forked from KolibriOS/kolibrios
206 lines
6.5 KiB
C
206 lines
6.5 KiB
C
/* seh pdata/xdata coff object file format
|
|
Copyright 2009, 2010, 2012
|
|
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. */
|
|
|
|
/* Short overview:
|
|
There are at the moment three different function entry formats preset.
|
|
The first is the MIPS one. The second version
|
|
is for ARM, PPC, SH3, and SH4 mainly for Windows CE.
|
|
The third is the IA64 and x64 version. Note, the IA64 isn't implemented yet,
|
|
but to find information about it, please see specification about IA64 on
|
|
http://download.intel.com/design/Itanium/Downloads/245358.pdf file.
|
|
|
|
The first version has just entries in the pdata section: BeginAddress,
|
|
EndAddress, ExceptionHandler, HandlerData, and PrologueEndAddress. Each
|
|
value is a pointer to the corresponding data and has size of 4 bytes.
|
|
|
|
The second variant has the following entries in the pdata section.
|
|
BeginAddress, PrologueLength (8 bits), EndAddress (22 bits),
|
|
Use-32-bit-instruction (1 bit), and Exception-Handler-Exists (1 bit).
|
|
If the FunctionLength is zero, or the Exception-Handler-Exists bit
|
|
is true, a PDATA_EH block is placed directly before function entry.
|
|
|
|
The third version has a function entry block of BeginAddress (RVA),
|
|
EndAddress (RVA), and UnwindData (RVA). The description of the
|
|
prologue, excepetion-handler, and additional SEH data is stored
|
|
within the UNWIND_DATA field in the xdata section.
|
|
|
|
The pseudos:
|
|
.seh_proc <fct_name>
|
|
.seh_endprologue
|
|
.seh_handler <handler>[,@unwind][,@except] (x64)
|
|
.seh_handler <handler>[,<handler_data>] (others)
|
|
.seh_handlerdata
|
|
.seh_eh
|
|
.seh_32/.seh_no32
|
|
.seh_endproc
|
|
.seh_setframe <reg>,<offset>
|
|
.seh_stackalloc
|
|
.seh_pushreg
|
|
.seh_savereg
|
|
.seh_savexmm
|
|
.seh_pushframe
|
|
*/
|
|
|
|
/* architecture specific pdata/xdata handling. */
|
|
#define SEH_CMDS \
|
|
{"seh_proc", obj_coff_seh_proc, 0}, \
|
|
{"seh_endproc", obj_coff_seh_endproc, 0}, \
|
|
{"seh_pushreg", obj_coff_seh_pushreg, 0}, \
|
|
{"seh_savereg", obj_coff_seh_save, 1}, \
|
|
{"seh_savexmm", obj_coff_seh_save, 2}, \
|
|
{"seh_pushframe", obj_coff_seh_pushframe, 0}, \
|
|
{"seh_endprologue", obj_coff_seh_endprologue, 0}, \
|
|
{"seh_setframe", obj_coff_seh_setframe, 0}, \
|
|
{"seh_stackalloc", obj_coff_seh_stackalloc, 0}, \
|
|
{"seh_eh", obj_coff_seh_eh, 0}, \
|
|
{"seh_32", obj_coff_seh_32, 1}, \
|
|
{"seh_no32", obj_coff_seh_32, 0}, \
|
|
{"seh_handler", obj_coff_seh_handler, 0}, \
|
|
{"seh_handlerdata", obj_coff_seh_handlerdata, 0},
|
|
|
|
/* Type definitions. */
|
|
|
|
typedef struct seh_prologue_element
|
|
{
|
|
int code;
|
|
int info;
|
|
offsetT off;
|
|
symbolS *pc_addr;
|
|
} seh_prologue_element;
|
|
|
|
typedef struct seh_context
|
|
{
|
|
struct seh_context *next;
|
|
|
|
/* Initial code-segment. */
|
|
segT code_seg;
|
|
/* Function name. */
|
|
char *func_name;
|
|
/* BeginAddress. */
|
|
symbolS *start_addr;
|
|
/* EndAddress. */
|
|
symbolS *end_addr;
|
|
/* Unwind data. */
|
|
symbolS *xdata_addr;
|
|
/* PrologueEnd. */
|
|
symbolS *endprologue_addr;
|
|
/* ExceptionHandler. */
|
|
expressionS handler;
|
|
/* ExceptionHandlerData. (arm, mips) */
|
|
expressionS handler_data;
|
|
|
|
/* ARM .seh_eh directive seen. */
|
|
int handler_written;
|
|
|
|
/* WinCE specific data. */
|
|
int use_instruction_32;
|
|
/* Was record already processed. */
|
|
int done;
|
|
|
|
/* x64 flags for the xdata header. */
|
|
int handler_flags;
|
|
int subsection;
|
|
|
|
/* x64 framereg and frame offset information. */
|
|
int framereg;
|
|
int frameoff;
|
|
|
|
/* Information about x64 specific unwind data fields. */
|
|
int elems_count;
|
|
int elems_max;
|
|
seh_prologue_element *elems;
|
|
} seh_context;
|
|
|
|
typedef enum seh_kind {
|
|
seh_kind_unknown = 0,
|
|
seh_kind_mips = 1, /* Used for MIPS and x86 pdata generation. */
|
|
seh_kind_arm = 2, /* Used for ARM, PPC, SH3, and SH4 pdata (PDATA_EH) generation. */
|
|
seh_kind_x64 = 3 /* Used for IA64 and x64 pdata/xdata generation. */
|
|
} seh_kind;
|
|
|
|
/* Forward declarations. */
|
|
static void obj_coff_seh_stackalloc (int);
|
|
static void obj_coff_seh_setframe (int);
|
|
static void obj_coff_seh_endprologue (int);
|
|
static void obj_coff_seh_save (int);
|
|
static void obj_coff_seh_pushreg (int);
|
|
static void obj_coff_seh_pushframe (int);
|
|
static void obj_coff_seh_endproc (int);
|
|
static void obj_coff_seh_eh (int);
|
|
static void obj_coff_seh_32 (int);
|
|
static void obj_coff_seh_proc (int);
|
|
static void obj_coff_seh_handler (int);
|
|
static void obj_coff_seh_handlerdata (int);
|
|
|
|
#define UNDSEC bfd_und_section_ptr
|
|
|
|
/* Check if x64 UNW_... macros are already defined. */
|
|
#ifndef PEX64_FLAG_NHANDLER
|
|
/* We can't include here coff/pe.h header. So we have to copy macros
|
|
from coff/pe.h here. */
|
|
#define PEX64_UNWCODE_CODE(VAL) ((VAL) & 0xf)
|
|
#define PEX64_UNWCODE_INFO(VAL) (((VAL) >> 4) & 0xf)
|
|
|
|
/* The unwind info. */
|
|
#define UNW_FLAG_NHANDLER 0
|
|
#define UNW_FLAG_EHANDLER 1
|
|
#define UNW_FLAG_UHANDLER 2
|
|
#define UNW_FLAG_FHANDLER 3
|
|
#define UNW_FLAG_CHAININFO 4
|
|
|
|
#define UNW_FLAG_MASK 0x1f
|
|
|
|
/* The unwind codes. */
|
|
#define UWOP_PUSH_NONVOL 0
|
|
#define UWOP_ALLOC_LARGE 1
|
|
#define UWOP_ALLOC_SMALL 2
|
|
#define UWOP_SET_FPREG 3
|
|
#define UWOP_SAVE_NONVOL 4
|
|
#define UWOP_SAVE_NONVOL_FAR 5
|
|
#define UWOP_SAVE_XMM 6
|
|
#define UWOP_SAVE_XMM_FAR 7
|
|
#define UWOP_SAVE_XMM128 8
|
|
#define UWOP_SAVE_XMM128_FAR 9
|
|
#define UWOP_PUSH_MACHFRAME 10
|
|
|
|
#define PEX64_UWI_VERSION(VAL) ((VAL) & 7)
|
|
#define PEX64_UWI_FLAGS(VAL) (((VAL) >> 3) & 0x1f)
|
|
#define PEX64_UWI_FRAMEREG(VAL) ((VAL) & 0xf)
|
|
#define PEX64_UWI_FRAMEOFF(VAL) (((VAL) >> 4) & 0xf)
|
|
#define PEX64_UWI_SIZEOF_UWCODE_ARRAY(VAL) \
|
|
((((VAL) + 1) & ~1) * 2)
|
|
|
|
#define PEX64_OFFSET_TO_UNWIND_CODE 0x4
|
|
|
|
#define PEX64_OFFSET_TO_HANDLER_RVA (COUNTOFUNWINDCODES) \
|
|
(PEX64_OFFSET_TO_UNWIND_CODE + \
|
|
PEX64_UWI_SIZEOF_UWCODE_ARRAY(COUNTOFUNWINDCODES))
|
|
|
|
#define PEX64_OFFSET_TO_SCOPE_COUNT(COUNTOFUNWINDCODES) \
|
|
(PEX64_OFFSET_TO_HANDLER_RVA(COUNTOFUNWINDCODES) + 4)
|
|
|
|
#define PEX64_SCOPE_ENTRY(COUNTOFUNWINDCODES, IDX) \
|
|
(PEX64_OFFSET_TO_SCOPE_COUNT(COUNTOFUNWINDCODES) + \
|
|
PEX64_SCOPE_ENTRY_SIZE * (IDX))
|
|
|
|
#endif
|
|
|