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Added method to align code block write position

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Maxime Chevalier-Boisvert 2020-09-20 14:23:14 -04:00 committed by Alan Wu
parent 30c4237b06
commit c20066b24c
3 changed files with 29 additions and 3 deletions
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26
ujit_asm.c
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@ -138,9 +138,23 @@ void cb_init(codeblock_t* cb, size_t mem_size)
cb->num_refs = 0; cb->num_refs = 0;
} }
/** // Align the current write position to a multiple of bytes
Set the current write position void cb_align_pos(codeblock_t* cb, size_t multiple)
*/ {
// Compute the pointer modulo the given alignment boundary
uint8_t* ptr = &cb->mem_block[cb->write_pos];
size_t rem = ((size_t)ptr) % multiple;
// If the pointer is already aligned, stop
if (rem != 0)
return;
// Pad the pointer by the necessary amount to align it
size_t pad = multiple - rem;
cb->write_pos += pad;
}
// Set the current write position
void cb_set_pos(codeblock_t* cb, size_t pos) void cb_set_pos(codeblock_t* cb, size_t pos)
{ {
assert (pos < cb->mem_size); assert (pos < cb->mem_size);
@ -1469,6 +1483,12 @@ void sub(codeblock_t* cb, x86opnd_t opnd0, x86opnd_t opnd1)
); );
} }
/// Undefined opcode
void ud2(codeblock_t* cb)
{
cb_write_bytes(cb, 2, 0x0F, 0x0B);
}
/// xor - Exclusive bitwise OR /// xor - Exclusive bitwise OR
void xor(codeblock_t* cb, x86opnd_t opnd0, x86opnd_t opnd1) void xor(codeblock_t* cb, x86opnd_t opnd0, x86opnd_t opnd1)
{ {

3
ujit_asm.h
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@ -182,7 +182,9 @@ x86opnd_t imm_opnd(int64_t val);
// Constant pointer operand // Constant pointer operand
x86opnd_t const_ptr_opnd(void* ptr); x86opnd_t const_ptr_opnd(void* ptr);
// Code block methods
void cb_init(codeblock_t* cb, size_t mem_size); void cb_init(codeblock_t* cb, size_t mem_size);
void cb_align_pos(codeblock_t* cb, size_t multiple);
void cb_set_pos(codeblock_t* cb, size_t pos); void cb_set_pos(codeblock_t* cb, size_t pos);
uint8_t* cb_get_ptr(codeblock_t* cb, size_t index); uint8_t* cb_get_ptr(codeblock_t* cb, size_t index);
void cb_write_byte(codeblock_t* cb, uint8_t byte); void cb_write_byte(codeblock_t* cb, uint8_t byte);
@ -283,6 +285,7 @@ void sar(codeblock_t* cb, x86opnd_t opnd0, x86opnd_t opnd1);
void shl(codeblock_t* cb, x86opnd_t opnd0, x86opnd_t opnd1); void shl(codeblock_t* cb, x86opnd_t opnd0, x86opnd_t opnd1);
void shr(codeblock_t* cb, x86opnd_t opnd0, x86opnd_t opnd1); void shr(codeblock_t* cb, x86opnd_t opnd0, x86opnd_t opnd1);
void sub(codeblock_t* cb, x86opnd_t opnd0, x86opnd_t opnd1); void sub(codeblock_t* cb, x86opnd_t opnd0, x86opnd_t opnd1);
void ud2(codeblock_t* cb);
void xor(codeblock_t* cb, x86opnd_t opnd0, x86opnd_t opnd1); void xor(codeblock_t* cb, x86opnd_t opnd0, x86opnd_t opnd1);
#endif #endif

3
ujit_compile.c
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@ -141,6 +141,9 @@ ujit_compile_insn(rb_iseq_t *iseq, unsigned int insn_idx, unsigned int* next_uji
rb_bug("out of executable memory"); rb_bug("out of executable memory");
} }
// Align the current write positon to cache line boundaries
cb_align_pos(cb, 64);
// Get a pointer to the current write position in the code block // Get a pointer to the current write position in the code block
uint8_t *code_ptr = &cb->mem_block[cb->write_pos]; uint8_t *code_ptr = &cb->mem_block[cb->write_pos];
//printf("write pos: %ld\n", cb->write_pos); //printf("write pos: %ld\n", cb->write_pos);