Pico/carthw/svp/gen_arm.c

   1 #define EMIT(x) *tcache_ptr++ = x
   2
   3 #define A_R14M (1 << 14)
   4
   5 #define A_COND_AL 0xe
   6
   7 /* addressing mode 1 */
   8 #define A_AM1_LSL 0
   9 #define A_AM1_LSR 1
  10 #define A_AM1_ASR 2
  11 #define A_AM1_ROR 3
  12
  13 #define A_AM1_IMM(ror2,imm8)                  (((ror2)<<8) | (imm8) | 0x02000000)
  14 #define A_AM1_REG_XIMM(shift_imm,shift_op,rm) (((shift_imm)<<7) | ((shift_op)<<5) | (rm))
  15
  16 /* data processing op */
  17 #define A_OP_ORR 0xc
  18 #define A_OP_MOV 0xd
  19
  20 #define EOP_C_DOP_X(cond,op,s,rn,rd,shifter_op) \
  21         EMIT(((cond)<<28) | ((op)<< 21) | ((s)<<20) | ((rn)<<16) | ((rd)<<12) | (shifter_op))
  22
  23 #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))
  24 #define EOP_C_DOP_REG(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))
  25
  26 #define EOP_MOV_IMM(s,   rd,ror2,imm8) EOP_C_DOP_IMM(A_COND_AL,A_OP_MOV,s, 0,rd,ror2,imm8)
  27 #define EOP_ORR_IMM(s,rn,rd,ror2,imm8) EOP_C_DOP_IMM(A_COND_AL,A_OP_ORR,s,rn,rd,ror2,imm8)
  28
  29 #define EOP_MOV_REG(s,   rd,shift_imm,shift_op,rm) EOP_C_DOP_REG(A_COND_AL,A_OP_MOV,s, 0,rd,shift_imm,shift_op,rm)
  30
  31 #define EOP_MOV_REG_SIMPLE(rd,rm) EOP_MOV_REG(0,rd,0,A_AM1_LSL,rm)
  32
  33 /* ldr and str */
  34 #define EOP_C_XXR_IMM(cond,u,b,l,rn,rd,offset_12) \
  35         EMIT(((cond)<<28) | 0x05000000 | ((u)<<23) | ((b)<<22) | ((l)<<20) | ((rn)<<16) | ((rd)<<12) | (offset_12))
  36
  37 #define EOP_LDR_IMM(   rd,rn,offset_12) EOP_C_XXR_IMM(A_COND_AL,1,0,1,rn,rd,offset_12)
  38 #define EOP_LDR_NEGIMM(rd,rn,offset_12) EOP_C_XXR_IMM(A_COND_AL,0,0,1,rn,rd,offset_12)
  39 #define EOP_LDR_SIMPLE(rd,rn)           EOP_C_XXR_IMM(A_COND_AL,1,0,1,rn,rd,0)
  40 #define EOP_STR_SIMPLE(rd,rn)           EOP_C_XXR_IMM(A_COND_AL,1,0,0,rn,rd,0)
  41
  42 /* ldm and stm */
  43 #define EOP_XXM(cond,p,u,s,w,l,rn,list) \
  44         EMIT(((cond)<<28) | (1<<27) | ((p)<<24) | ((u)<<23) | ((s)<<22) | ((w)<<21) | ((l)<<20) | ((rn)<<16) | (list))
  45
  46 #define EOP_STMFD_ST(list) EOP_XXM(A_COND_AL,1,0,0,1,0,13,list)
  47 #define EOP_LDMFD_ST(list) EOP_XXM(A_COND_AL,0,1,0,1,1,13,list)
  48
  49 /* branches */
  50 #define EOP_C_BX(cond,rm) \
  51         EMIT(((cond)<<28) | 0x012fff10 | (rm))
  52
  53 #define EOP_BX(rm) EOP_C_BX(A_COND_AL,rm)
  54
  55
  56 static void emit_mov_const(int d, unsigned int val)
  57 {
  58         int need_or = 0;
  59         if (val & 0xff000000) {
  60                 EOP_MOV_IMM(0, d,  8/2, (val>>24)&0xff);
  61                 need_or = 1;
  62         }
  63         if (val & 0x00ff0000) {
  64                 EOP_C_DOP_IMM(A_COND_AL,need_or ? A_OP_ORR : A_OP_MOV, 0, need_or ? d : 0, d, 16/2, (val>>16)&0xff);
  65                 need_or = 1;
  66         }
  67         if (val & 0x0000ff00) {
  68                 EOP_C_DOP_IMM(A_COND_AL,need_or ? A_OP_ORR : A_OP_MOV, 0, need_or ? d : 0, d, 24/2, (val>>8)&0xff);
  69                 need_or = 1;
  70         }
  71         if ((val &0x000000ff) || !need_or)
  72                 EOP_C_DOP_IMM(A_COND_AL,need_or ? A_OP_ORR : A_OP_MOV, 0, need_or ? d : 0, d, 0, val&0xff);
  73 }
  74
  75 static void check_offset_12(unsigned int val)
  76 {
  77         if (!(val & ~0xfff)) return;
  78         printf("offset_12 overflow %04x\n", val);
  79         exit(1);
  80 }
  81
  82 static void emit_block_prologue(void)
  83 {
  84         // stack LR
  85         EOP_STMFD_ST(A_R14M);                   // stmfd r13!, {r14}
  86 }
  87
  88 static void emit_block_epilogue(unsigned int *block_start, int icount)
  89 {
  90         int back = (tcache_ptr - block_start) + 2;
  91         back += 3; // g_cycles
  92         check_offset_12(back<<2);
  93
  94         EOP_LDR_NEGIMM(2,15,back<<2);           // ldr r2,[pc,#back]
  95         emit_mov_const(3, icount);
  96         EOP_STR_SIMPLE(3,2);                    // str r3,[r2]
  97
  98         EOP_LDMFD_ST(A_R14M);                   // ldmfd r13!, {r14}
  99         EOP_BX(14);                             // bx r14
 100 }
 101
 102 static void emit_pc_inc(unsigned int *block_start, int pc)
 103 {
 104         int back = (tcache_ptr - block_start) + 2;
 105         back += 2; // rPC ptr
 106         check_offset_12(back<<2);
 107
 108         EOP_LDR_NEGIMM(2,15,back<<2);           // ldr r2,[pc,#back]
 109         emit_mov_const(3, pc<<16);
 110         EOP_STR_SIMPLE(3,2);                    // str r3,[r2]
 111 }
 112
 113 static void emit_call(unsigned int *block_start, unsigned int op1)
 114 {
 115         int back = (tcache_ptr - block_start) + 2;
 116         back += 1; // func table
 117         check_offset_12(back<<2);
 118
 119         EOP_LDR_NEGIMM(2,15,back<<2);           // ldr r2,[pc,#back]
 120         EOP_MOV_REG_SIMPLE(14,15);              // mov lr,pc
 121         EOP_LDR_IMM(15,2,op1<<2);               // ldr pc,[r2,#op1]
 122 }
 123
 124 static void handle_caches()
 125 {
 126 #ifdef ARM
 127         extern void flush_inval_caches(const void *start_addr, const void *end_addr);
 128         flush_inval_caches(tcache, tcache_ptr);
 129 #else
 130 #error wth
 131 #endif
 132 }
 133
 134