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arm-asm: Add b, bl, bx, blx

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Danny Milosavljevic 2020-12-26 17:19:25 +01:00
parent 3b1f06c3b2
commit b85c3e1595
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2 changed files with 67 additions and 0 deletions
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60
arm-asm.c
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@ -754,6 +754,61 @@ static void asm_single_data_transfer_opcode(TCCState *s1, int token)
}
}
/* Note: almost dupe of encbranch in arm-gen.c */
static uint32_t encbranchoffset(int pos, int addr, int fail)
{
addr-=pos+8;
addr/=4;
if(addr>=0x1000000 || addr<-0x1000000) { // FIXME: Is that correct?
if(fail)
tcc_error("function bigger than 32MB");
return 0;
}
return /*not 0x0A000000|*/(addr&0xffffff);
}
static void asm_branch_opcode(TCCState *s1, int token)
{
int jmp_disp = 0;
Operand op;
parse_operand(s1, &op);
if (op.type == OP_IM32 || op.type == OP_IM8 || op.type == OP_IM8N) {
jmp_disp = encbranchoffset(ind, op.e.v, 0);
if (jmp_disp < -0x800000 || jmp_disp > 0x7fffff) {
tcc_error("branch is too far");
return;
}
}
switch (ARM_INSTRUCTION_GROUP(token)) {
case TOK_ASM_beq:
if (op.type == OP_IM32 || op.type == OP_IM8 || op.type == OP_IM8N)
asm_emit_opcode(token, (0xa << 24) | (jmp_disp & 0xffffff));
else
expect("branch target");
break;
case TOK_ASM_bleq:
if (op.type == OP_IM32 || op.type == OP_IM8 || op.type == OP_IM8N)
asm_emit_opcode(token, (0xb << 24) | (jmp_disp & 0xffffff));
else
expect("branch target");
break;
case TOK_ASM_bxeq:
if (op.type != OP_REG32)
expect("register");
else
asm_emit_opcode(token, (0x12fff1 << 4) | op.reg);
break;
case TOK_ASM_blxeq:
if (op.type != OP_REG32)
expect("register");
else
asm_emit_opcode(token, (0x12fff3 << 4) | op.reg);
break;
default:
expect("branch instruction");
}
}
ST_FUNC void asm_opcode(TCCState *s1, int token)
{
while (token == TOK_LINEFEED) {
@ -787,6 +842,11 @@ ST_FUNC void asm_opcode(TCCState *s1, int token)
return asm_nullary_opcode(token);
case TOK_ASM_swieq:
return asm_unary_opcode(s1, token);
case TOK_ASM_beq:
case TOK_ASM_bleq:
case TOK_ASM_bxeq:
case TOK_ASM_blxeq:
return asm_branch_opcode(s1, token);
case TOK_ASM_clzeq:
case TOK_ASM_sxtbeq:
case TOK_ASM_sxtheq:

7
arm-tok.h
View File

@ -104,6 +104,13 @@
DEF_ASM_CONDED(push)
DEF_ASM_CONDED(pop)
/* branches */
DEF_ASM_CONDED(b)
DEF_ASM_CONDED(bl)
DEF_ASM_CONDED(bx)
DEF_ASM_CONDED(blx)
/* data processing instructions; order is important */
DEF_ASM_CONDED(and)