#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 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_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 #else #include "tcc.h" #include #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 }; 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) { static Sym label; int rr, doload = 0; int fc = sv->c.i, v = sv->r & VT_VALMASK; if (sv->r & VT_SYM) { 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%llx)", sv->c.i); greloca(cur_text_section, sv->sym, ind, R_RISCV_GOT_HI20, 0); doload = 1; } if (!label.v) { label.v = tok_alloc(".L0 ", 4)->tok; label.type.t = VT_VOID | VT_STATIC; } label.c = 0; /* force new local ELF symbol */ 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%llx)", (long 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; } 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 = type_size(&sv->type, &align); if (fr & VT_LVAL) { int func3, opcode = is_freg(r) ? 0x07 : 0x03, br; 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 { 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; uint32_t pi; si >>= 32; if (si != 0) { pi = si; 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 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; 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 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) } } 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); } 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[nb_args ? nb_args : 1]; int stack_adj = 0, tempspace = 0, ofs, splitofs = 0; SValue *sv; Sym *sa; 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 ((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; if (stack_adj + tempspace) { EI(0x13, 0, 2, 2, -(stack_adj + tempspace)); // 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); 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; 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); gen_op('+'); 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; 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; } vrott(i+1); } } vrotb(nb_args + 1); save_regs(nb_args + 1); gcall_or_jmp(1); vtop -= nb_args + 1; if (stack_adj + tempspace) EI(0x13, 0, 2, 2, stack_adj + tempspace); // addi sp, sp, adj } static int func_sub_sp_offset, num_va_regs, func_va_list_ofs; ST_FUNC void gfunc_prolog(CType *func_type) { int i, addr, align, size; int param_addr = 0; int areg[2]; Sym *sym; CType *type; sym = func_type->ref; func_vt = sym->type; 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) | lvalue_type(sym->type.t), param_addr); } func_va_list_ofs = addr; num_va_regs = 0; if (func_type->ref->f.func_type == FUNC_ELLIPSIS) { 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) } } } 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; 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; 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 if (v >= (1 << 11)) { large_ofs_ind = ind; 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 return gjmp(t); } ST_FUNC int gjmp_append(int n, int t) { void *p; /* insert jump list n into 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; } static void gen_opil(int op, int ll) { int a, b, d; int func3 = 0; ll = ll ? 0 : 8; if ((vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST) { int fc = vtop->c.i; if (fc == vtop->c.i && !(((unsigned)fc + (1 << 11)) >> 12)) { int cll = 0; vswap(); gv(RC_INT); a = ireg(vtop[0].r); --vtop; d = get_reg(RC_INT); ++vtop; vswap(); switch (op) { case '-': if (fc <= -(1 << 11)) break; fc = -fc; case '+': func3 = 0; // addi d, a, fc do_cop: EI(0x13 | cll, func3, ireg(d), a, fc); --vtop; if (op >= TOK_ULT && op <= TOK_GT) { vset_VT_CMP(TOK_NE); vtop->cmp_r = ireg(d) | 0 << 8; } else vtop[0].r = d; return; case TOK_LE: if (fc >= (1 << 11) - 1) break; ++fc; case TOK_LT: func3 = 2; goto do_cop; // slti d, a, fc case TOK_ULE: if (fc >= (1 << 11) - 1) break; ++fc; case TOK_ULT: func3 = 3; goto do_cop; // sltiu d, a, fc case '^': func3 = 4; goto do_cop; // xori d, a, fc case '|': func3 = 6; goto do_cop; // ori d, a, fc case '&': func3 = 7; goto do_cop; // andi d, a, fc case TOK_SHL: func3 = 1; fc &= 63; goto do_cop; // slli d, a, fc case TOK_SHR: func3 = 5; cll = ll; fc &= 63; goto do_cop; // srli d, a, fc case TOK_SAR: func3 = 5; cll = ll; fc = 1024 | (fc & 63); goto do_cop; case TOK_UGE: case TOK_UGT: case TOK_GE: case TOK_GT: gen_opil(op - 1, ll); vtop->cmp_op ^= 1; return; case TOK_NE: case TOK_EQ: if (fc) gen_opil('-', ll), a = ireg(vtop++->r); --vtop; vset_VT_CMP(op); vtop->cmp_r = a | 0 << 8; return; } } } gv2(RC_INT, RC_INT); a = ireg(vtop[-1].r); b = ireg(vtop[0].r); vtop -= 2; d = get_reg(RC_INT); vtop++; vtop[0].r = d; d = ireg(d); switch (op) { default: if (op >= TOK_ULT && op <= TOK_GT) { vset_VT_CMP(op); vtop->cmp_r = a | b << 8; break; } tcc_error("implement me: %s(%s)", __FUNCTION__, get_tok_str(op, NULL)); break; case '+': ER(0x33, 0, d, a, b, 0); // add d, a, b break; case '-': ER(0x33, 0, d, a, b, 0x20); // sub d, a, b break; case TOK_SAR: ER(0x33 | ll, 5, d, a, b, 0x20); // sra d, a, b break; case TOK_SHR: ER(0x33 | ll, 5, d, a, b, 0); // srl d, a, b break; case TOK_SHL: ER(0x33, 1, d, a, b, 0); // sll d, a, b break; case '*': ER(0x33, 0, d, a, b, 1); // mul d, a, b break; case '/': ER(0x33, 4, d, a, b, 1); // div d, a, b break; case '&': ER(0x33, 7, d, a, b, 0); // and d, a, b break; case '^': ER(0x33, 4, d, a, b, 0); // xor d, a, b break; case '|': ER(0x33, 6, d, a, b, 0); // or d, a, b break; case '%': ER(0x33, 6, d, a, b, 1); // rem d, a, b break; case TOK_UMOD: ER(0x33, 7, d, a, b, 1); // remu d, a, b break; case TOK_PDIV: case TOK_UDIV: ER(0x33, 5, d, a, b, 1); // divu d, a, b break; } } ST_FUNC void gen_opi(int op) { gen_opil(op, 0); } ST_FUNC void gen_opl(int op) { gen_opil(op, 1); } ST_FUNC void gen_opf(int op) { int rs1, rs2, rd, dbl, invert; 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 = REG_IRET; vtop->r2 = cond < 0 ? TREG_R(1) : VT_CONST; if (cond < 0) vtop->type = type; else { vpushi(0); gen_opil(op, 1); } return; } gv2(RC_FLOAT, RC_FLOAT); assert(vtop->type.t == VT_DOUBLE || vtop->type.t == VT_FLOAT); dbl = vtop->type.t == VT_DOUBLE; rs1 = freg(vtop[-1].r); rs2 = freg(vtop->r); vtop--; invert = 0; switch(op) { default: assert(0); case '+': op = 0; // fadd arithop: rd = get_reg(RC_FLOAT); vtop->r = rd; rd = freg(rd); ER(0x53, 7, rd, rs1, rs2, dbl | (op << 2)); // fop.[sd] RD, RS1, RS2 (dyn rm) break; case '-': op = 1; // fsub goto arithop; case '*': op = 2; // fmul goto arithop; case '/': op = 3; // fdiv goto arithop; case TOK_EQ: op = 2; // EQ cmpop: rd = get_reg(RC_INT); vtop->r = rd; rd = ireg(rd); ER(0x53, op, rd, rs1, rs2, dbl | 0x50); // fcmp.[sd] RD, RS1, RS2 (op == eq/lt/le) if (invert) EI(0x13, 4, rd, rd, 1); // xori RD, 1 break; case TOK_NE: invert = 1; op = 2; // EQ goto cmpop; case TOK_LT: op = 1; // LT goto cmpop; case TOK_LE: op = 0; // LE goto cmpop; case TOK_GT: op = 1; // LT rd = rs1, rs1 = rs2, rs2 = rd; goto cmpop; case TOK_GE: op = 0; // LE rd = rs1, rs1 = rs2, rs2 = rd; goto cmpop; } } ST_FUNC void gen_cvt_sxtw(void) { /* XXX on risc-v the registers are usually sign-extended already. Let's try to not do anything here. */ } ST_FUNC void gen_cvt_itof(int t) { int rr = ireg(gv(RC_INT)), dr; int u = vtop->type.t & VT_UNSIGNED; int l = (vtop->type.t & VT_BTYPE) == VT_LLONG; if (t == VT_LDOUBLE) { int func = l ? (u ? TOK___floatunditf : TOK___floatditf) : (u ? 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_IRET; vtop->r2 = TREG_R(1); } else { vtop--; dr = get_reg(RC_FLOAT); vtop++; vtop->r = dr; dr = freg(dr); EIu(0x53, 7, dr, rr, ((0x68 | (t == VT_DOUBLE ? 1 : 0)) << 5) | (u ? 1 : 0) | (l ? 2 : 0)); // fcvt.[sd].[wl][u] } } ST_FUNC void gen_cvt_ftoi(int t) { int ft = vtop->type.t & VT_BTYPE; int l = (t & VT_BTYPE) == VT_LLONG; int u = t & VT_UNSIGNED; if (ft == VT_LDOUBLE) { int func = l ? (u ? TOK___fixunstfdi : TOK___fixtfdi) : (u ? 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; } else { int rr = freg(gv(RC_FLOAT)), dr; vtop--; dr = get_reg(RC_INT); vtop++; vtop->r = dr; dr = ireg(dr); EIu(0x53, 1, dr, rr, ((0x60 | (ft == VT_DOUBLE ? 1 : 0)) << 5) | (u ? 1 : 0) | (l ? 2 : 0)); // fcvt.[wl][u].[sd] rtz } } ST_FUNC void gen_cvt_ftof(int dt) { int st = vtop->type.t & VT_BTYPE, rs, rd; dt &= VT_BTYPE; if (st == dt) return; if (dt == VT_LDOUBLE || st == VT_LDOUBLE) { int func = (dt == VT_LDOUBLE) ? (st == VT_FLOAT ? TOK___extendsftf2 : TOK___extenddftf2) : (dt == VT_FLOAT ? TOK___trunctfsf2 : TOK___trunctfdf2); /* We can't use gfunc_call, as func_old_type works like vararg functions, and on riscv unnamed float args are passed like integers. But we really need them in the float argument registers for extendsftf2/extenddftf2. So, do it explicitely. */ save_regs(1); if (dt == VT_LDOUBLE) gv(RC_F(0)); else { gv(RC_R(0)); assert(vtop->r2 < 7); if (vtop->r2 != 1 + vtop->r) { EI(0x13, 0, ireg(vtop->r) + 1, ireg(vtop->r2), 0); // mv Ra+1, RR2 vtop->r2 = 1 + vtop->r; } } vpush_global_sym(&func_old_type, func); gcall_or_jmp(1); vtop -= 2; vpushi(0); vtop->type.t = dt; if (dt == VT_LDOUBLE) vtop->r = REG_IRET, vtop->r2 = REG_IRET+1; else vtop->r = REG_FRET; } else { assert (dt == VT_FLOAT || dt == VT_DOUBLE); assert (st == VT_FLOAT || st == VT_DOUBLE); rs = gv(RC_FLOAT); rd = get_reg(RC_FLOAT); if (dt == VT_DOUBLE) EI(0x53, 7, freg(rd), freg(rs), 0x21 << 5); // fcvt.d.s RD, RS (dyn rm) else EI(0x53, 7, freg(rd), freg(rs), (0x20 << 5) | 1); // fcvt.s.d RD, RS vtop->r = rd; } } ST_FUNC void ggoto(void) { gcall_or_jmp(0); vtop--; } ST_FUNC void gen_vla_sp_save(int addr) { ES(0x23, 3, 8, 2, addr); // sd sp, fc(s0) } ST_FUNC void gen_vla_sp_restore(int addr) { EI(0x03, 3, 2, 8, addr); // ld sp, fc(s0) } ST_FUNC void gen_vla_alloc(CType *type, int align) { int rr = ireg(gv(RC_INT)); EI(0x13, 0, rr, rr, 15); // addi RR, RR, 15 EI(0x13, 7, rr, rr, -16); // andi, RR, RR, -16 ER(0x33, 0, 2, 2, rr, 0x20); // sub sp, sp, rr vpop(); } #endif