/* seh pdata/xdata coff object file format
Copyright (C) 2009-2022 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"
/* Private segment collection list. */
struct seh_seg_list {
segT seg;
int subseg;
char *seg_name;
};
/* Local data. */
static seh_context *seh_ctx_cur = NULL;
static htab_t seh_hash;
static struct seh_seg_list *x_segcur = NULL;
static struct seh_seg_list *p_segcur = NULL;
static void write_function_xdata (seh_context *);
static void write_function_pdata (seh_context *);
/* Build based on segment the derived .pdata/.xdata
segment name containing origin segment's postfix name part. */
static char *
get_pxdata_name (segT seg, const char *base_name)
{
const char *name,*dollar, *dot;
char *sname;
name = bfd_section_name (seg);
dollar = strchr (name, '$');
dot = strchr (name + 1, '.');
if (!dollar && !dot)
name = "";
else if (!dollar)
name = dot;
else if (!dot)
name = dollar;
else if (dot < dollar)
name = dot;
else
name = dollar;
sname = concat (base_name, name, NULL);
return sname;
}
/* Allocate a seh_seg_list structure. */
static struct seh_seg_list *
alloc_pxdata_item (segT seg, int subseg, char *name)
{
struct seh_seg_list *r;
r = (struct seh_seg_list *)
xmalloc (sizeof (struct seh_seg_list) + strlen (name));
r->seg = seg;
r->subseg = subseg;
r->seg_name = name;
return r;
}
/* Generate pdata/xdata segment with same linkonce properties
of based segment. */
static segT
make_pxdata_seg (segT cseg, char *name)
{
segT save_seg = now_seg;
int save_subseg = now_subseg;
segT r;
flagword flags;
r = subseg_new (name, 0);
/* Check if code segment is marked as linked once. */
flags = (bfd_section_flags (cseg)
& (SEC_LINK_ONCE | SEC_LINK_DUPLICATES_DISCARD
| SEC_LINK_DUPLICATES_ONE_ONLY | SEC_LINK_DUPLICATES_SAME_SIZE
| SEC_LINK_DUPLICATES_SAME_CONTENTS));
/* Add standard section flags. */
flags |= SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_DATA;
/* Apply possibly linked once flags to new generated segment, too. */
if (!bfd_set_section_flags (r, flags))
as_bad (_("bfd_set_section_flags: %s"),
bfd_errmsg (bfd_get_error ()));
/* Restore to previous segment. */
subseg_set (save_seg, save_subseg);
return r;
}
static void
seh_hash_insert (const char *name, struct seh_seg_list *item)
{
str_hash_insert (seh_hash, name, item, 1);
}
static struct seh_seg_list *
seh_hash_find (char *name)
{
return (struct seh_seg_list *) str_hash_find (seh_hash, name);
}
static struct seh_seg_list *
seh_hash_find_or_make (segT cseg, const char *base_name)
{
struct seh_seg_list *item;
char *name;
/* Initialize seh_hash once. */
if (!seh_hash)
seh_hash = str_htab_create ();
name = get_pxdata_name (cseg, base_name);
item = seh_hash_find (name);
if (!item)
{
item = alloc_pxdata_item (make_pxdata_seg (cseg, name), 0, name);
seh_hash_insert (item->seg_name, item);
}
else
free (name);
return item;
}
/* Check if current segment has same name. */
static int
seh_validate_seg (const char *directive)
{
const char *cseg_name, *nseg_name;
if (seh_ctx_cur->code_seg == now_seg)
return 1;
cseg_name = bfd_section_name (seh_ctx_cur->code_seg);
nseg_name = bfd_section_name (now_seg);
as_bad (_("%s used in segment '%s' instead of expected '%s'"),
directive, nseg_name, cseg_name);
ignore_rest_of_line ();
return 0;
}
/* Switch back to the code section, whatever that may be. */
static void
obj_coff_seh_code (int ignored ATTRIBUTE_UNUSED)
{
subseg_set (seh_ctx_cur->code_seg, 0);
}
static void
switch_xdata (int subseg, segT code_seg)
{
x_segcur = seh_hash_find_or_make (code_seg, ".xdata");
subseg_set (x_segcur->seg, subseg);
}
static void
switch_pdata (segT code_seg)
{
p_segcur = seh_hash_find_or_make (code_seg, ".pdata");
subseg_set (p_segcur->seg, p_segcur->subseg);
}
/* Parsing routines. */
/* Return the style of SEH unwind info to generate. */
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;
}
/* Verify that we're in the context of a seh_proc. */
static int
verify_context (const char *directive)
{
if (seh_ctx_cur == NULL)
{
as_bad (_("%s used outside of .seh_proc block"), directive);
ignore_rest_of_line ();
return 0;
}
return 1;
}
/* Similar, except we also verify the appropriate target. */
static int
verify_context_and_target (const char *directive, seh_kind target)
{
if (seh_get_target_kind () != target)
{
as_warn (_("%s ignored for this target"), directive);
ignore_rest_of_line ();
return 0;
}
return verify_context (directive);
}
/* Skip whitespace and a comma. Error if the comma is not seen. */
static int
skip_whitespace_and_comma (int required)
{
SKIP_WHITESPACE ();
if (*input_line_pointer == ',')
{
input_line_pointer++;
SKIP_WHITESPACE ();
return 1;
}
else if (required)
{
as_bad (_("missing separator"));
ignore_rest_of_line ();
}
else
demand_empty_rest_of_line ();
return 0;
}
/* Mark current context to use 32-bit instruction (arm). */
static void
obj_coff_seh_32 (int what)
{
if (!verify_context_and_target ((what ? ".seh_32" : ".seh_no32"),
seh_kind_arm))
return;
seh_ctx_cur->use_instruction_32 = (what ? 1 : 0);
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 (!verify_context_and_target (".seh_eh", seh_kind_arm))
return;
/* Write block to .text if exception handler is set. */
seh_ctx_cur->handler_written = 1;
emit_expr (&seh_ctx_cur->handler, 4);
emit_expr (&seh_ctx_cur->handler_data, 4);
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 (!verify_context (".seh_handler"))
return;
if (*input_line_pointer == 0 || *input_line_pointer == '\n')
{
as_bad (_(".seh_handler requires a handler"));
demand_empty_rest_of_line ();
return;
}
SKIP_WHITESPACE ();
if (*input_line_pointer == '@')
{
name_end = get_symbol_name (&symbol_name);
seh_ctx_cur->handler.X_op = O_constant;
seh_ctx_cur->handler.X_add_number = 0;
if (strcasecmp (symbol_name, "@0") == 0
|| strcasecmp (symbol_name, "@null") == 0)
;
else if (strcasecmp (symbol_name, "@1") == 0)
seh_ctx_cur->handler.X_add_number = 1;
else
as_bad (_("unknown constant value '%s' for handler"), symbol_name);
(void) restore_line_pointer (name_end);
}
else
expression (&seh_ctx_cur->handler);
seh_ctx_cur->handler_data.X_op = O_constant;
seh_ctx_cur->handler_data.X_add_number = 0;
seh_ctx_cur->handler_flags = 0;
if (!skip_whitespace_and_comma (0))
return;
if (seh_get_target_kind () == seh_kind_x64)
{
do
{
name_end = get_symbol_name (&symbol_name);
if (strcasecmp (symbol_name, "@unwind") == 0)
seh_ctx_cur->handler_flags |= UNW_FLAG_UHANDLER;
else if (strcasecmp (symbol_name, "@except") == 0)
seh_ctx_cur->handler_flags |= UNW_FLAG_EHANDLER;
else
as_bad (_(".seh_handler constant '%s' unknown"), symbol_name);
(void) restore_line_pointer (name_end);
}
while (skip_whitespace_and_comma (0));
}
else
{
expression (&seh_ctx_cur->handler_data);
demand_empty_rest_of_line ();
if (seh_ctx_cur->handler_written)
as_warn (_(".seh_handler after .seh_eh is ignored"));
}
}
/* Switch to subsection for handler data for exception region (x64). */
static void
obj_coff_seh_handlerdata (int what ATTRIBUTE_UNUSED)
{
if (!verify_context_and_target (".seh_handlerdata", seh_kind_x64))
return;
demand_empty_rest_of_line ();
switch_xdata (seh_ctx_cur->subsection + 1, seh_ctx_cur->code_seg);
}
/* Mark end of current context. */
static void
do_seh_endproc (void)
{
seh_ctx_cur->end_addr = symbol_temp_new_now ();
write_function_xdata (seh_ctx_cur);
write_function_pdata (seh_ctx_cur);
seh_ctx_cur = NULL;
}
static void
obj_coff_seh_endproc (int what ATTRIBUTE_UNUSED)
{
demand_empty_rest_of_line ();
if (seh_ctx_cur == NULL)
{
as_bad (_(".seh_endproc used without .seh_proc"));
return;
}
seh_validate_seg (".seh_endproc");
do_seh_endproc ();
}
/* 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_bad (_("previous SEH entry not closed (missing .seh_endproc)"));
do_seh_endproc ();
}
if (*input_line_pointer == 0 || *input_line_pointer == '\n')
{
as_bad (_(".seh_proc requires function label name"));
demand_empty_rest_of_line ();
return;
}
seh_ctx_cur = XCNEW (seh_context);
seh_ctx_cur->code_seg = now_seg;
if (seh_get_target_kind () == seh_kind_x64)
{
x_segcur = seh_hash_find_or_make (seh_ctx_cur->code_seg, ".xdata");
seh_ctx_cur->subsection = x_segcur->subseg;
x_segcur->subseg += 2;
}
SKIP_WHITESPACE ();
name_end = get_symbol_name (&symbol_name);
seh_ctx_cur->func_name = xstrdup (symbol_name);
(void) restore_line_pointer (name_end);
demand_empty_rest_of_line ();
seh_ctx_cur->start_addr = symbol_temp_new_now ();
}
/* Mark end of prologue for current context. */
static void
obj_coff_seh_endprologue (int what ATTRIBUTE_UNUSED)
{
if (!verify_context (".seh_endprologue")
|| !seh_validate_seg (".seh_endprologue"))
return;
demand_empty_rest_of_line ();
if (seh_ctx_cur->endprologue_addr != NULL)
as_warn (_("duplicate .seh_endprologue in .seh_proc block"));
else
seh_ctx_cur->endprologue_addr = symbol_temp_new_now ();
}
/* End-of-file hook. */
void
obj_coff_seh_do_final (void)
{
if (seh_ctx_cur != NULL)
as_bad (_("open SEH entry at end of file (missing .seh_endproc)"));
}
/* Enter a prologue element into current context (x64). */
static void
seh_x64_make_prologue_element (int code, int info, offsetT 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_max += 8;
seh_ctx_cur->elems = XRESIZEVEC (seh_prologue_element,
seh_ctx_cur->elems,
seh_ctx_cur->elems_max);
}
n = &seh_ctx_cur->elems[seh_ctx_cur->elems_count++];
n->code = code;
n->info = info;
n->off = off;
n->pc_addr = symbol_temp_new_now ();
}
/* Helper to read a register name from input stream (x64). */
static int
seh_x64_read_reg (const char *directive, int kind)
{
static const char * const int_regs[16] =
{ "rax", "rcx", "rdx", "rbx", "rsp", "rbp","rsi","rdi",
"r8","r9","r10","r11","r12","r13","r14","r15" };
static const char * const xmm_regs[16] =
{ "xmm0", "xmm1", "xmm2", "xmm3", "xmm4", "xmm5", "xmm6", "xmm7",
"xmm8", "xmm9", "xmm10","xmm11","xmm12","xmm13","xmm14","xmm15" };
const char * const *regs = NULL;
char name_end;
char *symbol_name = NULL;
int i;
switch (kind)
{
case 0:
case 1:
regs = int_regs;
break;
case 2:
regs = xmm_regs;
break;
default:
abort ();
}
SKIP_WHITESPACE ();
if (*input_line_pointer == '%')
++input_line_pointer;
name_end = get_symbol_name (& symbol_name);
for (i = 0; i < 16; i++)
if (! strcasecmp (regs[i], symbol_name))
break;
(void) restore_line_pointer (name_end);
/* Error if register not found, or EAX used as a frame pointer. */
if (i == 16 || (kind == 0 && i == 0))
{
as_bad (_("invalid register for %s"), directive);
return -1;
}
return i;
}
/* Add a register push-unwind token to the current context. */
static void
obj_coff_seh_pushreg (int what ATTRIBUTE_UNUSED)
{
int reg;
if (!verify_context_and_target (".seh_pushreg", seh_kind_x64)
|| !seh_validate_seg (".seh_pushreg"))
return;
reg = seh_x64_read_reg (".seh_pushreg", 1);
demand_empty_rest_of_line ();
if (reg < 0)
return;
seh_x64_make_prologue_element (UWOP_PUSH_NONVOL, reg, 0);
}
/* Add a register frame-unwind token to the current context. */
static void
obj_coff_seh_pushframe (int what ATTRIBUTE_UNUSED)
{
int code = 0;
if (!verify_context_and_target (".seh_pushframe", seh_kind_x64)
|| !seh_validate_seg (".seh_pushframe"))
return;
SKIP_WHITESPACE();
if (is_name_beginner (*input_line_pointer))
{
char* identifier;
get_symbol_name (&identifier);
if (strcmp (identifier, "code") != 0)
{
as_bad(_("invalid argument \"%s\" for .seh_pushframe. Expected \"code\" or nothing"),
identifier);
return;
}
code = 1;
}
demand_empty_rest_of_line ();
seh_x64_make_prologue_element (UWOP_PUSH_MACHFRAME, code, 0);
}
/* Add a register save-unwind token to current context. */
static void
obj_coff_seh_save (int what)
{
const char *directive = (what == 1 ? ".seh_savereg" : ".seh_savexmm");
int code, reg, scale;
offsetT off;
if (!verify_context_and_target (directive, seh_kind_x64)
|| !seh_validate_seg (directive))
return;
reg = seh_x64_read_reg (directive, what);
if (!skip_whitespace_and_comma (1))
return;
off = get_absolute_expression ();
demand_empty_rest_of_line ();
if (reg < 0)
return;
if (off < 0)
{
as_bad (_("%s offset is negative"), directive);
return;
}
scale = (what == 1 ? 8 : 16);
if ((off & (scale - 1)) == 0 && off <= (offsetT) (0xffff * scale))
{
code = (what == 1 ? UWOP_SAVE_NONVOL : UWOP_SAVE_XMM128);
off /= scale;
}
else if (off < (offsetT) 0xffffffff)
code = (what == 1 ? UWOP_SAVE_NONVOL_FAR : UWOP_SAVE_XMM128_FAR);
else
{
as_bad (_("%s offset out of range"), directive);
return;
}
seh_x64_make_prologue_element (code, reg, off);
}
/* Add a stack-allocation token to current context. */
static void
obj_coff_seh_stackalloc (int what ATTRIBUTE_UNUSED)
{
offsetT off;
int code, info;
if (!verify_context_and_target (".seh_stackalloc", seh_kind_x64)
|| !seh_validate_seg (".seh_stackalloc"))
return;
off = get_absolute_expression ();
demand_empty_rest_of_line ();
if (off == 0)
return;
if (off < 0)
{
as_bad (_(".seh_stackalloc offset is negative"));
return;
}
if ((off & 7) == 0 && off <= 128)
code = UWOP_ALLOC_SMALL, info = (off - 8) >> 3, off = 0;
else if ((off & 7) == 0 && off <= (offsetT) (0xffff * 8))
code = UWOP_ALLOC_LARGE, info = 0, off >>= 3;
else if (off <= (offsetT) 0xffffffff)
code = UWOP_ALLOC_LARGE, info = 1;
else
{
as_bad (_(".seh_stackalloc offset out of range"));
return;
}
seh_x64_make_prologue_element (code, info, off);
}
/* Add a frame-pointer token to current context. */
static void
obj_coff_seh_setframe (int what ATTRIBUTE_UNUSED)
{
offsetT off;
int reg;
if (!verify_context_and_target (".seh_setframe", seh_kind_x64)
|| !seh_validate_seg (".seh_setframe"))
return;
reg = seh_x64_read_reg (".seh_setframe", 0);
if (!skip_whitespace_and_comma (1))
return;
off = get_absolute_expression ();
demand_empty_rest_of_line ();
if (reg < 0)
return;
if (off < 0)
as_bad (_(".seh_setframe offset is negative"));
else if (off > 240)
as_bad (_(".seh_setframe offset out of range"));
else if (off & 15)
as_bad (_(".seh_setframe offset not a multiple of 16"));
else if (seh_ctx_cur->framereg != 0)
as_bad (_("duplicate .seh_setframe in current .seh_proc"));
else
{
seh_ctx_cur->framereg = reg;
seh_ctx_cur->frameoff = off;
seh_x64_make_prologue_element (UWOP_SET_FPREG, 0, 0);
}
}
/* Data writing routines. */
/* Output raw integers in 1, 2, or 4 bytes. */
static inline void
out_one (int byte)
{
FRAG_APPEND_1_CHAR (byte);
}
static inline void
out_two (int data)
{
md_number_to_chars (frag_more (2), data, 2);
}
static inline void
out_four (int data)
{
md_number_to_chars (frag_more (4), data, 4);
}
/* Write out prologue data for x64. */
static void
seh_x64_write_prologue_data (const seh_context *c)
{
int i;
/* We have to store in reverse order. */
for (i = c->elems_count - 1; i >= 0; --i)
{
const seh_prologue_element *e = c->elems + i;
expressionS exp;
/* First comes byte offset in code. */
exp.X_op = O_subtract;
exp.X_add_symbol = e->pc_addr;
exp.X_op_symbol = c->start_addr;
exp.X_add_number = 0;
emit_expr (&exp, 1);
/* Second comes code+info packed into a byte. */
out_one ((e->info << 4) | e->code);
switch (e->code)
{
case UWOP_PUSH_NONVOL:
case UWOP_ALLOC_SMALL:
case UWOP_SET_FPREG:
case UWOP_PUSH_MACHFRAME:
/* These have no extra data. */
break;
case UWOP_ALLOC_LARGE:
if (e->info)
{
case UWOP_SAVE_NONVOL_FAR:
case UWOP_SAVE_XMM128_FAR:
/* An unscaled 4 byte offset. */
out_four (e->off);
break;
}
/* FALLTHRU */
case UWOP_SAVE_NONVOL:
case UWOP_SAVE_XMM128:
/* A scaled 2 byte offset. */
out_two (e->off);
break;
default:
abort ();
}
}
}
static int
seh_x64_size_prologue_data (const seh_context *c)
{
int i, ret = 0;
for (i = c->elems_count - 1; i >= 0; --i)
switch (c->elems[i].code)
{
case UWOP_PUSH_NONVOL:
case UWOP_ALLOC_SMALL:
case UWOP_SET_FPREG:
case UWOP_PUSH_MACHFRAME:
ret += 1;
break;
case UWOP_SAVE_NONVOL:
case UWOP_SAVE_XMM128:
ret += 2;
break;
case UWOP_SAVE_NONVOL_FAR:
case UWOP_SAVE_XMM128_FAR:
ret += 3;
break;
case UWOP_ALLOC_LARGE:
ret += (c->elems[i].info ? 3 : 2);
break;
default:
abort ();
}
return ret;
}
/* Write out the xdata information for one function (x64). */
static void
seh_x64_write_function_xdata (seh_context *c)
{
int flags, count_unwind_codes;
expressionS exp;
/* Set 4-byte alignment. */
frag_align (2, 0, 0);
c->xdata_addr = symbol_temp_new_now ();
flags = c->handler_flags;
count_unwind_codes = seh_x64_size_prologue_data (c);
/* ubyte:3 version, ubyte:5 flags. */
out_one ((flags << 3) | 1);
/* Size of prologue. */
if (c->endprologue_addr)
{
exp.X_op = O_subtract;
exp.X_add_symbol = c->endprologue_addr;
exp.X_op_symbol = c->start_addr;
exp.X_add_number = 0;
emit_expr (&exp, 1);
}
else
out_one (0);
/* Number of slots (i.e. shorts) in the unwind codes array. */
if (count_unwind_codes > 255)
as_fatal (_("too much unwind data in this .seh_proc"));
out_one (count_unwind_codes);
/* ubyte:4 frame-reg, ubyte:4 frame-reg-offset. */
/* Note that frameoff is already a multiple of 16, and therefore
the offset is already both scaled and shifted into place. */
out_one (c->frameoff | c->framereg);
seh_x64_write_prologue_data (c);
/* We need to align prologue data. */
if (count_unwind_codes & 1)
out_two (0);
if (flags & (UNW_FLAG_EHANDLER | UNW_FLAG_UHANDLER))
{
/* Force the use of segment-relative relocations instead of absolute
valued expressions. Don't adjust for constants (e.g. NULL). */
if (c->handler.X_op == O_symbol)
c->handler.X_op = O_symbol_rva;
emit_expr (&c->handler, 4);
}
/* Handler data will be tacked in here by subsections. */
}
/* Write out xdata for one function. */
static void
write_function_xdata (seh_context *c)
{
segT save_seg = now_seg;
int save_subseg = now_subseg;
/* MIPS, SH, ARM don't have xdata. */
if (seh_get_target_kind () != seh_kind_x64)
return;
switch_xdata (c->subsection, c->code_seg);
seh_x64_write_function_xdata (c);
subseg_set (save_seg, save_subseg);
}
/* Write pdata section data for one function (arm). */
static void
seh_arm_write_function_pdata (seh_context *c)
{
expressionS exp;
unsigned int prol_len = 0, func_len = 0;
unsigned int val;
/* Start address of the function. */
exp.X_op = O_symbol;
exp.X_add_symbol = c->start_addr;
exp.X_add_number = 0;
emit_expr (&exp, 4);
exp.X_op = O_subtract;
exp.X_add_symbol = c->end_addr;
exp.X_op_symbol = c->start_addr;
exp.X_add_number = 0;
if (resolve_expression (&exp) && exp.X_op == O_constant)
func_len = exp.X_add_number;
else
as_bad (_(".seh_endproc in a different section from .seh_proc"));
if (c->endprologue_addr)
{
exp.X_op = O_subtract;
exp.X_add_symbol = c->endprologue_addr;
exp.X_op_symbol = c->start_addr;
exp.X_add_number = 0;
if (resolve_expression (&exp) && exp.X_op == O_constant)
prol_len = exp.X_add_number;
else
as_bad (_(".seh_endprologue in a different section from .seh_proc"));
}
/* Both function and prologue are in units of instructions. */
func_len >>= (c->use_instruction_32 ? 2 : 1);
prol_len >>= (c->use_instruction_32 ? 2 : 1);
/* Assemble the second word of the pdata. */
val = prol_len & 0xff;
val |= (func_len & 0x3fffff) << 8;
if (c->use_instruction_32)
val |= 0x40000000U;
if (c->handler_written)
val |= 0x80000000U;
out_four (val);
}
/* Write out pdata for one function. */
static void
write_function_pdata (seh_context *c)
{
expressionS exp;
segT save_seg = now_seg;
int save_subseg = now_subseg;
memset (&exp, 0, sizeof (expressionS));
switch_pdata (c->code_seg);
switch (seh_get_target_kind ())
{
case seh_kind_x64:
exp.X_op = O_symbol_rva;
exp.X_add_number = 0;
exp.X_add_symbol = c->start_addr;
emit_expr (&exp, 4);
exp.X_op = O_symbol_rva;
exp.X_add_number = 0;
exp.X_add_symbol = c->end_addr;
emit_expr (&exp, 4);
exp.X_op = O_symbol_rva;
exp.X_add_number = 0;
exp.X_add_symbol = c->xdata_addr;
emit_expr (&exp, 4);
break;
case seh_kind_mips:
exp.X_op = O_symbol;
exp.X_add_number = 0;
exp.X_add_symbol = c->start_addr;
emit_expr (&exp, 4);
exp.X_add_symbol = c->end_addr;
emit_expr (&exp, 4);
emit_expr (&c->handler, 4);
emit_expr (&c->handler_data, 4);
exp.X_add_symbol = (c->endprologue_addr
? c->endprologue_addr
: c->start_addr);
emit_expr (&exp, 4);
break;
case seh_kind_arm:
seh_arm_write_function_pdata (c);
break;
default:
abort ();
}
subseg_set (save_seg, save_subseg);
}