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win64: add tiny unwind data for setjmp/longjmp

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This enables native unwind semantics with longjmp on
win64 by putting an entry into the .pdata section for
each compiled fuction.

Also, the function now use a fixed stack and store arguments
into X(%rsp) rather than using push.
This commit is contained in:
grischka
2009-12-19 22:40:28 +01:00
parent 88a3ccab9f
commit 50b040ef83
7 changed files with 322 additions and 110 deletions
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336
x86_64-gen.c
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@ -527,16 +527,6 @@ void store(int r, SValue *v)
}
}
static void gadd_sp(int val)
{
if (val == (char)val) {
o(0xc48348);
g(val);
} else {
oad(0xc48148, val); /* add $xxx, %rsp */
}
}
/* 'is_jmp' is '1' if it is a jump */
static void gcall_or_jmp(int is_jmp)
{
@ -564,16 +554,238 @@ static void gcall_or_jmp(int is_jmp)
}
#ifdef TCC_TARGET_PE
#define REGN 4
static const uint8_t arg_regs[] = {
TREG_RCX, TREG_RDX, TREG_R8, TREG_R9
};
static int func_scratch;
/* 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 gen_offs_sp(int b, int r, int d)
{
if (d == (char)d) {
o(b | 0x4000 | (r << 11));
g(d);
} else {
o(b | 0x8000 | (r << 11));
gen_le32(d);
}
}
void gfunc_call(int nb_args)
{
int size, align, r, args_size, i, d, j, bt;
int nb_reg_args, gen_reg;
/* calculate the number of integer/float arguments */
nb_reg_args = 0;
for(i = 0; i < nb_args; i++) {
bt = (vtop[-i].type.t & VT_BTYPE);
if (bt != VT_STRUCT && bt != VT_LDOUBLE)
nb_reg_args++;
}
args_size = (nb_reg_args < REGN ? REGN : nb_reg_args) * PTR_SIZE;
save_regs(0); /* save used temporary registers */
/* for struct arguments, we need to call memcpy and the function
call breaks register passing arguments we are preparing.
So, we process arguments which will be passed by stack first. */
for(i = 0; i < nb_args; i++) {
SValue *sv = &vtop[-i];
bt = (sv->type.t & VT_BTYPE);
if (bt == VT_STRUCT) {
size = type_size(&sv->type, &align);
/* align to stack align size */
size = (size + 15) & ~16;
/* generate structure store */
r = get_reg(RC_INT);
o(0x48);
gen_offs_sp(0x24048d, r, args_size);
args_size += size;
/* generate memcpy call */
vset(&sv->type, r | VT_LVAL, 0);
*++vtop = *sv;
vstore();
--vtop;
} else if (bt == VT_LDOUBLE) {
gv(RC_ST0);
gen_offs_sp(0x243cdb, 0, args_size);
args_size += 16;
}
}
if (func_scratch < args_size)
func_scratch = args_size;
gen_reg = nb_reg_args;
for(i = 0; i < nb_args; i++) {
bt = (vtop->type.t & VT_BTYPE);
if (bt == VT_STRUCT || bt == VT_LDOUBLE) {
; /* done */
} else if (is_sse_float(vtop->type.t)) {
gv(RC_FLOAT); /* only one float register */
j = --gen_reg;
if (j >= REGN) {
o(0x0f66),
/* movq %xmm0, j*8(%rsp) */
gen_offs_sp(0x2444d6, 0, j*8);
} else {
d = arg_regs[j];
/* movaps %xmm0, %xmmN */
o(0x280f);
o(0xc0 + (j << 3));
/* mov %xmm0, %rxx */
o(0x66);
o(0x7e0f48 + (d >= 8));
o(0xc0 + (d & 7));
}
} else {
r = gv(RC_INT);
j = --gen_reg;
if (j >= REGN) {
o(0x48);
gen_offs_sp(0x244489, r, j*8);
} else {
d = arg_regs[j];
if (d != r) {
o(0x8948 + (d >= 8));
o(0xc0 + r*8 + (d & 7));
}
}
}
vtop--;
}
gcall_or_jmp(0);
vtop--;
}
#define FUNC_PROLOG_SIZE 11
/* generate function prolog of type 't' */
void gfunc_prolog(CType *func_type)
{
int addr, align, size, reg_param_index, bt;
Sym *sym;
CType *type;
func_ret_sub = 0;
func_scratch = 0;
loc = 0;
addr = PTR_SIZE * 2;
ind += FUNC_PROLOG_SIZE;
func_sub_sp_offset = ind;
reg_param_index = 0;
sym = func_type->ref;
/* if the function returns a structure, then add an
implicit pointer parameter */
func_vt = sym->type;
if ((func_vt.t & VT_BTYPE) == VT_STRUCT) {
gen_modrm64(0x89, arg_regs[reg_param_index], VT_LOCAL, NULL, addr);
reg_param_index++;
addr += PTR_SIZE;
}
/* define parameters */
while ((sym = sym->next) != NULL) {
type = &sym->type;
bt = type->t & VT_BTYPE;
if (bt == VT_STRUCT || bt == VT_LDOUBLE)
continue;
if (reg_param_index < REGN) {
/* save arguments passed by register */
gen_modrm64(0x89, arg_regs[reg_param_index], VT_LOCAL, NULL, addr);
}
sym_push(sym->v & ~SYM_FIELD, type, VT_LOCAL | VT_LVAL, addr);
reg_param_index++;
addr += PTR_SIZE;
}
while (reg_param_index < REGN) {
if (func_type->ref->c == FUNC_ELLIPSIS)
gen_modrm64(0x89, arg_regs[reg_param_index], VT_LOCAL, NULL, addr);
reg_param_index++;
addr += PTR_SIZE;
}
sym = func_type->ref;
while ((sym = sym->next) != NULL) {
type = &sym->type;
bt = type->t & VT_BTYPE;
if (bt == VT_STRUCT || bt == VT_LDOUBLE) {
size = type_size(type, &align);
size = (size + 15) & -16;
sym_push(sym->v & ~SYM_FIELD, type, VT_LOCAL | VT_LVAL, addr);
addr += size;
}
}
}
/* generate function epilog */
void gfunc_epilog(void)
{
int v, saved_ind;
o(0xc9); /* leave */
if (func_ret_sub == 0) {
o(0xc3); /* ret */
} else {
o(0xc2); /* ret n */
g(func_ret_sub);
g(func_ret_sub >> 8);
}
saved_ind = ind;
ind = func_sub_sp_offset - FUNC_PROLOG_SIZE;
/* align local size to word & save local variables */
v = (func_scratch + -loc + 15) & -16;
pe_add_unwind_data(ind, saved_ind, v);
if (v >= 4096) {
Sym *sym = external_global_sym(TOK___chkstk, &func_old_type, 0);
oad(0xb8, v); /* mov stacksize, %eax */
oad(0xe8, -4); /* call __chkstk, (does the stackframe too) */
greloc(cur_text_section, sym, ind-4, R_X86_64_PC32);
o(0x90); /* fill for FUNC_PROLOG_SIZE = 11 bytes */
} else {
o(0xe5894855); /* push %rbp, mov %rsp, %rbp */
o(0xec8148); /* sub rsp, stacksize */
gen_le32(v);
}
ind = saved_ind;
}
#else
static void gadd_sp(int val)
{
if (val == (char)val) {
o(0xc48348);
g(val);
} else {
oad(0xc48148, val); /* add $xxx, %rsp */
}
}
#define REGN 6
static const 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
@ -593,11 +805,9 @@ 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 > REGN) args_size += 8;
@ -611,10 +821,6 @@ void gfunc_call(int nb_args)
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 */
@ -650,13 +856,8 @@ 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) */
@ -688,42 +889,6 @@ 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 */
@ -750,16 +915,10 @@ 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 */
@ -771,13 +930,13 @@ void gfunc_call(int nb_args)
}
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--;
}
#define FUNC_PROLOG_SIZE 11
static void push_arg_reg(int i) {
@ -793,15 +952,13 @@ void gfunc_prolog(CType *func_type)
Sym *sym;
CType *type;
func_ret_sub = 0;
sym = func_type->ref;
addr = PTR_SIZE * 2;
loc = 0;
ind += FUNC_PROLOG_SIZE;
func_sub_sp_offset = ind;
func_ret_sub = 0;
#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;
@ -857,7 +1014,6 @@ void gfunc_prolog(CType *func_type)
push_arg_reg(REGN-1-i);
}
}
#endif
sym = func_type->ref;
param_index = 0;
@ -880,7 +1036,6 @@ 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 */
@ -893,21 +1048,12 @@ void gfunc_prolog(CType *func_type)
addr += size;
}
sse_param_index++;
} else
#endif
if ((type->t & VT_BTYPE) == VT_STRUCT ||
} else if ((type->t & VT_BTYPE) == VT_STRUCT ||
(type->t & VT_BTYPE) == VT_LDOUBLE) {
param_addr = addr;
addr += size;
} else {
#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);
@ -916,21 +1062,12 @@ 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 */
@ -950,23 +1087,14 @@ void gfunc_epilog(void)
v = (-loc + 15) & -16;
saved_ind = ind;
ind = func_sub_sp_offset - FUNC_PROLOG_SIZE;
#ifdef TCC_TARGET_PE
if (v >= 4096) {
Sym *sym = external_global_sym(TOK___chkstk, &func_old_type, 0);
oad(0xb8, v); /* mov stacksize, %eax */
oad(0xe8, -4); /* call __chkstk, (does the stackframe too) */
greloc(cur_text_section, sym, ind-4, R_X86_64_PC32);
o(0x90); /* fill for FUNC_PROLOG_SIZE = 11 bytes */
} else
#endif
{
o(0xe5894855); /* push %rbp, mov %rsp, %rbp */
o(0xec8148); /* sub rsp, stacksize */
gen_le32(v);
}
o(0xe5894855); /* push %rbp, mov %rsp, %rbp */
o(0xec8148); /* sub rsp, stacksize */
gen_le32(v);
ind = saved_ind;
}
#endif /* not PE */
/* generate a jump to a label */
int gjmp(int t)
{