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binutils-gdb/gas/config/obj-coff-seh.c

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/* seh pdata/xdata coff object file format
Copyright 2009
Free Software Foundation, Inc.
This file is part of GAS.
GAS is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GAS is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GAS; see the file COPYING. If not, write to the Free
Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
02110-1301, USA. */
#include "obj-coff-seh.h"
/* Forward declarations. */
static seh_kind seh_get_target_kind (void);
static int seh_symbol (bfd *, const char *, const char *, const char *, asection *, int, int);
static void seh_reloc (bfd *, bfd_size_type, int, int);
static void save_relocs (asection *sec);
static asection *quick_section (bfd *abfd, const char *name, int flags, int align);
static void seh_symbol_init (bfd *abfd, unsigned int added);
static void seh_emit_rva (const char *);
static void seh_emit_long (const char *);
static void seh_make_globl (char *);
static segT seh_make_section (void);
static segT seh_make_section2 (const char *section_name, unsigned flags);
static char *seh_make_xlbl_name (seh_context *);
static char *make_seh_text_label (seh_context *c, symbolS **addr);
static void seh_write_text_eh_data (const char *hnd, const char *hnd_data);
static void seh_emit_rva (const char *name);
static int seh_needed_unwind_info (seh_context *);
static void seh_fill_pcsyms (const seh_context *c, char **, int *);
static size_t seh_getelm_data_size (const seh_context *, int, int, size_t *);
static void seh_store_elm_data (const seh_context *, int, int, unsigned char *, valueT base_off);
static size_t seh_getsize_of_unwind_entry (seh_context *, int, int, int);
static void seh_make_unwind_entry (const seh_context *, char *, int, int, int, unsigned char *, size_t *, int);
static size_t seh_getsize_unwind_data (seh_context *);
static void seh_create_unwind_data (seh_context *, unsigned char *, size_t);
static void seh_make_function_entry_xdata (seh_context *, char *, char *, char *, unsigned char *, size_t *,int);
static seh_scope_elem *seh_x64_makescope_elem (seh_context *, const char *, const char *, const char *, const char *);
/* Local data. */
static asymbol **symtab;
static int symptr;
static arelent *reltab = 0;
static int relcount = 0, relsize = 0;
static seh_context *seh_ctx_root = NULL;
static seh_context *seh_ctx = NULL;
static seh_context *seh_ctx_cur = NULL;
/* Write xdata for arm, sh3, sh4, and ppc. */
static void
seh_write_text_eh_data (const char *hnd, const char *hnd_data)
{
if (!hnd || *hnd==0)
return;
if (hnd[0] == '@')
seh_emit_long ("0");
else
seh_emit_long (hnd);
if (!hnd_data || hnd_data[0] == '@')
seh_emit_long ("0");
else
seh_emit_long (hnd_data);
}
/* Generate initial pdata for x64 and mips. */
static void
make_function_entry_pdata (seh_context *c)
{
segT sec = NULL;
segT current_seg = now_seg;
subsegT current_subseg = now_subseg;
sec = seh_make_section ();
switch (seh_get_target_kind ())
{
case seh_kind_x64:
subseg_set (sec, 0);
seh_emit_rva (c->func_name);
seh_emit_rva (c->end_symbol);
seh_emit_rva (c->xdata_first);
break;
case seh_kind_mips:
subseg_set (sec, 0);
seh_emit_long (c->func_name);
seh_emit_long (c->end_symbol);
if (c->handler_name == NULL)
seh_emit_long ("0");
else if (c->handler_name[0] == '@')
{
if (strcasecmp (c->handler_name, "@1") == 0)
seh_emit_long ("1");
else
seh_emit_long ("0");
}
else
seh_emit_long (c->handler_name);
if (c->handler_data_name == NULL || c->handler_data_name[0] == '@')
seh_emit_long ("0");
else
seh_emit_long (c->handler_data_name);
seh_emit_long (c->endprologue_symbol ? c->endprologue_symbol : c->func_name);
break;
default:
break;
}
subseg_set (current_seg, current_subseg);
}
/* Create and write xdata section. */
static void
seh_x64_write_xdata (void)
{
seh_context *h;
size_t xdata_size = 0, count_syms = 0;
size_t xdata_offs = 0;
unsigned char *data;
segT seg_xdata;
bfd *abfd = stdoutput;
h = seh_ctx_root;
if (!h || h->done)
return;
while (h != NULL)
{
h->xdata_offset = xdata_size;
xdata_size += seh_getsize_unwind_data (h);
count_syms += h->count_syms;
h = h->next;
}
if (xdata_size == 0)
return;
seh_symbol_init (abfd, count_syms);
data = xmalloc (xdata_size);
seg_xdata = quick_section (abfd, ".xdata", SEC_HAS_CONTENTS, 3);
seg_xdata->contents = data;
memset (data, 0, xdata_size);
bfd_set_section_size (abfd, seg_xdata, xdata_size);
h = seh_ctx_root;
while (h != NULL)
{
xdata_offs = h->xdata_offset;
h->section = seg_xdata;
h->abfd = abfd;
if (h->done == 0)
{
h->done = 1;
seh_create_unwind_data (h, data, xdata_offs);
h->done = 1;
}
h = h->next;
}
save_relocs (seg_xdata);
bfd_set_symtab (abfd, symtab, symptr);
bfd_set_section_contents (abfd, seg_xdata, data, 0, xdata_size);
}
/* Create pdata section data for arm. */
static void
seh_arm_create_pdata (seh_context *c, unsigned char *data, size_t pdata_offs)
{
int idx;
unsigned int val;
valueT func_len = 0;
valueT prolog_len = 0;
valueT start_len = 0;
func_len = resolve_symbol_value (c->end_addr);
start_len = resolve_symbol_value (c->start_addr);
if (c->endprologue_addr)
prolog_len = resolve_symbol_value (c->endprologue_addr);
else
prolog_len = start_len;
func_len -= start_len;
prolog_len -= start_len;
if (!c || !data)
return;
/* $$$$ */
idx = seh_symbol (c->abfd, c->start_symbol, "", "", UNDSEC, BSF_GLOBAL, 0);
seh_reloc (c->abfd, pdata_offs, BFD_RELOC_32, idx);
val = (unsigned int) func_len;
val <<= 8;
val |= ((unsigned int) prolog_len & 0xffU);
if (c->use_instruction_32)
val |= 0x40000000U;
if (c->handler_written)
val |= 0x80000000U;
bfd_put_32 (c->abfd, (bfd_vma) val, data + pdata_offs + 4);
}
/* Write pdata section for arm. */
static void
seh_arm_write_pdata (void)
{
seh_context *h;
size_t pdata_size = 0, count_syms = 0;
size_t pdata_offs = 0;
unsigned char *data;
segT seg_pdata;
bfd *abfd = stdoutput;
h = seh_ctx_root;
if (h == NULL || h->done)
return;
while (h != NULL)
{
h->xdata_offset = pdata_size;
pdata_size += 8;
count_syms += 1;
h = h->next;
}
if (pdata_size == 0)
return;
seh_symbol_init (abfd, count_syms);
data = xmalloc (pdata_size);
seg_pdata = quick_section (abfd, ".pdata", SEC_HAS_CONTENTS, 3);
seg_pdata->contents = data;
memset (data, 0, pdata_size);
bfd_set_section_size (abfd, seg_pdata, pdata_size);
h = seh_ctx_root;
while (h != NULL)
{
pdata_offs = h->xdata_offset;
h->section = seg_pdata;
h->abfd = abfd;
if (h->done != 0)
{
seh_arm_create_pdata (h, data, pdata_offs);
h->done = 1;
}
h = h->next;
}
save_relocs (seg_pdata);
bfd_set_symtab (abfd, symtab, symptr);
bfd_set_section_contents (abfd, seg_pdata, data, 0, pdata_size);
}
/* Do object finalization to generate and write pdata/xdata
for arm and x64 target. */
void
obj_coff_seh_do_final (void)
{
switch (seh_get_target_kind ())
{
case seh_kind_mips:
default:
break;
case seh_kind_arm:
seh_arm_write_pdata ();
break;
case seh_kind_x64:
seh_x64_write_xdata ();
break;
}
}
/* Enter a prologue element into current context. */
static void
seh_x64_make_prologue_element (int kind, int reg, bfd_vma off)
{
seh_prologue_element *n;
if (seh_ctx_cur == NULL)
return;
if (seh_ctx_cur->elems_count == seh_ctx_cur->elems_max)
{
seh_ctx_cur->elems = (seh_prologue_element *)
xrealloc (seh_ctx_cur->elems,
((seh_ctx_cur->elems_max + 8) * sizeof (seh_prologue_element)));
seh_ctx_cur->elems_max += 8;
}
n = &seh_ctx_cur->elems[seh_ctx_cur->elems_count];
memset (n, 0, sizeof (seh_prologue_element));
n->kind = kind;
n->reg = reg;
n->offset = off;
n->pc_symbol = make_seh_text_label (seh_ctx_cur, &(n->pc_addr));
seh_ctx_cur->elems_count += 1;
}
/* Helper to read a register name from input stream. */
static int
seh_x64_read_reg (const char *tok, int kind, int *regno)
{
static const char *frame_regs[16] =
{ "cfa", "rcx", "rdx", "rbx", "rsp", "rbp","rsi","rdi",
"r8","r9","r10","r11","r12","r13","r14","r15" };
static const char *int_regs[16] =
{ "rax", "rcx", "rdx", "rbx", "rsp", "rbp","rsi","rdi",
"r8","r9","r10","r11","r12","r13","r14","r15" };
static const char *xmm_regs[16] =
{ "xmm0", "xmm1", "xmm2", "xmm3", "xmm4", "xmm5", "xmm6", "xmm7",
"xmm8", "xmm9", "xmm10","xmm11","xmm12","xmm13","xmm14","xmm15" };
static const char *mm_regs[16] =
{ "xmm0", "mm1", "mm2", "mm3", "mm4", "mm5", "mm6", "mm7",
"xmm8", "mm9", "mm10","mm11","mm12","mm13","mm14","mm15" };
const char **p = NULL;
char name_end;
char *symbol_name = NULL;
int i;
while (*input_line_pointer == ' ' || *input_line_pointer == '\t')
input_line_pointer++;
while (*input_line_pointer == ' ' || *input_line_pointer == '\t')
input_line_pointer++;
switch (kind)
{
case 0:
p = frame_regs;
break;
case 1:
p = int_regs;
break;
case 2:
p = mm_regs;
break;
case 3:
p = xmm_regs;
break;
default:
abort ();
}
if (*input_line_pointer == 0 || *input_line_pointer == '\n')
return 0;
if (*input_line_pointer == '%')
++input_line_pointer;
symbol_name = input_line_pointer;
name_end = get_symbol_end ();
for (i = 0; i < 16; i++)
if (! strcasecmp (p[i], symbol_name))
break;
if (i == 16)
as_warn (_("In %s we found the invalid register name %s.\n"),
tok, symbol_name);
*input_line_pointer = name_end;
while (*input_line_pointer == ' ' || *input_line_pointer == '\t')
input_line_pointer++;
if (*input_line_pointer == ',')
++input_line_pointer;
while (*input_line_pointer == ' ' || *input_line_pointer == '\t')
input_line_pointer++;
*regno = i;
return i != 16;
}
/* Read an numeric value from input stream. */
static int
seh_read_offset (const char *tok, bfd_vma *off)
{
bfd_vma r, v = 0, base = 10;
int had_one = 0;
int neg = 0;
while (*input_line_pointer == ' ' || *input_line_pointer == '\t')
input_line_pointer++;
if (*input_line_pointer == '$')
++input_line_pointer;
if (*input_line_pointer == '-')
{
neg = 1;
++input_line_pointer;
}
else if (*input_line_pointer == '+')
{
++input_line_pointer;
}
if (*input_line_pointer == '0')
{
++input_line_pointer;
had_one = 1;
base = 8;
switch ((*input_line_pointer))
{
case 'x':
case 'X':
base = 16;
++input_line_pointer;
break;
case 'd':
case 'D':
base = 10;
input_line_pointer++;
break;
case 'o':
case 'O':
base = 8;
input_line_pointer++;
break;
}
}
while (*input_line_pointer != 0)
{
if (input_line_pointer[0] >= '0' && input_line_pointer[0] <='9')
r = (bfd_vma) (input_line_pointer[0] - '0');
else if (base == 16 && input_line_pointer[0] >= 'a' && input_line_pointer[0] <='f')
r = (bfd_vma) ((input_line_pointer[0] - 'a') + 10);
else if (base == 16 && input_line_pointer[0] >= 'A' && input_line_pointer[0] <='F')
r = (bfd_vma) ((input_line_pointer[0] - 'A') + 10);
else
break;
input_line_pointer++;
v *= base;
v += r;
had_one = 1;
}
if (neg)
v = (bfd_vma) (v ^ ((bfd_vma) -1LL)) + (bfd_vma) 1ULL;
*off = v;
if (had_one == 0)
{
as_warn (_("In %s we expect a number.\n"),
tok);
}
while (*input_line_pointer == ' ' || *input_line_pointer == '\t')
input_line_pointer++;
if (*input_line_pointer == ',')
++input_line_pointer;
while (*input_line_pointer == ' ' || *input_line_pointer == '\t')
input_line_pointer++;
return had_one != 0;
}
/* Mark current context to use 32-bit instruction (arm). */
static void
obj_coff_seh_32 (int what)
{
if (seh_ctx_cur == NULL)
{
as_fatal (_(".seh_eh requires to be in .seh_proc/.seh_endproc block.\n"));
demand_empty_rest_of_line ();
return;
}
seh_ctx_cur->use_instruction_32 = (what ? 1 : 0);
if (seh_get_target_kind () == seh_kind_arm)
as_warn (_(".seh_%s32 is ignored for this target."), (what ? "" : "no"));
demand_empty_rest_of_line ();
}
/* Set for current context the handler and optional data (arm). */
static void
obj_coff_seh_eh (int what ATTRIBUTE_UNUSED)
{
if (seh_ctx_cur == NULL)
{
as_fatal (_(".seh_eh requires to be in .seh_proc/.seh_endproc block.\n"));
demand_empty_rest_of_line ();
return;
}
if (seh_get_target_kind () == seh_kind_arm)
{
seh_ctx_cur->handler_written = 1;
/* write block to .text if exception handler is set. */
seh_write_text_eh_data (seh_ctx_cur->handler_name, seh_ctx_cur->handler_data_name);
}
demand_empty_rest_of_line ();
}
/* Set for current context the default handler (x64). */
static void
obj_coff_seh_handler (int what ATTRIBUTE_UNUSED)
{
char *symbol_name;
char name_end;
if (seh_ctx_cur == NULL)
{
as_fatal (_(".seh_handler requires to be in .seh_proc/.seh_endproc block.\n"));
demand_empty_rest_of_line ();
return;
}
if (*input_line_pointer == 0 || *input_line_pointer == '\n')
{
as_fatal (_(".seh_handler requires a handler lable name.\n"));
demand_empty_rest_of_line ();
return;
}
while (*input_line_pointer == ' ' || *input_line_pointer == '\t' || *input_line_pointer == ',')
input_line_pointer++;
symbol_name = input_line_pointer;
name_end = get_symbol_end ();
seh_ctx->handler_name = xstrdup (symbol_name);
if (symbol_name[0] == '@')
{
if (strcasecmp (symbol_name, "@0") != 0 && strcasecmp (symbol_name, "@1") != 0
&& strcasecmp (symbol_name, "@null") != 0)
as_warn (_("Unknown constant value ,%s' for handler."), symbol_name);
}
*input_line_pointer = name_end;
seh_ctx->handler_data_name = NULL;
while (*input_line_pointer == ' ' || *input_line_pointer == '\t' || *input_line_pointer == ',')
input_line_pointer++;
symbol_name = input_line_pointer;
if (*input_line_pointer != '\n' && *input_line_pointer != 0)
{
name_end = get_symbol_end ();
seh_ctx->handler_data_name = xstrdup (symbol_name);
if (symbol_name[0] == '@')
{
if (seh_get_target_kind () != seh_kind_x64)
as_fatal (_("For this target .seh_handler doesn't support constant user-data."));
else if (strcasecmp (symbol_name, "@unwind") != 0 &&
strcasecmp (symbol_name, "@except") != 0)
as_warn (_("For .seh_handler the constant ,%s' is ignored."), symbol_name);
}
*input_line_pointer = name_end;
}
if (seh_ctx_cur->handler_written)
as_warn (_(".seh_handler is ignored as .seh_eh was seen before."));
demand_empty_rest_of_line ();
}
/* Add a scope-element for exception region (x64). */
static void
obj_coff_seh_scope (int what ATTRIBUTE_UNUSED)
{
char *symbol_name,*beg = NULL,*end = NULL, *handl = NULL, *jmp = NULL;
char name_end;
if (seh_ctx_cur == NULL)
{
as_fatal (_(".seh_scope requires to be in .seh_proc/.seh_endproc block.\n"));
demand_empty_rest_of_line ();
return;
}
while (*input_line_pointer == ' ' || *input_line_pointer == '\t' || *input_line_pointer == ',')
input_line_pointer++;
if (*input_line_pointer == 0 || *input_line_pointer == '\n')
{
as_fatal (_(".seh_scope requires four symbol names.\n"));
demand_empty_rest_of_line ();
return;
}
symbol_name = input_line_pointer;
name_end = get_symbol_end ();
beg = xstrdup (symbol_name);
*input_line_pointer = name_end;
while (*input_line_pointer == ' ' || *input_line_pointer == '\t' || *input_line_pointer == ',')
input_line_pointer++;
if (*input_line_pointer == 0 || *input_line_pointer == '\n')
{
as_fatal (_(".seh_scope requires three more symbol names.\n"));
demand_empty_rest_of_line ();
return;
}
symbol_name = input_line_pointer;
name_end = get_symbol_end ();
end = xstrdup (symbol_name);
*input_line_pointer = name_end;
while (*input_line_pointer == ' ' || *input_line_pointer == '\t' || *input_line_pointer == ',')
input_line_pointer++;
if (*input_line_pointer == 0 || *input_line_pointer == '\n')
{
as_fatal (_(".seh_scope requires two more symbol names.\n"));
demand_empty_rest_of_line ();
return;
}
symbol_name = input_line_pointer;
name_end = get_symbol_end ();
handl = xstrdup (symbol_name);
*input_line_pointer = name_end;
if (*handl == '@')
{
if (strcasecmp (handl, "@0") != 0 && strcasecmp (handl, "@1") != 0
&& strcasecmp (handl, "@null") != 0)
as_warn (_("Unknown constant for handler ,%s'."), handl);
}
while (*input_line_pointer == ' ' || *input_line_pointer == '\t' || *input_line_pointer == ',')
input_line_pointer++;
if (*input_line_pointer == 0 || *input_line_pointer == '\n')
{
as_fatal (_(".seh_scope requires one more symbol names.\n"));
demand_empty_rest_of_line ();
return;
}
symbol_name = input_line_pointer;
name_end = get_symbol_end ();
jmp = xstrdup (symbol_name);
*input_line_pointer = name_end;
if (*jmp == '@')
{
if (strcasecmp (jmp, "@0") != 0 && strcasecmp (handl, "@null") != 0)
as_warn (_("Unknown constant for jump ,%s'."), jmp);
}
if (seh_get_target_kind () != seh_kind_x64)
as_warn (_(".seh_scope is ignored for this target."));
else
seh_x64_makescope_elem (seh_ctx_cur, beg, end, handl, jmp);
if (beg)
free (beg);
if (end)
free (end);
if (handl)
free (handl);
if (jmp)
free (jmp);
demand_empty_rest_of_line ();
}
/* Mark begin of new context. */
static void
obj_coff_seh_proc (int what ATTRIBUTE_UNUSED)
{
char *symbol_name;
char name_end;
if (seh_ctx_cur != NULL)
{
as_warn (_(".seh_proc has to be closed by .seh_endprog\n"));
obj_coff_seh_endproc (0);
}
if (*input_line_pointer == 0 || *input_line_pointer == '\n')
{
as_fatal (_(".seh_proc requires function lable name.\n"));
demand_empty_rest_of_line ();
return;
}
while (*input_line_pointer == ' ' || *input_line_pointer == '\t' || *input_line_pointer == ',')
input_line_pointer++;
symbol_name = input_line_pointer;
name_end = get_symbol_end ();
if (seh_ctx == NULL)
seh_ctx_root = seh_ctx = (seh_context *) xmalloc (sizeof (seh_context));
else
{
seh_ctx->next = (seh_context *) xmalloc (sizeof (seh_context));
seh_ctx = seh_ctx->next;
}
seh_ctx_cur = seh_ctx;
memset (seh_ctx, 0, sizeof (seh_context));
seh_ctx->func_name = xstrdup (symbol_name);
*input_line_pointer = name_end;
while (*input_line_pointer == ' ' || *input_line_pointer == '\t' || *input_line_pointer == ',')
input_line_pointer++;
seh_ctx->start_symbol = make_seh_text_label (seh_ctx_cur, &(seh_ctx_cur->start_addr));
demand_empty_rest_of_line ();
}
/* Mark end of current context. */
static void
obj_coff_seh_endproc (int what ATTRIBUTE_UNUSED)
{
if (seh_ctx_cur == NULL)
{
as_warn (_(".seh_endprog without prior .seh_proc (ignored)\n"));
demand_empty_rest_of_line ();
return;
}
seh_ctx->end_symbol = make_seh_text_label (seh_ctx, &(seh_ctx->end_addr));
seh_ctx->xdata_first = seh_make_xlbl_name (seh_ctx);
make_function_entry_pdata (seh_ctx);
seh_ctx_cur = NULL;
demand_empty_rest_of_line ();
}
/* Add a push-unwind-information to current context.
what:0 push volatile reg, 1: push machine frame, 2: set fp register. */
static void
obj_coff_seh_push (int what)
{
int reg = 0;
int kind = -1;
bfd_vma off = 0;
if (seh_ctx_cur == NULL)
{
as_warn (_(".seh_push used outside of .seh_proc block.\n"));
demand_empty_rest_of_line ();
return;
}
/* What 0:reg, 1:pushframe. */
switch (what)
{
case 0:
if (seh_x64_read_reg (".seh_pushreg", 1, &reg))
kind = UWOP_PUSH_NONVOL;
else
as_warn (_(".seh_pushreg expects register argument."));
break;
case 1:
kind = UWOP_PUSH_MACHFRAME;
break;
default:
abort ();
}
if (seh_get_target_kind () != seh_kind_x64)
as_warn (_(".seh_save... is ignored for this target.\n"));
else if (kind != -1)
seh_x64_make_prologue_element (kind, reg, off);
demand_empty_rest_of_line ();
}
/* Add a register save-unwind-information to current context. */
static void
obj_coff_seh_save (int what)
{
int reg;
bfd_vma off;
int kind;
int ok = 1;
/* what 0:reg, 1:mm, 2:xmm. */
switch (what)
{
case 0:
ok &= seh_x64_read_reg (".seh_savereg", 1, &reg);
kind = UWOP_SAVE_NONVOL;
break;
case 1:
ok &= seh_x64_read_reg (".seh_savemm", 2, &reg);
kind = UWOP_SAVE_XMM;
break;
case 2:
ok &= seh_x64_read_reg (".seh_savexmm", 3, &reg);
kind = UWOP_SAVE_XMM128;
break;
default:
abort ();
}
ok &= seh_read_offset (".seh_save", &off);
if (seh_ctx_cur == NULL)
{
as_warn (_(".seh_save used outside of .seh_proc block.\n"));
demand_empty_rest_of_line ();
return;
}
if (seh_get_target_kind () != seh_kind_x64)
as_warn (_(".seh_save... is ignored for this target.\n"));
else
seh_x64_make_prologue_element (kind, reg, off);
demand_empty_rest_of_line ();
}
/* Mark end of prologue for current context. */
static void
obj_coff_seh_endprologue (int what ATTRIBUTE_UNUSED)
{
if (seh_ctx_cur == NULL)
{
as_warn (_(".seh_endprologue used outside of .seh_proc block.\n"));
demand_empty_rest_of_line ();
return;
}
if (seh_ctx_cur->endprologue_symbol != NULL)
as_warn (_(".seh_endprologue used more then once in .seh_proc block.\n"));
else
seh_ctx_cur->endprologue_symbol = make_seh_text_label (seh_ctx_cur, &seh_ctx_cur->endprologue_addr);
}
/* Add a stack-allocation-unwind-information for current context. */
static void
obj_coff_seh_stack_alloc (int what ATTRIBUTE_UNUSED)
{
bfd_vma size;
if (seh_ctx_cur == NULL)
{
as_warn (_(".seh_stackalloc used outside of .seh_proc block.\n"));
demand_empty_rest_of_line ();
return;
}
if (seh_read_offset (".seh_stackalloc", &size))
{
if (seh_get_target_kind () != seh_kind_x64)
as_warn (_(".seh_stackalloc is ignored for this target.\n"));
else
seh_x64_make_prologue_element (UWOP_ALLOC_LARGE, 0, size);
}
}
/* Add frame-pointer-unwind-information to current context. */
static void
obj_coff_seh_setframe (int what ATTRIBUTE_UNUSED)
{
int kind = -1;
int reg;
int ok = 1;
bfd_vma off;
ok &= seh_x64_read_reg (".seh_setframe", 0, &reg);
ok &= seh_read_offset (".seh_setframe", &off);
if (seh_ctx_cur == NULL)
{
as_warn (_(".seh_setframe used outside of .seh_proc block.\n"));
demand_empty_rest_of_line ();
return;
}
if (ok)
{
seh_ctx_cur->framereg = reg;
seh_ctx_cur->frameoff = off;
kind = UWOP_SET_FPREG;
}
if (seh_get_target_kind () != seh_kind_x64)
as_warn (_(".seh_setframe is ignored for this target.\n"));
else if (kind != -1)
seh_x64_make_prologue_element (kind, reg, off);
demand_empty_rest_of_line ();
}
/* Misc function helpers. */
static void
seh_reloc (bfd *abfd, bfd_size_type address, int which_howto, int symidx)
{
if (relcount >= relsize - 1)
{
relsize += 10;
if (reltab)
reltab = xrealloc (reltab, relsize * sizeof (arelent));
else
reltab = xmalloc (relsize * sizeof (arelent));
}
reltab[relcount].address = address;
reltab[relcount].addend = 0;
reltab[relcount].howto = bfd_reloc_type_lookup (abfd, which_howto);
reltab[relcount].sym_ptr_ptr = symtab + symidx;
relcount++;
}
static void
save_relocs (asection *sec)
{
int i;
sec->relocation = reltab;
sec->reloc_count = relcount;
sec->orelocation = xmalloc ((relcount + 1) * sizeof (arelent *));
for (i = 0; i < relcount; i++)
sec->orelocation[i] = sec->relocation + i;
sec->orelocation[relcount] = 0;
sec->flags |= SEC_RELOC;
reltab = 0;
relcount = relsize = 0;
}
static void
seh_symbol_init (bfd *abfd, unsigned int added)
{
unsigned int oldcount;
oldcount = bfd_get_symcount (abfd);
symptr = oldcount;
symtab = xmalloc ((oldcount + added + 6) * sizeof (asymbol *));
if (oldcount > 0)
memcpy (symtab, bfd_get_outsymbols (abfd), sizeof (asymbol *) * oldcount);
}
static int
seh_symbol (bfd *abfd, const char *n1, const char *n2, const char *n3,
asection *sec, int flags, int addr)
{
asymbol *sym;
char *name = xmalloc (strlen (n1) + strlen (n2) + strlen (n3) + 1);
int ret = symptr;
strcpy (name, n1);
strcat (name, n2);
strcat (name, n3);
sym = bfd_make_empty_symbol (abfd);
sym->name = name;
sym->section = sec;
sym->flags = flags;
sym->value = addr;
symtab[symptr++] = sym;
return ret;
}
static asection *
quick_section (bfd *abfd, const char *name, int flags, int align)
{
asection *sec;
asymbol *sym;
sec = seh_make_section2 (name, flags);
bfd_set_section_alignment (abfd, sec, align);
/* Remember to undo this before trying to link internally! */
sym = bfd_make_empty_symbol (abfd);
symtab[symptr++] = sym;
sym->name = sec->name;
sym->section = sec;
sym->flags = BSF_LOCAL;
sym->value = 0;
return sec;
}
static seh_kind
seh_get_target_kind (void)
{
if (!stdoutput)
return seh_kind_unknown;
switch (bfd_get_arch (stdoutput))
{
case bfd_arch_arm:
case bfd_arch_powerpc:
case bfd_arch_sh:
return seh_kind_arm;
case bfd_arch_i386:
switch (bfd_get_mach (stdoutput))
{
case bfd_mach_x86_64:
case bfd_mach_x86_64_intel_syntax:
return seh_kind_x64;
default:
break;
}
/* FALL THROUGH. */
case bfd_arch_mips:
return seh_kind_mips;
case bfd_arch_ia64:
/* Should return seh_kind_x64. But not implemented yet. */
return seh_kind_unknown;
default:
break;
}
return seh_kind_unknown;
}
static void
seh_emit_rva (const char *name)
{
char *p = (char *) xmalloc (strlen (name) + 1);
char *s = input_line_pointer;
strcpy (p, name);
input_line_pointer = p;
s_rva (4);
input_line_pointer = s;
}
static void
seh_emit_long (const char *name)
{
char *p = (char *) xmalloc (strlen (name) + 1);
char *s = input_line_pointer;
strcpy (p, name);
input_line_pointer = p;
cons (4);
input_line_pointer = s;
}
static void
seh_make_globl (char *sym_name)
{
char *s = input_line_pointer;
input_line_pointer = sym_name;
s_globl (4);
input_line_pointer = s;
}
static segT
seh_make_section2 (const char *section_name, unsigned flags)
{
char *name;
segT sec;
name = xmalloc (strlen (section_name) + 1);
strcpy (name, section_name);
sec = subseg_new (name, (subsegT) 0);
bfd_set_section_flags (stdoutput, sec,
((SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_DATA | flags)
& bfd_applicable_section_flags (stdoutput)));
return sec;
}
static segT
seh_make_section (void)
{
static segT seg_pdata = NULL;
segT sec = NULL;
if (!seg_pdata)
seg_pdata = seh_make_section2 (".pdata", 0);
sec = seg_pdata;
return sec;
}
static char *
seh_make_xlbl_name (seh_context *c)
{
size_t len = strlen (".seh_xlbl_") + strlen (c->func_name) + 9 + 1;
char *ret = (char*) xmalloc (len);
if (!ret)
as_fatal (_("Out of memory for xdata lable for %s"), c->func_name);
else
sprintf (ret, ".seh_xlbl_%s_%x", c->func_name, + c->xlbl_count);
c->xlbl_count += 1;
return ret;
}
static char *
make_seh_text_label (seh_context *c, symbolS **addr)
{
char *sym_name;
size_t len = strlen (".seh_tlbl_") + strlen (c->func_name) + 9 + 1;
sym_name = (char *) xmalloc (len);
if (!sym_name)
as_fatal (_("Allocating memory for SEH's text symbol for %s failed"), c->func_name);
sprintf (sym_name, ".seh_tlbl_%s_%x", c->func_name, c->tlbl_count);
c->tlbl_count += 1;
if (addr)
{
seh_make_globl (sym_name);
*addr = colon (sym_name);
}
return sym_name;
}
/* x64 secific functions. */
static void
seh_fill_pcsyms (const seh_context *c, char **names, int *idx)
{
size_t i;
int count = 1;
valueT start_off = resolve_symbol_value (c->start_addr);
valueT un_off;
seh_prologue_element *e = c->elems;
names[0] = c->start_symbol;
idx[0] = 0;
if (c->elems_count == 0)
return;
for (i = 0; i < c->elems_count; i++)
{
un_off = resolve_symbol_value (e[i].pc_addr);
if ((un_off - start_off) > 255)
{
names[count] = e[i].pc_symbol;
idx[count] = (int) i;
count++;
start_off = un_off;
}
}
}
static int
seh_needed_unwind_info (seh_context *c)
{
size_t i;
int count = 1;
valueT start_off = resolve_symbol_value (c->start_addr);
valueT un_off;
seh_prologue_element *e = c->elems;
if (c->elems_count == 0)
return count;
for (i = 0; i < c->elems_count; i++)
{
un_off = resolve_symbol_value (e[i].pc_addr);
if ((un_off - start_off) > 255)
{
count++;
start_off = un_off;
}
}
return count;
}
static void
seh_store_elm_data (const seh_context *c, int elm_start,int elm_end, unsigned char *puwop, valueT base)
{
int i = elm_end;
valueT off;
/* We have to store in reverse order. */
while (i > elm_start)
{
--i;
/* First comes byte offset in code. */
off = resolve_symbol_value (c->elems[i].pc_addr) - base;
*puwop++ = (unsigned char) off;
switch (c->elems[i].kind)
{
case UWOP_PUSH_NONVOL:
*puwop = UWOP_PUSH_NONVOL | (c->elems[i].reg << 4);
puwop++;
break;
case UWOP_SET_FPREG:
*puwop++ = UWOP_SET_FPREG;
break;
case UWOP_PUSH_MACHFRAME:
*puwop = UWOP_PUSH_MACHFRAME | (c->elems[i].reg << 4);
puwop++;
break;
case UWOP_SAVE_NONVOL:
if ((c->elems[i].offset & 7) != 0 ||
((c->elems[i].offset / 8) > 0xffff))
{
*puwop++ = UWOP_SAVE_NONVOL_FAR | (c->elems[i].reg << 4);
bfd_putl32 ((bfd_vma) c->elems[i].offset, puwop);
puwop += 4;
}
else
{
*puwop++ = UWOP_SAVE_NONVOL | (c->elems[i].reg << 4);
bfd_putl16 ((bfd_vma) (c->elems[i].offset / 8), puwop);
puwop += 2;
}
break;
case UWOP_SAVE_XMM:
if ((c->elems[i].offset & 7) != 0 ||
((c->elems[i].offset / 8) > 0xffff))
{
*puwop++ = UWOP_SAVE_XMM_FAR | (c->elems[i].reg << 4);
bfd_putl32 ((bfd_vma) c->elems[i].offset, puwop);
puwop += 4;
}
else
{
*puwop++ = UWOP_SAVE_XMM | (c->elems[i].reg << 4);
bfd_putl16 ((bfd_vma) (c->elems[i].offset / 8), puwop);
puwop += 2;
}
break;
case UWOP_SAVE_XMM128:
if ((c->elems[i].offset & 7) != 0 ||
((c->elems[i].offset / 8) > 0xffff))
{
*puwop++ = UWOP_SAVE_XMM128_FAR | (c->elems[i].reg << 4);
bfd_putl32 ((bfd_vma) c->elems[i].offset, puwop);
puwop += 4;
}
else
{
*puwop++ = UWOP_SAVE_XMM128 | (c->elems[i].reg << 4);
bfd_putl16 ((bfd_vma) (c->elems[i].offset / 8), puwop);
puwop += 2;
}
break;
case UWOP_ALLOC_LARGE:
if ((c->elems[i].offset & 7) != 0 ||
((c->elems[i].offset / 8) > 0xffff))
{
*puwop++ = UWOP_ALLOC_LARGE | (1 << 4);
bfd_putl32 ((bfd_vma) c->elems[i].offset, puwop);
puwop += 4;
}
else if ((c->elems[i].offset / 8) <= 0x10)
{
*puwop++ = UWOP_ALLOC_SMALL | (((c->elems[i].offset / 8) - 1) << 4);
}
else
{
*puwop++ = UWOP_ALLOC_LARGE;
bfd_putl16 ((bfd_vma) (c->elems[i].offset / 8), puwop);
puwop += 2;
}
break;
default:
puwop++;
abort ();
break;
}
}
}
static size_t
seh_getelm_data_size (const seh_context *c, int elm_start, int elm_end, size_t *unaligned_uwcodes)
{
size_t ret = 0;
while (elm_start < elm_end)
{
switch (c->elems[elm_start].kind)
{
case UWOP_PUSH_NONVOL:
case UWOP_PUSH_MACHFRAME:
ret += 2;
break;
case UWOP_SAVE_NONVOL:
case UWOP_SAVE_XMM:
case UWOP_SAVE_XMM128:
if ((c->elems[elm_start].offset & 7) != 0 ||
((c->elems[elm_start].offset / 8) > 0xffff))
ret += 6;
else
ret += 4;
break;
case UWOP_ALLOC_LARGE:
if ((c->elems[elm_start].offset & 7) != 0 ||
((c->elems[elm_start].offset / 8) > 0xffff))
ret += 6;
else if ((c->elems[elm_start].offset / 8) <= 0x10)
ret += 2;
else
ret += 4;
break;
case UWOP_SET_FPREG:
ret += 2;
break;
default:
ret += 2;
break;
}
elm_start++;
}
if (unaligned_uwcodes)
*unaligned_uwcodes = ret;
ret = PEX64_UWI_SIZEOF_UWCODE_ARRAY ((ret / 2));
return ret;
}
static size_t
seh_getsize_of_unwind_entry (seh_context *c, int elm_start, int elm_end, int bechain)
{
size_t ret = seh_getelm_data_size(c, elm_start, elm_end, NULL);
c->count_syms += 1;
if (bechain)
{
ret += 4 + 4;
c->count_syms += 1;
c->count_reloc += 1;
}
else
{
ret += 4;
if (c->handler_name != NULL)
{
if (c->handler_data_name != NULL
&& c->handler_data_name[0] != '@')
{
ret += 4;
c->count_syms += 2;
c->count_reloc += 2;
}
else
{
ret += 8 + (c->scope_count * 4) * 4;
c->count_syms += (c->scope_count * 4) + 1;
c->count_reloc += (c->scope_count * 4) + 1;
}
}
}
return ret;
}
static void
seh_make_unwind_entry (const seh_context *c, char *name, int elm_start, int elm_end, int bechain,
unsigned char *data, size_t *poffs, int no)
{
size_t off = *poffs;
size_t it;
valueT start_off = resolve_symbol_value (c->start_addr);
valueT end_prologue;
size_t unaligned_uwcodes = 0;
size_t uwcodes = seh_getelm_data_size(c, elm_start, elm_end, &unaligned_uwcodes);
unsigned int flag = UNW_FLAG_NHANDLER;
int idx;
if (c->handler_name != NULL)
{
flag = UNW_FLAG_EHANDLER;
if (c->handler_data_name != NULL && c->handler_data_name[0] != '@')
flag = UNW_FLAG_FHANDLER;
else if (c->handler_data_name != NULL &&
strcasecmp (c->handler_data_name, "@unwind") == 0)
flag = UNW_FLAG_UHANDLER;
}
if (!c->endprologue_addr)
end_prologue = start_off;
else
end_prologue = resolve_symbol_value (c->endprologue_addr);
seh_symbol (c->abfd, name, "", "", c->section, BSF_GLOBAL, (int) off);
data[off++] = (1 | ((bechain ? UNW_FLAG_CHAININFO : flag) << 3));
if (elm_start != 0)
start_off = (valueT) c->elems[elm_start].offset;
end_prologue -= start_off;
if (end_prologue > 255)
end_prologue = 255;
data[off++] = (unsigned char) end_prologue;
data[off++] = (unsigned char) (unaligned_uwcodes / 2);
data[off] = (unsigned char) c->framereg;
data[off++] |= (unsigned char) ((c->frameoff / 16) << 4);
seh_store_elm_data (c, elm_start, elm_end, &data[off], start_off);
off += uwcodes;
if (bechain)
{
char n[100];
sprintf (n,"%x", no);
idx = seh_symbol (c->abfd, ".xdata_fct", c->func_name, n, UNDSEC, BSF_GLOBAL, (int) off);
seh_reloc (c->abfd, off, BFD_RELOC_RVA, idx);
off += 4;
}
else if (c->handler_name != NULL)
{
if (flag == UNW_FLAG_FHANDLER)
{
if (strcasecmp (c->handler_name, "@1") == 0)
bfd_put_32 (c->abfd, (bfd_vma) 1, &data[off]);
else if (c->handler_name[0] != '@')
{
idx = seh_symbol (c->abfd, c->handler_name, "", "", UNDSEC, BSF_GLOBAL, 0);
seh_reloc (c->abfd, off, BFD_RELOC_RVA, idx);
}
off += 4;
idx = seh_symbol (c->abfd, c->handler_data_name, "", "", UNDSEC, BSF_GLOBAL, 0);
seh_reloc (c->abfd, off, BFD_RELOC_RVA, idx);
off += 4;
}
else if (flag == UNW_FLAG_UHANDLER || flag == UNW_FLAG_EHANDLER)
{
if (strcasecmp (c->handler_name, "@1") == 0)
bfd_put_32 (c->abfd, (bfd_vma) 1, &data[off]);
else if (c->handler_name[0] != '@')
{
idx = seh_symbol (c->abfd, c->handler_name, "", "", UNDSEC, BSF_GLOBAL, 0);
seh_reloc (c->abfd, off, BFD_RELOC_RVA, idx);
}
off += 4;
bfd_put_32 (c->abfd, (bfd_vma) c->scope_count, &data[off]);
off += 4;
for (it = 0; it < c->scope_count; it++)
{
idx = seh_symbol (c->abfd, c->scopes[it].begin_addr, "", "", UNDSEC, BSF_GLOBAL, 0);
seh_reloc (c->abfd, off, BFD_RELOC_RVA, idx);
off += 4;
idx = seh_symbol (c->abfd, c->scopes[it].end_addr, "", "", UNDSEC, BSF_GLOBAL, 0);
seh_reloc (c->abfd, off, BFD_RELOC_RVA, idx);
off += 4;
if (c->scopes[it].handler_addr[0] == '@')
{
if (strcasecmp (c->scopes[it].handler_addr, "@1") == 0)
bfd_put_32 (c->abfd, (bfd_vma) 1, &data[off]);
}
else
{
idx = seh_symbol (c->abfd, c->scopes[it].handler_addr, "", "", UNDSEC, BSF_GLOBAL, 0);
seh_reloc (c->abfd, off, BFD_RELOC_RVA, idx);
}
off += 4;
if (c->scopes[it].jump_addr[0] == '@')
{
if (strcasecmp (c->scopes[it].jump_addr, "@1") == 0)
bfd_put_32 (c->abfd, (bfd_vma) 1, &data[off]);
}
else
{
idx = seh_symbol (c->abfd, c->scopes[it].jump_addr, "", "", UNDSEC, BSF_GLOBAL, 0);
seh_reloc (c->abfd, off, BFD_RELOC_RVA, idx);
}
off += 4;
}
}
}
*poffs = off;
}
static size_t
seh_getsize_unwind_data (seh_context *c)
{
int need = seh_needed_unwind_info (c);
int i;
char **names = (char **) xmalloc (sizeof (char *) * need);
char **pc_syms = (char **) xmalloc (sizeof (char *) * need);
int *elm_start = (int *) xmalloc (sizeof (int) * (need + 1));
size_t xdata_sz = 0;
seh_fill_pcsyms (c, pc_syms, elm_start);
elm_start[need] = c->elems_count;
xdata_sz += ((12 * (size_t) need));
c->count_syms += 5 * need;
xdata_sz += (seh_getsize_of_unwind_entry (c, elm_start[0], elm_start[1], 1 != need) + 7) & ~7;
for (i = 1; i < need; i++)
xdata_sz += (seh_getsize_of_unwind_entry (c, elm_start[i], elm_start[i + 1], 1 != need) + 7) & ~7;
/* Create lable names for .xdata unwind info. */
names[0] = c->xdata_first;
for (i = 1; i < need; i++)
names[i] = seh_make_xlbl_name (c);
c->xdata_names = names;
c->xdata_pcsyms = pc_syms;
c->xdata_elm_start = elm_start;
c->xdata_sz = xdata_sz;
return xdata_sz;
}
static void
seh_create_unwind_data (seh_context *c, unsigned char *data, size_t offs)
{
int need = seh_needed_unwind_info (c);
int i;
char **names = c->xdata_names;
char **pc_syms = c->xdata_pcsyms;
int *elm_start = c->xdata_elm_start;
for (i = 1; i < need; i++)
seh_make_function_entry_xdata (c, pc_syms[i], c->end_symbol, names[i], data, &offs, i);
/* Generate the function entry. Remark, that just
first is in .pdata section and already emitted. */
seh_make_unwind_entry (c, c->xdata_first, elm_start[0], elm_start[1], 1 != need, data, &offs, 1);
for (i = 1; i < need; i++)
seh_make_unwind_entry (c, names[i], elm_start[i], elm_start[i + 1], (i + 1) != need, data, &offs, i + 1);
for (i = 1; i < need; i++)
free (names[i]);
free (names);
free (pc_syms);
free (elm_start);
c->xdata_names = NULL;
c->xdata_pcsyms = NULL;
c->xdata_elm_start = NULL;
}
static void
seh_make_function_entry_xdata (seh_context *c, char *pc_start, char *pc_end, char *pc_xdata, unsigned char *data, size_t *poffs,int no)
{
bfd_vma addr = (bfd_vma) *poffs;
int idx;
char s[100];
if (!data)
return;
sprintf (s,"%x",no);
seh_symbol (c->abfd, ".xdata_fct",c->func_name, s, c->section, BSF_GLOBAL, (int) poffs[0]);
idx = seh_symbol (c->abfd, pc_start,"","", UNDSEC, BSF_GLOBAL,0);
seh_reloc (c->abfd, addr, BFD_RELOC_RVA, idx);
idx = seh_symbol (c->abfd, pc_end,"","", UNDSEC, BSF_GLOBAL,0);
seh_reloc (c->abfd, addr + 4, BFD_RELOC_RVA, idx);
idx = seh_symbol (c->abfd, pc_xdata,"","", UNDSEC, BSF_GLOBAL,0);
seh_reloc (c->abfd, addr + 8, BFD_RELOC_RVA, idx);
poffs[0] += 12;
}
static seh_scope_elem *
seh_x64_makescope_elem (seh_context *c, const char *begin, const char *end,
const char *handler, const char *jmp)
{
seh_scope_elem *r;
if (!end || !begin)
return NULL;
if (c->scope_count >= c->scope_max)
{
seh_scope_elem *h = (seh_scope_elem *) xmalloc (sizeof (seh_scope_elem) * (c->scope_max + 8));
memset (h, 0, sizeof (seh_scope_elem) * (c->scope_max + 8));
if (c->scopes != NULL)
memcpy (h, c->scopes, sizeof (seh_scope_elem) * c->scope_max);
if (c->scopes != NULL)
free (c->scopes);
c->scopes = h;
c->scope_max += 8;
}
r = &c->scopes[c->scope_count++];
r->begin_addr = xstrdup (begin);
r->end_addr = xstrdup (end);
r->handler_addr = (!handler ? NULL : xstrdup (handler));
r->jump_addr = (!jmp ? NULL : xstrdup (jmp));
return r;
}
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