE_IP, &vm86_code_start, &vm86_code_end - &vm86_code_start); /* mark int 0x21 as being emulated */ set_bit((uint8_t *)&ctx.int_revectored, 0x21); for(;;) { ret = vm86(VM86_ENTER, &ctx); switch(VM86_TYPE(ret)) { case VM86_INTx: { int int_num, ah, v; int_num = VM86_ARG(ret); if (int_num != 0x21) goto unknown_int; ah = (r->eax >> 8) & 0xff; switch(ah) { case 0x00: /* exit */ goto the_end; case 0x02: /* write char */ { uint8_t c = r->edx; putchar(c); } break; case 0x09: /* write string */ { uint8_t c, *ptr; ptr = seg_to_linear(r->ds, r->edx); for(;;) { c = *ptr++; if (c == '$') break; putchar(c); } r->eax = (r->eax & ~0xff) | '$'; } break; case 0xff: /* extension: write eflags number in edx */ v = (int)r->edx; #ifndef LINUX_VM86_IOPL_FIX v &= ~0x3000; #endif printf("%08x\n", v); break; default: unknown_int: printf("unsupported int 0x%02x\n", int_num); goto the_end; } } break; case VM86_SIGNAL: /* a signal came, we just ignore that */ break; case VM86_STI: break; default: printf("ERROR: unhandled vm86 return code (0x%x)\n", ret); goto the_end; } } the_end: printf("VM86 end\n"); munmap(vm86_mem, 0x110000); } #endif /* exception tests */ #if 0 #ifndef REG_EAX #define REG_EAX EAX #define REG_EBX EBX #define REG_ECX ECX #define REG_EDX EDX #define REG_ESI ESI #define REG_EDI EDI #define REG_EBP EBP #define REG_ESP ESP #define REG_EIP EIP #define REG_EFL EFL #define REG_TRAPNO TRAPNO #define REG_ERR ERR #endif jmp_buf jmp_env; int v1; int tab[2]; void sig_handler(int sig, siginfo_t *info, void *puc) { struct ucontext *uc = puc; printf("si_signo=%d si_errno=%d si_code=%d", info->si_signo, info->si_errno, info->si_code); printf(" si_addr=0x%08lx", (unsigned long)info->si_addr); printf("\n"); printf("trapno=0x%02x err=0x%08x", uc->uc_mcontext.gregs[REG_TRAPNO], uc->uc_mcontext.gregs[REG_ERR]); printf(" EIP=0x%08x", uc->uc_mcontext.gregs[REG_EIP]); printf("\n"); longjmp(jmp_env, 1); } void test_exceptions(void) { struct modify_ldt_ldt_s ldt; struct sigaction act; volatile int val; act.sa_sigaction = sig_handler; sigemptyset(&act.sa_mask); act.sa_flags = SA_SIGINFO; sigaction(SIGFPE, &act, NULL); sigaction(SIGILL, &act, NULL); sigaction(SIGSEGV, &act, NULL); sigaction(SIGBUS, &act, NULL); sigaction(SIGTRAP, &act, NULL); /* test division by zero reporting */ printf("DIVZ exception:\n"); if (setjmp(jmp_env) == 0) { /* now divide by zero */ v1 = 0; v1 = 2 / v1; } printf("BOUND exception:\n"); if (setjmp(jmp_env) == 0) { /* bound exception */ tab[0] = 1; tab[1] = 10; asm volatile ("bound %0, %1" : : "r" (11), "m" (tab)); } printf("segment exceptions:\n"); if (setjmp(jmp_env) == 0) { /* load an invalid segment */ asm volatile ("movl %0, %%fs" : : "r" ((0x1234 << 3) | 1)); } if (setjmp(jmp_env) == 0) { /* null data segment is valid */ asm volatile ("movl %0, %%fs" : : "r" (3)); /* null stack segment */ asm volatile ("movl %0, %%ss" : : "r" (3)); } ldt.entry_number = 1; ldt.base_addr = (unsigned long)&seg_data1; ldt.limit = (sizeof(seg_data1) + 0xfff) >> 12; ldt.seg_32bit = 1; ldt.contents = MODIFY_LDT_CONTENTS_DATA; ldt.read_exec_only = 0; ldt.limit_in_pages = 1; ldt.seg_not_present = 1; ldt.useable = 1; modify_ldt(1, &ldt, sizeof(ldt)); /* write ldt entry */ if (setjmp(jmp_env) == 0) { /* segment not present */ asm volatile ("movl %0, %%fs" : : "r" (MK_SEL(1))); } /* test SEGV reporting */ printf("PF exception:\n"); if (setjmp(jmp_env) == 0) { val = 1; /* we add a nop to test a weird PC retrieval case */ asm volatile ("nop"); /* now store in an invalid address */ *(char *)0x1234 = 1; } /* test SEGV reporting */ printf("PF exception:\n"); if (setjmp(jmp_env) == 0) { val = 1; /* read from an invalid address */ v1 = *(char *)0x1234; } /* test illegal instruction reporting */ printf("UD2 exception:\n"); if (setjmp(jmp_env) == 0) { /* now execute an invalid instruction */ asm volatile("ud2"); } printf("lock nop exception:\n"); if (setjmp(jmp_env) == 0) { /* now execute an invalid instruction */ asm volatile("lock nop"); } printf("INT exception:\n"); if (setjmp(jmp_env) == 0) { asm volatile ("int $0xfd"); } if (setjmp(jmp_env) == 0) { asm volatile ("int $0x01"); } if (setjmp(jmp_env) == 0) { asm volatile (".byte 0xcd, 0x03"); } if (setjmp(jmp_env) == 0) { asm volatile ("int $0x04"); } if (setjmp(jmp_env) == 0) { asm volatile ("int $0x05"); } printf("INT3 exception:\n"); if (setjmp(jmp_env) == 0) { asm volatile ("int3"); } printf("CLI exception:\n"); if (setjmp(jmp_env) == 0) { asm volatile ("cli"); } printf("STI exception:\n"); if (setjmp(jmp_env) == 0) { asm volatile ("cli"); } printf("INTO exception:\n"); if (setjmp(jmp_env) == 0) { /* overflow exception */ asm volatile ("addl $1, %0 ; into" : : "r" (0x7fffffff)); } printf("OUTB exception:\n"); if (setjmp(jmp_env) == 0) { asm volatile ("outb %%al, %%dx" : : "d" (0x4321), "a" (0)); } printf("INB exception:\n"); if (setjmp(jmp_env) == 0) { asm volatile ("inb %%dx, %%al" : "=a" (val) : "d" (0x4321)); } printf("REP OUTSB exception:\n"); if (setjmp(jmp_env) == 0) { asm volatile ("rep outsb" : : "d" (0x4321), "S" (tab), "c" (1)); } printf("REP INSB exception:\n"); if (setjmp(jmp_env) == 0) { asm volatile ("rep insb" : : "d" (0x4321), "D" (tab), "c" (1)); } printf("HLT exception:\n"); if (setjmp(jmp_env) == 0) { asm volatile ("hlt"); } printf("single step exception:\n"); val = 0; if (setjmp(jmp_env) == 0) { asm volatile ("pushf\n" "orl $0x00100, (%%esp)\n" "popf\n" "movl $0xabcd, %0\n" "movl $0x0, %0\n" : "=m" (val) : : "cc", "memory"); } printf("val=0x%x\n", val); } /* specific precise single step test */ void sig_trap_handler(int sig, siginfo_t *info, void *puc) { struct ucontext *uc = puc; printf("EIP=0x%08x\n", uc->uc_mcontext.gregs[REG_EIP]); } const uint8_t sstep_buf1[4] = { 1, 2, 3, 4}; uint8_t sstep_buf2[4]; void test_single_step(void) { struct sigaction act; volatile int val; int i; val = 0; act.sa_sigaction = sig_trap_handler; sigemptyset(&act.sa_mask); act.sa_flags = SA_SIGINFO; sigaction(SIGTRAP, &act, NULL); asm volatile ("pushf\n" "orl $0x00100, (%%esp)\n" "popf\n" "movl $0xabcd, %0\n" /* jmp test */ "movl $3, %%ecx\n" "1:\n" "addl $1, %0\n" "decl %%ecx\n" "jnz 1b\n" /* movsb: the single step should stop at each movsb iteration */ "movl $sstep_buf1, %%esi\n" "movl $sstep_buf2, %%edi\n" "movl $0, %%ecx\n" "rep movsb\n" "movl $3, %%ecx\n" "rep movsb\n" "movl $1, %%ecx\n" "rep movsb\n" /* cmpsb: the single step should stop at each cmpsb iteration */ "movl $sstep_buf1, %%esi\n" "movl $sstep_buf2, %%edi\n" "movl $0, %%ecx\n" "rep cmpsb\n" "movl $4, %%ecx\n" "rep cmpsb\n" /* getpid() syscall: single step should skip one instruction */ "movl $20, %%eax\n" "int $0x80\n" "movl $0, %%eax\n" /* when modifying SS, trace is not done on the next instruction */ "movl %%ss, %%ecx\n" "movl %%ecx, %%ss\n" "addl $1, %0\n" "movl $1, %%eax\n" "movl %%ecx, %%ss\n" "jmp 1f\n" "addl $1, %0\n" "1:\n" "movl $1, %%eax\n" "pushl %%ecx\n" "popl %%ss\n" "addl $1, %0\n" "movl $1, %%eax\n" "pushf\n" "andl $~0x00100, (%%esp)\n" "popf\n" : "=m" (val) : : "cc", "memory", "eax", "ecx", "esi", "edi"); printf("val=%d\n", val); for(i = 0; i < 4; i++) printf("sstep_buf2[%d] = %d\n", i, sstep_buf2[i]); } /* self modifying code test */ uint8_t code[] = { 0xb8, 0x1, 0x00, 0x00, 0x00, /* movl $1, %eax */ 0xc3, /* ret */ }; asm("smc_code2:\n" "movl 4(%esp), %eax\n" "movl %eax, smc_patch_addr2 + 1\n" "nop\n" "nop\n" "nop\n" "nop\n" "nop\n" "nop\n" "nop\n" "nop\n" "smc_patch_addr2:\n" "movl $1, %eax\n" "ret\n"); typedef int FuncType(void); extern int smc_code2(int); void test_self_modifying_code(void) { int i; printf("self modifying code:\n"); printf("func1 = 0x%x\n", ((FuncType *)code)()); for(i = 2; i <= 4; i++) { code[1] = i; printf("func%d = 0x%x\n", i, ((FuncType *)code)()); } /* more difficult test : the modified code is just after the modifying instruction. It is forbidden in Intel specs, but it is used by old DOS programs */ for(i = 2; i <= 4; i++) { printf("smc_code2(%d) = %d\n", i, smc_code2(i)); } } static void *call_end __init_call = NULL; #endif int main(int argc, char **argv) { void **ptr; void (*func)(void); #if 1 ptr = &call_start + 1; while (*ptr != NULL) { func = *ptr++; func(); } #endif test_bsx(); test_mul(); test_jcc(); test_floats(); //test_bcd(); test_xchg(); test_string(); test_misc(); // REINSTATE test_lea(); // test_segs(); //test_code16(); //test_vm86(); //test_exceptions(); //test_self_modifying_code(); //test_single_step(); return 0; }