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/*
* A64 code generator for TCC
*
* Copyright (c) 2014-2015 Edmund Grimley Evans
*
* Copying and distribution of this file, with or without modification,
* are permitted in any medium without royalty provided the copyright
* notice and this notice are preserved. This file is offered as-is,
* without any warranty.
*/
#ifdef TARGET_DEFS_ONLY
// Number of registers available to allocator:
#define NB_REGS 28 // x0-x18, x30, v0-v7
#define TREG_R(x) (x) // x = 0..18
#define TREG_R30 19
#define TREG_F(x) (x + 20) // x = 0..7
// Register classes sorted from more general to more precise:
#define RC_INT (1 << 0)
#define RC_FLOAT (1 << 1)
#define RC_R(x) (1 << (2 + (x))) // x = 0..18
#define RC_R30 (1 << 21)
#define RC_F(x) (1 << (22 + (x))) // x = 0..7
#define RC_IRET (RC_R(0)) // int return register class
#define RC_FRET (RC_F(0)) // float return register class
#define REG_IRET (TREG_R(0)) // int return register number
#define REG_FRET (TREG_F(0)) // float return register number
#define PTR_SIZE 8
#define LDOUBLE_SIZE 16
#define LDOUBLE_ALIGN 16
#define MAX_ALIGN 16
#define CHAR_IS_UNSIGNED
/* define if return values need to be extended explicitely
at caller side (for interfacing with non-TCC compilers) */
#define PROMOTE_RET
/******************************************************/
#else /* ! TARGET_DEFS_ONLY */
/******************************************************/
#define USING_GLOBALS
#include "tcc.h"
#include <assert.h>
ST_DATA const int reg_classes[NB_REGS] = {
RC_INT | RC_R(0),
RC_INT | RC_R(1),
RC_INT | RC_R(2),
RC_INT | RC_R(3),
RC_INT | RC_R(4),
RC_INT | RC_R(5),
RC_INT | RC_R(6),
RC_INT | RC_R(7),
RC_INT | RC_R(8),
RC_INT | RC_R(9),
RC_INT | RC_R(10),
RC_INT | RC_R(11),
RC_INT | RC_R(12),
RC_INT | RC_R(13),
RC_INT | RC_R(14),
RC_INT | RC_R(15),
RC_INT | RC_R(16),
RC_INT | RC_R(17),
RC_INT | RC_R(18),
RC_R30, // not in RC_INT as we make special use of x30
RC_FLOAT | RC_F(0),
RC_FLOAT | RC_F(1),
RC_FLOAT | RC_F(2),
RC_FLOAT | RC_F(3),
RC_FLOAT | RC_F(4),
RC_FLOAT | RC_F(5),
RC_FLOAT | RC_F(6),
RC_FLOAT | RC_F(7)
};
#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
#define IS_FREG(x) ((x) >= TREG_F(0))
static uint32_t intr(int r)
{
assert(TREG_R(0) <= r && r <= TREG_R30);
return r < TREG_R30 ? r : 30;
}
static uint32_t fltr(int r)
{
assert(TREG_F(0) <= r && r <= TREG_F(7));
return r - TREG_F(0);
}
// Add an instruction to text section:
ST_FUNC void o(unsigned int c)
{
int ind1 = ind + 4;
if (nocode_wanted)
return;
if (ind1 > cur_text_section->data_allocated)
section_realloc(cur_text_section, ind1);
write32le(cur_text_section->data + ind, c);
ind = ind1;
}
static int arm64_encode_bimm64(uint64_t x)
{
int neg = x & 1;
int rep, pos, len;
if (neg)
x = ~x;
if (!x)
return -1;
if (x >> 2 == (x & (((uint64_t)1 << (64 - 2)) - 1)))
rep = 2, x &= ((uint64_t)1 << 2) - 1;
else if (x >> 4 == (x & (((uint64_t)1 << (64 - 4)) - 1)))
rep = 4, x &= ((uint64_t)1 << 4) - 1;
else if (x >> 8 == (x & (((uint64_t)1 << (64 - 8)) - 1)))
rep = 8, x &= ((uint64_t)1 << 8) - 1;
else if (x >> 16 == (x & (((uint64_t)1 << (64 - 16)) - 1)))
rep = 16, x &= ((uint64_t)1 << 16) - 1;
else if (x >> 32 == (x & (((uint64_t)1 << (64 - 32)) - 1)))
rep = 32, x &= ((uint64_t)1 << 32) - 1;
else
rep = 64;
pos = 0;
if (!(x & (((uint64_t)1 << 32) - 1))) x >>= 32, pos += 32;
if (!(x & (((uint64_t)1 << 16) - 1))) x >>= 16, pos += 16;
if (!(x & (((uint64_t)1 << 8) - 1))) x >>= 8, pos += 8;
if (!(x & (((uint64_t)1 << 4) - 1))) x >>= 4, pos += 4;
if (!(x & (((uint64_t)1 << 2) - 1))) x >>= 2, pos += 2;
if (!(x & (((uint64_t)1 << 1) - 1))) x >>= 1, pos += 1;
len = 0;
if (!(~x & (((uint64_t)1 << 32) - 1))) x >>= 32, len += 32;
if (!(~x & (((uint64_t)1 << 16) - 1))) x >>= 16, len += 16;
if (!(~x & (((uint64_t)1 << 8) - 1))) x >>= 8, len += 8;
if (!(~x & (((uint64_t)1 << 4) - 1))) x >>= 4, len += 4;
if (!(~x & (((uint64_t)1 << 2) - 1))) x >>= 2, len += 2;
if (!(~x & (((uint64_t)1 << 1) - 1))) x >>= 1, len += 1;
if (x)
return -1;
if (neg) {
pos = (pos + len) & (rep - 1);
len = rep - len;
}
return ((0x1000 & rep << 6) | (((rep - 1) ^ 31) << 1 & 63) |
((rep - pos) & (rep - 1)) << 6 | (len - 1));
}
static uint32_t arm64_movi(int r, uint64_t x)
{
uint64_t m = 0xffff;
int e;
if (!(x & ~m))
return 0x52800000 | r | x << 5; // movz w(r),#(x)
if (!(x & ~(m << 16)))
return 0x52a00000 | r | x >> 11; // movz w(r),#(x >> 16),lsl #16
if (!(x & ~(m << 32)))
return 0xd2c00000 | r | x >> 27; // movz x(r),#(x >> 32),lsl #32
if (!(x & ~(m << 48)))
return 0xd2e00000 | r | x >> 43; // movz x(r),#(x >> 48),lsl #48
if ((x & ~m) == m << 16)
return (0x12800000 | r |
(~x << 5 & 0x1fffe0)); // movn w(r),#(~x)
if ((x & ~(m << 16)) == m)
return (0x12a00000 | r |
(~x >> 11 & 0x1fffe0)); // movn w(r),#(~x >> 16),lsl #16
if (!~(x | m))
return (0x92800000 | r |
(~x << 5 & 0x1fffe0)); // movn x(r),#(~x)
if (!~(x | m << 16))
return (0x92a00000 | r |
(~x >> 11 & 0x1fffe0)); // movn x(r),#(~x >> 16),lsl #16
if (!~(x | m << 32))
return (0x92c00000 | r |
(~x >> 27 & 0x1fffe0)); // movn x(r),#(~x >> 32),lsl #32
if (!~(x | m << 48))
return (0x92e00000 | r |
(~x >> 43 & 0x1fffe0)); // movn x(r),#(~x >> 32),lsl #32
if (!(x >> 32) && (e = arm64_encode_bimm64(x | x << 32)) >= 0)
return 0x320003e0 | r | (uint32_t)e << 10; // movi w(r),#(x)
if ((e = arm64_encode_bimm64(x)) >= 0)
return 0xb20003e0 | r | (uint32_t)e << 10; // movi x(r),#(x)
return 0;
}
static void arm64_movimm(int r, uint64_t x)
{
uint32_t i;
if ((i = arm64_movi(r, x)))
o(i); // a single MOV
else {
// MOVZ/MOVN and 1-3 MOVKs
int z = 0, m = 0;
uint32_t mov1 = 0xd2800000; // movz
uint64_t x1 = x;
for (i = 0; i < 64; i += 16) {
z += !(x >> i & 0xffff);
m += !(~x >> i & 0xffff);
}
if (m > z) {
x1 = ~x;
mov1 = 0x92800000; // movn
}
for (i = 0; i < 64; i += 16)
if (x1 >> i & 0xffff) {
o(mov1 | r | (x1 >> i & 0xffff) << 5 | i << 17);
// movz/movn x(r),#(*),lsl #(i)
break;
}
for (i += 16; i < 64; i += 16)
if (x1 >> i & 0xffff)
o(0xf2800000 | r | (x >> i & 0xffff) << 5 | i << 17);
// movk x(r),#(*),lsl #(i)
}
}
// Patch all branches in list pointed to by t to branch to a:
ST_FUNC void gsym_addr(int t_, int a_)
{
uint32_t t = t_;
uint32_t a = a_;
while (t) {
unsigned char *ptr = cur_text_section->data + t;
uint32_t next = read32le(ptr);
if (a - t + 0x8000000 >= 0x10000000)
tcc_error("branch out of range");
write32le(ptr, (a - t == 4 ? 0xd503201f : // nop
0x14000000 | ((a - t) >> 2 & 0x3ffffff))); // b
t = next;
}
}
static int arm64_type_size(int t)
{
/*
* case values are in increasing order (from 1 to 11).
* which 'may' help compiler optimizers. See tcc.h
*/
switch (t & VT_BTYPE) {
case VT_BYTE: return 0;
case VT_SHORT: return 1;
case VT_INT: return 2;
case VT_LLONG: return 3;
case VT_PTR: return 3;
case VT_FUNC: return 3;
case VT_STRUCT: return 3;
case VT_FLOAT: return 2;
case VT_DOUBLE: return 3;
case VT_LDOUBLE: return 4;
case VT_BOOL: return 0;
}
assert(0);
return 0;
}
static void arm64_spoff(int reg, uint64_t off)
{
uint32_t sub = off >> 63;
if (sub)
off = -off;
if (off < 4096)
o(0x910003e0 | sub << 30 | reg | off << 10);
// (add|sub) x(reg),sp,#(off)
else {
arm64_movimm(30, off); // use x30 for offset
o(0x8b3e63e0 | sub << 30 | reg); // (add|sub) x(reg),sp,x30
}
}
/* invert 0: return value to use for store/load */
/* invert 1: return value to use for arm64_sym */
static uint64_t arm64_check_offset(int invert, int sz_, uint64_t off)
{
uint32_t sz = sz_;
if (!(off & ~((uint32_t)0xfff << sz)) ||
(off < 256 || -off <= 256))
return invert ? off : 0ul;
else if ((off & ((uint32_t)0xfff << sz)))
return invert ? off & ((uint32_t)0xfff << sz)
: off & ~((uint32_t)0xfff << sz);
else if (off & 0x1ff)
return invert ? off & 0x1ff : off & ~0x1ff;
else
return invert ? 0ul : off;
}
static void arm64_ldrx(int sg, int sz_, int dst, int bas, uint64_t off)
{
uint32_t sz = sz_;
if (sz >= 2)
sg = 0;
if (!(off & ~((uint32_t)0xfff << sz)))
o(0x39400000 | dst | bas << 5 | off << (10 - sz) |
(uint32_t)!!sg << 23 | sz << 30); // ldr(*) x(dst),[x(bas),#(off)]
else if (off < 256 || -off <= 256)
o(0x38400000 | dst | bas << 5 | (off & 511) << 12 |
(uint32_t)!!sg << 23 | sz << 30); // ldur(*) x(dst),[x(bas),#(off)]
else {
arm64_movimm(30, off); // use x30 for offset
o(0x38206800 | dst | bas << 5 | (uint32_t)30 << 16 |
(uint32_t)(!!sg + 1) << 22 | sz << 30); // ldr(*) x(dst),[x(bas),x30]
}
}
static void arm64_ldrv(int sz_, int dst, int bas, uint64_t off)
{
uint32_t sz = sz_;
if (!(off & ~((uint32_t)0xfff << sz)))
o(0x3d400000 | dst | bas << 5 | off << (10 - sz) |
(sz & 4) << 21 | (sz & 3) << 30); // ldr (s|d|q)(dst),[x(bas),#(off)]
else if (off < 256 || -off <= 256)
o(0x3c400000 | dst | bas << 5 | (off & 511) << 12 |
(sz & 4) << 21 | (sz & 3) << 30); // ldur (s|d|q)(dst),[x(bas),#(off)]
else {
arm64_movimm(30, off); // use x30 for offset
o(0x3c606800 | dst | bas << 5 | (uint32_t)30 << 16 |
sz << 30 | (sz & 4) << 21); // ldr (s|d|q)(dst),[x(bas),x30]
}
}
static void arm64_ldrs(int reg_, int size)
{
uint32_t reg = reg_;
// Use x30 for intermediate value in some cases.
switch (size) {
default: assert(0); break;
case 0:
/* Can happen with zero size structs */
break;
case 1:
arm64_ldrx(0, 0, reg, reg, 0);
break;
case 2:
arm64_ldrx(0, 1, reg, reg, 0);
break;
case 3:
arm64_ldrx(0, 1, 30, reg, 0);
arm64_ldrx(0, 0, reg, reg, 2);
o(0x2a0043c0 | reg | reg << 16); // orr x(reg),x30,x(reg),lsl #16
break;
case 4:
arm64_ldrx(0, 2, reg, reg, 0);
break;
case 5:
arm64_ldrx(0, 2, 30, reg, 0);
arm64_ldrx(0, 0, reg, reg, 4);
o(0xaa0083c0 | reg | reg << 16); // orr x(reg),x30,x(reg),lsl #32
break;
case 6:
arm64_ldrx(0, 2, 30, reg, 0);
arm64_ldrx(0, 1, reg, reg, 4);
o(0xaa0083c0 | reg | reg << 16); // orr x(reg),x30,x(reg),lsl #32
break;
case 7:
arm64_ldrx(0, 2, 30, reg, 0);
arm64_ldrx(0, 2, reg, reg, 3);
o(0x53087c00 | reg | reg << 5); // lsr w(reg), w(reg), #8
o(0xaa0083c0 | reg | reg << 16); // orr x(reg),x30,x(reg),lsl #32
break;
case 8:
arm64_ldrx(0, 3, reg, reg, 0);
break;
case 9:
arm64_ldrx(0, 0, reg + 1, reg, 8);
arm64_ldrx(0, 3, reg, reg, 0);
break;
case 10:
arm64_ldrx(0, 1, reg + 1, reg, 8);
arm64_ldrx(0, 3, reg, reg, 0);
break;
case 11:
arm64_ldrx(0, 2, reg + 1, reg, 7);
o(0x53087c00 | (reg+1) | (reg+1) << 5); // lsr w(reg+1), w(reg+1), #8
arm64_ldrx(0, 3, reg, reg, 0);
break;
case 12:
arm64_ldrx(0, 2, reg + 1, reg, 8);
arm64_ldrx(0, 3, reg, reg, 0);
break;
case 13:
arm64_ldrx(0, 3, reg + 1, reg, 5);
o(0xd358fc00 | (reg+1) | (reg+1) << 5); // lsr x(reg+1), x(reg+1), #24
arm64_ldrx(0, 3, reg, reg, 0);
break;
case 14:
arm64_ldrx(0, 3, reg + 1, reg, 6);
o(0xd350fc00 | (reg+1) | (reg+1) << 5); // lsr x(reg+1), x(reg+1), #16
arm64_ldrx(0, 3, reg, reg, 0);
break;
case 15:
arm64_ldrx(0, 3, reg + 1, reg, 7);
o(0xd348fc00 | (reg+1) | (reg+1) << 5); // lsr x(reg+1), x(reg+1), #8
arm64_ldrx(0, 3, reg, reg, 0);
break;
case 16:
o(0xa9400000 | reg | (reg+1) << 10 | reg << 5);
// ldp x(reg),x(reg+1),[x(reg)]
break;
}
}
static void arm64_strx(int sz_, int dst, int bas, uint64_t off)
{
uint32_t sz = sz_;
if (!(off & ~((uint32_t)0xfff << sz)))
o(0x39000000 | dst | bas << 5 | off << (10 - sz) | sz << 30);
// str(*) x(dst),[x(bas],#(off)]
else if (off < 256 || -off <= 256)
o(0x38000000 | dst | bas << 5 | (off & 511) << 12 | sz << 30);
// stur(*) x(dst),[x(bas],#(off)]
else {
arm64_movimm(30, off); // use x30 for offset
o(0x38206800 | dst | bas << 5 | (uint32_t)30 << 16 | sz << 30);
// str(*) x(dst),[x(bas),x30]
}
}
static void arm64_strv(int sz_, int dst, int bas, uint64_t off)
{
uint32_t sz = sz_;
if (!(off & ~((uint32_t)0xfff << sz)))
o(0x3d000000 | dst | bas << 5 | off << (10 - sz) |
(sz & 4) << 21 | (sz & 3) << 30); // str (s|d|q)(dst),[x(bas),#(off)]
else if (off < 256 || -off <= 256)
o(0x3c000000 | dst | bas << 5 | (off & 511) << 12 |
(sz & 4) << 21 | (sz & 3) << 30); // stur (s|d|q)(dst),[x(bas),#(off)]
else {
arm64_movimm(30, off); // use x30 for offset
o(0x3c206800 | dst | bas << 5 | (uint32_t)30 << 16 |
sz << 30 | (sz & 4) << 21); // str (s|d|q)(dst),[x(bas),x30]
}
}
static void arm64_sym(int r, Sym *sym, unsigned long addend)
{
greloca(cur_text_section, sym, ind, R_AARCH64_ADR_GOT_PAGE, 0);
o(0x90000000 | r); // adrp xr, #sym
greloca(cur_text_section, sym, ind, R_AARCH64_LD64_GOT_LO12_NC, 0);
o(0xf9400000 | r | (r << 5)); // ld xr,[xr, #sym]
if (addend) {
// add xr, xr, #addend
if (addend & 0xffful)
o(0x91000000 | r | r << 5 | (addend & 0xfff) << 10);
if (addend > 0xffful) {
// add xr, xr, #addend, lsl #12
if (addend & 0xfff000ul)
o(0x91400000 | r | r << 5 | ((addend >> 12) & 0xfff) << 10);
if (addend > 0xfffffful) {
/* very unlikely */
int t = r ? 0 : 1;
o(0xf81f0fe0 | t); /* str xt, [sp, #-16]! */
arm64_movimm(t, addend & ~0xfffffful); // use xt for addent
o(0x91000000 | r | (t << 5)); /* add xr, xt, #0 */
o(0xf84107e0 | t); /* ldr xt, [sp], #16 */
}
}
}
}
static void arm64_load_cmp(int r, SValue *sv);
ST_FUNC void load(int r, SValue *sv)
{
int svtt = sv->type.t;
int svr = sv->r & ~VT_BOUNDED;
int svrv = svr & VT_VALMASK;
uint64_t svcul = (uint32_t)sv->c.i;
svcul = svcul >> 31 & 1 ? svcul - ((uint64_t)1 << 32) : svcul;
if (svr == (VT_LOCAL | VT_LVAL)) {
if (IS_FREG(r))
arm64_ldrv(arm64_type_size(svtt), fltr(r), 29, svcul);
else
arm64_ldrx(!(svtt & VT_UNSIGNED), arm64_type_size(svtt),
intr(r), 29, svcul);
return;
}
if (svr == (VT_CONST | VT_LVAL)) {
arm64_sym(30, sv->sym, // use x30 for address
arm64_check_offset(0, arm64_type_size(svtt), sv->c.i));
if (IS_FREG(r))
arm64_ldrv(arm64_type_size(svtt), fltr(r), 30,
arm64_check_offset(1, arm64_type_size(svtt), sv->c.i));
else
arm64_ldrx(!(svtt&VT_UNSIGNED), arm64_type_size(svtt), intr(r), 30,
arm64_check_offset(1, arm64_type_size(svtt), sv->c.i));
return;
}
if ((svr & ~VT_VALMASK) == VT_LVAL && svrv < VT_CONST) {
if ((svtt & VT_BTYPE) != VT_VOID) {
if (IS_FREG(r))
arm64_ldrv(arm64_type_size(svtt), fltr(r), intr(svrv), 0);
else
arm64_ldrx(!(svtt & VT_UNSIGNED), arm64_type_size(svtt),
intr(r), intr(svrv), 0);
}
return;
}
if (svr == (VT_CONST | VT_LVAL | VT_SYM)) {
arm64_sym(30, sv->sym, // use x30 for address
arm64_check_offset(0, arm64_type_size(svtt), svcul));
if (IS_FREG(r))
arm64_ldrv(arm64_type_size(svtt), fltr(r), 30,
arm64_check_offset(1, arm64_type_size(svtt), svcul));
else
arm64_ldrx(!(svtt&VT_UNSIGNED), arm64_type_size(svtt), intr(r), 30,
arm64_check_offset(1, arm64_type_size(svtt), svcul));
return;
}
if (svr == (VT_CONST | VT_SYM)) {
arm64_sym(intr(r), sv->sym, svcul);
return;
}
if (svr == VT_CONST) {
if ((svtt & VT_BTYPE) != VT_VOID)
arm64_movimm(intr(r), arm64_type_size(svtt) == 3 ?
sv->c.i : (uint32_t)svcul);
return;
}
if (svr < VT_CONST) {
if (IS_FREG(r) && IS_FREG(svr))
if (svtt == VT_LDOUBLE)
o(0x4ea01c00 | fltr(r) | fltr(svr) << 5);
// mov v(r).16b,v(svr).16b
else
o(0x1e604000 | fltr(r) | fltr(svr) << 5); // fmov d(r),d(svr)
else if (!IS_FREG(r) && !IS_FREG(svr))
o(0xaa0003e0 | intr(r) | intr(svr) << 16); // mov x(r),x(svr)
else
assert(0);
return;
}
if (svr == VT_LOCAL) {
if (-svcul < 0x1000)
o(0xd10003a0 | intr(r) | -svcul << 10); // sub x(r),x29,#...
else {
arm64_movimm(30, -svcul); // use x30 for offset
o(0xcb0003a0 | intr(r) | (uint32_t)30 << 16); // sub x(r),x29,x30
}
return;
}
if (svr == VT_JMP || svr == VT_JMPI) {
int t = (svr == VT_JMPI);
arm64_movimm(intr(r), t);
o(0x14000002); // b .+8
gsym(svcul);
arm64_movimm(intr(r), t ^ 1);
return;
}
if (svr == (VT_LLOCAL | VT_LVAL)) {
arm64_ldrx(0, 3, 30, 29, svcul); // use x30 for offset
if (IS_FREG(r))
arm64_ldrv(arm64_type_size(svtt), fltr(r), 30, 0);
else
arm64_ldrx(!(svtt & VT_UNSIGNED), arm64_type_size(svtt),
intr(r), 30, 0);
return;
}
if (svr == VT_CMP) {
arm64_load_cmp(r, sv);
return;
}
printf("load(%x, (%x, %x, %llx))\n", r, svtt, sv->r, (long long)svcul);
assert(0);
}
ST_FUNC void store(int r, SValue *sv)
{
int svtt = sv->type.t;
int svr = sv->r & ~VT_BOUNDED;
int svrv = svr & VT_VALMASK;
uint64_t svcul = (uint32_t)sv->c.i;
svcul = svcul >> 31 & 1 ? svcul - ((uint64_t)1 << 32) : svcul;
if (svr == (VT_LOCAL | VT_LVAL)) {
if (IS_FREG(r))
arm64_strv(arm64_type_size(svtt), fltr(r), 29, svcul);
else
arm64_strx(arm64_type_size(svtt), intr(r), 29, svcul);
return;
}
if (svr == (VT_CONST | VT_LVAL)) {
arm64_sym(30, sv->sym, // use x30 for address
arm64_check_offset(0, arm64_type_size(svtt), sv->c.i));
if (IS_FREG(r))
arm64_strv(arm64_type_size(svtt), fltr(r), 30,
arm64_check_offset(1, arm64_type_size(svtt), sv->c.i));
else
arm64_strx(arm64_type_size(svtt), intr(r), 30,
arm64_check_offset(1, arm64_type_size(svtt), sv->c.i));
return;
}
if ((svr & ~VT_VALMASK) == VT_LVAL && svrv < VT_CONST) {
if (IS_FREG(r))
arm64_strv(arm64_type_size(svtt), fltr(r), intr(svrv), 0);
else
arm64_strx(arm64_type_size(svtt), intr(r), intr(svrv), 0);
return;
}
if (svr == (VT_CONST | VT_LVAL | VT_SYM)) {
arm64_sym(30, sv->sym, // use x30 for address
arm64_check_offset(0, arm64_type_size(svtt), svcul));
if (IS_FREG(r))
arm64_strv(arm64_type_size(svtt), fltr(r), 30,
arm64_check_offset(1, arm64_type_size(svtt), svcul));
else
arm64_strx(arm64_type_size(svtt), intr(r), 30,
arm64_check_offset(1, arm64_type_size(svtt), svcul));
return;
}
printf("store(%x, (%x, %x, %llx))\n", r, svtt, sv->r, (long long)svcul);
assert(0);
}
static void arm64_gen_bl_or_b(int b)
{
if ((vtop->r & (VT_VALMASK | VT_LVAL)) == VT_CONST && (vtop->r & VT_SYM)) {
greloca(cur_text_section, vtop->sym, ind,
b ? R_AARCH64_JUMP26 : R_AARCH64_CALL26, 0);
o(0x14000000 | (uint32_t)!b << 31); // b/bl .
}
else {
#ifdef CONFIG_TCC_BCHECK
vtop->r &= ~VT_MUSTBOUND;
#endif
o(0xd61f0000 | (uint32_t)!b << 21 | intr(gv(RC_R30)) << 5); // br/blr
}
}
#if defined(CONFIG_TCC_BCHECK)
static void gen_bounds_call(int v)
{
Sym *sym = external_global_sym(v, &func_old_type);
greloca(cur_text_section, sym, ind, R_AARCH64_CALL26, 0);
o(0x94000000); // bl
}
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(0xd503201f); /* nop -> mov x0, lbound section pointer */
o(0xd503201f);
o(0xd503201f);
o(0xd503201f); /* nop -> call __bound_local_new */
}
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, lbounds_section->data_offset);
/* generate bound local allocation */
if (offset_modified) {
saved_ind = ind;
ind = func_bound_ind;
greloca(cur_text_section, sym_data, ind, R_AARCH64_ADR_GOT_PAGE, 0);
o(0x90000000 | 0); // adrp x0, #sym_data
greloca(cur_text_section, sym_data, ind, R_AARCH64_LD64_GOT_LO12_NC, 0);
o(0xf9400000 | 0 | (0 << 5)); // ld x0,[x0, #sym_data]
gen_bounds_call(TOK___bound_local_new);
ind = saved_ind;
}
/* generate bound check local freeing */
o(0xf81f0fe0); /* str x0, [sp, #-16]! */
o(0x3c9f0fe0); /* str q0, [sp, #-16]! */
greloca(cur_text_section, sym_data, ind, R_AARCH64_ADR_GOT_PAGE, 0);
o(0x90000000 | 0); // adrp x0, #sym_data
greloca(cur_text_section, sym_data, ind, R_AARCH64_LD64_GOT_LO12_NC, 0);
o(0xf9400000 | 0 | (0 << 5)); // ld x0,[x0, #sym_data]
gen_bounds_call(TOK___bound_local_delete);
o(0x3cc107e0); /* ldr q0, [sp], #16 */
o(0xf84107e0); /* ldr x0, [sp], #16 */
}
#endif
static int arm64_hfa_aux(CType *type, int *fsize, int num)
{
if (is_float(type->t)) {
int a, n = type_size(type, &a);
if (num >= 4 || (*fsize && *fsize != n))
return -1;
*fsize = n;
return num + 1;
}
else if ((type->t & VT_BTYPE) == VT_STRUCT) {
int is_struct = 0; // rather than union
Sym *field;
for (field = type->ref->next; field; field = field->next)
if (field->c) {
is_struct = 1;
break;
}
if (is_struct) {
int num0 = num;
for (field = type->ref->next; field; field = field->next) {
if (field->c != (num - num0) * *fsize)
return -1;
num = arm64_hfa_aux(&field->type, fsize, num);
if (num == -1)
return -1;
}
if (type->ref->c != (num - num0) * *fsize)
return -1;
return num;
}
else { // union
int num0 = num;
for (field = type->ref->next; field; field = field->next) {
int num1 = arm64_hfa_aux(&field->type, fsize, num0);
if (num1 == -1)
return -1;
num = num1 < num ? num : num1;
}
if (type->ref->c != (num - num0) * *fsize)
return -1;
return num;
}
}
else if ((type->t & VT_ARRAY) && ((type->t & VT_BTYPE) != VT_PTR)) {
int num1;
if (!type->ref->c)
return num;
num1 = arm64_hfa_aux(&type->ref->type, fsize, num);
if (num1 == -1 || (num1 != num && type->ref->c > 4))
return -1;
num1 = num + type->ref->c * (num1 - num);
if (num1 > 4)
return -1;
return num1;
}
return -1;
}
static int arm64_hfa(CType *type, unsigned *fsize)
{
if ((type->t & VT_BTYPE) == VT_STRUCT ||
((type->t & VT_ARRAY) && ((type->t & VT_BTYPE) != VT_PTR))) {
int sz = 0;
int n = arm64_hfa_aux(type, &sz, 0);
if (0 < n && n <= 4) {
if (fsize)
*fsize = sz;
return n;
}
}
return 0;
}
static unsigned long arm64_pcs_aux(int n, CType **type, unsigned long *a)
{
int nx = 0; // next integer register
int nv = 0; // next vector register
unsigned long ns = 32; // next stack offset
int i;
for (i = 0; i < n; i++) {
int hfa = arm64_hfa(type[i], 0);
int size, align;
if ((type[i]->t & VT_ARRAY) ||
(type[i]->t & VT_BTYPE) == VT_FUNC)
size = align = 8;
else
size = type_size(type[i], &align);
if (hfa)
// B.2
;
else if (size > 16) {
// B.3: replace with pointer
if (nx < 8)
a[i] = nx++ << 1 | 1;
else {
ns = (ns + 7) & ~7;
a[i] = ns | 1;
ns += 8;
}
continue;
}
else if ((type[i]->t & VT_BTYPE) == VT_STRUCT)
// B.4
size = (size + 7) & ~7;
// C.1
if (is_float(type[i]->t) && nv < 8) {
a[i] = 16 + (nv++ << 1);
continue;
}
// C.2
if (hfa && nv + hfa <= 8) {
a[i] = 16 + (nv << 1);
nv += hfa;
continue;
}
// C.3
if (hfa) {
nv = 8;
size = (size + 7) & ~7;
}
// C.4
if (hfa || (type[i]->t & VT_BTYPE) == VT_LDOUBLE) {
ns = (ns + 7) & ~7;
ns = (ns + align - 1) & -align;
}
// C.5
if ((type[i]->t & VT_BTYPE) == VT_FLOAT)
size = 8;
// C.6
if (hfa || is_float(type[i]->t)) {
a[i] = ns;
ns += size;
continue;
}
// C.7
if ((type[i]->t & VT_BTYPE) != VT_STRUCT && size <= 8 && nx < 8) {
a[i] = nx++ << 1;
continue;
}
// C.8
if (align == 16)
nx = (nx + 1) & ~1;
// C.9
if ((type[i]->t & VT_BTYPE) != VT_STRUCT && size == 16 && nx < 7) {
a[i] = nx << 1;
nx += 2;
continue;
}
// C.10
if ((type[i]->t & VT_BTYPE) == VT_STRUCT && size <= (8 - nx) * 8) {
a[i] = nx << 1;
nx += (size + 7) >> 3;
continue;
}
// C.11
nx = 8;
// C.12
ns = (ns + 7) & ~7;
ns = (ns + align - 1) & -align;
// C.13
if ((type[i]->t & VT_BTYPE) == VT_STRUCT) {
a[i] = ns;
ns += size;
continue;
}
// C.14
if (size < 8)
size = 8;
// C.15
a[i] = ns;
ns += size;
}
return ns - 32;
}
static unsigned long arm64_pcs(int n, CType **type, unsigned long *a)
{
unsigned long stack;
// Return type:
if ((type[0]->t & VT_BTYPE) == VT_VOID)
a[0] = -1;
else {
arm64_pcs_aux(1, type, a);
assert(a[0] == 0 || a[0] == 1 || a[0] == 16);
}
// Argument types:
stack = arm64_pcs_aux(n, type + 1, a + 1);
if (0) {
int i;
for (i = 0; i <= n; i++) {
if (!i)
printf("arm64_pcs return: ");
else
printf("arm64_pcs arg %d: ", i);
if (a[i] == (unsigned long)-1)
printf("void\n");
else if (a[i] == 1 && !i)
printf("X8 pointer\n");
else if (a[i] < 16)
printf("X%lu%s\n", a[i] / 2, a[i] & 1 ? " pointer" : "");
else if (a[i] < 32)
printf("V%lu\n", a[i] / 2 - 8);
else
printf("stack %lu%s\n",
(a[i] - 32) & ~1, a[i] & 1 ? " pointer" : "");
}
}
return stack;
}
ST_FUNC void gfunc_call(int nb_args)
{
CType *return_type;
CType **t;
unsigned long *a, *a1;
unsigned long stack;
int i;
#ifdef CONFIG_TCC_BCHECK
if (tcc_state->do_bounds_check)
gbound_args(nb_args);
#endif
return_type = &vtop[-nb_args].type.ref->type;
if ((return_type->t & VT_BTYPE) == VT_STRUCT)
--nb_args;
t = tcc_malloc((nb_args + 1) * sizeof(*t));
a = tcc_malloc((nb_args + 1) * sizeof(*a));
a1 = tcc_malloc((nb_args + 1) * sizeof(*a1));
t[0] = return_type;
for (i = 0; i < nb_args; i++)
t[nb_args - i] = &vtop[-i].type;
stack = arm64_pcs(nb_args, t, a);
// Allocate space for structs replaced by pointer:
for (i = nb_args; i; i--)
if (a[i] & 1) {
SValue *arg = &vtop[i - nb_args];
int align, size = type_size(&arg->type, &align);
assert((arg->type.t & VT_BTYPE) == VT_STRUCT);
stack = (stack + align - 1) & -align;
a1[i] = stack;
stack += size;
}
stack = (stack + 15) >> 4 << 4;
if (stack >= 0x1000000) // 16Mb
tcc_error("stack size too big %lu", stack);
if (stack & 0xfff)
o(0xd10003ff | (stack & 0xfff) << 10); // sub sp,sp,#(n)
if (stack >> 12)
o(0xd14003ff | (stack >> 12) << 10);
// First pass: set all values on stack
for (i = nb_args; i; i--) {
vpushv(vtop - nb_args + i);
if (a[i] & 1) {
// struct replaced by pointer
int r = get_reg(RC_INT);
arm64_spoff(intr(r), a1[i]);
vset(&vtop->type, r | VT_LVAL, 0);
vswap();
vstore();
if (a[i] >= 32) {
// pointer on stack
r = get_reg(RC_INT);
arm64_spoff(intr(r), a1[i]);
arm64_strx(3, intr(r), 31, (a[i] - 32) >> 1 << 1);
}
}
else if (a[i] >= 32) {
// value on stack
if ((vtop->type.t & VT_BTYPE) == VT_STRUCT) {
int r = get_reg(RC_INT);
arm64_spoff(intr(r), a[i] - 32);
vset(&vtop->type, r | VT_LVAL, 0);
vswap();
vstore();
}
else if (is_float(vtop->type.t)) {
gv(RC_FLOAT);
arm64_strv(arm64_type_size(vtop[0].type.t),
fltr(vtop[0].r), 31, a[i] - 32);
}
else {
gv(RC_INT);
arm64_strx(arm64_type_size(vtop[0].type.t),
intr(vtop[0].r), 31, a[i] - 32);
}
}
--vtop;
}
// Second pass: assign values to registers
for (i = nb_args; i; i--, vtop--) {
if (a[i] < 16 && !(a[i] & 1)) {
// value in general-purpose registers
if ((vtop->type.t & VT_BTYPE) == VT_STRUCT) {
int align, size = type_size(&vtop->type, &align);
if (size) {
vtop->type.t = VT_PTR;
gaddrof();
gv(RC_R(a[i] / 2));
arm64_ldrs(a[i] / 2, size);
}
}
else
gv(RC_R(a[i] / 2));
}
else if (a[i] < 16)
// struct replaced by pointer in register
arm64_spoff(a[i] / 2, a1[i]);
else if (a[i] < 32) {
// value in floating-point registers
if ((vtop->type.t & VT_BTYPE) == VT_STRUCT) {
uint32_t j, sz, n = arm64_hfa(&vtop->type, &sz);
vtop->type.t = VT_PTR;
gaddrof();
gv(RC_R30);
for (j = 0; j < n; j++)
o(0x3d4003c0 |
(sz & 16) << 19 | -(sz & 8) << 27 | (sz & 4) << 29 |
(a[i] / 2 - 8 + j) |
j << 10); // ldr ([sdq])(*),[x30,#(j * sz)]
}
else
gv(RC_F(a[i] / 2 - 8));
}
}
if ((return_type->t & VT_BTYPE) == VT_STRUCT) {
if (a[0] == 1) {
// indirect return: set x8 and discard the stack value
gv(RC_R(8));
--vtop;
}
else
// return in registers: keep the address for after the call
vswap();
}
save_regs(0);
arm64_gen_bl_or_b(0);
--vtop;
if (stack & 0xfff)
o(0x910003ff | (stack & 0xfff) << 10); // add sp,sp,#(n)
if (stack >> 12)
o(0x914003ff | (stack >> 12) << 10);
{
int rt = return_type->t;
int bt = rt & VT_BTYPE;
if (bt == VT_STRUCT && !(a[0] & 1)) {
// A struct was returned in registers, so write it out:
gv(RC_R(8));
--vtop;
if (a[0] == 0) {
int align, size = type_size(return_type, &align);
assert(size <= 16);
if (size > 8)
o(0xa9000500); // stp x0,x1,[x8]
else if (size)
arm64_strx(size > 4 ? 3 : size > 2 ? 2 : size > 1, 0, 8, 0);
}
else if (a[0] == 16) {
uint32_t j, sz, n = arm64_hfa(return_type, &sz);
for (j = 0; j < n; j++)
o(0x3d000100 |
(sz & 16) << 19 | -(sz & 8) << 27 | (sz & 4) << 29 |
(a[i] / 2 - 8 + j) |
j << 10); // str ([sdq])(*),[x8,#(j * sz)]
}
}
}
tcc_free(a1);
tcc_free(a);
tcc_free(t);
}
static unsigned long arm64_func_va_list_stack;
static int arm64_func_va_list_gr_offs;
static int arm64_func_va_list_vr_offs;
static int arm64_func_sub_sp_offset;
ST_FUNC void gfunc_prolog(Sym *func_sym)
{
CType *func_type = &func_sym->type;
int n = 0;
int i = 0;
Sym *sym;
CType **t;
unsigned long *a;
func_vc = 144; // offset of where x8 is stored
for (sym = func_type->ref; sym; sym = sym->next)
++n;
t = n ? tcc_malloc(n * sizeof(*t)) : NULL;
a = n ? tcc_malloc(n * sizeof(*a)) : NULL;
for (sym = func_type->ref; sym; sym = sym->next)
t[i++] = &sym->type;
arm64_func_va_list_stack = arm64_pcs(n - 1, t, a);
o(0xa9b27bfd); // stp x29,x30,[sp,#-224]!
o(0xad0087e0); // stp q0,q1,[sp,#16]
o(0xad018fe2); // stp q2,q3,[sp,#48]
o(0xad0297e4); // stp q4,q5,[sp,#80]
o(0xad039fe6); // stp q6,q7,[sp,#112]
o(0xa90923e8); // stp x8,x8,[sp,#144]
o(0xa90a07e0); // stp x0,x1,[sp,#160]
o(0xa90b0fe2); // stp x2,x3,[sp,#176]
o(0xa90c17e4); // stp x4,x5,[sp,#192]
o(0xa90d1fe6); // stp x6,x7,[sp,#208]
arm64_func_va_list_gr_offs = -64;
arm64_func_va_list_vr_offs = -128;
for (i = 1, sym = func_type->ref->next; sym; i++, sym = sym->next) {
int off = (a[i] < 16 ? 160 + a[i] / 2 * 8 :
a[i] < 32 ? 16 + (a[i] - 16) / 2 * 16 :
224 + ((a[i] - 32) >> 1 << 1));
sym_push(sym->v & ~SYM_FIELD, &sym->type,
(a[i] & 1 ? VT_LLOCAL : VT_LOCAL) | VT_LVAL,
off);
if (a[i] < 16) {
int align, size = type_size(&sym->type, &align);
arm64_func_va_list_gr_offs = (a[i] / 2 - 7 +
(!(a[i] & 1) && size > 8)) * 8;
}
else if (a[i] < 32) {
uint32_t hfa = arm64_hfa(&sym->type, 0);
arm64_func_va_list_vr_offs = (a[i] / 2 - 16 +
(hfa ? hfa : 1)) * 16;
}
// HFAs of float and double need to be written differently:
if (16 <= a[i] && a[i] < 32 && (sym->type.t & VT_BTYPE) == VT_STRUCT) {
uint32_t j, sz, k = arm64_hfa(&sym->type, &sz);
if (sz < 16)
for (j = 0; j < k; j++) {
o(0x3d0003e0 | -(sz & 8) << 27 | (sz & 4) << 29 |
((a[i] - 16) / 2 + j) | (off / sz + j) << 10);
// str ([sdq])(*),[sp,#(j * sz)]
}
}
}
tcc_free(a);
tcc_free(t);
o(0x910003fd); // mov x29,sp
arm64_func_sub_sp_offset = ind;
// In gfunc_epilog these will be replaced with code to decrement SP:
o(0xd503201f); // nop
o(0xd503201f); // nop
loc = 0;
#ifdef CONFIG_TCC_BCHECK
if (tcc_state->do_bounds_check)
gen_bounds_prolog();
#endif
}
ST_FUNC void gen_va_start(void)
{
int r;
--vtop; // we don't need the "arg"
gaddrof();
r = intr(gv(RC_INT));
if (arm64_func_va_list_stack) {
//xx could use add (immediate) here
arm64_movimm(30, arm64_func_va_list_stack + 224);
o(0x8b1e03be); // add x30,x29,x30
}
else
o(0x910383be); // add x30,x29,#224
o(0xf900001e | r << 5); // str x30,[x(r)]
if (arm64_func_va_list_gr_offs) {
if (arm64_func_va_list_stack)
o(0x910383be); // add x30,x29,#224
o(0xf900041e | r << 5); // str x30,[x(r),#8]
}
if (arm64_func_va_list_vr_offs) {
o(0x910243be); // add x30,x29,#144
o(0xf900081e | r << 5); // str x30,[x(r),#16]
}
arm64_movimm(30, arm64_func_va_list_gr_offs);
o(0xb900181e | r << 5); // str w30,[x(r),#24]
arm64_movimm(30, arm64_func_va_list_vr_offs);
o(0xb9001c1e | r << 5); // str w30,[x(r),#28]
--vtop;
}
ST_FUNC void gen_va_arg(CType *t)
{
int align, size = type_size(t, &align);
unsigned fsize, hfa = arm64_hfa(t, &fsize);
uint32_t r0, r1;
if (is_float(t->t)) {
hfa = 1;
fsize = size;
}
gaddrof();
r0 = intr(gv(RC_INT));
r1 = get_reg(RC_INT);
vtop[0].r = r1 | VT_LVAL;
r1 = intr(r1);
if (!hfa) {
uint32_t n = size > 16 ? 8 : (size + 7) & -8;
o(0xb940181e | r0 << 5); // ldr w30,[x(r0),#24] // __gr_offs
if (align == 16) {
assert(0); // this path untested but needed for __uint128_t
o(0x11003fde); // add w30,w30,#15
o(0x121c6fde); // and w30,w30,#-16
}
o(0x310003c0 | r1 | n << 10); // adds w(r1),w30,#(n)
o(0x540000ad); // b.le .+20
o(0xf9400000 | r1 | r0 << 5); // ldr x(r1),[x(r0)] // __stack
o(0x9100001e | r1 << 5 | n << 10); // add x30,x(r1),#(n)
o(0xf900001e | r0 << 5); // str x30,[x(r0)] // __stack
o(0x14000004); // b .+16
o(0xb9001800 | r1 | r0 << 5); // str w(r1),[x(r0),#24] // __gr_offs
o(0xf9400400 | r1 | r0 << 5); // ldr x(r1),[x(r0),#8] // __gr_top
o(0x8b3ec000 | r1 | r1 << 5); // add x(r1),x(r1),w30,sxtw
if (size > 16)
o(0xf9400000 | r1 | r1 << 5); // ldr x(r1),[x(r1)]
}
else {
uint32_t rsz = hfa << 4;
uint32_t ssz = (size + 7) & -(uint32_t)8;
uint32_t b1, b2;
o(0xb9401c1e | r0 << 5); // ldr w30,[x(r0),#28] // __vr_offs
o(0x310003c0 | r1 | rsz << 10); // adds w(r1),w30,#(rsz)
b1 = ind; o(0x5400000d); // b.le lab1
o(0xf9400000 | r1 | r0 << 5); // ldr x(r1),[x(r0)] // __stack
if (fsize == 16) {
o(0x91003c00 | r1 | r1 << 5); // add x(r1),x(r1),#15
o(0x927cec00 | r1 | r1 << 5); // and x(r1),x(r1),#-16
}
o(0x9100001e | r1 << 5 | ssz << 10); // add x30,x(r1),#(ssz)
o(0xf900001e | r0 << 5); // str x30,[x(r0)] // __stack
b2 = ind; o(0x14000000); // b lab2
// lab1:
write32le(cur_text_section->data + b1, 0x5400000d | (ind - b1) << 3);
o(0xb9001c00 | r1 | r0 << 5); // str w(r1),[x(r0),#28] // __vr_offs
o(0xf9400800 | r1 | r0 << 5); // ldr x(r1),[x(r0),#16] // __vr_top
if (hfa == 1 || fsize == 16)
o(0x8b3ec000 | r1 | r1 << 5); // add x(r1),x(r1),w30,sxtw
else {
// We need to change the layout of this HFA.
// Get some space on the stack using global variable "loc":
loc = (loc - size) & -(uint32_t)align;
o(0x8b3ec000 | 30 | r1 << 5); // add x30,x(r1),w30,sxtw
arm64_movimm(r1, loc);
o(0x8b0003a0 | r1 | r1 << 16); // add x(r1),x29,x(r1)
o(0x4c402bdc | (uint32_t)fsize << 7 |
(uint32_t)(hfa == 2) << 15 |
(uint32_t)(hfa == 3) << 14); // ld1 {v28.(4s|2d),...},[x30]
o(0x0d00801c | r1 << 5 | (fsize == 8) << 10 |
(uint32_t)(hfa != 2) << 13 |
(uint32_t)(hfa != 3) << 21); // st(hfa) {v28.(s|d),...}[0],[x(r1)]
}
// lab2:
write32le(cur_text_section->data + b2, 0x14000000 | (ind - b2) >> 2);
}
}
ST_FUNC int gfunc_sret(CType *vt, int variadic, CType *ret,
int *align, int *regsize)
{
return 0;
}
ST_FUNC void gfunc_return(CType *func_type)
{
CType *t = func_type;
unsigned long a;
arm64_pcs(0, &t, &a);
switch (a) {
case -1:
break;
case 0:
if ((func_type->t & VT_BTYPE) == VT_STRUCT) {
int align, size = type_size(func_type, &align);
gaddrof();
gv(RC_R(0));
arm64_ldrs(0, size);
}
else
gv(RC_IRET);
break;
case 1: {
CType type = *func_type;
mk_pointer(&type);
vset(&type, VT_LOCAL | VT_LVAL, func_vc);
indir();
vswap();
vstore();
break;
}
case 16:
if ((func_type->t & VT_BTYPE) == VT_STRUCT) {
uint32_t j, sz, n = arm64_hfa(&vtop->type, &sz);
gaddrof();
gv(RC_R(0));
for (j = 0; j < n; j++)
o(0x3d400000 |
(sz & 16) << 19 | -(sz & 8) << 27 | (sz & 4) << 29 |
j | j << 10); // ldr ([sdq])(*),[x0,#(j * sz)]
}
else
gv(RC_FRET);
break;
default:
assert(0);
}
vtop--;
}
ST_FUNC void gfunc_epilog(void)
{
#ifdef CONFIG_TCC_BCHECK
if (tcc_state->do_bounds_check)
gen_bounds_epilog();
#endif
if (loc) {
// Insert instructions to subtract size of stack frame from SP.
unsigned char *ptr = cur_text_section->data + arm64_func_sub_sp_offset;
uint64_t diff = (-loc + 15) & ~15;
if (!(diff >> 24)) {
if (diff & 0xfff) // sub sp,sp,#(diff & 0xfff)
write32le(ptr, 0xd10003ff | (diff & 0xfff) << 10);
if (diff >> 12) // sub sp,sp,#(diff >> 12),lsl #12
write32le(ptr + 4, 0xd14003ff | (diff >> 12) << 10);
}
else {
// In this case we may subtract more than necessary,
// but always less than 17/16 of what we were aiming for.
int i = 0;
int j = 0;
while (diff >> 20) {
diff = (diff + 0xffff) >> 16;
++i;
}
while (diff >> 16) {
diff = (diff + 1) >> 1;
++j;
}
write32le(ptr, 0xd2800010 | diff << 5 | i << 21);
// mov x16,#(diff),lsl #(16 * i)
write32le(ptr + 4, 0xcb3063ff | j << 10);
// sub sp,sp,x16,lsl #(j)
}
}
o(0x910003bf); // mov sp,x29
o(0xa8ce7bfd); // ldp x29,x30,[sp],#224
o(0xd65f03c0); // ret
}
ST_FUNC void gen_fill_nops(int bytes)
{
if ((bytes & 3))
tcc_error("alignment of code section not multiple of 4");
while (bytes > 0) {
o(0xd503201f); // nop
bytes -= 4;
}
}
// Generate forward branch to label:
ST_FUNC int gjmp(int t)
{
int r = ind;
if (nocode_wanted)
return t;
o(t);
return r;
}
// Generate branch to known address:
ST_FUNC void gjmp_addr(int a)
{
assert(a - ind + 0x8000000 < 0x10000000);
o(0x14000000 | ((a - ind) >> 2 & 0x3ffffff));
}
ST_FUNC int gjmp_append(int n, int t)
{
void *p;
/* insert vtop->c jump list in t */
if (n) {
uint32_t n1 = n, n2;
while ((n2 = read32le(p = cur_text_section->data + n1)))
n1 = n2;
write32le(p, t);
t = n;
}
return t;
}
void arm64_vset_VT_CMP(int op)
{
if (op >= TOK_ULT && op <= TOK_GT) {
vtop->cmp_r = vtop->r;
vset_VT_CMP(0x80);
}
}
static void arm64_gen_opil(int op, uint32_t l);
static void arm64_load_cmp(int r, SValue *sv)
{
sv->r = sv->cmp_r;
if (sv->c.i & 1) {
vpushi(1);
arm64_gen_opil('^', 0);
}
if (r != sv->r) {
load(r, sv);
sv->r = r;
}
}
ST_FUNC int gjmp_cond(int op, int t)
{
int bt = vtop->type.t & VT_BTYPE;
int inv = op & 1;
vtop->r = vtop->cmp_r;
if (bt == VT_LDOUBLE) {
uint32_t a, b, f = fltr(gv(RC_FLOAT));
a = get_reg(RC_INT);
vpushi(0);
vtop[0].r = a;
b = get_reg(RC_INT);
a = intr(a);
b = intr(b);
o(0x4e083c00 | a | f << 5); // mov x(a),v(f).d[0]
o(0x4e183c00 | b | f << 5); // mov x(b),v(f).d[1]
o(0xaa000400 | a | a << 5 | b << 16); // orr x(a),x(a),x(b),lsl #1
o(0xb4000040 | a | !!inv << 24); // cbz/cbnz x(a),.+8
--vtop;
}
else if (bt == VT_FLOAT || bt == VT_DOUBLE) {
uint32_t a = fltr(gv(RC_FLOAT));
o(0x1e202008 | a << 5 | (bt != VT_FLOAT) << 22); // fcmp
o(0x54000040 | !!inv); // b.eq/b.ne .+8
}
else {
uint32_t ll = (bt == VT_PTR || bt == VT_LLONG);
uint32_t a = intr(gv(RC_INT));
o(0x34000040 | a | !!inv << 24 | ll << 31); // cbz/cbnz wA,.+8
}
return gjmp(t);
}
static int arm64_iconst(uint64_t *val, SValue *sv)
{
if ((sv->r & (VT_VALMASK | VT_LVAL | VT_SYM)) != VT_CONST)
return 0;
if (val) {
int t = sv->type.t;
int bt = t & VT_BTYPE;
*val = ((bt == VT_LLONG || bt == VT_PTR) ? sv->c.i :
(uint32_t)sv->c.i |
(t & VT_UNSIGNED ? 0 : -(sv->c.i & 0x80000000)));
}
return 1;
}
static int arm64_gen_opic(int op, uint32_t l, int rev, uint64_t val,
uint32_t x, uint32_t a)
{
if (op == '-' && !rev) {
val = -val;
op = '+';
}
val = l ? val : (uint32_t)val;
switch (op) {
case '+': {
uint32_t s = l ? val >> 63 : val >> 31;
val = s ? -val : val;
val = l ? val : (uint32_t)val;
if (!(val & ~(uint64_t)0xfff))
o(0x11000000 | l << 31 | s << 30 | x | a << 5 | val << 10);
else if (!(val & ~(uint64_t)0xfff000))
o(0x11400000 | l << 31 | s << 30 | x | a << 5 | val >> 12 << 10);
else {
arm64_movimm(30, val); // use x30
o(0x0b1e0000 | l << 31 | s << 30 | x | a << 5);
}
return 1;
}
case '-':
if (!val)
o(0x4b0003e0 | l << 31 | x | a << 16); // neg
else if (val == (l ? (uint64_t)-1 : (uint32_t)-1))
o(0x2a2003e0 | l << 31 | x | a << 16); // mvn
else {
arm64_movimm(30, val); // use x30
o(0x4b0003c0 | l << 31 | x | a << 16); // sub
}
return 1;
case '^':
if (val == -1 || (val == 0xffffffff && !l)) {
o(0x2a2003e0 | l << 31 | x | a << 16); // mvn
return 1;
}
// fall through
case '&':
case '|': {
int e = arm64_encode_bimm64(l ? val : val | val << 32);
if (e < 0)
return 0;
o((op == '&' ? 0x12000000 :
op == '|' ? 0x32000000 : 0x52000000) |
l << 31 | x | a << 5 | (uint32_t)e << 10);
return 1;
}
case TOK_SAR:
case TOK_SHL:
case TOK_SHR: {
uint32_t n = 32 << l;
val = val & (n - 1);
if (rev)
return 0;
if (!val) {
// tcc_warning("shift count >= width of type");
o(0x2a0003e0 | l << 31 | a << 16);
return 1;
}
else if (op == TOK_SHL)
o(0x53000000 | l << 31 | l << 22 | x | a << 5 |
(n - val) << 16 | (n - 1 - val) << 10); // lsl
else
o(0x13000000 | (op == TOK_SHR) << 30 | l << 31 | l << 22 |
x | a << 5 | val << 16 | (n - 1) << 10); // lsr/asr
return 1;
}
}
return 0;
}
static void arm64_gen_opil(int op, uint32_t l)
{
uint32_t x, a, b;
// Special treatment for operations with a constant operand:
{
uint64_t val;
int rev = 1;
if (arm64_iconst(0, &vtop[0])) {
vswap();
rev = 0;
}
if (arm64_iconst(&val, &vtop[-1])) {
gv(RC_INT);
a = intr(vtop[0].r);
--vtop;
x = get_reg(RC_INT);
++vtop;
if (arm64_gen_opic(op, l, rev, val, intr(x), a)) {
vtop[0].r = x;
vswap();
--vtop;
return;
}
}
if (!rev)
vswap();
}
gv2(RC_INT, RC_INT);
assert(vtop[-1].r < VT_CONST && vtop[0].r < VT_CONST);
a = intr(vtop[-1].r);
b = intr(vtop[0].r);
vtop -= 2;
x = get_reg(RC_INT);
++vtop;
vtop[0].r = x;
x = intr(x);
switch (op) {
case '%':
// Use x30 for quotient:
o(0x1ac00c00 | l << 31 | 30 | a << 5 | b << 16); // sdiv
o(0x1b008000 | l << 31 | x | (uint32_t)30 << 5 |
b << 16 | a << 10); // msub
break;
case '&':
o(0x0a000000 | l << 31 | x | a << 5 | b << 16); // and
break;
case '*':
o(0x1b007c00 | l << 31 | x | a << 5 | b << 16); // mul
break;
case '+':
o(0x0b000000 | l << 31 | x | a << 5 | b << 16); // add
break;
case '-':
o(0x4b000000 | l << 31 | x | a << 5 | b << 16); // sub
break;
case '/':
o(0x1ac00c00 | l << 31 | x | a << 5 | b << 16); // sdiv
break;
case '^':
o(0x4a000000 | l << 31 | x | a << 5 | b << 16); // eor
break;
case '|':
o(0x2a000000 | l << 31 | x | a << 5 | b << 16); // orr
break;
case TOK_EQ:
o(0x6b00001f | l << 31 | a << 5 | b << 16); // cmp
o(0x1a9f17e0 | x); // cset wA,eq
break;
case TOK_GE:
o(0x6b00001f | l << 31 | a << 5 | b << 16); // cmp
o(0x1a9fb7e0 | x); // cset wA,ge
break;
case TOK_GT:
o(0x6b00001f | l << 31 | a << 5 | b << 16); // cmp
o(0x1a9fd7e0 | x); // cset wA,gt
break;
case TOK_LE:
o(0x6b00001f | l << 31 | a << 5 | b << 16); // cmp
o(0x1a9fc7e0 | x); // cset wA,le
break;
case TOK_LT:
o(0x6b00001f | l << 31 | a << 5 | b << 16); // cmp
o(0x1a9fa7e0 | x); // cset wA,lt
break;
case TOK_NE:
o(0x6b00001f | l << 31 | a << 5 | b << 16); // cmp
o(0x1a9f07e0 | x); // cset wA,ne
break;
case TOK_SAR:
o(0x1ac02800 | l << 31 | x | a << 5 | b << 16); // asr
break;
case TOK_SHL:
o(0x1ac02000 | l << 31 | x | a << 5 | b << 16); // lsl
break;
case TOK_SHR:
o(0x1ac02400 | l << 31 | x | a << 5 | b << 16); // lsr
break;
case TOK_UDIV:
case TOK_PDIV:
o(0x1ac00800 | l << 31 | x | a << 5 | b << 16); // udiv
break;
case TOK_UGE:
o(0x6b00001f | l << 31 | a << 5 | b << 16); // cmp
o(0x1a9f37e0 | x); // cset wA,cs
break;
case TOK_UGT:
o(0x6b00001f | l << 31 | a << 5 | b << 16); // cmp
o(0x1a9f97e0 | x); // cset wA,hi
break;
case TOK_ULT:
o(0x6b00001f | l << 31 | a << 5 | b << 16); // cmp
o(0x1a9f27e0 | x); // cset wA,cc
break;
case TOK_ULE:
o(0x6b00001f | l << 31 | a << 5 | b << 16); // cmp
o(0x1a9f87e0 | x); // cset wA,ls
break;
case TOK_UMOD:
// Use x30 for quotient:
o(0x1ac00800 | l << 31 | 30 | a << 5 | b << 16); // udiv
o(0x1b008000 | l << 31 | x | (uint32_t)30 << 5 |
b << 16 | a << 10); // msub
break;
default:
assert(0);
}
}
ST_FUNC void gen_opi(int op)
{
arm64_gen_opil(op, 0);
arm64_vset_VT_CMP(op);
}
ST_FUNC void gen_opl(int op)
{
arm64_gen_opil(op, 1);
arm64_vset_VT_CMP(op);
}
ST_FUNC void gen_opf(int op)
{
uint32_t x, a, b, dbl;
if (vtop[0].type.t == VT_LDOUBLE) {
CType type = vtop[0].type;
int func = 0;
int cond = -1;
switch (op) {
case '*': func = TOK___multf3; break;
case '+': func = TOK___addtf3; break;
case '-': func = TOK___subtf3; break;
case '/': func = TOK___divtf3; break;
case TOK_EQ: func = TOK___eqtf2; cond = 1; break;
case TOK_NE: func = TOK___netf2; cond = 0; break;
case TOK_LT: func = TOK___lttf2; cond = 10; break;
case TOK_GE: func = TOK___getf2; cond = 11; break;
case TOK_LE: func = TOK___letf2; cond = 12; break;
case TOK_GT: func = TOK___gttf2; cond = 13; break;
default: assert(0); break;
}
vpush_global_sym(&func_old_type, func);
vrott(3);
gfunc_call(2);
vpushi(0);
vtop->r = cond < 0 ? REG_FRET : REG_IRET;
if (cond < 0)
vtop->type = type;
else {
o(0x7100001f); // cmp w0,#0
o(0x1a9f07e0 | (uint32_t)cond << 12); // cset w0,(cond)
}
return;
}
dbl = vtop[0].type.t != VT_FLOAT;
gv2(RC_FLOAT, RC_FLOAT);
assert(vtop[-1].r < VT_CONST && vtop[0].r < VT_CONST);
a = fltr(vtop[-1].r);
b = fltr(vtop[0].r);
vtop -= 2;
switch (op) {
case TOK_EQ: case TOK_NE:
case TOK_LT: case TOK_GE: case TOK_LE: case TOK_GT:
x = get_reg(RC_INT);
++vtop;
vtop[0].r = x;
x = intr(x);
break;
default:
x = get_reg(RC_FLOAT);
++vtop;
vtop[0].r = x;
x = fltr(x);
break;
}
switch (op) {
case '*':
o(0x1e200800 | dbl << 22 | x | a << 5 | b << 16); // fmul
break;
case '+':
o(0x1e202800 | dbl << 22 | x | a << 5 | b << 16); // fadd
break;
case '-':
o(0x1e203800 | dbl << 22 | x | a << 5 | b << 16); // fsub
break;
case '/':
o(0x1e201800 | dbl << 22 | x | a << 5 | b << 16); // fdiv
break;
case TOK_EQ:
o(0x1e202000 | dbl << 22 | a << 5 | b << 16); // fcmp
o(0x1a9f17e0 | x); // cset w(x),eq
break;
case TOK_GE:
o(0x1e202000 | dbl << 22 | a << 5 | b << 16); // fcmp
o(0x1a9fb7e0 | x); // cset w(x),ge
break;
case TOK_GT:
o(0x1e202000 | dbl << 22 | a << 5 | b << 16); // fcmp
o(0x1a9fd7e0 | x); // cset w(x),gt
break;
case TOK_LE:
o(0x1e202000 | dbl << 22 | a << 5 | b << 16); // fcmp
o(0x1a9f87e0 | x); // cset w(x),ls
break;
case TOK_LT:
o(0x1e202000 | dbl << 22 | a << 5 | b << 16); // fcmp
o(0x1a9f57e0 | x); // cset w(x),mi
break;
case TOK_NE:
o(0x1e202000 | dbl << 22 | a << 5 | b << 16); // fcmp
o(0x1a9f07e0 | x); // cset w(x),ne
break;
default:
assert(0);
}
arm64_vset_VT_CMP(op);
}
// Generate sign extension from 32 to 64 bits:
ST_FUNC void gen_cvt_sxtw(void)
{
uint32_t r = intr(gv(RC_INT));
o(0x93407c00 | r | r << 5); // sxtw x(r),w(r)
}
/* char/short to int conversion */
ST_FUNC void gen_cvt_csti(int t)
{
int r = intr(gv(RC_INT));
o(0x13001c00
| ((t & VT_BTYPE) == VT_SHORT) << 13
| (uint32_t)!!(t & VT_UNSIGNED) << 30
| r | r << 5); // [su]xt[bh] w(r),w(r)
}
ST_FUNC void gen_cvt_itof(int t)
{
if (t == VT_LDOUBLE) {
int f = vtop->type.t;
int func = (f & VT_BTYPE) == VT_LLONG ?
(f & VT_UNSIGNED ? TOK___floatunditf : TOK___floatditf) :
(f & VT_UNSIGNED ? TOK___floatunsitf : TOK___floatsitf);
vpush_global_sym(&func_old_type, func);
vrott(2);
gfunc_call(1);
vpushi(0);
vtop->type.t = t;
vtop->r = REG_FRET;
return;
}
else {
int d, n = intr(gv(RC_INT));
int s = !(vtop->type.t & VT_UNSIGNED);
uint32_t l = ((vtop->type.t & VT_BTYPE) == VT_LLONG);
--vtop;
d = get_reg(RC_FLOAT);
++vtop;
vtop[0].r = d;
o(0x1e220000 | (uint32_t)!s << 16 |
(uint32_t)(t != VT_FLOAT) << 22 | fltr(d) |
l << 31 | n << 5); // [us]cvtf [sd](d),[wx](n)
}
}
ST_FUNC void gen_cvt_ftoi(int t)
{
if ((vtop->type.t & VT_BTYPE) == VT_LDOUBLE) {
int func = (t & VT_BTYPE) == VT_LLONG ?
(t & VT_UNSIGNED ? TOK___fixunstfdi : TOK___fixtfdi) :
(t & VT_UNSIGNED ? TOK___fixunstfsi : TOK___fixtfsi);
vpush_global_sym(&func_old_type, func);
vrott(2);
gfunc_call(1);
vpushi(0);
vtop->type.t = t;
vtop->r = REG_IRET;
return;
}
else {
int d, n = fltr(gv(RC_FLOAT));
uint32_t l = ((vtop->type.t & VT_BTYPE) != VT_FLOAT);
--vtop;
d = get_reg(RC_INT);
++vtop;
vtop[0].r = d;
o(0x1e380000 |
(uint32_t)!!(t & VT_UNSIGNED) << 16 |
(uint32_t)((t & VT_BTYPE) == VT_LLONG) << 31 | intr(d) |
l << 22 | n << 5); // fcvtz[su] [wx](d),[sd](n)
}
}
ST_FUNC void gen_cvt_ftof(int t)
{
int f = vtop[0].type.t & VT_BTYPE;
assert(t == VT_FLOAT || t == VT_DOUBLE || t == VT_LDOUBLE);
assert(f == VT_FLOAT || f == VT_DOUBLE || f == VT_LDOUBLE);
if (t == f)
return;
if (t == VT_LDOUBLE || f == VT_LDOUBLE) {
int func = (t == VT_LDOUBLE) ?
(f == VT_FLOAT ? TOK___extendsftf2 : TOK___extenddftf2) :
(t == VT_FLOAT ? TOK___trunctfsf2 : TOK___trunctfdf2);
vpush_global_sym(&func_old_type, func);
vrott(2);
gfunc_call(1);
vpushi(0);
vtop->type.t = t;
vtop->r = REG_FRET;
}
else {
int x, a;
gv(RC_FLOAT);
assert(vtop[0].r < VT_CONST);
a = fltr(vtop[0].r);
--vtop;
x = get_reg(RC_FLOAT);
++vtop;
vtop[0].r = x;
x = fltr(x);
if (f == VT_FLOAT)
o(0x1e22c000 | x | a << 5); // fcvt d(x),s(a)
else
o(0x1e624000 | x | a << 5); // fcvt s(x),d(a)
}
}
ST_FUNC void ggoto(void)
{
arm64_gen_bl_or_b(1);
--vtop;
}
ST_FUNC void gen_clear_cache(void)
{
uint32_t beg, end, dsz, isz, p, lab1, b1;
gv2(RC_INT, RC_INT);
vpushi(0);
vtop->r = get_reg(RC_INT);
vpushi(0);
vtop->r = get_reg(RC_INT);
vpushi(0);
vtop->r = get_reg(RC_INT);
beg = intr(vtop[-4].r); // x0
end = intr(vtop[-3].r); // x1
dsz = intr(vtop[-2].r); // x2
isz = intr(vtop[-1].r); // x3
p = intr(vtop[0].r); // x4
vtop -= 5;
o(0xd53b0020 | isz); // mrs x(isz),ctr_el0
o(0x52800080 | p); // mov w(p),#4
o(0x53104c00 | dsz | isz << 5); // ubfx w(dsz),w(isz),#16,#4
o(0x1ac02000 | dsz | p << 5 | dsz << 16); // lsl w(dsz),w(p),w(dsz)
o(0x12000c00 | isz | isz << 5); // and w(isz),w(isz),#15
o(0x1ac02000 | isz | p << 5 | isz << 16); // lsl w(isz),w(p),w(isz)
o(0x51000400 | p | dsz << 5); // sub w(p),w(dsz),#1
o(0x8a240004 | p | beg << 5 | p << 16); // bic x(p),x(beg),x(p)
b1 = ind; o(0x14000000); // b
lab1 = ind;
o(0xd50b7b20 | p); // dc cvau,x(p)
o(0x8b000000 | p | p << 5 | dsz << 16); // add x(p),x(p),x(dsz)
write32le(cur_text_section->data + b1, 0x14000000 | (ind - b1) >> 2);
o(0xeb00001f | p << 5 | end << 16); // cmp x(p),x(end)
o(0x54ffffa3 | ((lab1 - ind) << 3 & 0xffffe0)); // b.cc lab1
o(0xd5033b9f); // dsb ish
o(0x51000400 | p | isz << 5); // sub w(p),w(isz),#1
o(0x8a240004 | p | beg << 5 | p << 16); // bic x(p),x(beg),x(p)
b1 = ind; o(0x14000000); // b
lab1 = ind;
o(0xd50b7520 | p); // ic ivau,x(p)
o(0x8b000000 | p | p << 5 | isz << 16); // add x(p),x(p),x(isz)
write32le(cur_text_section->data + b1, 0x14000000 | (ind - b1) >> 2);
o(0xeb00001f | p << 5 | end << 16); // cmp x(p),x(end)
o(0x54ffffa3 | ((lab1 - ind) << 3 & 0xffffe0)); // b.cc lab1
o(0xd5033b9f); // dsb ish
o(0xd5033fdf); // isb
}
ST_FUNC void gen_vla_sp_save(int addr) {
uint32_t r = intr(get_reg(RC_INT));
o(0x910003e0 | r); // mov x(r),sp
arm64_strx(3, r, 29, addr);
}
ST_FUNC void gen_vla_sp_restore(int addr) {
// Use x30 because this function can be called when there
// is a live return value in x0 but there is nothing on
// the value stack to prevent get_reg from returning x0.
uint32_t r = 30;
arm64_ldrx(0, 3, r, 29, addr);
o(0x9100001f | r << 5); // mov sp,x(r)
}
ST_FUNC void gen_vla_alloc(CType *type, int align) {
uint32_t r;
#if defined(CONFIG_TCC_BCHECK)
if (tcc_state->do_bounds_check)
vpushv(vtop);
#endif
r = intr(gv(RC_INT));
#if defined(CONFIG_TCC_BCHECK)
if (tcc_state->do_bounds_check)
o(0x91004000 | r | r << 5); // add x(r),x(r),#15+1
else
#endif
o(0x91003c00 | r | r << 5); // add x(r),x(r),#15
o(0x927cec00 | r | r << 5); // bic x(r),x(r),#15
o(0xcb2063ff | r << 16); // sub sp,sp,x(r)
vpop();
#if defined(CONFIG_TCC_BCHECK)
if (tcc_state->do_bounds_check) {
vpushi(0);
vtop->r = TREG_R(0);
o(0x910003e0 | vtop->r); // mov r0,sp
vswap();
vpush_global_sym(&func_old_type, TOK___bound_new_region);
vrott(3);
gfunc_call(2);
func_bound_add_epilog = 1;
}
#endif
}
/* end of A64 code generator */
/*************************************************************/
#endif
/*************************************************************/
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