pe32+ target: adjust x86_64-gen.c

- calling conventions are different:
  * only 4 registers
  * stack "scratch area" is always reserved
  * doubles are mirrored in normal registers
- no GOT or PIC there
This commit is contained in:
grischka 2009-07-18 22:05:49 +02:00
parent 3ba1532cfb
commit 459875796b

View File

@ -210,12 +210,21 @@ static void gen_addrpc32(int r, Sym *sym, int c)
/* output got address with relocation */
static void gen_gotpcrel(int r, Sym *sym, int c)
{
#ifndef TCC_TARGET_PE
Section *sr;
ElfW(Rela) *rel;
greloc(cur_text_section, sym, ind, R_X86_64_GOTPCREL);
sr = cur_text_section->reloc;
rel = (ElfW(Rela) *)(sr->data + sr->data_offset - sizeof(ElfW(Rela)));
rel->r_addend = -4;
#else
printf("picpic: %s %x %x | %02x %02x %02x\n", get_tok_str(sym->v, NULL), c, r,
cur_text_section->data[ind-3],
cur_text_section->data[ind-2],
cur_text_section->data[ind-1]
);
greloc(cur_text_section, sym, ind, R_X86_64_PC32);
#endif
gen_le32(0);
if (c) {
@ -293,6 +302,7 @@ void load(int r, SValue *sv)
ft = sv->type.t;
fc = sv->c.ul;
#ifndef TCC_TARGET_PE
/* we use indirect access via got */
if ((fr & VT_VALMASK) == VT_CONST && (fr & VT_SYM) &&
(fr & VT_LVAL) && !(sv->sym->type.t & VT_STATIC)) {
@ -307,6 +317,7 @@ void load(int r, SValue *sv)
/* load from the temporal register */
fr = tr | VT_LVAL;
}
#endif
v = fr & VT_VALMASK;
if (fr & VT_LVAL) {
@ -350,15 +361,19 @@ void load(int r, SValue *sv)
gen_addr64(fr, sv->sym, sv->c.ull);
} else {
if (fr & VT_SYM) {
#ifndef TCC_TARGET_PE
if (sv->sym->type.t & VT_STATIC) {
#endif
o(0x8d48);
o(0x05 + REG_VALUE(r) * 8); /* lea xx(%rip), r */
gen_addrpc32(fr, sv->sym, fc);
#ifndef TCC_TARGET_PE
} else {
o(0x8b48);
o(0x05 + REG_VALUE(r) * 8); /* mov xx(%rip), r */
gen_gotpcrel(r, sv->sym, fc);
}
#endif
} else {
o(0xb8 + REG_VALUE(r)); /* mov $xx, r */
gen_le32(fc);
@ -416,6 +431,7 @@ void store(int r, SValue *v)
fr = v->r & VT_VALMASK;
bt = ft & VT_BTYPE;
#ifndef TCC_TARGET_PE
/* we need to access the variable via got */
if (fr == VT_CONST && (v->r & VT_SYM)) {
/* mov xx(%rip), %r11 */
@ -423,6 +439,7 @@ void store(int r, SValue *v)
gen_gotpcrel(TREG_R11, v->sym, v->c.ul);
pic = is64_type(bt) ? 0x49 : 0x41;
}
#endif
/* XXX: incorrect if float reg to reg */
if (bt == VT_FLOAT) {
@ -515,16 +532,24 @@ static void gcall_or_jmp(int is_jmp)
}
}
static uint8_t arg_regs[6] = {
#ifdef TCC_TARGET_PE
#define REGN 4
static uint8_t arg_regs[] = {
TREG_RCX, TREG_RDX, TREG_R8, TREG_R9
};
#else
#define REGN 6
static uint8_t arg_regs[REGN] = {
TREG_RDI, TREG_RSI, TREG_RDX, TREG_RCX, TREG_R8, TREG_R9
};
#endif
/* Generate function call. The function address is pushed first, then
all the parameters in call order. This functions pops all the
parameters and the function address. */
void gfunc_call(int nb_args)
{
int size, align, r, args_size, i, func_call;
Sym *func_sym;
int size, align, r, args_size, i;
SValue *orig_vtop;
int nb_reg_args = 0;
int nb_sse_args = 0;
@ -537,12 +562,14 @@ void gfunc_call(int nb_args)
args_size += type_size(&vtop->type, &align);
} else if ((vtop[-i].type.t & VT_BTYPE) == VT_LDOUBLE) {
args_size += 16;
#ifndef TCC_TARGET_PE
} else if (is_sse_float(vtop[-i].type.t)) {
nb_sse_args++;
if (nb_sse_args > 8) args_size += 8;
#endif
} else {
nb_reg_args++;
if (nb_reg_args > 6) args_size += 8;
if (nb_reg_args > REGN) args_size += 8;
}
}
@ -552,6 +579,11 @@ void gfunc_call(int nb_args)
orig_vtop = vtop;
gen_reg = nb_reg_args;
sse_reg = nb_sse_args;
#ifdef TCC_TARGET_PE
save_regs(0); /* save used temporary registers */
#endif
/* adjust stack to align SSE boundary */
if (args_size &= 8) {
o(0x50); /* push $rax */
@ -587,8 +619,13 @@ void gfunc_call(int nb_args)
g(0x00);
args_size += size;
} else if (is_sse_float(vtop->type.t)) {
#ifdef TCC_TARGET_PE
int j = --gen_reg;
if (j >= REGN) {
#else
int j = --sse_reg;
if (j >= 8) {
#endif
gv(RC_FLOAT);
o(0x50); /* push $rax */
/* movq %xmm0, (%rsp) */
@ -600,7 +637,7 @@ void gfunc_call(int nb_args)
int j = --gen_reg;
/* simple type */
/* XXX: implicit cast ? */
if (j >= 6) {
if (j >= REGN) {
r = gv(RC_INT);
o(0x50 + r); /* push r */
args_size += 8;
@ -620,6 +657,42 @@ void gfunc_call(int nb_args)
if ((vtop->type.t & VT_BTYPE) == VT_STRUCT ||
(vtop->type.t & VT_BTYPE) == VT_LDOUBLE) {
} else if (is_sse_float(vtop->type.t)) {
#ifdef TCC_TARGET_PE
int j = --gen_reg;
if (j < REGN) {
int d = arg_regs[j];
gv(RC_FLOAT); /* only one float register */
/* movaps %xmm0, %xmmN */
o(0x280f);
o(0xc0 + (j << 3));
o(0x50);
o(0xd60f66); /* movq %xmm0, (%rsp) */
o(0x2404 + (j << 3));
if (d < 8) {
o(0x58 + d); /* pop d */
} else {
o(0x58);
o(0xc08949 + d - 8);
}
}
} else {
int j = --gen_reg;
/* simple type */
/* XXX: implicit cast ? */
if (j < REGN) {
int d = arg_regs[j];
r = gv(RC_INT);
if (d != r) {
if (d < 8) {
o(0x8948); /* mov */
o(0xc0 + r * 8 + d);
} else {
o(0x8949); /* mov */
o(0xc0 + r * 8 + d - 8);
}
}
}
#else
int j = --sse_reg;
if (j < 8) {
gv(RC_FLOAT); /* only one float register */
@ -631,7 +704,7 @@ void gfunc_call(int nb_args)
int j = --gen_reg;
/* simple type */
/* XXX: implicit cast ? */
if (j < 6) {
if (j < REGN) {
r = gv(RC_INT);
if (j < 2) {
o(0x8948); /* mov */
@ -646,10 +719,16 @@ void gfunc_call(int nb_args)
o(0xc0 + r * 8 + j - 4);
}
}
#endif
}
vtop--;
}
#ifdef TCC_TARGET_PE
/* allocate scratch space */
gadd_sp(-8*REGN);
args_size += 8*REGN;
#else
save_regs(0); /* save used temporary registers */
/* Copy R10 and R11 into RDX and RCX, respectively */
@ -660,22 +739,15 @@ void gfunc_call(int nb_args)
}
}
func_sym = vtop->type.ref;
func_call = FUNC_CALL(func_sym->r);
oad(0xb8, nb_sse_args < 8 ? nb_sse_args : 8); /* mov nb_sse_args, %eax */
#endif
gcall_or_jmp(0);
if (args_size)
gadd_sp(args_size);
vtop--;
}
#ifdef TCC_TARGET_PE
/* XXX: support PE? */
#warning "PE isn't tested at all"
#define FUNC_PROLOG_SIZE 12
#else
#define FUNC_PROLOG_SIZE 11
#endif
static void push_arg_reg(int i) {
loc -= 8;
@ -685,7 +757,7 @@ static void push_arg_reg(int i) {
/* generate function prolog of type 't' */
void gfunc_prolog(CType *func_type)
{
int i, addr, align, size, func_call;
int i, addr, align, size;
int param_index, param_addr, reg_param_index, sse_param_index;
Sym *sym;
CType *type;
@ -693,12 +765,12 @@ void gfunc_prolog(CType *func_type)
func_ret_sub = 0;
sym = func_type->ref;
func_call = FUNC_CALL(sym->r);
addr = PTR_SIZE * 2;
loc = 0;
ind += FUNC_PROLOG_SIZE;
func_sub_sp_offset = ind;
#ifndef TCC_TARGET_PE
if (func_type->ref->c == FUNC_ELLIPSIS) {
int seen_reg_num, seen_sse_num, seen_stack_size;
seen_reg_num = seen_sse_num = 0;
@ -721,7 +793,7 @@ void gfunc_prolog(CType *func_type)
} else if ((type->t & VT_BTYPE) == VT_LDOUBLE) {
seen_stack_size += LDOUBLE_SIZE;
} else {
if (seen_reg_num < 6) {
if (seen_reg_num < REGN) {
seen_reg_num++;
} else {
seen_stack_size += 8;
@ -750,10 +822,11 @@ void gfunc_prolog(CType *func_type)
gen_le32(loc + 8);
gen_le32(0);
}
for (i = 0; i < 6; i++) {
push_arg_reg(5 - i);
for (i = 0; i < REGN; i++) {
push_arg_reg(REGN-1-i);
}
}
#endif
sym = func_type->ref;
param_index = 0;
@ -776,6 +849,7 @@ void gfunc_prolog(CType *func_type)
type = &sym->type;
size = type_size(type, &align);
size = (size + 3) & ~3;
#ifndef TCC_TARGET_PE
if (is_sse_float(type->t)) {
if (sse_param_index < 8) {
/* save arguments passed by register */
@ -788,12 +862,22 @@ void gfunc_prolog(CType *func_type)
addr += size;
}
sse_param_index++;
} else if ((type->t & VT_BTYPE) == VT_STRUCT ||
} else
#endif
if ((type->t & VT_BTYPE) == VT_STRUCT ||
(type->t & VT_BTYPE) == VT_LDOUBLE) {
param_addr = addr;
addr += size;
} else {
if (reg_param_index < 6) {
#ifdef TCC_TARGET_PE
if (reg_param_index < REGN) {
/* save arguments passed by register */
gen_modrm64(0x89, arg_regs[reg_param_index], VT_LOCAL, NULL, addr);
}
param_addr = addr;
addr += 8;
#else
if (reg_param_index < REGN) {
/* save arguments passed by register */
push_arg_reg(reg_param_index);
param_addr = loc;
@ -801,12 +885,21 @@ void gfunc_prolog(CType *func_type)
param_addr = addr;
addr += 8;
}
#endif
reg_param_index++;
}
sym_push(sym->v & ~SYM_FIELD, type,
VT_LOCAL | VT_LVAL, param_addr);
param_index++;
}
#ifdef TCC_TARGET_PE
if (func_type->ref->c == FUNC_ELLIPSIS) {
for (i = reg_param_index; i < REGN; ++i) {
gen_modrm64(0x89, arg_regs[i], VT_LOCAL, NULL, addr);
addr += 8;
}
}
#endif
}
/* generate function epilog */
@ -826,7 +919,7 @@ void gfunc_epilog(void)
v = (-loc + 15) & -16;
saved_ind = ind;
ind = func_sub_sp_offset - FUNC_PROLOG_SIZE;
#ifdef TCC_TARGET_PE
#if 0 // def TCC_TARGET_PE - don't have __chkstk yet, because assembler does not work
if (v >= 4096) {
Sym *sym = external_global_sym(TOK___chkstk, &func_old_type, 0);
oad(0xb8, v); /* mov stacksize, %eax */
@ -838,9 +931,6 @@ void gfunc_epilog(void)
o(0xe5894855); /* push %rbp, mov %rsp, %rbp */
o(0xec8148); /* sub rsp, stacksize */
gen_le32(v);
#if FUNC_PROLOG_SIZE == 12
o(0x90); /* adjust to FUNC_PROLOG_SIZE */
#endif
}
ind = saved_ind;
}