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jit_defs.c
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jit_defs.c
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/*
Copyright (C) 2008, Parrot Foundation.
$Id$
*/
#include "parrot/parrot.h"
#include "jit_emit.h"
/* HEADERIZER HFILE: none */
/*
* enumerate these mapped registers
* please note that you have to preserve registers in
* Parrot_jit_begin according to the ABI of the architecture
*/
const char intval_map[INT_REGISTERS_TO_MAP] =
{
/* Preserved, we'd have more, but keeping code_start, op_map, interp,
* and the base pointer in registers takes away four, not to mention
* RBP which is used for easier debugging. That's five registers used
* for one reason or another at the moment. I'm not sure if it's worth
* it yet. */
/*
* RAX ISR2
* RDX for idiv, TODO: handle corner cases, i.e. steal i386 code
* RBX for Interp->ctx.bp
* RBP for debugging, can add it to the preserved list
* R12
* R13 for CODE_START
* R14 for OP_MAP
* R15 for INTERP
*/
R12,
#ifndef USE_OP_MAP_AND_CODE_START
R13, R14,
#endif
/* Unpreserved */
RCX, RSI, RDI, R8, R9, R10, RDX
};
const char floatval_map[FLOAT_REGISTERS_TO_MAP] =
{
XMM2, XMM3, XMM4, XMM5, XMM6, XMM7,
XMM8, XMM9, XMM10, XMM11, XMM12, XMM13, XMM14, XMM15
};
/*
* define arch specific details in jit_arch_info
*/
const jit_arch_info arch_info = {
/* CPU <- Parrot reg move functions */
jit_mov_r_mr,
jit_mov_x_mx,
/* Parrot <- CPU reg move functions */
jit_mov_mr_r,
jit_mov_mx_x,
Parrot_jit_dofixup,
(jit_arch_f)0,
{
/* JIT_CODE_FILE */
{
Parrot_jit_begin, /* emit code prologue */
#ifdef USE_OP_MAP_AND_CODE_START
7,
1,
#else
9, /* mapped int */
3, /* preserved int */
#endif
intval_map, /* which ints mapped */
14, /* mapped float */
0, /* preserved float */
floatval_map /* which floats mapped */
},
/* JIT_CODE_SUB */
{
Parrot_jit_begin_sub,
9,
8,
intval_map,
0,
0,
floatval_map
},
/* JIT_CODE_SUB_REGS_ONLY */
{
/*Parrot_jit_begin_sub_regs*/0, /* emit code prologue */
16,
6,
intval_map,
0,
0,
floatval_map
}
}
};
const char div_by_zero[] = "Divide by zero";
const int mxcsr = 0x7fa0; /* Add 6000 to mxcsr */
/*
* emit code that calls a Parrot opcode function
*/
void call_func(Parrot_jit_info_t *jit_info, void *addr) {
if ((long)addr > (long)INT_MAX) {
/* Move the address into our scratch register R11
* We cannot use just the immediate form of call because the address
* will be too large if we're using a shared parrot, but will be ok on
* a static parrot.
*
* This will most likely only be used on shared libraries.
*/
/* Absolute near call to R11 */
emit_mov_r_i(jit_info->native_ptr, R11, addr);
emit_call_r(jit_info->native_ptr, R11);
}
else {
/* Call with an immediate value. Mainly for a static parrot, and
* debugging */
Parrot_jit_newfixup(jit_info);
jit_info->arena.fixups->type = JIT_AMD64CALL;
jit_info->arena.fixups->param.fptr = D2FPTR(addr);
emit_call_i(jit_info->native_ptr, 0xdead);
}
}
/* Jump to RAX, which needs to be set before calling this */
void
Parrot_emit_jump_to_rax(Parrot_jit_info_t *jit_info, Interp *interp)
{
if (!jit_info->objfile) {
#ifdef USE_OP_MAP_AND_CODE_START
/* Get interp->code->base.data */
jit_emit_load_code_start(jit_info->native_ptr);
emit_sub_r_r(jit_info->native_ptr, RAX, CODE_START);
/* Get interp->code->jit_info->arena->op_map */
jit_emit_load_op_map(jit_info->native_ptr);
#else
/* emit code that gets interp->code->base.data */
emit_mov_r_mr(jit_info->native_ptr, RCX, INTERP, (long)offsetof(Interp, code));
emit_mov_r_mr(jit_info->native_ptr, RDX, RCX, (long)offsetof(PackFile_Segment, data));
emit_sub_r_r(jit_info->native_ptr, RAX, RDX);
/* Reuse interp->code in RCX, get interp->code->jit_info->arena->op_map */
emit_mov_r_mr(jit_info->native_ptr, RDX, RCX, (long)offsetof(PackFile_ByteCode, jit_info));
emit_lea_r_mr(jit_info->native_ptr, RDX, RDX, (long)offsetof(Parrot_jit_info_t, arena));
emit_mov_r_mr(jit_info->native_ptr, RDX, RDX, (long)offsetof(Parrot_jit_arena_t, op_map));
#endif
}
/* Base pointer */
emit_mov_r_mr(jit_info->native_ptr, RBX, INTERP, (long)offsetof(Interp, ctx.bp));
#ifdef USE_OP_MAP_AND_CODE_START
emit_jmp_r_r(jit_info->native_ptr, RAX, OP_MAP);
#else
emit_jmp_r_r(jit_info->native_ptr, RAX, RDX);
#endif
}
void
Parrot_jit_normal_op(Parrot_jit_info_t *jit_info,
Interp *interp)
{
int cur_op = *jit_info->cur_op;
static int check;
if (cur_op >= jit_op_count()) {
cur_op = CORE_OPS_wrapper__;
}
/* check every eight ops, could be changed to 16, or 32, or ... */
if ((++check & 0x7) == 0) {
emit_mov_r_i(jit_info->native_ptr, RDI, jit_info->cur_op);
emit_mov_r_r(jit_info->native_ptr, RSI, INTERP);
call_func(jit_info, (void (*)(void))interp->op_func_table[CORE_OPS_check_events]);
}
emit_mov_r_i(jit_info->native_ptr, RDI, jit_info->cur_op);
emit_mov_r_r(jit_info->native_ptr, RSI, INTERP);
call_func(jit_info, (void (*)(void))interp->op_func_table[cur_op]);
}
/*
* emit code for a branching parrot opcode. All cached registers
* need recalculation, as a branch can go into different code segments
* with different code start and different jit_info
*/
void
Parrot_jit_cpcf_op(Parrot_jit_info_t *jit_info,
Interp *interp)
{
Parrot_jit_normal_op(jit_info, interp);
Parrot_emit_jump_to_rax(jit_info, interp);
}
/*
* emit code that might leave the JIT runcore
* see ppc or i386
*/
void
Parrot_jit_restart_op(Parrot_jit_info_t *jit_info,
Interp *interp)
{
char *sav_ptr;
Parrot_jit_normal_op(jit_info, interp);
emit_test_r(jit_info->native_ptr, RAX);
/* Quick fixup, but we know it's 12, anyway it needs to be a byte */
emit_jcc(jit_info->native_ptr, jcc_jnz, 0x00);
sav_ptr = (char *)(jit_info->native_ptr - 1);
/* Parrot_end_jit(jit_info, interp); */
jit_emit_end(jit_info->native_ptr);
*sav_ptr = (char)(jit_info->native_ptr - sav_ptr - 1);
Parrot_emit_jump_to_rax(jit_info, interp);
}
/*
* emit stack frame according to ABI
* preserve mapped registers according to ABI
* load INTERP, OP_MAP, CODE_START, BP registers
* then run the code at pc
*
* the function is called as
* runops(interp, pc)
*
* at runtime
*/
void
Parrot_jit_begin(Parrot_jit_info_t *jit_info,
Interp *interp)
{
jit_emit_stack_frame_enter(jit_info->native_ptr);
/* Saved registers */
/* push rbp
* push rbx
* push r12
* push r13
* push r14
* push r15 */
emit_push_r(jit_info->native_ptr, RBP);
emit_push_r(jit_info->native_ptr, RBX);
emit_push_r(jit_info->native_ptr, R12);
emit_push_r(jit_info->native_ptr, R13);
emit_push_r(jit_info->native_ptr, R14);
emit_push_r(jit_info->native_ptr, R15);
/* When our "function" gets called, RDI will be the interp,
* and RSI will be jit_info->native_ptr */
/* Set R15 to interp */
/* mov r15, rdi */
/* emit_ldmxcsr(jit_info->native_ptr); */
emit_mov_r_r(jit_info->native_ptr, R15, RDI);
emit_mov_r_r(jit_info->native_ptr, RAX, RSI);
Parrot_emit_jump_to_rax(jit_info, interp);
}
/*
* fix up all emitted branches
* see ppc or i386
*/
void
Parrot_jit_dofixup(Parrot_jit_info_t *jit_info,
Interp *interp)
{
Parrot_jit_fixup_t *fixup, *next;
char *fixup_ptr;
fixup = jit_info->arena.fixups;
while (fixup) {
switch (fixup->type) {
case JIT_AMD64BRANCH:
fixup_ptr = Parrot_jit_fixup_target(jit_info, fixup) + 2;
*(int *)(fixup_ptr) =
jit_info->arena.op_map[fixup->param.opcode].offset
- (fixup->native_offset + 6) + fixup->skip;
break;
case JIT_AMD64JUMP:
fixup_ptr = Parrot_jit_fixup_target(jit_info, fixup) + 1;
*(int *)(fixup_ptr) =
jit_info->arena.op_map[fixup->param.opcode].offset
- (fixup->native_offset + 5) + fixup->skip;
break;
case JIT_AMD64CALL:
fixup_ptr = jit_info->arena.start + fixup->native_offset + 1;
*(int *)(fixup_ptr) = (int)(long)fixup->param.fptr -
(int)(long)fixup_ptr - 4;
break;
default:
Parrot_ex_throw_from_c_args(interp, NULL, EXCEPTION_JIT_ERROR,
"Unknown fixup type: %d\n", fixup->type);
}
next = fixup->next;
free(fixup);
fixup = next;
}
jit_info->arena.fixups = NULL;
}
void
Parrot_jit_begin_sub(Parrot_jit_info_t *jit_info,
Interp *interp)
{
/* NOT CALLED CURRENTLY */
}
/*
* define interface functions for register -> parrot register moves
* and v.v.
*/
/* set mem to reg */
void
jit_mov_mx_x(Interp *interp, Parrot_jit_info_t *jit_info,
int base_reg, INTVAL offs, int src_reg)
{
emit_mov_mx_x(jit_info->native_ptr, base_reg, offs, src_reg);
}
void
jit_mov_mr_r(Interp *interp, Parrot_jit_info_t *jit_info,
int base_reg, INTVAL offs, int src_reg)
{
emit_mov_mr_r(jit_info->native_ptr, base_reg, offs, src_reg);
}
/* set reg to mem */
void
jit_mov_x_mx(Interp *interp, Parrot_jit_info_t *jit_info,
int dst_reg, int base_reg, INTVAL offs)
{
emit_mov_x_mx(jit_info->native_ptr, dst_reg, base_reg, offs);
}
void
jit_mov_r_mr(Interp *interp, Parrot_jit_info_t *jit_info,
int dst_reg, int base_reg, INTVAL offs)
{
emit_mov_r_mr(jit_info->native_ptr, dst_reg, base_reg, offs);
}
const jit_arch_info *
Parrot_jit_init(Interp *interp)
{
return &arch_info;
}
/*
* Local variables:
* c-file-style: "parrot"
* End:
* vim: expandtab shiftwidth=4:
*/