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riscv64-gen.c
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riscv64-gen.c
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#ifdef TARGET_DEFS_ONLY
// Number of registers available to allocator:
#define NB_REGS 19 // x10-x17 aka a0-a7, f10-f17 aka fa0-fa7, xxx, ra, sp
#define NB_ASM_REGS 32
#define CONFIG_TCC_ASM
#define TREG_R(x) (x) // x = 0..7
#define TREG_F(x) (x + 8) // 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..7
#define RC_F(x) (1 << (10 + (x))) // x = 0..7
#define RC_IRET (RC_R(0)) // int return register class
#define RC_IRE2 (RC_R(1)) // int 2nd 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_IRE2 (TREG_R(1)) // int 2nd 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
#else
#define USING_GLOBALS
#include "tcc.h"
#include <assert.h>
ST_DATA const char * const target_machine_defs =
"__riscv\0"
"__riscv_xlen 64\0"
"__riscv_flen 64\0"
"__riscv_div\0"
"__riscv_mul\0"
"__riscv_fdiv\0"
"__riscv_fsqrt\0"
"__riscv_float_abi_double\0"
;
#define XLEN 8
#define TREG_RA 17
#define TREG_SP 18
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_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),
0,
1 << TREG_RA,
1 << TREG_SP
};
#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
static int ireg(int r)
{
if (r == TREG_RA)
return 1; // ra
if (r == TREG_SP)
return 2; // sp
assert(r >= 0 && r < 8);
return r + 10; // tccrX --> aX == x(10+X)
}
static int is_ireg(int r)
{
return (unsigned)r < 8 || r == TREG_RA || r == TREG_SP;
}
static int freg(int r)
{
assert(r >= 8 && r < 16);
return r - 8 + 10; // tccfX --> faX == f(10+X)
}
static int is_freg(int r)
{
return r >= 8 && r < 16;
}
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 void EIu(uint32_t opcode, uint32_t func3,
uint32_t rd, uint32_t rs1, uint32_t imm)
{
o(opcode | (func3 << 12) | (rd << 7) | (rs1 << 15) | (imm << 20));
}
static void ER(uint32_t opcode, uint32_t func3,
uint32_t rd, uint32_t rs1, uint32_t rs2, uint32_t func7)
{
o(opcode | func3 << 12 | rd << 7 | rs1 << 15 | rs2 << 20 | func7 << 25);
}
static void EI(uint32_t opcode, uint32_t func3,
uint32_t rd, uint32_t rs1, uint32_t imm)
{
assert(! ((imm + (1 << 11)) >> 12));
EIu(opcode, func3, rd, rs1, imm);
}
static void ES(uint32_t opcode, uint32_t func3,
uint32_t rs1, uint32_t rs2, uint32_t imm)
{
assert(! ((imm + (1 << 11)) >> 12));
o(opcode | (func3 << 12) | ((imm & 0x1f) << 7) | (rs1 << 15)
| (rs2 << 20) | ((imm >> 5) << 25));
}
// 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);
uint32_t r = a - t, imm;
if ((r + (1 << 21)) & ~((1U << 22) - 2))
tcc_error("out-of-range branch chain");
imm = (((r >> 12) & 0xff) << 12)
| (((r >> 11) & 1) << 20)
| (((r >> 1) & 0x3ff) << 21)
| (((r >> 20) & 1) << 31);
write32le(ptr, r == 4 ? 0x33 : 0x6f | imm); // nop || j imm
t = next;
}
}
static int load_symofs(int r, SValue *sv, int forstore)
{
int rr, doload = 0;
int fc = sv->c.i, v = sv->r & VT_VALMASK;
if (sv->r & VT_SYM) {
Sym label = {0};
assert(v == VT_CONST);
if (sv->sym->type.t & VT_STATIC) { // XXX do this per linker relax
greloca(cur_text_section, sv->sym, ind,
R_RISCV_PCREL_HI20, sv->c.i);
sv->c.i = 0;
} else {
if (((unsigned)fc + (1 << 11)) >> 12)
tcc_error("unimp: large addend for global address (0x%lx)", (long)sv->c.i);
greloca(cur_text_section, sv->sym, ind,
R_RISCV_GOT_HI20, 0);
doload = 1;
}
label.type.t = VT_VOID | VT_STATIC;
if (!nocode_wanted)
put_extern_sym(&label, cur_text_section, ind, 0);
rr = is_ireg(r) ? ireg(r) : 5;
o(0x17 | (rr << 7)); // auipc RR, 0 %pcrel_hi(sym)+addend
greloca(cur_text_section, &label, ind,
doload || !forstore
? R_RISCV_PCREL_LO12_I : R_RISCV_PCREL_LO12_S, 0);
if (doload) {
EI(0x03, 3, rr, rr, 0); // ld RR, 0(RR)
}
} else if (v == VT_LOCAL || v == VT_LLOCAL) {
rr = 8; // s0
if (fc != sv->c.i)
tcc_error("unimp: store(giant local off) (0x%lx)", (long)sv->c.i);
if (((unsigned)fc + (1 << 11)) >> 12) {
rr = is_ireg(r) ? ireg(r) : 5; // t0
o(0x37 | (rr << 7) | ((0x800 + fc) & 0xfffff000)); //lui RR, upper(fc)
ER(0x33, 0, rr, rr, 8, 0); // add RR, RR, s0
sv->c.i = fc << 20 >> 20;
}
} else
tcc_error("uhh");
return rr;
}
static void load_large_constant(int rr, int fc, uint32_t pi)
{
if (fc < 0)
pi++;
o(0x37 | (rr << 7) | (((pi + 0x800) & 0xfffff000))); // lui RR, up(up(fc))
EI(0x13, 0, rr, rr, (int)pi << 20 >> 20); // addi RR, RR, lo(up(fc))
EI(0x13, 1, rr, rr, 12); // slli RR, RR, 12
EI(0x13, 0, rr, rr, (fc + (1 << 19)) >> 20); // addi RR, RR, up(lo(fc))
EI(0x13, 1, rr, rr, 12); // slli RR, RR, 12
fc = fc << 12 >> 12;
EI(0x13, 0, rr, rr, fc >> 8); // addi RR, RR, lo1(lo(fc))
EI(0x13, 1, rr, rr, 8); // slli RR, RR, 8
}
ST_FUNC void load(int r, SValue *sv)
{
int fr = sv->r;
int v = fr & VT_VALMASK;
int rr = is_ireg(r) ? ireg(r) : freg(r);
int fc = sv->c.i;
int bt = sv->type.t & VT_BTYPE;
int align, size;
if (fr & VT_LVAL) {
int func3, opcode = is_freg(r) ? 0x07 : 0x03, br;
size = type_size(&sv->type, &align);
assert (!is_freg(r) || bt == VT_FLOAT || bt == VT_DOUBLE);
if (bt == VT_FUNC) /* XXX should be done in generic code */
size = PTR_SIZE;
func3 = size == 1 ? 0 : size == 2 ? 1 : size == 4 ? 2 : 3;
if (size < 4 && !is_float(sv->type.t) && (sv->type.t & VT_UNSIGNED))
func3 |= 4;
if (v == VT_LOCAL || (fr & VT_SYM)) {
br = load_symofs(r, sv, 0);
fc = sv->c.i;
} else if (v < VT_CONST) {
br = ireg(v);
/*if (((unsigned)fc + (1 << 11)) >> 12)
tcc_error("unimp: load(large addend) (0x%x)", fc);*/
fc = 0; // XXX store ofs in LVAL(reg)
} else if (v == VT_LLOCAL) {
br = load_symofs(r, sv, 0);
fc = sv->c.i;
EI(0x03, 3, rr, br, fc); // ld RR, fc(BR)
br = rr;
fc = 0;
} else if (v == VT_CONST) {
int64_t si = sv->c.i;
si >>= 32;
if (si != 0) {
load_large_constant(rr, fc, si);
fc &= 0xff;
} else {
o(0x37 | (rr << 7) | ((0x800 + fc) & 0xfffff000)); //lui RR, upper(fc)
fc = fc << 20 >> 20;
}
br = rr;
} else {
tcc_error("unimp: load(non-local lval)");
}
EI(opcode, func3, rr, br, fc); // l[bhwd][u] / fl[wd] RR, fc(BR)
} else if (v == VT_CONST) {
int rb = 0, do32bit = 8, zext = 0;
assert((!is_float(sv->type.t) && is_ireg(r)) || bt == VT_LDOUBLE);
if (fr & VT_SYM) {
rb = load_symofs(r, sv, 0);
fc = sv->c.i;
do32bit = 0;
}
if (is_float(sv->type.t) && bt != VT_LDOUBLE)
tcc_error("unimp: load(float)");
if (fc != sv->c.i) {
int64_t si = sv->c.i;
si >>= 32;
if (si != 0) {
load_large_constant(rr, fc, si);
fc &= 0xff;
rb = rr;
do32bit = 0;
} else if (bt == VT_LLONG) {
/* A 32bit unsigned constant for a 64bit type.
lui always sign extends, so we need to do an explicit zext.*/
zext = 1;
}
}
if (((unsigned)fc + (1 << 11)) >> 12)
o(0x37 | (rr << 7) | ((0x800 + fc) & 0xfffff000)), rb = rr; //lui RR, upper(fc)
if (fc || (rr != rb) || do32bit || (fr & VT_SYM))
EI(0x13 | do32bit, 0, rr, rb, fc << 20 >> 20); // addi[w] R, x0|R, FC
if (zext) {
EI(0x13, 1, rr, rr, 32); // slli RR, RR, 32
EI(0x13, 5, rr, rr, 32); // srli RR, RR, 32
}
} else if (v == VT_LOCAL) {
int br = load_symofs(r, sv, 0);
assert(is_ireg(r));
fc = sv->c.i;
EI(0x13, 0, rr, br, fc); // addi R, s0, FC
} else if (v < VT_CONST) { /* reg-reg */
//assert(!fc); XXX support offseted regs
if (is_freg(r) && is_freg(v))
ER(0x53, 0, rr, freg(v), freg(v), bt == VT_DOUBLE ? 0x11 : 0x10); //fsgnj.[sd] RR, V, V == fmv.[sd] RR, V
else if (is_ireg(r) && is_ireg(v))
EI(0x13, 0, rr, ireg(v), 0); // addi RR, V, 0 == mv RR, V
else {
int func7 = is_ireg(r) ? 0x70 : 0x78;
size = type_size(&sv->type, &align);
if (size == 8)
func7 |= 1;
assert(size == 4 || size == 8);
o(0x53 | (rr << 7) | ((is_freg(v) ? freg(v) : ireg(v)) << 15)
| (func7 << 25)); // fmv.{w.x, x.w, d.x, x.d} RR, VR
}
} else if (v == VT_CMP) {
int op = vtop->cmp_op;
int a = vtop->cmp_r & 0xff;
int b = (vtop->cmp_r >> 8) & 0xff;
int inv = 0;
switch (op) {
case TOK_ULT:
case TOK_UGE:
case TOK_ULE:
case TOK_UGT:
case TOK_LT:
case TOK_GE:
case TOK_LE:
case TOK_GT:
if (op & 1) { // remove [U]GE,GT
inv = 1;
op--;
}
if ((op & 7) == 6) { // [U]LE
int t = a; a = b; b = t;
inv ^= 1;
}
ER(0x33, (op > TOK_UGT) ? 2 : 3, rr, a, b, 0); // slt[u] d, a, b
if (inv)
EI(0x13, 4, rr, rr, 1); // xori d, d, 1
break;
case TOK_NE:
case TOK_EQ:
if (rr != a || b)
ER(0x33, 0, rr, a, b, 0x20); // sub d, a, b
if (op == TOK_NE)
ER(0x33, 3, rr, 0, rr, 0); // sltu d, x0, d == snez d,d
else
EI(0x13, 3, rr, rr, 1); // sltiu d, d, 1 == seqz d,d
break;
}
} else if ((v & ~1) == VT_JMP) {
int t = v & 1;
assert(is_ireg(r));
EI(0x13, 0, rr, 0, t); // addi RR, x0, t
gjmp_addr(ind + 8);
gsym(fc);
EI(0x13, 0, rr, 0, t ^ 1); // addi RR, x0, !t
} else
tcc_error("unimp: load(non-const)");
}
ST_FUNC void store(int r, SValue *sv)
{
int fr = sv->r & VT_VALMASK;
int rr = is_ireg(r) ? ireg(r) : freg(r), ptrreg;
int fc = sv->c.i;
int bt = sv->type.t & VT_BTYPE;
int align, size = type_size(&sv->type, &align);
assert(!is_float(bt) || is_freg(r) || bt == VT_LDOUBLE);
/* long doubles are in two integer registers, but the load/store
primitives only deal with one, so do as if it's one reg. */
if (bt == VT_LDOUBLE)
size = align = 8;
if (bt == VT_STRUCT)
tcc_error("unimp: store(struct)");
if (size > 8)
tcc_error("unimp: large sized store");
assert(sv->r & VT_LVAL);
if (fr == VT_LOCAL || (sv->r & VT_SYM)) {
ptrreg = load_symofs(-1, sv, 1);
fc = sv->c.i;
} else if (fr < VT_CONST) {
ptrreg = ireg(fr);
/*if (((unsigned)fc + (1 << 11)) >> 12)
tcc_error("unimp: store(large addend) (0x%x)", fc);*/
fc = 0; // XXX support offsets regs
} else if (fr == VT_CONST) {
int64_t si = sv->c.i;
ptrreg = 8; // s0
si >>= 32;
if (si != 0) {
load_large_constant(ptrreg, fc, si);
fc &= 0xff;
} else {
o(0x37 | (ptrreg << 7) | ((0x800 + fc) & 0xfffff000)); //lui RR, upper(fc)
fc = fc << 20 >> 20;
}
} else
tcc_error("implement me: %s(!local)", __FUNCTION__);
ES(is_freg(r) ? 0x27 : 0x23, // fs... | s...
size == 1 ? 0 : size == 2 ? 1 : size == 4 ? 2 : 3, // ... [wd] | [bhwd]
ptrreg, rr, fc); // RR, fc(base)
}
static void gcall_or_jmp(int docall)
{
int tr = docall ? 1 : 5; // ra or t0
if ((vtop->r & (VT_VALMASK | VT_LVAL)) == VT_CONST &&
((vtop->r & VT_SYM) && vtop->c.i == (int)vtop->c.i)) {
/* constant symbolic case -> simple relocation */
greloca(cur_text_section, vtop->sym, ind,
R_RISCV_CALL_PLT, (int)vtop->c.i);
o(0x17 | (tr << 7)); // auipc TR, 0 %call(func)
EI(0x67, 0, tr, tr, 0);// jalr TR, r(TR)
} else if (vtop->r < VT_CONST) {
int r = ireg(vtop->r);
EI(0x67, 0, tr, r, 0); // jalr TR, 0(R)
} else {
int r = TREG_RA;
load(r, vtop);
r = ireg(r);
EI(0x67, 0, tr, r, 0); // jalr TR, 0(R)
}
}
#if defined(CONFIG_TCC_BCHECK)
static void gen_bounds_call(int v)
{
Sym *sym = external_helper_sym(v);
greloca(cur_text_section, sym, ind, R_RISCV_CALL_PLT, 0);
o(0x17 | (1 << 7)); // auipc TR, 0 %call(func)
EI(0x67, 0, 1, 1, 0); // jalr TR, r(TR)
}
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(0x00000013); /* ld a0,#lbound section pointer */
o(0x00000013);
o(0x00000013); /* nop -> call __bound_local_new */
o(0x00000013);
}
static void gen_bounds_epilog(void)
{
addr_t saved_ind;
addr_t *bounds_ptr;
Sym *sym_data;
Sym label = {0};
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);
label.type.t = VT_VOID | VT_STATIC;
/* generate bound local allocation */
if (offset_modified) {
saved_ind = ind;
ind = func_bound_ind;
put_extern_sym(&label, cur_text_section, ind, 0);
greloca(cur_text_section, sym_data, ind, R_RISCV_GOT_HI20, 0);
o(0x17 | (10 << 7)); // auipc a0, 0 %pcrel_hi(sym)+addend
greloca(cur_text_section, &label, ind, R_RISCV_PCREL_LO12_I, 0);
EI(0x03, 3, 10, 10, 0); // ld a0, 0(a0)
gen_bounds_call(TOK___bound_local_new);
ind = saved_ind;
label.c = 0; /* force new local ELF symbol */
}
/* generate bound check local freeing */
o(0xe02a1101); /* addi sp,sp,-32 sd a0,0(sp) */
o(0xa82ae42e); /* sd a1,8(sp) fsd fa0,16(sp) */
put_extern_sym(&label, cur_text_section, ind, 0);
greloca(cur_text_section, sym_data, ind, R_RISCV_GOT_HI20, 0);
o(0x17 | (10 << 7)); // auipc a0, 0 %pcrel_hi(sym)+addend
greloca(cur_text_section, &label, ind, R_RISCV_PCREL_LO12_I, 0);
EI(0x03, 3, 10, 10, 0); // ld a0, 0(a0)
gen_bounds_call(TOK___bound_local_delete);
o(0x65a26502); /* ld a0,0(sp) ld a1,8(sp) */
o(0x61052542); /* fld fa0,16(sp) addi sp,sp,32 */
}
#endif
static void reg_pass_rec(CType *type, int *rc, int *fieldofs, int ofs)
{
if ((type->t & VT_BTYPE) == VT_STRUCT) {
Sym *f;
if (type->ref->type.t == VT_UNION)
rc[0] = -1;
else for (f = type->ref->next; f; f = f->next)
reg_pass_rec(&f->type, rc, fieldofs, ofs + f->c);
} else if (type->t & VT_ARRAY) {
if (type->ref->c < 0 || type->ref->c > 2)
rc[0] = -1;
else {
int a, sz = type_size(&type->ref->type, &a);
reg_pass_rec(&type->ref->type, rc, fieldofs, ofs);
if (rc[0] > 2 || (rc[0] == 2 && type->ref->c > 1))
rc[0] = -1;
else if (type->ref->c == 2 && rc[0] && rc[1] == RC_FLOAT) {
rc[++rc[0]] = RC_FLOAT;
fieldofs[rc[0]] = ((ofs + sz) << 4)
| (type->ref->type.t & VT_BTYPE);
} else if (type->ref->c == 2)
rc[0] = -1;
}
} else if (rc[0] == 2 || rc[0] < 0 || (type->t & VT_BTYPE) == VT_LDOUBLE)
rc[0] = -1;
else if (!rc[0] || rc[1] == RC_FLOAT || is_float(type->t)) {
rc[++rc[0]] = is_float(type->t) ? RC_FLOAT : RC_INT;
fieldofs[rc[0]] = (ofs << 4) | ((type->t & VT_BTYPE) == VT_PTR ? VT_LLONG : type->t & VT_BTYPE);
} else
rc[0] = -1;
}
static void reg_pass(CType *type, int *prc, int *fieldofs, int named)
{
prc[0] = 0;
reg_pass_rec(type, prc, fieldofs, 0);
if (prc[0] <= 0 || !named) {
int align, size = type_size(type, &align);
prc[0] = (size + 7) >> 3;
prc[1] = prc[2] = RC_INT;
fieldofs[1] = (0 << 4) | (size <= 1 ? VT_BYTE : size <= 2 ? VT_SHORT : size <= 4 ? VT_INT : VT_LLONG);
fieldofs[2] = (8 << 4) | (size <= 9 ? VT_BYTE : size <= 10 ? VT_SHORT : size <= 12 ? VT_INT : VT_LLONG);
}
}
ST_FUNC void gfunc_call(int nb_args)
{
int i, align, size, areg[2];
int *info = tcc_malloc((nb_args + 1) * sizeof (int));
int stack_adj = 0, tempspace = 0, stack_add, ofs, splitofs = 0;
SValue *sv;
Sym *sa;
#ifdef CONFIG_TCC_BCHECK
int bc_save = tcc_state->do_bounds_check;
if (tcc_state->do_bounds_check)
gbound_args(nb_args);
#endif
areg[0] = 0; /* int arg regs */
areg[1] = 8; /* float arg regs */
sa = vtop[-nb_args].type.ref->next;
for (i = 0; i < nb_args; i++) {
int nregs, byref = 0, tempofs;
int prc[3], fieldofs[3];
sv = &vtop[1 + i - nb_args];
sv->type.t &= ~VT_ARRAY; // XXX this should be done in tccgen.c
size = type_size(&sv->type, &align);
if (size > 16) {
if (align < XLEN)
align = XLEN;
tempspace = (tempspace + align - 1) & -align;
tempofs = tempspace;
tempspace += size;
size = align = 8;
byref = 64 | (tempofs << 7);
}
reg_pass(&sv->type, prc, fieldofs, sa != 0);
if (!sa && align == 2*XLEN && size <= 2*XLEN)
areg[0] = (areg[0] + 1) & ~1;
nregs = prc[0];
if (size == 0)
info[i] = 0;
else if ((prc[1] == RC_INT && areg[0] >= 8)
|| (prc[1] == RC_FLOAT && areg[1] >= 16)
|| (nregs == 2 && prc[1] == RC_FLOAT && prc[2] == RC_FLOAT
&& areg[1] >= 15)
|| (nregs == 2 && prc[1] != prc[2]
&& (areg[1] >= 16 || areg[0] >= 8))) {
info[i] = 32;
if (align < XLEN)
align = XLEN;
stack_adj += (size + align - 1) & -align;
if (!sa) /* one vararg on stack forces the rest on stack */
areg[0] = 8, areg[1] = 16;
} else {
info[i] = areg[prc[1] - 1]++;
if (!byref)
info[i] |= (fieldofs[1] & VT_BTYPE) << 12;
assert(!(fieldofs[1] >> 4));
if (nregs == 2) {
if (prc[2] == RC_FLOAT || areg[0] < 8)
info[i] |= (1 + areg[prc[2] - 1]++) << 7;
else {
info[i] |= 16;
stack_adj += 8;
}
if (!byref) {
assert((fieldofs[2] >> 4) < 2048);
info[i] |= fieldofs[2] << (12 + 4); // includes offset
}
}
}
info[i] |= byref;
if (sa)
sa = sa->next;
}
stack_adj = (stack_adj + 15) & -16;
tempspace = (tempspace + 15) & -16;
stack_add = stack_adj + tempspace;
/* fetch cpu flag before generating any code */
if ((vtop->r & VT_VALMASK) == VT_CMP)
gv(RC_INT);
if (stack_add) {
if (stack_add >= 0x800) {
unsigned int bit11 = (((unsigned int)-stack_add) >> 11) & 1;
o(0x37 | (5 << 7) |
((-stack_add + (bit11 << 12)) & 0xfffff000)); //lui t0, upper(v)
EI(0x13, 0, 5, 5, ((-stack_add & 0xfff) - bit11 * (1 << 12)));
// addi t0, t0, lo(v)
ER(0x33, 0, 2, 2, 5, 0); // add sp, sp, t0
}
else
EI(0x13, 0, 2, 2, -stack_add); // addi sp, sp, -adj
for (i = ofs = 0; i < nb_args; i++) {
if (info[i] & (64 | 32)) {
vrotb(nb_args - i);
size = type_size(&vtop->type, &align);
if (info[i] & 64) {
vset(&char_pointer_type, TREG_SP, 0);
vpushi(stack_adj + (info[i] >> 7));
gen_op('+');
vpushv(vtop); // this replaces the old argument
vrott(3);
indir();
vtop->type = vtop[-1].type;
vswap();
vstore();
vpop();
size = align = 8;
}
if (info[i] & 32) {
if (align < XLEN)
align = XLEN;
/* Once we support offseted regs we can do this:
vset(&vtop->type, TREG_SP | VT_LVAL, ofs);
to construct the lvalue for the outgoing stack slot,
until then we have to jump through hoops. */
vset(&char_pointer_type, TREG_SP, 0);
ofs = (ofs + align - 1) & -align;
vpushi(ofs);
gen_op('+');
indir();
vtop->type = vtop[-1].type;
vswap();
vstore();
vtop->r = vtop->r2 = VT_CONST; // this arg is done
ofs += size;
}
vrott(nb_args - i);
} else if (info[i] & 16) {
assert(!splitofs);
splitofs = ofs;
ofs += 8;
}
}
}
for (i = 0; i < nb_args; i++) {
int ii = info[nb_args - 1 - i], r = ii, r2 = r;
if (!(r & 32)) {
CType origtype;
int loadt;
r &= 15;
r2 = r2 & 64 ? 0 : (r2 >> 7) & 31;
assert(r2 <= 16);
vrotb(i+1);
origtype = vtop->type;
size = type_size(&vtop->type, &align);
if (size == 0)
goto done;
loadt = vtop->type.t & VT_BTYPE;
if (loadt == VT_STRUCT) {
loadt = (ii >> 12) & VT_BTYPE;
}
if (info[nb_args - 1 - i] & 16) {
assert(!r2);
r2 = 1 + TREG_RA;
}
if (loadt == VT_LDOUBLE) {
assert(r2);
r2--;
} else if (r2) {
test_lvalue();
vpushv(vtop);
}
vtop->type.t = loadt | (vtop->type.t & VT_UNSIGNED);
gv(r < 8 ? RC_R(r) : RC_F(r - 8));
vtop->type = origtype;
if (r2 && loadt != VT_LDOUBLE) {
r2--;
assert(r2 < 16 || r2 == TREG_RA);
vswap();
gaddrof();
vtop->type = char_pointer_type;
vpushi(ii >> 20);
#ifdef CONFIG_TCC_BCHECK
if ((origtype.t & VT_BTYPE) == VT_STRUCT)
tcc_state->do_bounds_check = 0;
#endif
gen_op('+');
#ifdef CONFIG_TCC_BCHECK
tcc_state->do_bounds_check = bc_save;
#endif
indir();
vtop->type = origtype;
loadt = vtop->type.t & VT_BTYPE;
if (loadt == VT_STRUCT) {
loadt = (ii >> 16) & VT_BTYPE;
}
save_reg_upstack(r2, 1);
vtop->type.t = loadt | (vtop->type.t & VT_UNSIGNED);
load(r2, vtop);
assert(r2 < VT_CONST);
vtop--;
vtop->r2 = r2;
}
if (info[nb_args - 1 - i] & 16) {
ES(0x23, 3, 2, ireg(vtop->r2), splitofs); // sd t0, ofs(sp)
vtop->r2 = VT_CONST;
} else if (loadt == VT_LDOUBLE && vtop->r2 != r2) {
assert(vtop->r2 <= 7 && r2 <= 7);
/* XXX we'd like to have 'gv' move directly into
the right class instead of us fixing it up. */
EI(0x13, 0, ireg(r2), ireg(vtop->r2), 0); // mv Ra+1, RR2
vtop->r2 = r2;
}
done:
vrott(i+1);
}
}
vrotb(nb_args + 1);
save_regs(nb_args + 1);
gcall_or_jmp(1);
vtop -= nb_args + 1;
if (stack_add) {
if (stack_add >= 0x800) {
unsigned int bit11 = ((unsigned int)stack_add >> 11) & 1;
o(0x37 | (5 << 7) |
((stack_add + (bit11 << 12)) & 0xfffff000)); //lui t0, upper(v)
EI(0x13, 0, 5, 5, (stack_add & 0xfff) - bit11 * (1 << 12));
// addi t0, t0, lo(v)
ER(0x33, 0, 2, 2, 5, 0); // add sp, sp, t0
}
else
EI(0x13, 0, 2, 2, stack_add); // addi sp, sp, adj
}
tcc_free(info);
}
static int func_sub_sp_offset, num_va_regs, func_va_list_ofs;
ST_FUNC void gfunc_prolog(Sym *func_sym)
{
CType *func_type = &func_sym->type;
int i, addr, align, size;
int param_addr = 0;
int areg[2];
Sym *sym;
CType *type;
sym = func_type->ref;
loc = -16; // for ra and s0
func_sub_sp_offset = ind;
ind += 5 * 4;
areg[0] = 0, areg[1] = 0;
addr = 0;
/* if the function returns by reference, then add an
implicit pointer parameter */
size = type_size(&func_vt, &align);
if (size > 2 * XLEN) {
loc -= 8;
func_vc = loc;
ES(0x23, 3, 8, 10 + areg[0]++, loc); // sd a0, loc(s0)
}
/* define parameters */
while ((sym = sym->next) != NULL) {
int byref = 0;
int regcount;
int prc[3], fieldofs[3];
type = &sym->type;
size = type_size(type, &align);
if (size > 2 * XLEN) {
type = &char_pointer_type;
size = align = byref = 8;
}
reg_pass(type, prc, fieldofs, 1);
regcount = prc[0];
if (areg[prc[1] - 1] >= 8
|| (regcount == 2
&& ((prc[1] == RC_FLOAT && prc[2] == RC_FLOAT && areg[1] >= 7)
|| (prc[1] != prc[2] && (areg[1] >= 8 || areg[0] >= 8))))) {
if (align < XLEN)
align = XLEN;
addr = (addr + align - 1) & -align;
param_addr = addr;
addr += size;
} else {
loc -= regcount * 8; // XXX could reserve only 'size' bytes
param_addr = loc;
for (i = 0; i < regcount; i++) {
if (areg[prc[1+i] - 1] >= 8) {
assert(i == 1 && regcount == 2 && !(addr & 7));
EI(0x03, 3, 5, 8, addr); // ld t0, addr(s0)
addr += 8;
ES(0x23, 3, 8, 5, loc + i*8); // sd t0, loc(s0)
} else if (prc[1+i] == RC_FLOAT) {
ES(0x27, (size / regcount) == 4 ? 2 : 3, 8, 10 + areg[1]++, loc + (fieldofs[i+1] >> 4)); // fs[wd] FAi, loc(s0)
} else {
ES(0x23, 3, 8, 10 + areg[0]++, loc + i*8); // sd aX, loc(s0) // XXX
}
}
}
sym_push(sym->v & ~SYM_FIELD, &sym->type,
(byref ? VT_LLOCAL : VT_LOCAL) | VT_LVAL,
param_addr);
}
func_va_list_ofs = addr;
num_va_regs = 0;
if (func_var) {
for (; areg[0] < 8; areg[0]++) {
num_va_regs++;
ES(0x23, 3, 8, 10 + areg[0], -8 + num_va_regs * 8); // sd aX, loc(s0)
}
}
#ifdef CONFIG_TCC_BCHECK
if (tcc_state->do_bounds_check)
gen_bounds_prolog();
#endif
}
ST_FUNC int gfunc_sret(CType *vt, int variadic, CType *ret,
int *ret_align, int *regsize)
{
int align, size = type_size(vt, &align), nregs;
int prc[3], fieldofs[3];
*ret_align = 1;
*regsize = 8;
if (size > 16)
return 0;
reg_pass(vt, prc, fieldofs, 1);
nregs = prc[0];
if (nregs == 2 && prc[1] != prc[2])
return -1; /* generic code can't deal with this case */
if (prc[1] == RC_FLOAT) {
*regsize = size / nregs;
}
ret->t = fieldofs[1] & VT_BTYPE;
ret->ref = NULL;
return nregs;
}
ST_FUNC void arch_transfer_ret_regs(int aftercall)
{
int prc[3], fieldofs[3];
reg_pass(&vtop->type, prc, fieldofs, 1);
assert(prc[0] == 2 && prc[1] != prc[2] && !(fieldofs[1] >> 4));
assert(vtop->r == (VT_LOCAL | VT_LVAL));
vpushv(vtop);
vtop->type.t = fieldofs[1] & VT_BTYPE;
(aftercall ? store : load)(prc[1] == RC_INT ? REG_IRET : REG_FRET, vtop);
vtop->c.i += fieldofs[2] >> 4;
vtop->type.t = fieldofs[2] & VT_BTYPE;
(aftercall ? store : load)(prc[2] == RC_INT ? REG_IRET : REG_FRET, vtop);
vtop--;
}
ST_FUNC void gfunc_epilog(void)
{
int v, saved_ind, d, large_ofs_ind;
#ifdef CONFIG_TCC_BCHECK
if (tcc_state->do_bounds_check)
gen_bounds_epilog();
#endif
loc = (loc - num_va_regs * 8);
d = v = (-loc + 15) & -16;
if (v >= (1 << 11)) {
d = 16;
o(0x37 | (5 << 7) | ((0x800 + (v-16)) & 0xfffff000)); //lui t0, upper(v)
EI(0x13, 0, 5, 5, (v-16) << 20 >> 20); // addi t0, t0, lo(v)
ER(0x33, 0, 2, 2, 5, 0); // add sp, sp, t0
}
EI(0x03, 3, 1, 2, d - 8 - num_va_regs * 8); // ld ra, v-8(sp)
EI(0x03, 3, 8, 2, d - 16 - num_va_regs * 8); // ld s0, v-16(sp)
EI(0x13, 0, 2, 2, d); // addi sp, sp, v
EI(0x67, 0, 0, 1, 0); // jalr x0, 0(x1), aka ret
large_ofs_ind = ind;
if (v >= (1 << 11)) {
EI(0x13, 0, 8, 2, d - num_va_regs * 8); // addi s0, sp, d
o(0x37 | (5 << 7) | ((0x800 + (v-16)) & 0xfffff000)); //lui t0, upper(v)
EI(0x13, 0, 5, 5, (v-16) << 20 >> 20); // addi t0, t0, lo(v)
ER(0x33, 0, 2, 2, 5, 0x20); // sub sp, sp, t0
gjmp_addr(func_sub_sp_offset + 5*4);
}
saved_ind = ind;
ind = func_sub_sp_offset;
EI(0x13, 0, 2, 2, -d); // addi sp, sp, -d
ES(0x23, 3, 2, 1, d - 8 - num_va_regs * 8); // sd ra, d-8(sp)
ES(0x23, 3, 2, 8, d - 16 - num_va_regs * 8); // sd s0, d-16(sp)
if (v < (1 << 11))
EI(0x13, 0, 8, 2, d - num_va_regs * 8); // addi s0, sp, d
else
gjmp_addr(large_ofs_ind);
if ((ind - func_sub_sp_offset) != 5*4)
EI(0x13, 0, 0, 0, 0); // addi x0, x0, 0 == nop
ind = saved_ind;
}
ST_FUNC void gen_va_start(void)
{
vtop--;
vset(&char_pointer_type, VT_LOCAL, func_va_list_ofs);
}
ST_FUNC void gen_fill_nops(int bytes)
{
if ((bytes & 3))
tcc_error("alignment of code section not multiple of 4");
while (bytes > 0) {
EI(0x13, 0, 0, 0, 0); // addi x0, x0, 0 == nop
bytes -= 4;
}
}
// Generate forward branch to label:
ST_FUNC int gjmp(int t)
{
if (nocode_wanted)
return t;
o(t);
return ind - 4;
}
// Generate branch to known address:
ST_FUNC void gjmp_addr(int a)
{
uint32_t r = a - ind, imm;
if ((r + (1 << 21)) & ~((1U << 22) - 2)) {
o(0x17 | (5 << 7) | (((r + 0x800) & 0xfffff000))); // lui RR, up(r)
r = (int)r << 20 >> 20;
EI(0x67, 0, 0, 5, r); // jalr x0, r(t0)
} else {
imm = (((r >> 12) & 0xff) << 12)
| (((r >> 11) & 1) << 20)
| (((r >> 1) & 0x3ff) << 21)
| (((r >> 20) & 1) << 31);
o(0x6f | imm); // jal x0, imm == j imm
}
}
ST_FUNC int gjmp_cond(int op, int t)
{
int tmp;
int a = vtop->cmp_r & 0xff;
int b = (vtop->cmp_r >> 8) & 0xff;
switch (op) {
case TOK_ULT: op = 6; break;
case TOK_UGE: op = 7; break;
case TOK_ULE: op = 7; tmp = a; a = b; b = tmp; break;
case TOK_UGT: op = 6; tmp = a; a = b; b = tmp; break;
case TOK_LT: op = 4; break;
case TOK_GE: op = 5; break;
case TOK_LE: op = 5; tmp = a; a = b; b = tmp; break;
case TOK_GT: op = 4; tmp = a; a = b; b = tmp; break;
case TOK_NE: op = 1; break;
case TOK_EQ: op = 0; break;
}
o(0x63 | (op ^ 1) << 12 | a << 15 | b << 20 | 8 << 7); // bOP a,b,+4