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arm-asm: Implement branch to label

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Danny Milosavljevic 2021-01-04 23:26:24 +01:00 committed by Ramsay Jones
parent 29d8871d61
commit 54ef167111
1 changed files with 19 additions and 15 deletions
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34
arm-asm.c
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@ -1058,9 +1058,9 @@ static uint32_t encbranchoffset(int pos, int addr, int fail)
{ {
addr-=pos+8; addr-=pos+8;
addr/=4; addr/=4;
if(addr>=0x1000000 || addr<-0x1000000) { // FIXME: Is that correct? if(addr>=0x7fffff || addr<-0x800000) {
if(fail) if(fail)
tcc_error("function bigger than 32MB"); tcc_error("branch offset is too far");
return 0; return 0;
} }
return /*not 0x0A000000|*/(addr&0xffffff); return /*not 0x0A000000|*/(addr&0xffffff);
@ -1070,26 +1070,30 @@ static void asm_branch_opcode(TCCState *s1, int token)
{ {
int jmp_disp = 0; int jmp_disp = 0;
Operand op; Operand op;
parse_operand(s1, &op); ExprValue e;
if (op.type == OP_IM32 || op.type == OP_IM8 || op.type == OP_IM8N) { ElfSym *esym;
jmp_disp = encbranchoffset(ind, op.e.v, 0);
if (jmp_disp < -0x800000 || jmp_disp > 0x7fffff) { switch (ARM_INSTRUCTION_GROUP(token)) {
tcc_error("branch is too far"); case TOK_ASM_beq:
case TOK_ASM_bleq:
asm_expr(s1, &e);
esym = elfsym(e.sym);
if (!esym || esym->st_shndx != cur_text_section->sh_num) {
tcc_error("invalid branch target");
return; return;
} }
jmp_disp = encbranchoffset(ind, e.v + esym->st_value, 1);
break;
default:
parse_operand(s1, &op);
break;
} }
switch (ARM_INSTRUCTION_GROUP(token)) { switch (ARM_INSTRUCTION_GROUP(token)) {
case TOK_ASM_beq: 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));
asm_emit_opcode(token, (0xa << 24) | (jmp_disp & 0xffffff));
else
expect("branch target");
break; break;
case TOK_ASM_bleq: 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));
asm_emit_opcode(token, (0xb << 24) | (jmp_disp & 0xffffff));
else
expect("branch target");
break; break;
case TOK_ASM_bxeq: case TOK_ASM_bxeq:
if (op.type != OP_REG32) if (op.type != OP_REG32)