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_const16(int d, unsigned int val)
  57 {
  58         int need_or = 0;
  59         if (val & 0xff00) {
  60                 EOP_MOV_IMM(0, d, 24/2, (val>>8)&0xff);
  61                 need_or = 1;
  62         }
  63         if ((val & 0xff) || !need_or)
  64                 EOP_C_DOP_IMM(A_COND_AL,need_or ? A_OP_ORR : A_OP_MOV, 0, d, d, 0, val&0xff);
  65 }
  66
  67 static void emit_block_prologue(void)
  68 {
  69         // stack LR
  70         EOP_STMFD_ST(A_R14M);                   // stmfd r13!, {r14}
  71 }
  72
  73 static void emit_block_epilogue(unsigned int *block_start, int icount)
  74 {
  75         int back = (tcache_ptr - block_start) + 2;
  76         back += 3; // g_cycles
  77         EOP_LDR_NEGIMM(2,15,back<<2);           // ldr r2,[pc,#back]
  78         emit_mov_const16(3, icount);
  79         EOP_STR_SIMPLE(3,2);                    // str r3,[r2]
  80
  81         EOP_LDMFD_ST(A_R14M);                   // ldmfd r13!, {r14}
  82         EOP_BX(14);                             // bx r14
  83 }
  84
  85 static void emit_pc_inc(unsigned int *block_start, int pc)
  86 {
  87         int back = (tcache_ptr - block_start) + 2;
  88         back += 2; // rPC ptr
  89         EOP_LDR_NEGIMM(2,15,back<<2);           // ldr r2,[pc,#back]
  90         emit_mov_const16(3, pc);
  91         EOP_STR_SIMPLE(3,2);                    // str r3,[r2]
  92 }
  93
  94 static void emit_call(unsigned int *block_start, unsigned int op1)
  95 {
  96         int back = (tcache_ptr - block_start) + 2;
  97         back += 1; // func table
  98         EOP_LDR_NEGIMM(2,15,back<<2);           // ldr r2,[pc,#back]
  99         EOP_MOV_REG_SIMPLE(14,15);              // mov lr,pc
 100         EOP_LDR_IMM(15,2,op1<<2);               // ldr pc,[r2,#op1]
 101 }
 102
 103