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x86_64-gen.c
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x86_64-gen.c
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/*
* x86-64 code generator for TCC
*
* Copyright (c) 2008 Shinichiro Hamaji
*
* Based on i386-gen.c by Fabrice Bellard
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifdef TARGET_DEFS_ONLY
/* number of available registers */
#define NB_REGS 25
#define NB_ASM_REGS 16
#define CONFIG_TCC_ASM
/* a register can belong to several classes. The classes must be
sorted from more general to more precise (see gv2() code which does
assumptions on it). */
#define RC_INT 0x0001 /* generic integer register */
#define RC_FLOAT 0x0002 /* generic float register */
#define RC_RAX 0x0004
#define RC_RDX 0x0008
#define RC_RCX 0x0010
#define RC_RSI 0x0020
#define RC_RDI 0x0040
#define RC_ST0 0x0080 /* only for long double */
#define RC_R8 0x0100
#define RC_R9 0x0200
#define RC_R10 0x0400
#define RC_R11 0x0800
#define RC_XMM0 0x1000
#define RC_XMM1 0x2000
#define RC_XMM2 0x4000
#define RC_XMM3 0x8000
#define RC_XMM4 0x10000
#define RC_XMM5 0x20000
#define RC_XMM6 0x40000
#define RC_XMM7 0x80000
#define RC_IRET RC_RAX /* function return: integer register */
#define RC_IRE2 RC_RDX /* function return: second integer register */
#define RC_FRET RC_XMM0 /* function return: float register */
#define RC_FRE2 RC_XMM1 /* function return: second float register */
/* pretty names for the registers */
enum {
TREG_RAX = 0,
TREG_RCX = 1,
TREG_RDX = 2,
TREG_RSP = 4,
TREG_RSI = 6,
TREG_RDI = 7,
TREG_R8 = 8,
TREG_R9 = 9,
TREG_R10 = 10,
TREG_R11 = 11,
TREG_XMM0 = 16,
TREG_XMM1 = 17,
TREG_XMM2 = 18,
TREG_XMM3 = 19,
TREG_XMM4 = 20,
TREG_XMM5 = 21,
TREG_XMM6 = 22,
TREG_XMM7 = 23,
TREG_ST0 = 24,
TREG_MEM = 0x20
};
#define REX_BASE(reg) (((reg) >> 3) & 1)
#define REG_VALUE(reg) ((reg) & 7)
/* return registers for function */
#define REG_IRET TREG_RAX /* single word int return register */
#define REG_IRE2 TREG_RDX /* second word return register (for long long) */
#define REG_FRET TREG_XMM0 /* float return register */
#define REG_FRE2 TREG_XMM1 /* second float return register */
/* defined if function parameters must be evaluated in reverse order */
#define INVERT_FUNC_PARAMS
/* pointer size, in bytes */
#define PTR_SIZE 8
/* long double size and alignment, in bytes */
#define LDOUBLE_SIZE 16
#define LDOUBLE_ALIGN 16
/* maximum alignment (for aligned attribute support) */
#define MAX_ALIGN 16
/* define if return values need to be extended explicitely
at caller side (for interfacing with non-TCC compilers) */
#define PROMOTE_RET
#define TCC_TARGET_NATIVE_STRUCT_COPY
ST_FUNC void gen_struct_copy(int size);
/******************************************************/
#else /* ! TARGET_DEFS_ONLY */
/******************************************************/
#define USING_GLOBALS
#include "tcc.h"
#include <assert.h>
ST_DATA const char * const target_machine_defs =
"__x86_64__\0"
"__amd64__\0"
;
ST_DATA const int reg_classes[NB_REGS] = {
/* eax */ RC_INT | RC_RAX,
/* ecx */ RC_INT | RC_RCX,
/* edx */ RC_INT | RC_RDX,
0,
0,
0,
RC_RSI,
RC_RDI,
RC_R8,
RC_R9,
RC_R10,
RC_R11,
0,
0,
0,
0,
/* xmm0 */ RC_FLOAT | RC_XMM0,
/* xmm1 */ RC_FLOAT | RC_XMM1,
/* xmm2 */ RC_FLOAT | RC_XMM2,
/* xmm3 */ RC_FLOAT | RC_XMM3,
/* xmm4 */ RC_FLOAT | RC_XMM4,
/* xmm5 */ RC_FLOAT | RC_XMM5,
/* xmm6 an xmm7 are included so gv() can be used on them,
but they are not tagged with RC_FLOAT because they are
callee saved on Windows */
RC_XMM6,
RC_XMM7,
/* st0 */ RC_ST0
};
static unsigned long func_sub_sp_offset;
static int func_ret_sub;
#if defined(CONFIG_TCC_BCHECK)
static addr_t func_bound_offset;
static unsigned long func_bound_ind;
ST_DATA int func_bound_add_epilog;
#endif
#ifdef TCC_TARGET_PE
static int func_scratch, func_alloca;
#endif
/* XXX: make it faster ? */
ST_FUNC void g(int c)
{
int ind1;
if (nocode_wanted)
return;
ind1 = ind + 1;
if (ind1 > cur_text_section->data_allocated)
section_realloc(cur_text_section, ind1);
cur_text_section->data[ind] = c;
ind = ind1;
}
ST_FUNC void o(unsigned int c)
{
while (c) {
g(c);
c = c >> 8;
}
}
ST_FUNC void gen_le16(int v)
{
g(v);
g(v >> 8);
}
ST_FUNC void gen_le32(int c)
{
g(c);
g(c >> 8);
g(c >> 16);
g(c >> 24);
}
ST_FUNC void gen_le64(int64_t c)
{
g(c);
g(c >> 8);
g(c >> 16);
g(c >> 24);
g(c >> 32);
g(c >> 40);
g(c >> 48);
g(c >> 56);
}
static void orex(int ll, int r, int r2, int b)
{
if ((r & VT_VALMASK) >= VT_CONST)
r = 0;
if ((r2 & VT_VALMASK) >= VT_CONST)
r2 = 0;
if (ll || REX_BASE(r) || REX_BASE(r2))
o(0x40 | REX_BASE(r) | (REX_BASE(r2) << 2) | (ll << 3));
o(b);
}
/* output a symbol and patch all calls to it */
ST_FUNC void gsym_addr(int t, int a)
{
while (t) {
unsigned char *ptr = cur_text_section->data + t;
uint32_t n = read32le(ptr); /* next value */
write32le(ptr, a < 0 ? -a : a - t - 4);
t = n;
}
}
static int is64_type(int t)
{
return ((t & VT_BTYPE) == VT_PTR ||
(t & VT_BTYPE) == VT_FUNC ||
(t & VT_BTYPE) == VT_LLONG);
}
/* instruction + 4 bytes data. Return the address of the data */
static int oad(int c, int s)
{
int t;
if (nocode_wanted)
return s;
o(c);
t = ind;
gen_le32(s);
return t;
}
/* generate jmp to a label */
#define gjmp2(instr,lbl) oad(instr,lbl)
ST_FUNC void gen_addr32(int r, Sym *sym, int c)
{
if (r & VT_SYM)
greloca(cur_text_section, sym, ind, R_X86_64_32S, c), c=0;
gen_le32(c);
}
/* output constant with relocation if 'r & VT_SYM' is true */
ST_FUNC void gen_addr64(int r, Sym *sym, int64_t c)
{
if (r & VT_SYM)
greloca(cur_text_section, sym, ind, R_X86_64_64, c), c=0;
gen_le64(c);
}
/* output constant with relocation if 'r & VT_SYM' is true */
ST_FUNC void gen_addrpc32(int r, Sym *sym, int c)
{
if (r & VT_SYM)
greloca(cur_text_section, sym, ind, R_X86_64_PC32, c-4), c=4;
gen_le32(c-4);
}
/* output got address with relocation */
static void gen_gotpcrel(int r, Sym *sym, int c)
{
#ifdef TCC_TARGET_PE
tcc_error("internal error: no GOT on PE: %s %x %x | %02x %02x %02x\n",
get_tok_str(sym->v, NULL), c, r,
cur_text_section->data[ind-3],
cur_text_section->data[ind-2],
cur_text_section->data[ind-1]
);
#endif
greloca(cur_text_section, sym, ind, R_X86_64_GOTPCREL, -4);
gen_le32(0);
if (c) {
/* we use add c, %xxx for displacement */
orex(1, r, 0, 0x81);
o(0xc0 + REG_VALUE(r));
gen_le32(c);
}
}
static void gen_modrm_impl(int op_reg, int r, Sym *sym, int c, int is_got)
{
op_reg = REG_VALUE(op_reg) << 3;
if ((r & VT_VALMASK) == VT_CONST) {
/* constant memory reference */
if (!(r & VT_SYM)) {
/* Absolute memory reference */
o(0x04 | op_reg); /* [sib] | destreg */
oad(0x25, c); /* disp32 */
} else {
o(0x05 | op_reg); /* (%rip)+disp32 | destreg */
if (is_got) {
gen_gotpcrel(r, sym, c);
} else {
gen_addrpc32(r, sym, c);
}
}
} else if ((r & VT_VALMASK) == VT_LOCAL) {
/* currently, we use only ebp as base */
if (c == (char)c) {
/* short reference */
o(0x45 | op_reg);
g(c);
} else {
oad(0x85 | op_reg, c);
}
} else if ((r & VT_VALMASK) >= TREG_MEM) {
if (c) {
g(0x80 | op_reg | REG_VALUE(r));
gen_le32(c);
} else {
g(0x00 | op_reg | REG_VALUE(r));
}
} else {
g(0x00 | op_reg | REG_VALUE(r));
}
}
/* generate a modrm reference. 'op_reg' contains the additional 3
opcode bits */
static void gen_modrm(int op_reg, int r, Sym *sym, int c)
{
gen_modrm_impl(op_reg, r, sym, c, 0);
}
/* generate a modrm reference. 'op_reg' contains the additional 3
opcode bits */
static void gen_modrm64(int opcode, int op_reg, int r, Sym *sym, int c)
{
int is_got;
is_got = (op_reg & TREG_MEM) && !(sym->type.t & VT_STATIC);
orex(1, r, op_reg, opcode);
gen_modrm_impl(op_reg, r, sym, c, is_got);
}
/* load 'r' from value 'sv' */
void load(int r, SValue *sv)
{
int v, t, ft, fc, fr;
SValue v1;
#ifdef TCC_TARGET_PE
SValue v2;
sv = pe_getimport(sv, &v2);
#endif
fr = sv->r;
ft = sv->type.t & ~VT_DEFSIGN;
fc = sv->c.i;
if (fc != sv->c.i && (fr & VT_SYM))
tcc_error("64 bit addend in load");
ft &= ~(VT_VOLATILE | VT_CONSTANT);
#ifndef TCC_TARGET_PE
/* we use indirect access via got */
if ((fr & VT_VALMASK) == VT_CONST && (fr & VT_SYM) &&
(fr & VT_LVAL) && !(sv->sym->type.t & VT_STATIC)) {
/* use the result register as a temporal register */
int tr = r | TREG_MEM;
if (is_float(ft)) {
/* we cannot use float registers as a temporal register */
tr = get_reg(RC_INT) | TREG_MEM;
}
gen_modrm64(0x8b, tr, fr, sv->sym, 0);
/* load from the temporal register */
fr = tr | VT_LVAL;
}
#endif
v = fr & VT_VALMASK;
if (fr & VT_LVAL) {
int b, ll;
if (v == VT_LLOCAL) {
v1.type.t = VT_PTR;
v1.r = VT_LOCAL | VT_LVAL;
v1.c.i = fc;
fr = r;
if (!(reg_classes[fr] & (RC_INT|RC_R11)))
fr = get_reg(RC_INT);
load(fr, &v1);
}
if (fc != sv->c.i) {
/* If the addends doesn't fit into a 32bit signed
we must use a 64bit move. We've checked above
that this doesn't have a sym associated. */
v1.type.t = VT_LLONG;
v1.r = VT_CONST;
v1.c.i = sv->c.i;
fr = r;
if (!(reg_classes[fr] & (RC_INT|RC_R11)))
fr = get_reg(RC_INT);
load(fr, &v1);
fc = 0;
}
ll = 0;
/* Like GCC we can load from small enough properly sized
structs and unions as well.
XXX maybe move to generic operand handling, but should
occur only with asm, so tccasm.c might also be a better place */
if ((ft & VT_BTYPE) == VT_STRUCT) {
int align;
switch (type_size(&sv->type, &align)) {
case 1: ft = VT_BYTE; break;
case 2: ft = VT_SHORT; break;
case 4: ft = VT_INT; break;
case 8: ft = VT_LLONG; break;
default:
tcc_error("invalid aggregate type for register load");
break;
}
}
if ((ft & VT_BTYPE) == VT_FLOAT) {
b = 0x6e0f66;
r = REG_VALUE(r); /* movd */
} else if ((ft & VT_BTYPE) == VT_DOUBLE) {
b = 0x7e0ff3; /* movq */
r = REG_VALUE(r);
} else if ((ft & VT_BTYPE) == VT_LDOUBLE) {
b = 0xdb, r = 5; /* fldt */
} else if ((ft & VT_TYPE) == VT_BYTE || (ft & VT_TYPE) == VT_BOOL) {
b = 0xbe0f; /* movsbl */
} else if ((ft & VT_TYPE) == (VT_BYTE | VT_UNSIGNED)) {
b = 0xb60f; /* movzbl */
} else if ((ft & VT_TYPE) == VT_SHORT) {
b = 0xbf0f; /* movswl */
} else if ((ft & VT_TYPE) == (VT_SHORT | VT_UNSIGNED)) {
b = 0xb70f; /* movzwl */
} else if ((ft & VT_TYPE) == (VT_VOID)) {
/* Can happen with zero size structs */
return;
} else {
assert(((ft & VT_BTYPE) == VT_INT)
|| ((ft & VT_BTYPE) == VT_LLONG)
|| ((ft & VT_BTYPE) == VT_PTR)
|| ((ft & VT_BTYPE) == VT_FUNC)
);
ll = is64_type(ft);
b = 0x8b;
}
if (ll) {
gen_modrm64(b, r, fr, sv->sym, fc);
} else {
orex(ll, fr, r, b);
gen_modrm(r, fr, sv->sym, fc);
}
} else {
if (v == VT_CONST) {
if (fr & VT_SYM) {
#ifdef TCC_TARGET_PE
orex(1,0,r,0x8d);
o(0x05 + REG_VALUE(r) * 8); /* lea xx(%rip), r */
gen_addrpc32(fr, sv->sym, fc);
#else
if (sv->sym->type.t & VT_STATIC) {
orex(1,0,r,0x8d);
o(0x05 + REG_VALUE(r) * 8); /* lea xx(%rip), r */
gen_addrpc32(fr, sv->sym, fc);
} else {
orex(1,0,r,0x8b);
o(0x05 + REG_VALUE(r) * 8); /* mov xx(%rip), r */
gen_gotpcrel(r, sv->sym, fc);
}
#endif
} else if (is64_type(ft)) {
orex(1,r,0, 0xb8 + REG_VALUE(r)); /* mov $xx, r */
gen_le64(sv->c.i);
} else {
orex(0,r,0, 0xb8 + REG_VALUE(r)); /* mov $xx, r */
gen_le32(fc);
}
} else if (v == VT_LOCAL) {
orex(1,0,r,0x8d); /* lea xxx(%ebp), r */
gen_modrm(r, VT_LOCAL, sv->sym, fc);
} else if (v == VT_CMP) {
if (fc & 0x100)
{
v = vtop->cmp_r;
fc &= ~0x100;
/* This was a float compare. If the parity bit is
set the result was unordered, meaning false for everything
except TOK_NE, and true for TOK_NE. */
orex(0, r, 0, 0xb0 + REG_VALUE(r)); /* mov $0/1,%al */
g(v ^ fc ^ (v == TOK_NE));
o(0x037a + (REX_BASE(r) << 8));
}
orex(0,r,0, 0x0f); /* setxx %br */
o(fc);
o(0xc0 + REG_VALUE(r));
orex(0,r,0, 0x0f);
o(0xc0b6 + REG_VALUE(r) * 0x900); /* movzbl %al, %eax */
} else if (v == VT_JMP || v == VT_JMPI) {
t = v & 1;
orex(0,r,0,0);
oad(0xb8 + REG_VALUE(r), t); /* mov $1, r */
o(0x05eb + (REX_BASE(r) << 8)); /* jmp after */
gsym(fc);
orex(0,r,0,0);
oad(0xb8 + REG_VALUE(r), t ^ 1); /* mov $0, r */
} else if (v != r) {
if ((r >= TREG_XMM0) && (r <= TREG_XMM7)) {
if (v == TREG_ST0) {
/* gen_cvt_ftof(VT_DOUBLE); */
o(0xf0245cdd); /* fstpl -0x10(%rsp) */
/* movsd -0x10(%rsp),%xmmN */
o(0x100ff2);
o(0x44 + REG_VALUE(r)*8); /* %xmmN */
o(0xf024);
} else {
assert((v >= TREG_XMM0) && (v <= TREG_XMM7));
if ((ft & VT_BTYPE) == VT_FLOAT) {
o(0x100ff3);
} else {
assert((ft & VT_BTYPE) == VT_DOUBLE);
o(0x100ff2);
}
o(0xc0 + REG_VALUE(v) + REG_VALUE(r)*8);
}
} else if (r == TREG_ST0) {
assert((v >= TREG_XMM0) && (v <= TREG_XMM7));
/* gen_cvt_ftof(VT_LDOUBLE); */
/* movsd %xmmN,-0x10(%rsp) */
o(0x110ff2);
o(0x44 + REG_VALUE(r)*8); /* %xmmN */
o(0xf024);
o(0xf02444dd); /* fldl -0x10(%rsp) */
} else {
orex(is64_type(ft), r, v, 0x89);
o(0xc0 + REG_VALUE(r) + REG_VALUE(v) * 8); /* mov v, r */
}
}
}
}
/* store register 'r' in lvalue 'v' */
void store(int r, SValue *v)
{
int fr, bt, ft, fc;
int op64 = 0;
/* store the REX prefix in this variable when PIC is enabled */
int pic = 0;
#ifdef TCC_TARGET_PE
SValue v2;
v = pe_getimport(v, &v2);
#endif
fr = v->r & VT_VALMASK;
ft = v->type.t;
fc = v->c.i;
if (fc != v->c.i && (fr & VT_SYM))
tcc_error("64 bit addend in store");
ft &= ~(VT_VOLATILE | VT_CONSTANT);
bt = ft & VT_BTYPE;
#ifndef TCC_TARGET_PE
/* we need to access the variable via got */
if (fr == VT_CONST
&& (v->r & VT_SYM)
&& !(v->sym->type.t & VT_STATIC)) {
/* mov xx(%rip), %r11 */
o(0x1d8b4c);
gen_gotpcrel(TREG_R11, v->sym, v->c.i);
pic = is64_type(bt) ? 0x49 : 0x41;
}
#endif
/* XXX: incorrect if float reg to reg */
if (bt == VT_FLOAT) {
o(0x66);
o(pic);
o(0x7e0f); /* movd */
r = REG_VALUE(r);
} else if (bt == VT_DOUBLE) {
o(0x66);
o(pic);
o(0xd60f); /* movq */
r = REG_VALUE(r);
} else if (bt == VT_LDOUBLE) {
o(0xc0d9); /* fld %st(0) */
o(pic);
o(0xdb); /* fstpt */
r = 7;
} else {
if (bt == VT_SHORT)
o(0x66);
o(pic);
if (bt == VT_BYTE || bt == VT_BOOL)
orex(0, 0, r, 0x88);
else if (is64_type(bt))
op64 = 0x89;
else
orex(0, 0, r, 0x89);
}
if (pic) {
/* xxx r, (%r11) where xxx is mov, movq, fld, or etc */
if (op64)
o(op64);
o(3 + (r << 3));
} else if (op64) {
if (fr == VT_CONST || fr == VT_LOCAL || (v->r & VT_LVAL)) {
gen_modrm64(op64, r, v->r, v->sym, fc);
} else if (fr != r) {
orex(1, fr, r, op64);
o(0xc0 + fr + r * 8); /* mov r, fr */
}
} else {
if (fr == VT_CONST || fr == VT_LOCAL || (v->r & VT_LVAL)) {
gen_modrm(r, v->r, v->sym, fc);
} else if (fr != r) {
o(0xc0 + fr + r * 8); /* mov r, fr */
}
}
}
/* 'is_jmp' is '1' if it is a jump */
static void gcall_or_jmp(int is_jmp)
{
int r;
if ((vtop->r & (VT_VALMASK | VT_LVAL)) == VT_CONST &&
((vtop->r & VT_SYM) && (vtop->c.i-4) == (int)(vtop->c.i-4))) {
/* constant symbolic case -> simple relocation */
greloca(cur_text_section, vtop->sym, ind + 1, R_X86_64_PLT32, (int)(vtop->c.i-4));
oad(0xe8 + is_jmp, 0); /* call/jmp im */
} else {
/* otherwise, indirect call */
r = TREG_R11;
load(r, vtop);
o(0x41); /* REX */
o(0xff); /* call/jmp *r */
o(0xd0 + REG_VALUE(r) + (is_jmp << 4));
}
}
#if defined(CONFIG_TCC_BCHECK)
static void gen_bounds_call(int v)
{
Sym *sym = external_helper_sym(v);
oad(0xe8, 0);
greloca(cur_text_section, sym, ind-4, R_X86_64_PLT32, -4);
}
#ifdef TCC_TARGET_PE
# define TREG_FASTCALL_1 TREG_RCX
#else
# define TREG_FASTCALL_1 TREG_RDI
#endif
static void gen_bounds_prolog(void)
{
/* leave some room for bound checking code */
func_bound_offset = lbounds_section->data_offset;
func_bound_ind = ind;
func_bound_add_epilog = 0;
o(0x0d8d48 + ((TREG_FASTCALL_1 == TREG_RDI) * 0x300000)); /*lbound section pointer */
gen_le32 (0);
oad(0xb8, 0); /* call to function */
}
static void gen_bounds_epilog(void)
{
addr_t saved_ind;
addr_t *bounds_ptr;
Sym *sym_data;
int offset_modified = func_bound_offset != lbounds_section->data_offset;
if (!offset_modified && !func_bound_add_epilog)
return;
/* add end of table info */
bounds_ptr = section_ptr_add(lbounds_section, sizeof(addr_t));
*bounds_ptr = 0;
sym_data = get_sym_ref(&char_pointer_type, lbounds_section,
func_bound_offset, PTR_SIZE);
/* generate bound local allocation */
if (offset_modified) {
saved_ind = ind;
ind = func_bound_ind;
greloca(cur_text_section, sym_data, ind + 3, R_X86_64_PC32, -4);
ind = ind + 7;
gen_bounds_call(TOK___bound_local_new);
ind = saved_ind;
}
/* generate bound check local freeing */
o(0x5250); /* save returned value, if any */
o(0x20ec8348); /* sub $32,%rsp */
o(0x290f); /* movaps %xmm0,0x10(%rsp) */
o(0x102444);
o(0x240c290f); /* movaps %xmm1,(%rsp) */
greloca(cur_text_section, sym_data, ind + 3, R_X86_64_PC32, -4);
o(0x0d8d48 + ((TREG_FASTCALL_1 == TREG_RDI) * 0x300000)); /* lea xxx(%rip), %rcx/rdi */
gen_le32 (0);
gen_bounds_call(TOK___bound_local_delete);
o(0x280f); /* movaps 0x10(%rsp),%xmm0 */
o(0x102444);
o(0x240c280f); /* movaps (%rsp),%xmm1 */
o(0x20c48348); /* add $32,%rsp */
o(0x585a); /* restore returned value, if any */
}
#endif
#ifdef TCC_TARGET_PE
#define REGN 4
static const uint8_t arg_regs[REGN] = {
TREG_RCX, TREG_RDX, TREG_R8, TREG_R9
};
/* Prepare arguments in R10 and R11 rather than RCX and RDX
because gv() will not ever use these */
static int arg_prepare_reg(int idx) {
if (idx == 0 || idx == 1)
/* idx=0: r10, idx=1: r11 */
return idx + 10;
else
return idx >= 0 && idx < REGN ? arg_regs[idx] : 0;
}
/* Generate function call. The function address is pushed first, then
all the parameters in call order. This functions pops all the
parameters and the function address. */
static void gen_offs_sp(int b, int r, int d)
{
orex(1,0,r & 0x100 ? 0 : r, b);
if (d == (char)d) {
o(0x2444 | (REG_VALUE(r) << 3));
g(d);
} else {
o(0x2484 | (REG_VALUE(r) << 3));
gen_le32(d);
}
}
static int using_regs(int size)
{
return !(size > 8 || (size & (size - 1)));
}
/* Return the number of registers needed to return the struct, or 0 if
returning via struct pointer. */
ST_FUNC int gfunc_sret(CType *vt, int variadic, CType *ret, int *ret_align, int *regsize)
{
int size, align;
*ret_align = 1; // Never have to re-align return values for x86-64
*regsize = 8;
size = type_size(vt, &align);
if (!using_regs(size))
return 0;
if (size == 8)
ret->t = VT_LLONG;
else if (size == 4)
ret->t = VT_INT;
else if (size == 2)
ret->t = VT_SHORT;
else
ret->t = VT_BYTE;
ret->ref = NULL;
return 1;
}
static int is_sse_float(int t) {
int bt;
bt = t & VT_BTYPE;
return bt == VT_DOUBLE || bt == VT_FLOAT;
}
static int gfunc_arg_size(CType *type) {
int align;
if (type->t & (VT_ARRAY|VT_BITFIELD))
return 8;
return type_size(type, &align);
}
void gfunc_call(int nb_args)
{
int size, r, args_size, i, d, bt, struct_size;
int arg;
#ifdef CONFIG_TCC_BCHECK
if (tcc_state->do_bounds_check)
gbound_args(nb_args);
#endif
args_size = (nb_args < REGN ? REGN : nb_args) * PTR_SIZE;
arg = nb_args;
/* for struct arguments, we need to call memcpy and the function
call breaks register passing arguments we are preparing.
So, we process arguments which will be passed by stack first. */
struct_size = args_size;
for(i = 0; i < nb_args; i++) {
SValue *sv;
--arg;
sv = &vtop[-i];
bt = (sv->type.t & VT_BTYPE);
size = gfunc_arg_size(&sv->type);
if (using_regs(size))
continue; /* arguments smaller than 8 bytes passed in registers or on stack */
if (bt == VT_STRUCT) {
/* align to stack align size */
size = (size + 15) & ~15;
/* generate structure store */
r = get_reg(RC_INT);
gen_offs_sp(0x8d, r, struct_size);
struct_size += size;
/* generate memcpy call */
vset(&sv->type, r | VT_LVAL, 0);
vpushv(sv);
vstore();
--vtop;
} else if (bt == VT_LDOUBLE) {
gv(RC_ST0);
gen_offs_sp(0xdb, 0x107, struct_size);
struct_size += 16;
}
}
if (func_scratch < struct_size)
func_scratch = struct_size;
arg = nb_args;
struct_size = args_size;
for(i = 0; i < nb_args; i++) {
--arg;
bt = (vtop->type.t & VT_BTYPE);
size = gfunc_arg_size(&vtop->type);
if (!using_regs(size)) {
/* align to stack align size */
size = (size + 15) & ~15;
if (arg >= REGN) {
d = get_reg(RC_INT);
gen_offs_sp(0x8d, d, struct_size);
gen_offs_sp(0x89, d, arg*8);
} else {
d = arg_prepare_reg(arg);
gen_offs_sp(0x8d, d, struct_size);
}
struct_size += size;
} else {
if (is_sse_float(vtop->type.t)) {
if (tcc_state->nosse)
tcc_error("SSE disabled");
if (arg >= REGN) {
gv(RC_XMM0);
/* movq %xmm0, j*8(%rsp) */
gen_offs_sp(0xd60f66, 0x100, arg*8);
} else {
/* Load directly to xmmN register */
gv(RC_XMM0 << arg);
d = arg_prepare_reg(arg);
/* mov %xmmN, %rxx */
o(0x66);
orex(1,d,0, 0x7e0f);
o(0xc0 + arg*8 + REG_VALUE(d));
}
} else {
if (bt == VT_STRUCT) {
vtop->type.ref = NULL;
vtop->type.t = size > 4 ? VT_LLONG : size > 2 ? VT_INT
: size > 1 ? VT_SHORT : VT_BYTE;
}
r = gv(RC_INT);
if (arg >= REGN) {
gen_offs_sp(0x89, r, arg*8);
} else {
d = arg_prepare_reg(arg);
orex(1,d,r,0x89); /* mov */
o(0xc0 + REG_VALUE(r) * 8 + REG_VALUE(d));
}
}
}
vtop--;
}
save_regs(0);
/* Copy R10 and R11 into RCX and RDX, respectively */
if (nb_args > 0) {
o(0xd1894c); /* mov %r10, %rcx */
if (nb_args > 1) {
o(0xda894c); /* mov %r11, %rdx */
}
}
gcall_or_jmp(0);
if ((vtop->r & VT_SYM) && vtop->sym->v == TOK_alloca) {
/* need to add the "func_scratch" area after alloca */
o(0x48); func_alloca = oad(0x05, func_alloca); /* add $NN, %rax */
#ifdef CONFIG_TCC_BCHECK
if (tcc_state->do_bounds_check)
gen_bounds_call(TOK___bound_alloca_nr); /* new region */
#endif
}
vtop--;
}
#define FUNC_PROLOG_SIZE 11
/* generate function prolog of type 't' */
void gfunc_prolog(Sym *func_sym)
{
CType *func_type = &func_sym->type;
int addr, reg_param_index, bt, size;
Sym *sym;
CType *type;
func_ret_sub = 0;
func_scratch = 32;
func_alloca = 0;
loc = 0;
addr = PTR_SIZE * 2;
ind += FUNC_PROLOG_SIZE;
func_sub_sp_offset = ind;
reg_param_index = 0;
sym = func_type->ref;
/* if the function returns a structure, then add an
implicit pointer parameter */
size = gfunc_arg_size(&func_vt);
if (!using_regs(size)) {
gen_modrm64(0x89, arg_regs[reg_param_index], VT_LOCAL, NULL, addr);
func_vc = addr;
reg_param_index++;
addr += 8;
}
/* define parameters */
while ((sym = sym->next) != NULL) {
type = &sym->type;
bt = type->t & VT_BTYPE;
size = gfunc_arg_size(type);
if (!using_regs(size)) {
if (reg_param_index < REGN) {
gen_modrm64(0x89, arg_regs[reg_param_index], VT_LOCAL, NULL, addr);
}
sym_push(sym->v & ~SYM_FIELD, type,
VT_LLOCAL | VT_LVAL, addr);
} else {
if (reg_param_index < REGN) {
/* save arguments passed by register */
if ((bt == VT_FLOAT) || (bt == VT_DOUBLE)) {
if (tcc_state->nosse)
tcc_error("SSE disabled");
o(0xd60f66); /* movq */
gen_modrm(reg_param_index, VT_LOCAL, NULL, addr);
} else {
gen_modrm64(0x89, arg_regs[reg_param_index], VT_LOCAL, NULL, addr);
}
}
sym_push(sym->v & ~SYM_FIELD, type,
VT_LOCAL | VT_LVAL, addr);
}
addr += 8;
reg_param_index++;
}
while (reg_param_index < REGN) {
if (func_var) {
gen_modrm64(0x89, arg_regs[reg_param_index], VT_LOCAL, NULL, addr);
addr += 8;