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Implemented mechanism for rel32 call

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Maxime Chevalier-Boisvert 2020-10-23 10:59:22 -04:00 committed by Alan Wu
parent 498fe0fb52
commit b761f5c96f
3 changed files with 37 additions and 3 deletions
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36
ujit_asm.c
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@ -758,7 +758,7 @@ void cb_write_jcc_ptr(codeblock_t* cb, const char* mnem, uint8_t op0, uint8_t op
cb_write_byte(cb, op0);
cb_write_byte(cb, op1);
// Pointer to the end of this jump
// Pointer to the end of this jump instruction
uint8_t* end_ptr = &cb->mem_block[cb->write_pos] + 4;
// Compute the jump offset
@ -822,6 +822,40 @@ void and(codeblock_t* cb, x86opnd_t opnd0, x86opnd_t opnd1)
);
}
// call - Call to a pointer with a 32-bit displacement offset
void call_rel32(codeblock_t* cb, int32_t rel32)
{
//cb.writeASM("call", rel32);
// Write the opcode
cb_write_byte(cb, 0xE8);
// Write the relative 32-bit jump offset
cb_write_int(cb, (int32_t)rel32, 32);
}
// call - Call a pointer, encode with a 32-bit offset if possible
void call_ptr(codeblock_t* cb, x86opnd_t scratch_reg, uint8_t* dst_ptr)
{
assert (scratch_reg.type == OPND_REG);
// Pointer to the end of this call instruction
uint8_t* end_ptr = &cb->mem_block[cb->write_pos] + 5;
// Compute the jump offset
int64_t rel64 = (int64_t)(dst_ptr - end_ptr);
// If the offset fits in 32-bit
if (rel64 >= -2147483648 && rel64 <= 2147483647)
{
return call_rel32(cb, (int32_t)rel64);
}
// Move the pointer into the scratch register and call
mov(cb, scratch_reg, const_ptr_opnd(dst_ptr));
call(cb, scratch_reg);
}
/// call - Call to label with 32-bit offset
void call_label(codeblock_t* cb, size_t label_idx)
{

1
ujit_asm.h
View file

@ -254,6 +254,7 @@ void cb_link_labels(codeblock_t* cb);
// Encode individual instructions into a code block
void add(codeblock_t* cb, x86opnd_t opnd0, x86opnd_t opnd1);
void and(codeblock_t* cb, x86opnd_t opnd0, x86opnd_t opnd1);
void call_ptr(codeblock_t* cb, x86opnd_t scratch_reg, uint8_t* dst_ptr);
void call_label(codeblock_t* cb, size_t label_idx);
void call(codeblock_t* cb, x86opnd_t opnd);
void cmova(codeblock_t* cb, x86opnd_t dst, x86opnd_t src);

3
ujit_compile.c
View file

@ -668,8 +668,7 @@ gen_opt_send_without_block(codeblock_t* cb, codeblock_t* ocb, ctx_t* ctx)
// Call the C function
// VALUE ret = (cfunc->func)(recv, argv[0], argv[1]);
mov(cb, REG0, const_ptr_opnd(cfunc->func));
call(cb, REG0);
call_ptr(cb, REG0, cfunc->func);
//print_str(cb, "after C call");