| 1 | // Basic macros to emit ARM instructions and some utils |
| 2 | |
| 3 | // (c) Copyright 2008, Grazvydas "notaz" Ignotas |
| 4 | // Free for non-commercial use. |
| 5 | |
| 6 | #define EMIT(x) *tcache_ptr++ = x |
| 7 | |
| 8 | #define A_R4M (1 << 4) |
| 9 | #define A_R5M (1 << 5) |
| 10 | #define A_R6M (1 << 6) |
| 11 | #define A_R7M (1 << 7) |
| 12 | #define A_R8M (1 << 8) |
| 13 | #define A_R9M (1 << 9) |
| 14 | #define A_R10M (1 << 10) |
| 15 | #define A_R11M (1 << 11) |
| 16 | #define A_R14M (1 << 14) |
| 17 | |
| 18 | #define A_COND_AL 0xe |
| 19 | #define A_COND_EQ 0x0 |
| 20 | #define A_COND_NE 0x1 |
| 21 | #define A_COND_MI 0x4 |
| 22 | #define A_COND_PL 0x5 |
| 23 | #define A_COND_LE 0xd |
| 24 | |
| 25 | /* addressing mode 1 */ |
| 26 | #define A_AM1_LSL 0 |
| 27 | #define A_AM1_LSR 1 |
| 28 | #define A_AM1_ASR 2 |
| 29 | #define A_AM1_ROR 3 |
| 30 | |
| 31 | #define A_AM1_IMM(ror2,imm8) (((ror2)<<8) | (imm8) | 0x02000000) |
| 32 | #define A_AM1_REG_XIMM(shift_imm,shift_op,rm) (((shift_imm)<<7) | ((shift_op)<<5) | (rm)) |
| 33 | #define A_AM1_REG_XREG(rs,shift_op,rm) (((rs)<<8) | ((shift_op)<<5) | 0x10 | (rm)) |
| 34 | |
| 35 | /* data processing op */ |
| 36 | #define A_OP_AND 0x0 |
| 37 | #define A_OP_EOR 0x1 |
| 38 | #define A_OP_SUB 0x2 |
| 39 | #define A_OP_RSB 0x3 |
| 40 | #define A_OP_ADD 0x4 |
| 41 | #define A_OP_TST 0x8 |
| 42 | #define A_OP_CMP 0xa |
| 43 | #define A_OP_ORR 0xc |
| 44 | #define A_OP_MOV 0xd |
| 45 | #define A_OP_BIC 0xe |
| 46 | |
| 47 | #define EOP_C_DOP_X(cond,op,s,rn,rd,shifter_op) \ |
| 48 | EMIT(((cond)<<28) | ((op)<< 21) | ((s)<<20) | ((rn)<<16) | ((rd)<<12) | (shifter_op)) |
| 49 | |
| 50 | #define EOP_C_DOP_IMM( cond,op,s,rn,rd,ror2,imm8) EOP_C_DOP_X(cond,op,s,rn,rd,A_AM1_IMM(ror2,imm8)) |
| 51 | #define EOP_C_DOP_REG_XIMM(cond,op,s,rn,rd,shift_imm,shift_op,rm) EOP_C_DOP_X(cond,op,s,rn,rd,A_AM1_REG_XIMM(shift_imm,shift_op,rm)) |
| 52 | #define EOP_C_DOP_REG_XREG(cond,op,s,rn,rd,rs, shift_op,rm) EOP_C_DOP_X(cond,op,s,rn,rd,A_AM1_REG_XREG(rs, shift_op,rm)) |
| 53 | |
| 54 | #define EOP_MOV_IMM(rd, ror2,imm8) EOP_C_DOP_IMM(A_COND_AL,A_OP_MOV,0, 0,rd,ror2,imm8) |
| 55 | #define EOP_ORR_IMM(rd,rn,ror2,imm8) EOP_C_DOP_IMM(A_COND_AL,A_OP_ORR,0,rn,rd,ror2,imm8) |
| 56 | #define EOP_ADD_IMM(rd,rn,ror2,imm8) EOP_C_DOP_IMM(A_COND_AL,A_OP_ADD,0,rn,rd,ror2,imm8) |
| 57 | #define EOP_BIC_IMM(rd,rn,ror2,imm8) EOP_C_DOP_IMM(A_COND_AL,A_OP_BIC,0,rn,rd,ror2,imm8) |
| 58 | #define EOP_AND_IMM(rd,rn,ror2,imm8) EOP_C_DOP_IMM(A_COND_AL,A_OP_AND,0,rn,rd,ror2,imm8) |
| 59 | #define EOP_SUB_IMM(rd,rn,ror2,imm8) EOP_C_DOP_IMM(A_COND_AL,A_OP_SUB,0,rn,rd,ror2,imm8) |
| 60 | #define EOP_TST_IMM( rn,ror2,imm8) EOP_C_DOP_IMM(A_COND_AL,A_OP_TST,1,rn, 0,ror2,imm8) |
| 61 | #define EOP_CMP_IMM( rn,ror2,imm8) EOP_C_DOP_IMM(A_COND_AL,A_OP_CMP,1,rn, 0,ror2,imm8) |
| 62 | #define EOP_RSB_IMM(rd,rn,ror2,imm8) EOP_C_DOP_IMM(A_COND_AL,A_OP_RSB,0,rn,rd,ror2,imm8) |
| 63 | |
| 64 | #define EOP_MOV_REG(s, rd,shift_imm,shift_op,rm) EOP_C_DOP_REG_XIMM(A_COND_AL,A_OP_MOV,s, 0,rd,shift_imm,shift_op,rm) |
| 65 | #define EOP_ORR_REG(s,rn,rd,shift_imm,shift_op,rm) EOP_C_DOP_REG_XIMM(A_COND_AL,A_OP_ORR,s,rn,rd,shift_imm,shift_op,rm) |
| 66 | #define EOP_ADD_REG(s,rn,rd,shift_imm,shift_op,rm) EOP_C_DOP_REG_XIMM(A_COND_AL,A_OP_ADD,s,rn,rd,shift_imm,shift_op,rm) |
| 67 | #define EOP_TST_REG( rn, shift_imm,shift_op,rm) EOP_C_DOP_REG_XIMM(A_COND_AL,A_OP_TST,1,rn, 0,shift_imm,shift_op,rm) |
| 68 | |
| 69 | #define EOP_MOV_REG2(s, rd,rs,shift_op,rm) EOP_C_DOP_REG_XREG(A_COND_AL,A_OP_MOV,s, 0,rd,rs,shift_op,rm) |
| 70 | #define EOP_ADD_REG2(s,rn,rd,rs,shift_op,rm) EOP_C_DOP_REG_XREG(A_COND_AL,A_OP_ADD,s,rn,rd,rs,shift_op,rm) |
| 71 | #define EOP_SUB_REG2(s,rn,rd,rs,shift_op,rm) EOP_C_DOP_REG_XREG(A_COND_AL,A_OP_SUB,s,rn,rd,rs,shift_op,rm) |
| 72 | |
| 73 | #define EOP_MOV_REG_SIMPLE(rd,rm) EOP_MOV_REG(0,rd,0,A_AM1_LSL,rm) |
| 74 | #define EOP_MOV_REG_LSL(rd, rm,shift_imm) EOP_MOV_REG(0,rd,shift_imm,A_AM1_LSL,rm) |
| 75 | #define EOP_MOV_REG_LSR(rd, rm,shift_imm) EOP_MOV_REG(0,rd,shift_imm,A_AM1_LSR,rm) |
| 76 | #define EOP_MOV_REG_ASR(rd, rm,shift_imm) EOP_MOV_REG(0,rd,shift_imm,A_AM1_ASR,rm) |
| 77 | #define EOP_MOV_REG_ROR(rd, rm,shift_imm) EOP_MOV_REG(0,rd,shift_imm,A_AM1_ROR,rm) |
| 78 | |
| 79 | #define EOP_ORR_REG_SIMPLE(rd,rm) EOP_ORR_REG(0,rd,rd,0,A_AM1_LSL,rm) |
| 80 | #define EOP_ORR_REG_LSL(rd,rn,rm,shift_imm) EOP_ORR_REG(0,rn,rd,shift_imm,A_AM1_LSL,rm) |
| 81 | #define EOP_ORR_REG_LSR(rd,rn,rm,shift_imm) EOP_ORR_REG(0,rn,rd,shift_imm,A_AM1_LSR,rm) |
| 82 | #define EOP_ORR_REG_ASR(rd,rn,rm,shift_imm) EOP_ORR_REG(0,rn,rd,shift_imm,A_AM1_ASR,rm) |
| 83 | #define EOP_ORR_REG_ROR(rd,rn,rm,shift_imm) EOP_ORR_REG(0,rn,rd,shift_imm,A_AM1_ROR,rm) |
| 84 | |
| 85 | #define EOP_ADD_REG_SIMPLE(rd,rm) EOP_ADD_REG(0,rd,rd,0,A_AM1_LSL,rm) |
| 86 | #define EOP_ADD_REG_LSL(rd,rn,rm,shift_imm) EOP_ADD_REG(0,rn,rd,shift_imm,A_AM1_LSL,rm) |
| 87 | #define EOP_ADD_REG_LSR(rd,rn,rm,shift_imm) EOP_ADD_REG(0,rn,rd,shift_imm,A_AM1_LSR,rm) |
| 88 | |
| 89 | #define EOP_TST_REG_SIMPLE(rn,rm) EOP_TST_REG( rn, 0,A_AM1_LSL,rm) |
| 90 | |
| 91 | #define EOP_MOV_REG2_LSL(rd, rm,rs) EOP_MOV_REG2(0, rd,rs,A_AM1_LSL,rm) |
| 92 | #define EOP_MOV_REG2_ROR(rd, rm,rs) EOP_MOV_REG2(0, rd,rs,A_AM1_ROR,rm) |
| 93 | #define EOP_ADD_REG2_LSL(rd,rn,rm,rs) EOP_ADD_REG2(0,rn,rd,rs,A_AM1_LSL,rm) |
| 94 | #define EOP_SUB_REG2_LSL(rd,rn,rm,rs) EOP_SUB_REG2(0,rn,rd,rs,A_AM1_LSL,rm) |
| 95 | |
| 96 | /* addressing mode 2 */ |
| 97 | #define EOP_C_AM2_IMM(cond,u,b,l,rn,rd,offset_12) \ |
| 98 | EMIT(((cond)<<28) | 0x05000000 | ((u)<<23) | ((b)<<22) | ((l)<<20) | ((rn)<<16) | ((rd)<<12) | (offset_12)) |
| 99 | |
| 100 | /* addressing mode 3 */ |
| 101 | #define EOP_C_AM3(cond,u,r,l,rn,rd,s,h,immed_reg) \ |
| 102 | EMIT(((cond)<<28) | 0x01000090 | ((u)<<23) | ((r)<<22) | ((l)<<20) | ((rn)<<16) | ((rd)<<12) | \ |
| 103 | ((s)<<6) | ((h)<<5) | (immed_reg)) |
| 104 | |
| 105 | #define EOP_C_AM3_IMM(cond,u,l,rn,rd,s,h,offset_8) EOP_C_AM3(cond,u,1,l,rn,rd,s,h,(((offset_8)&0xf0)<<4)|((offset_8)&0xf)) |
| 106 | |
| 107 | #define EOP_C_AM3_REG(cond,u,l,rn,rd,s,h,rm) EOP_C_AM3(cond,u,0,l,rn,rd,s,h,rm) |
| 108 | |
| 109 | /* ldr and str */ |
| 110 | #define EOP_LDR_IMM( rd,rn,offset_12) EOP_C_AM2_IMM(A_COND_AL,1,0,1,rn,rd,offset_12) |
| 111 | #define EOP_LDR_NEGIMM(rd,rn,offset_12) EOP_C_AM2_IMM(A_COND_AL,0,0,1,rn,rd,offset_12) |
| 112 | #define EOP_LDR_SIMPLE(rd,rn) EOP_C_AM2_IMM(A_COND_AL,1,0,1,rn,rd,0) |
| 113 | #define EOP_STR_IMM( rd,rn,offset_12) EOP_C_AM2_IMM(A_COND_AL,1,0,0,rn,rd,offset_12) |
| 114 | #define EOP_STR_SIMPLE(rd,rn) EOP_C_AM2_IMM(A_COND_AL,1,0,0,rn,rd,0) |
| 115 | |
| 116 | #define EOP_LDRH_IMM( rd,rn,offset_8) EOP_C_AM3_IMM(A_COND_AL,1,1,rn,rd,0,1,offset_8) |
| 117 | #define EOP_LDRH_SIMPLE(rd,rn) EOP_C_AM3_IMM(A_COND_AL,1,1,rn,rd,0,1,0) |
| 118 | #define EOP_LDRH_REG( rd,rn,rm) EOP_C_AM3_REG(A_COND_AL,1,1,rn,rd,0,1,rm) |
| 119 | #define EOP_STRH_IMM( rd,rn,offset_8) EOP_C_AM3_IMM(A_COND_AL,1,0,rn,rd,0,1,offset_8) |
| 120 | #define EOP_STRH_SIMPLE(rd,rn) EOP_C_AM3_IMM(A_COND_AL,1,0,rn,rd,0,1,0) |
| 121 | #define EOP_STRH_REG( rd,rn,rm) EOP_C_AM3_REG(A_COND_AL,1,0,rn,rd,0,1,rm) |
| 122 | |
| 123 | /* ldm and stm */ |
| 124 | #define EOP_XXM(cond,p,u,s,w,l,rn,list) \ |
| 125 | EMIT(((cond)<<28) | (1<<27) | ((p)<<24) | ((u)<<23) | ((s)<<22) | ((w)<<21) | ((l)<<20) | ((rn)<<16) | (list)) |
| 126 | |
| 127 | #define EOP_STMFD_ST(list) EOP_XXM(A_COND_AL,1,0,0,1,0,13,list) |
| 128 | #define EOP_LDMFD_ST(list) EOP_XXM(A_COND_AL,0,1,0,1,1,13,list) |
| 129 | |
| 130 | /* branches */ |
| 131 | #define EOP_C_BX(cond,rm) \ |
| 132 | EMIT(((cond)<<28) | 0x012fff10 | (rm)) |
| 133 | |
| 134 | #define EOP_BX(rm) EOP_C_BX(A_COND_AL,rm) |
| 135 | |
| 136 | #define EOP_C_B(cond,l,signed_immed_24) \ |
| 137 | EMIT(((cond)<<28) | 0x0a000000 | ((l)<<24) | (signed_immed_24)) |
| 138 | |
| 139 | #define EOP_B( signed_immed_24) EOP_C_B(A_COND_AL,0,signed_immed_24) |
| 140 | #define EOP_BL(signed_immed_24) EOP_C_B(A_COND_AL,1,signed_immed_24) |
| 141 | |
| 142 | /* misc */ |
| 143 | #define EOP_C_MUL(cond,s,rd,rs,rm) \ |
| 144 | EMIT(((cond)<<28) | ((s)<<20) | ((rd)<<16) | ((rs)<<8) | 0x90 | (rm)) |
| 145 | |
| 146 | #define EOP_MUL(rd,rm,rs) EOP_C_MUL(A_COND_AL,0,rd,rs,rm) // note: rd != rm |
| 147 | |
| 148 | #define EOP_C_MRS(cond,rd) \ |
| 149 | EMIT(((cond)<<28) | 0x010f0000 | ((rd)<<12)) |
| 150 | |
| 151 | #define EOP_C_MSR_IMM(cond,ror2,imm) \ |
| 152 | EMIT(((cond)<<28) | 0x0328f000 | ((ror2)<<8) | (imm)) // cpsr_f |
| 153 | |
| 154 | #define EOP_C_MSR_REG(cond,rm) \ |
| 155 | EMIT(((cond)<<28) | 0x0128f000 | (rm)) // cpsr_f |
| 156 | |
| 157 | #define EOP_MRS(rd) EOP_C_MRS(A_COND_AL,rd) |
| 158 | #define EOP_MSR_IMM(ror2,imm) EOP_C_MSR_IMM(A_COND_AL,ror2,imm) |
| 159 | #define EOP_MSR_REG(rm) EOP_C_MSR_REG(A_COND_AL,rm) |
| 160 | |
| 161 | |
| 162 | static void emit_mov_const(int cond, int d, unsigned int val) |
| 163 | { |
| 164 | int need_or = 0; |
| 165 | if (val & 0xff000000) { |
| 166 | EOP_C_DOP_IMM(cond, A_OP_MOV, 0, 0, d, 8/2, (val>>24)&0xff); |
| 167 | need_or = 1; |
| 168 | } |
| 169 | if (val & 0x00ff0000) { |
| 170 | EOP_C_DOP_IMM(cond, need_or ? A_OP_ORR : A_OP_MOV, 0, need_or ? d : 0, d, 16/2, (val>>16)&0xff); |
| 171 | need_or = 1; |
| 172 | } |
| 173 | if (val & 0x0000ff00) { |
| 174 | EOP_C_DOP_IMM(cond, need_or ? A_OP_ORR : A_OP_MOV, 0, need_or ? d : 0, d, 24/2, (val>>8)&0xff); |
| 175 | need_or = 1; |
| 176 | } |
| 177 | if ((val &0x000000ff) || !need_or) |
| 178 | EOP_C_DOP_IMM(cond, need_or ? A_OP_ORR : A_OP_MOV, 0, need_or ? d : 0, d, 0, val&0xff); |
| 179 | } |
| 180 | |
| 181 | static int is_offset_24(int val) |
| 182 | { |
| 183 | if (val >= (int)0xff000000 && val <= 0x00ffffff) return 1; |
| 184 | return 0; |
| 185 | } |
| 186 | |
| 187 | static int emit_xbranch(int cond, void *target, int is_call) |
| 188 | { |
| 189 | int val = (unsigned int *)target - tcache_ptr - 2; |
| 190 | int direct = is_offset_24(val); |
| 191 | u32 *start_ptr = tcache_ptr; |
| 192 | |
| 193 | if (direct) |
| 194 | { |
| 195 | EOP_C_B(cond,is_call,val & 0xffffff); // b, bl target |
| 196 | } |
| 197 | else |
| 198 | { |
| 199 | #ifdef __EPOC32__ |
| 200 | // elprintf(EL_SVP, "emitting indirect jmp %08x->%08x", tcache_ptr, target); |
| 201 | if (is_call) |
| 202 | EOP_ADD_IMM(14,15,0,8); // add lr,pc,#8 |
| 203 | EOP_C_AM2_IMM(cond,1,0,1,15,15,0); // ldrcc pc,[pc] |
| 204 | EOP_MOV_REG_SIMPLE(15,15); // mov pc, pc |
| 205 | EMIT((u32)target); |
| 206 | #else |
| 207 | // should never happen |
| 208 | elprintf(EL_STATUS|EL_SVP|EL_ANOMALY, "indirect jmp %08x->%08x", target, tcache_ptr); |
| 209 | exit(1); |
| 210 | #endif |
| 211 | } |
| 212 | |
| 213 | return tcache_ptr - start_ptr; |
| 214 | } |
| 215 | |
| 216 | static int emit_call(int cond, void *target) |
| 217 | { |
| 218 | return emit_xbranch(cond, target, 1); |
| 219 | } |
| 220 | |
| 221 | static int emit_jump(int cond, void *target) |
| 222 | { |
| 223 | return emit_xbranch(cond, target, 0); |
| 224 | } |
| 225 | |
| 226 | static void handle_caches(void) |
| 227 | { |
| 228 | #ifdef ARM |
| 229 | extern void cache_flush_d_inval_i(const void *start_addr, const void *end_addr); |
| 230 | cache_flush_d_inval_i(tcache, tcache_ptr); |
| 231 | #endif |
| 232 | } |
| 233 | |
| 234 | |