1062 lines
30 KiB
C
1062 lines
30 KiB
C
/* simple-object-coff.c -- routines to manipulate XCOFF object files.
|
|
Copyright (C) 2013-2022 Free Software Foundation, Inc.
|
|
Written by Ian Lance Taylor, Google and David Edelsohn, IBM.
|
|
|
|
This program 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 2, or (at your option) any
|
|
later version.
|
|
|
|
This program 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 this program; if not, write to the Free Software
|
|
Foundation, 51 Franklin Street - Fifth Floor,
|
|
Boston, MA 02110-1301, USA. */
|
|
|
|
#include "config.h"
|
|
#include "libiberty.h"
|
|
#include "simple-object.h"
|
|
|
|
#include <errno.h>
|
|
#include <stddef.h>
|
|
|
|
#ifdef HAVE_STDLIB_H
|
|
#include <stdlib.h>
|
|
#endif
|
|
|
|
#ifdef HAVE_STDINT_H
|
|
#include <stdint.h>
|
|
#endif
|
|
|
|
#ifdef HAVE_STRING_H
|
|
#include <string.h>
|
|
#endif
|
|
|
|
#ifdef HAVE_INTTYPES_H
|
|
#include <inttypes.h>
|
|
#endif
|
|
|
|
#include "simple-object-common.h"
|
|
|
|
/* XCOFF structures and constants. */
|
|
|
|
/* XCOFF file header. */
|
|
|
|
struct external_filehdr
|
|
{
|
|
unsigned char f_magic[2]; /* magic number */
|
|
unsigned char f_nscns[2]; /* number of sections */
|
|
unsigned char f_timdat[4]; /* time & date stamp */
|
|
union
|
|
{
|
|
struct
|
|
{
|
|
unsigned char f_symptr[4]; /* file pointer to symtab */
|
|
unsigned char f_nsyms[4]; /* number of symtab entries */
|
|
unsigned char f_opthdr[2]; /* sizeof(optional hdr) */
|
|
unsigned char f_flags[2]; /* flags */
|
|
} xcoff32;
|
|
struct
|
|
{
|
|
unsigned char f_symptr[8]; /* file pointer to symtab */
|
|
unsigned char f_opthdr[2]; /* sizeof(optional hdr) */
|
|
unsigned char f_flags[2]; /* flags */
|
|
unsigned char f_nsyms[4]; /* number of symtab entries */
|
|
} xcoff64;
|
|
} u;
|
|
};
|
|
|
|
/* Bits for filehdr f_flags field. */
|
|
|
|
#define F_EXEC (0x0002)
|
|
|
|
/* The known values of f_magic in an XCOFF file header. */
|
|
|
|
#define U802WRMAGIC 0730 /* Writeable text segments. */
|
|
#define U802ROMAGIC 0735 /* Readonly sharable text segments. */
|
|
#define U802TOCMAGIC 0737 /* Readonly text segments and TOC. */
|
|
#define U803XTOCMAGIC 0757 /* Aix 4.3 64-bit XCOFF. */
|
|
#define U64_TOCMAGIC 0767 /* AIX 5+ 64-bit XCOFF. */
|
|
|
|
/* XCOFF section header. */
|
|
|
|
struct external_scnhdr
|
|
{
|
|
unsigned char s_name[8]; /* section name */
|
|
union
|
|
{
|
|
struct
|
|
{
|
|
unsigned char s_paddr[4]; /* physical address, aliased s_nlib */
|
|
unsigned char s_vaddr[4]; /* virtual address */
|
|
unsigned char s_size[4]; /* section size */
|
|
unsigned char s_scnptr[4]; /* file ptr to raw data for section */
|
|
unsigned char s_relptr[4]; /* file ptr to relocation */
|
|
unsigned char s_lnnoptr[4]; /* file ptr to line numbers */
|
|
unsigned char s_nreloc[2]; /* number of relocation entries */
|
|
unsigned char s_nlnno[2]; /* number of line number entries */
|
|
unsigned char s_flags[4]; /* flags */
|
|
} xcoff32;
|
|
struct
|
|
{
|
|
unsigned char s_paddr[8]; /* physical address, aliased s_nlib */
|
|
unsigned char s_vaddr[8]; /* virtual address */
|
|
unsigned char s_size[8]; /* section size */
|
|
unsigned char s_scnptr[8]; /* file ptr to raw data for section */
|
|
unsigned char s_relptr[8]; /* file ptr to relocation */
|
|
unsigned char s_lnnoptr[8]; /* file ptr to line numbers */
|
|
unsigned char s_nreloc[4]; /* number of relocation entries */
|
|
unsigned char s_nlnno[4]; /* number of line number entries */
|
|
unsigned char s_flags[4]; /* flags */
|
|
} xcoff64;
|
|
} u;
|
|
};
|
|
|
|
#define SCNHSZ32 (40)
|
|
#define SCNHSZ64 (68)
|
|
|
|
/* The length of the s_name field in struct external_scnhdr. */
|
|
|
|
#define SCNNMLEN (8)
|
|
|
|
/* Bits for scnhdr s_flags field. */
|
|
|
|
#define STYP_DATA 0x40
|
|
|
|
/* XCOFF symbol table entry. */
|
|
|
|
|
|
#define N_SYMNMLEN (8) /* # characters in a symbol name */
|
|
|
|
/* The format of an XCOFF symbol-table entry. */
|
|
struct external_syment
|
|
{
|
|
union {
|
|
struct {
|
|
union {
|
|
/* The name of the symbol. There is an implicit null character
|
|
after the end of the array. */
|
|
char n_name[N_SYMNMLEN];
|
|
struct {
|
|
/* If n_zeroes is zero, n_offset is the offset the name from
|
|
the start of the string table. */
|
|
unsigned char n_zeroes[4];
|
|
unsigned char n_offset[4];
|
|
} n;
|
|
} n;
|
|
|
|
/* The symbol's value. */
|
|
unsigned char n_value[4];
|
|
} xcoff32;
|
|
struct {
|
|
/* The symbol's value. */
|
|
unsigned char n_value[8];
|
|
|
|
/* The offset of the symbol from the start of the string table. */
|
|
unsigned char n_offset[4];
|
|
} xcoff64;
|
|
} u;
|
|
|
|
/* The number of the section to which this symbol belongs. */
|
|
unsigned char n_scnum[2];
|
|
|
|
/* The type of symbol. (It can be interpreted as an n_lang
|
|
and an n_cpu byte, but we don't care about that here.) */
|
|
unsigned char n_type[2];
|
|
|
|
/* The class of symbol (a C_* value). */
|
|
unsigned char n_sclass[1];
|
|
|
|
/* The number of auxiliary symbols attached to this entry. */
|
|
unsigned char n_numaux[1];
|
|
};
|
|
|
|
#define SYMESZ (18)
|
|
|
|
/* Length allowed for filename in aux sym format 4. */
|
|
|
|
#define FILNMLEN (14)
|
|
|
|
/* Omits x_sym and other unused variants. */
|
|
|
|
union external_auxent
|
|
{
|
|
/* Aux sym format 4: file. */
|
|
union
|
|
{
|
|
char x_fname[FILNMLEN];
|
|
struct
|
|
{
|
|
unsigned char x_zeroes[4];
|
|
unsigned char x_offset[4];
|
|
unsigned char x_pad[FILNMLEN-8];
|
|
unsigned char x_ftype;
|
|
} _x;
|
|
} x_file;
|
|
/* Aux sym format 5: section. */
|
|
struct
|
|
{
|
|
unsigned char x_scnlen[4]; /* section length */
|
|
unsigned char x_nreloc[2]; /* # relocation entries */
|
|
unsigned char x_nlinno[2]; /* # line numbers */
|
|
} x_scn;
|
|
/* CSECT auxiliary entry. */
|
|
union
|
|
{
|
|
struct
|
|
{
|
|
struct
|
|
{
|
|
unsigned char x_scnlen[4]; /* csect length */
|
|
unsigned char x_parmhash[4]; /* parm type hash index */
|
|
unsigned char x_snhash[2]; /* sect num with parm hash */
|
|
unsigned char x_smtyp; /* symbol align and type */
|
|
unsigned char x_smclas; /* storage mapping class */
|
|
unsigned char x_stab; /* dbx stab info index */
|
|
unsigned char x_snstab[2]; /* sect num with dbx stab */
|
|
} x_csect;
|
|
} xcoff32;
|
|
struct
|
|
{
|
|
struct
|
|
{
|
|
unsigned char x_scnlen_lo[4]; /* csect length */
|
|
unsigned char x_parmhash[4]; /* parm type hash index */
|
|
unsigned char x_snhash[2]; /* sect num with parm hash */
|
|
unsigned char x_smtyp; /* symbol align and type */
|
|
unsigned char x_smclas; /* storage mapping class */
|
|
unsigned char x_scnlen_hi[4];
|
|
unsigned char pad;
|
|
unsigned char x_auxtype;
|
|
} x_csect;
|
|
} xcoff64;
|
|
} u;
|
|
/* SECTION/DWARF auxiliary entry. */
|
|
struct
|
|
{
|
|
unsigned char x_scnlen[4]; /* section length */
|
|
unsigned char pad1[4];
|
|
unsigned char x_nreloc[4]; /* number RLDs */
|
|
} x_sect;
|
|
};
|
|
|
|
/* Symbol-related constants. */
|
|
|
|
#define N_DEBUG (-2)
|
|
#define IMAGE_SYM_TYPE_NULL (0)
|
|
#define IMAGE_SYM_DTYPE_NULL (0)
|
|
#define IMAGE_SYM_CLASS_STATIC (3)
|
|
#define IMAGE_SYM_CLASS_FILE (103)
|
|
|
|
#define IMAGE_SYM_TYPE \
|
|
((IMAGE_SYM_DTYPE_NULL << 4) | IMAGE_SYM_TYPE_NULL)
|
|
|
|
#define C_EXT (2)
|
|
#define C_STAT (3)
|
|
#define C_FILE (103)
|
|
#define C_HIDEXT (107)
|
|
|
|
#define XTY_SD (1) /* section definition */
|
|
|
|
#define XMC_XO (7) /* extended operation */
|
|
|
|
/* Private data for an simple_object_read. */
|
|
|
|
struct simple_object_xcoff_read
|
|
{
|
|
/* Magic number. */
|
|
unsigned short magic;
|
|
/* Number of sections. */
|
|
unsigned short nscns;
|
|
/* File offset of symbol table. */
|
|
off_t symptr;
|
|
/* Number of symbol table entries. */
|
|
unsigned int nsyms;
|
|
/* Flags. */
|
|
unsigned short flags;
|
|
/* Offset of section headers in file. */
|
|
off_t scnhdr_offset;
|
|
};
|
|
|
|
/* Private data for an simple_object_attributes. */
|
|
|
|
struct simple_object_xcoff_attributes
|
|
{
|
|
/* Magic number. */
|
|
unsigned short magic;
|
|
/* Flags. */
|
|
unsigned short flags;
|
|
};
|
|
|
|
/* See if we have a XCOFF file. */
|
|
|
|
static void *
|
|
simple_object_xcoff_match (unsigned char header[SIMPLE_OBJECT_MATCH_HEADER_LEN],
|
|
int descriptor, off_t offset,
|
|
const char *segment_name ATTRIBUTE_UNUSED,
|
|
const char **errmsg, int *err)
|
|
{
|
|
unsigned short magic;
|
|
unsigned short (*fetch_16) (const unsigned char *);
|
|
unsigned int (*fetch_32) (const unsigned char *);
|
|
ulong_type (*fetch_64) (const unsigned char *);
|
|
unsigned char hdrbuf[sizeof (struct external_filehdr)];
|
|
struct simple_object_xcoff_read *ocr;
|
|
int u64;
|
|
|
|
magic = simple_object_fetch_big_16 (header);
|
|
|
|
if (magic != U802TOCMAGIC && magic != U64_TOCMAGIC)
|
|
{
|
|
*errmsg = NULL;
|
|
*err = 0;
|
|
return NULL;
|
|
}
|
|
|
|
fetch_16 = simple_object_fetch_big_16;
|
|
fetch_32 = simple_object_fetch_big_32;
|
|
fetch_64 = simple_object_fetch_big_64;
|
|
|
|
if (!simple_object_internal_read (descriptor, offset, hdrbuf, sizeof hdrbuf,
|
|
errmsg, err))
|
|
return NULL;
|
|
|
|
u64 = magic == U64_TOCMAGIC;
|
|
|
|
ocr = XNEW (struct simple_object_xcoff_read);
|
|
ocr->magic = magic;
|
|
ocr->nscns = fetch_16 (hdrbuf + offsetof (struct external_filehdr, f_nscns));
|
|
if (u64)
|
|
{
|
|
ocr->symptr = fetch_64 (hdrbuf
|
|
+ offsetof (struct external_filehdr,
|
|
u.xcoff64.f_symptr));
|
|
ocr->nsyms = fetch_32 (hdrbuf + offsetof (struct external_filehdr,
|
|
u.xcoff64.f_nsyms));
|
|
ocr->scnhdr_offset = (sizeof (struct external_filehdr)
|
|
+ fetch_16 (hdrbuf + offsetof (struct external_filehdr,
|
|
u.xcoff64.f_opthdr)));
|
|
|
|
}
|
|
else
|
|
{
|
|
ocr->symptr = fetch_32 (hdrbuf
|
|
+ offsetof (struct external_filehdr,
|
|
u.xcoff32.f_symptr));
|
|
ocr->nsyms = fetch_32 (hdrbuf + offsetof (struct external_filehdr,
|
|
u.xcoff32.f_nsyms));
|
|
ocr->scnhdr_offset = (sizeof (struct external_filehdr) - 4
|
|
+ fetch_16 (hdrbuf + offsetof (struct external_filehdr,
|
|
u.xcoff32.f_opthdr)));
|
|
|
|
}
|
|
|
|
return (void *) ocr;
|
|
}
|
|
|
|
/* Read the string table in a XCOFF file. */
|
|
|
|
static char *
|
|
simple_object_xcoff_read_strtab (simple_object_read *sobj, size_t *strtab_size,
|
|
const char **errmsg, int *err)
|
|
{
|
|
struct simple_object_xcoff_read *ocr =
|
|
(struct simple_object_xcoff_read *) sobj->data;
|
|
off_t strtab_offset;
|
|
unsigned char strsizebuf[4];
|
|
size_t strsize;
|
|
char *strtab;
|
|
|
|
strtab_offset = sobj->offset + ocr->symptr
|
|
+ ocr->nsyms * SYMESZ;
|
|
if (!simple_object_internal_read (sobj->descriptor, strtab_offset,
|
|
strsizebuf, 4, errmsg, err))
|
|
return NULL;
|
|
strsize = simple_object_fetch_big_32 (strsizebuf);
|
|
strtab = XNEWVEC (char, strsize);
|
|
if (!simple_object_internal_read (sobj->descriptor, strtab_offset,
|
|
(unsigned char *) strtab, strsize, errmsg,
|
|
err))
|
|
{
|
|
XDELETEVEC (strtab);
|
|
return NULL;
|
|
}
|
|
*strtab_size = strsize;
|
|
return strtab;
|
|
}
|
|
|
|
/* Find all sections in a XCOFF file. */
|
|
|
|
static const char *
|
|
simple_object_xcoff_find_sections (simple_object_read *sobj,
|
|
int (*pfn) (void *, const char *,
|
|
off_t offset, off_t length),
|
|
void *data,
|
|
int *err)
|
|
{
|
|
struct simple_object_xcoff_read *ocr =
|
|
(struct simple_object_xcoff_read *) sobj->data;
|
|
int u64 = ocr->magic == U64_TOCMAGIC;
|
|
size_t scnhdr_size;
|
|
unsigned char *scnbuf;
|
|
const char *errmsg;
|
|
unsigned short (*fetch_16) (const unsigned char *);
|
|
unsigned int (*fetch_32) (const unsigned char *);
|
|
ulong_type (*fetch_64) (const unsigned char *);
|
|
unsigned int nscns;
|
|
char *strtab;
|
|
size_t strtab_size;
|
|
struct external_syment *symtab = NULL;
|
|
unsigned int i;
|
|
|
|
scnhdr_size = u64 ? SCNHSZ64 : SCNHSZ32;
|
|
scnbuf = XNEWVEC (unsigned char, scnhdr_size * ocr->nscns);
|
|
if (!simple_object_internal_read (sobj->descriptor,
|
|
sobj->offset + ocr->scnhdr_offset,
|
|
scnbuf, scnhdr_size * ocr->nscns, &errmsg,
|
|
err))
|
|
{
|
|
XDELETEVEC (scnbuf);
|
|
return errmsg;
|
|
}
|
|
|
|
fetch_16 = simple_object_fetch_big_16;
|
|
fetch_32 = simple_object_fetch_big_32;
|
|
fetch_64 = simple_object_fetch_big_64;
|
|
|
|
nscns = ocr->nscns;
|
|
strtab = NULL;
|
|
strtab_size = 0;
|
|
for (i = 0; i < nscns; ++i)
|
|
{
|
|
unsigned char *scnhdr;
|
|
unsigned char *scnname;
|
|
char namebuf[SCNNMLEN + 1];
|
|
char *name;
|
|
off_t scnptr;
|
|
off_t size;
|
|
|
|
scnhdr = scnbuf + i * scnhdr_size;
|
|
scnname = scnhdr + offsetof (struct external_scnhdr, s_name);
|
|
memcpy (namebuf, scnname, SCNNMLEN);
|
|
namebuf[SCNNMLEN] = '\0';
|
|
name = &namebuf[0];
|
|
if (namebuf[0] == '/')
|
|
{
|
|
size_t strindex;
|
|
char *end;
|
|
|
|
strindex = strtol (namebuf + 1, &end, 10);
|
|
if (*end == '\0')
|
|
{
|
|
/* The real section name is found in the string
|
|
table. */
|
|
if (strtab == NULL)
|
|
{
|
|
strtab = simple_object_xcoff_read_strtab (sobj,
|
|
&strtab_size,
|
|
&errmsg, err);
|
|
if (strtab == NULL)
|
|
{
|
|
XDELETEVEC (scnbuf);
|
|
return errmsg;
|
|
}
|
|
}
|
|
|
|
if (strindex < 4 || strindex >= strtab_size)
|
|
{
|
|
XDELETEVEC (strtab);
|
|
XDELETEVEC (scnbuf);
|
|
*err = 0;
|
|
return "section string index out of range";
|
|
}
|
|
|
|
name = strtab + strindex;
|
|
}
|
|
}
|
|
|
|
if (u64)
|
|
{
|
|
scnptr = fetch_64 (scnhdr + offsetof (struct external_scnhdr,
|
|
u.xcoff64.s_scnptr));
|
|
size = fetch_64 (scnhdr + offsetof (struct external_scnhdr,
|
|
u.xcoff64.s_size));
|
|
}
|
|
else
|
|
{
|
|
scnptr = fetch_32 (scnhdr + offsetof (struct external_scnhdr,
|
|
u.xcoff32.s_scnptr));
|
|
size = fetch_32 (scnhdr + offsetof (struct external_scnhdr,
|
|
u.xcoff32.s_size));
|
|
}
|
|
|
|
if (!(*pfn) (data, name, scnptr, size))
|
|
break;
|
|
}
|
|
|
|
/* Special handling for .go_export csect. */
|
|
if (ocr->nsyms > 0)
|
|
{
|
|
unsigned char *sym;
|
|
const char *n_name;
|
|
off_t size, n_value;
|
|
unsigned int n_numaux, n_offset, n_zeroes;
|
|
short n_scnum;
|
|
|
|
/* Read symbol table. */
|
|
symtab = XNEWVEC (struct external_syment, ocr->nsyms * SYMESZ);
|
|
if (!simple_object_internal_read (sobj->descriptor,
|
|
sobj->offset + ocr->symptr,
|
|
(unsigned char *) symtab,
|
|
ocr->nsyms * SYMESZ,
|
|
&errmsg, err))
|
|
{
|
|
XDELETEVEC (symtab);
|
|
XDELETEVEC (scnbuf);
|
|
return NULL;
|
|
}
|
|
|
|
/* Search in symbol table if we have a ".go_export" symbol. */
|
|
for (i = 0; i < ocr->nsyms; i += n_numaux + 1)
|
|
{
|
|
sym = (unsigned char *) &symtab[i];
|
|
n_numaux = symtab[i].n_numaux[0];
|
|
|
|
if (symtab[i].n_sclass[0] != C_EXT
|
|
&& symtab[i].n_sclass[0] != C_HIDEXT)
|
|
continue;
|
|
|
|
/* Must have at least one csect auxiliary entry. */
|
|
if (n_numaux < 1 || i + n_numaux >= ocr->nsyms)
|
|
continue;
|
|
|
|
n_scnum = fetch_16 (sym + offsetof (struct external_syment,
|
|
n_scnum));
|
|
if (n_scnum < 1 || (unsigned int) n_scnum > nscns)
|
|
continue;
|
|
|
|
if (u64)
|
|
{
|
|
n_value = fetch_64 (sym + offsetof (struct external_syment,
|
|
u.xcoff64.n_value));
|
|
n_offset = fetch_32 (sym + offsetof (struct external_syment,
|
|
u.xcoff64.n_offset));
|
|
}
|
|
else
|
|
{
|
|
/* ".go_export" is longer than N_SYMNMLEN. */
|
|
n_zeroes = fetch_32 (sym + offsetof (struct external_syment,
|
|
u.xcoff32.n.n.n_zeroes));
|
|
if (n_zeroes != 0)
|
|
continue;
|
|
|
|
n_value = fetch_32 (sym + offsetof (struct external_syment,
|
|
u.xcoff32.n_value));
|
|
n_offset = fetch_32 (sym + offsetof (struct external_syment,
|
|
u.xcoff32.n.n.n_offset));
|
|
}
|
|
|
|
/* The real symbol name is found in the string table. */
|
|
if (strtab == NULL)
|
|
{
|
|
strtab = simple_object_xcoff_read_strtab (sobj,
|
|
&strtab_size,
|
|
&errmsg, err);
|
|
if (strtab == NULL)
|
|
{
|
|
XDELETEVEC (symtab);
|
|
XDELETEVEC (scnbuf);
|
|
return errmsg;
|
|
}
|
|
}
|
|
|
|
if (n_offset >= strtab_size)
|
|
{
|
|
XDELETEVEC (strtab);
|
|
XDELETEVEC (symtab);
|
|
XDELETEVEC (scnbuf);
|
|
*err = 0;
|
|
return "symbol string index out of range";
|
|
}
|
|
n_name = strtab + n_offset;
|
|
|
|
if (!strcmp (n_name, ".go_export"))
|
|
{
|
|
union external_auxent *auxent;
|
|
unsigned char *aux, *scnhdr;
|
|
off_t scnptr, x_scnlen;
|
|
|
|
/* Found .go_export symbol, read its csect auxiliary entry.
|
|
By convention, it is the last auxiliary entry. */
|
|
auxent = (union external_auxent *) &symtab[i + n_numaux];
|
|
aux = (unsigned char *) auxent;
|
|
if (u64)
|
|
{
|
|
/* Use an intermediate 64-bit type to avoid
|
|
compilation warning about 32-bit shift below on
|
|
hosts with 32-bit off_t which aren't supported by
|
|
AC_SYS_LARGEFILE. */
|
|
ulong_type x_scnlen64;
|
|
|
|
if ((auxent->u.xcoff64.x_csect.x_smtyp & 0x7) != XTY_SD
|
|
|| auxent->u.xcoff64.x_csect.x_smclas != XMC_XO)
|
|
continue;
|
|
|
|
x_scnlen64 =
|
|
fetch_32 (aux + offsetof (union external_auxent,
|
|
u.xcoff64.x_csect.x_scnlen_hi));
|
|
x_scnlen =
|
|
((x_scnlen64 << 32)
|
|
| fetch_32 (aux
|
|
+ offsetof (union external_auxent,
|
|
u.xcoff64.x_csect.x_scnlen_lo)));
|
|
}
|
|
else
|
|
{
|
|
if ((auxent->u.xcoff32.x_csect.x_smtyp & 0x7) != XTY_SD
|
|
|| auxent->u.xcoff32.x_csect.x_smclas != XMC_XO)
|
|
continue;
|
|
|
|
x_scnlen = fetch_32 (aux + offsetof (union external_auxent,
|
|
u.xcoff32.x_csect.x_scnlen));
|
|
}
|
|
|
|
/* Get header of containing section. */
|
|
scnhdr = scnbuf + (n_scnum - 1) * scnhdr_size;
|
|
if (u64)
|
|
{
|
|
scnptr = fetch_64 (scnhdr + offsetof (struct external_scnhdr,
|
|
u.xcoff64.s_scnptr));
|
|
size = fetch_64 (scnhdr + offsetof (struct external_scnhdr,
|
|
u.xcoff64.s_size));
|
|
}
|
|
else
|
|
{
|
|
scnptr = fetch_32 (scnhdr + offsetof (struct external_scnhdr,
|
|
u.xcoff32.s_scnptr));
|
|
size = fetch_32 (scnhdr + offsetof (struct external_scnhdr,
|
|
u.xcoff32.s_size));
|
|
}
|
|
if (n_value + x_scnlen > size)
|
|
break;
|
|
|
|
(*pfn) (data, ".go_export", scnptr + n_value, x_scnlen);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (symtab != NULL)
|
|
XDELETEVEC (symtab);
|
|
if (strtab != NULL)
|
|
XDELETEVEC (strtab);
|
|
XDELETEVEC (scnbuf);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/* Fetch the attributes for an simple_object_read. */
|
|
|
|
static void *
|
|
simple_object_xcoff_fetch_attributes (simple_object_read *sobj,
|
|
const char **errmsg ATTRIBUTE_UNUSED,
|
|
int *err ATTRIBUTE_UNUSED)
|
|
{
|
|
struct simple_object_xcoff_read *ocr =
|
|
(struct simple_object_xcoff_read *) sobj->data;
|
|
struct simple_object_xcoff_attributes *ret;
|
|
|
|
ret = XNEW (struct simple_object_xcoff_attributes);
|
|
ret->magic = ocr->magic;
|
|
ret->flags = ocr->flags;
|
|
return ret;
|
|
}
|
|
|
|
/* Release the private data for an simple_object_read. */
|
|
|
|
static void
|
|
simple_object_xcoff_release_read (void *data)
|
|
{
|
|
XDELETE (data);
|
|
}
|
|
|
|
/* Compare two attributes structures. */
|
|
|
|
static const char *
|
|
simple_object_xcoff_attributes_merge (void *todata, void *fromdata, int *err)
|
|
{
|
|
struct simple_object_xcoff_attributes *to =
|
|
(struct simple_object_xcoff_attributes *) todata;
|
|
struct simple_object_xcoff_attributes *from =
|
|
(struct simple_object_xcoff_attributes *) fromdata;
|
|
|
|
if (to->magic != from->magic)
|
|
{
|
|
*err = 0;
|
|
return "XCOFF object format mismatch";
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/* Release the private data for an attributes structure. */
|
|
|
|
static void
|
|
simple_object_xcoff_release_attributes (void *data)
|
|
{
|
|
XDELETE (data);
|
|
}
|
|
|
|
/* Prepare to write out a file. */
|
|
|
|
static void *
|
|
simple_object_xcoff_start_write (void *attributes_data,
|
|
const char **errmsg ATTRIBUTE_UNUSED,
|
|
int *err ATTRIBUTE_UNUSED)
|
|
{
|
|
struct simple_object_xcoff_attributes *attrs =
|
|
(struct simple_object_xcoff_attributes *) attributes_data;
|
|
struct simple_object_xcoff_attributes *ret;
|
|
|
|
/* We're just going to record the attributes, but we need to make a
|
|
copy because the user may delete them. */
|
|
ret = XNEW (struct simple_object_xcoff_attributes);
|
|
*ret = *attrs;
|
|
return ret;
|
|
}
|
|
|
|
/* Write out a XCOFF filehdr. */
|
|
|
|
static int
|
|
simple_object_xcoff_write_filehdr (simple_object_write *sobj, int descriptor,
|
|
unsigned int nscns, size_t symtab_offset,
|
|
unsigned int nsyms, const char **errmsg,
|
|
int *err)
|
|
{
|
|
struct simple_object_xcoff_attributes *attrs =
|
|
(struct simple_object_xcoff_attributes *) sobj->data;
|
|
int u64 = attrs->magic == U64_TOCMAGIC;
|
|
unsigned char hdrbuf[sizeof (struct external_filehdr)];
|
|
unsigned char *hdr;
|
|
void (*set_16) (unsigned char *, unsigned short);
|
|
void (*set_32) (unsigned char *, unsigned int);
|
|
void (*set_64) (unsigned char *, ulong_type);
|
|
|
|
hdr = &hdrbuf[0];
|
|
|
|
set_16 = simple_object_set_big_16;
|
|
set_32 = simple_object_set_big_32;
|
|
set_64 = simple_object_set_big_64;
|
|
|
|
memset (hdr, 0, sizeof (struct external_filehdr));
|
|
|
|
set_16 (hdr + offsetof (struct external_filehdr, f_magic), attrs->magic);
|
|
set_16 (hdr + offsetof (struct external_filehdr, f_nscns), nscns);
|
|
/* f_timdat left as zero. */
|
|
if (u64)
|
|
{
|
|
set_64 (hdr + offsetof (struct external_filehdr, u.xcoff64.f_symptr),
|
|
symtab_offset);
|
|
set_32 (hdr + offsetof (struct external_filehdr, u.xcoff64.f_nsyms),
|
|
nsyms);
|
|
/* f_opthdr left as zero. */
|
|
set_16 (hdr + offsetof (struct external_filehdr, u.xcoff64.f_flags),
|
|
attrs->flags);
|
|
}
|
|
else
|
|
{
|
|
set_32 (hdr + offsetof (struct external_filehdr, u.xcoff64.f_symptr),
|
|
symtab_offset);
|
|
set_32 (hdr + offsetof (struct external_filehdr, u.xcoff64.f_nsyms),
|
|
nsyms);
|
|
/* f_opthdr left as zero. */
|
|
set_16 (hdr + offsetof (struct external_filehdr, u.xcoff64.f_flags),
|
|
attrs->flags);
|
|
}
|
|
|
|
return simple_object_internal_write (descriptor, 0, hdrbuf,
|
|
sizeof (struct external_filehdr),
|
|
errmsg, err);
|
|
}
|
|
|
|
/* Write out a XCOFF section header. */
|
|
|
|
static int
|
|
simple_object_xcoff_write_scnhdr (simple_object_write *sobj,
|
|
int descriptor,
|
|
const char *name, size_t *name_offset,
|
|
off_t scnhdr_offset, size_t scnsize,
|
|
off_t offset, unsigned int align,
|
|
const char **errmsg, int *err)
|
|
{
|
|
struct simple_object_xcoff_read *ocr =
|
|
(struct simple_object_xcoff_read *) sobj->data;
|
|
int u64 = ocr->magic == U64_TOCMAGIC;
|
|
void (*set_32) (unsigned char *, unsigned int);
|
|
void (*set_64) (unsigned char *, unsigned int);
|
|
unsigned char hdrbuf[sizeof (struct external_scnhdr)];
|
|
unsigned char *hdr;
|
|
size_t namelen;
|
|
unsigned int flags;
|
|
|
|
set_32 = simple_object_set_big_32;
|
|
set_64 = simple_object_set_big_32;
|
|
|
|
memset (hdrbuf, 0, sizeof hdrbuf);
|
|
hdr = &hdrbuf[0];
|
|
|
|
namelen = strlen (name);
|
|
if (namelen <= SCNNMLEN)
|
|
strncpy ((char *) hdr + offsetof (struct external_scnhdr, s_name),
|
|
name, SCNNMLEN);
|
|
else
|
|
{
|
|
snprintf ((char *) hdr + offsetof (struct external_scnhdr, s_name),
|
|
SCNNMLEN, "/%lu", (unsigned long) *name_offset);
|
|
*name_offset += namelen + 1;
|
|
}
|
|
|
|
/* s_paddr left as zero. */
|
|
/* s_vaddr left as zero. */
|
|
if (u64)
|
|
{
|
|
set_64 (hdr + offsetof (struct external_scnhdr, u.xcoff64.s_size),
|
|
scnsize);
|
|
set_64 (hdr + offsetof (struct external_scnhdr, u.xcoff64.s_scnptr),
|
|
offset);
|
|
}
|
|
else
|
|
{
|
|
set_32 (hdr + offsetof (struct external_scnhdr, u.xcoff32.s_size),
|
|
scnsize);
|
|
set_32 (hdr + offsetof (struct external_scnhdr, u.xcoff32.s_scnptr),
|
|
offset);
|
|
}
|
|
/* s_relptr left as zero. */
|
|
/* s_lnnoptr left as zero. */
|
|
/* s_nreloc left as zero. */
|
|
/* s_nlnno left as zero. */
|
|
flags = STYP_DATA;
|
|
if (align > 13)
|
|
align = 13;
|
|
if (u64)
|
|
set_32 (hdr + offsetof (struct external_scnhdr, u.xcoff64.s_flags), flags);
|
|
else
|
|
set_32 (hdr + offsetof (struct external_scnhdr, u.xcoff32.s_flags), flags);
|
|
|
|
return simple_object_internal_write (descriptor, scnhdr_offset, hdrbuf,
|
|
u64 ? SCNHSZ64 : SCNHSZ32,
|
|
errmsg, err);
|
|
}
|
|
|
|
/* Write out a complete XCOFF file. */
|
|
|
|
static const char *
|
|
simple_object_xcoff_write_to_file (simple_object_write *sobj, int descriptor,
|
|
int *err)
|
|
{
|
|
struct simple_object_xcoff_read *ocr =
|
|
(struct simple_object_xcoff_read *) sobj->data;
|
|
int u64 = ocr->magic == U64_TOCMAGIC;
|
|
unsigned int nscns, secnum;
|
|
simple_object_write_section *section;
|
|
off_t scnhdr_offset;
|
|
size_t symtab_offset;
|
|
off_t secsym_offset;
|
|
unsigned int nsyms;
|
|
size_t offset;
|
|
size_t name_offset;
|
|
const char *errmsg;
|
|
unsigned char strsizebuf[4];
|
|
/* The interface doesn't give us access to the name of the input file
|
|
yet. We want to use its basename for the FILE symbol. This is
|
|
what 'gas' uses when told to assemble from stdin. */
|
|
const char *source_filename = "fake";
|
|
size_t sflen;
|
|
union
|
|
{
|
|
struct external_syment sym;
|
|
union external_auxent aux;
|
|
} syms[2];
|
|
void (*set_16) (unsigned char *, unsigned short);
|
|
void (*set_32) (unsigned char *, unsigned int);
|
|
|
|
set_16 = simple_object_set_big_16;
|
|
set_32 = simple_object_set_big_32;
|
|
|
|
nscns = 0;
|
|
for (section = sobj->sections; section != NULL; section = section->next)
|
|
++nscns;
|
|
|
|
scnhdr_offset = sizeof (struct external_filehdr) - (u64 ? 4 : 0);
|
|
offset = scnhdr_offset + nscns * (u64 ? SCNHSZ64 : SCNHSZ32);
|
|
name_offset = 4;
|
|
for (section = sobj->sections; section != NULL; section = section->next)
|
|
{
|
|
size_t mask;
|
|
size_t new_offset;
|
|
size_t scnsize;
|
|
struct simple_object_write_section_buffer *buffer;
|
|
|
|
mask = (1U << section->align) - 1;
|
|
new_offset = offset & mask;
|
|
new_offset &= ~ mask;
|
|
while (new_offset > offset)
|
|
{
|
|
unsigned char zeroes[16];
|
|
size_t write;
|
|
|
|
memset (zeroes, 0, sizeof zeroes);
|
|
write = new_offset - offset;
|
|
if (write > sizeof zeroes)
|
|
write = sizeof zeroes;
|
|
if (!simple_object_internal_write (descriptor, offset, zeroes, write,
|
|
&errmsg, err))
|
|
return errmsg;
|
|
}
|
|
|
|
scnsize = 0;
|
|
for (buffer = section->buffers; buffer != NULL; buffer = buffer->next)
|
|
{
|
|
if (!simple_object_internal_write (descriptor, offset + scnsize,
|
|
((const unsigned char *)
|
|
buffer->buffer),
|
|
buffer->size, &errmsg, err))
|
|
return errmsg;
|
|
scnsize += buffer->size;
|
|
}
|
|
|
|
if (!simple_object_xcoff_write_scnhdr (sobj, descriptor, section->name,
|
|
&name_offset, scnhdr_offset,
|
|
scnsize, offset, section->align,
|
|
&errmsg, err))
|
|
return errmsg;
|
|
|
|
scnhdr_offset += u64 ? SCNHSZ64 : SCNHSZ32;
|
|
offset += scnsize;
|
|
}
|
|
|
|
/* Symbol table is always half-word aligned. */
|
|
offset += (offset & 1);
|
|
/* There is a file symbol and a section symbol per section,
|
|
and each of these has a single auxiliary symbol following. */
|
|
nsyms = 2 * (nscns + 1);
|
|
symtab_offset = offset;
|
|
/* Advance across space reserved for symbol table to locate
|
|
start of string table. */
|
|
offset += nsyms * SYMESZ;
|
|
|
|
/* Write out file symbol. */
|
|
memset (&syms[0], 0, sizeof (syms));
|
|
if (!u64)
|
|
strcpy ((char *)&syms[0].sym.u.xcoff32.n.n_name[0], ".file");
|
|
set_16 (&syms[0].sym.n_scnum[0], N_DEBUG);
|
|
set_16 (&syms[0].sym.n_type[0], IMAGE_SYM_TYPE);
|
|
syms[0].sym.n_sclass[0] = C_FILE;
|
|
syms[0].sym.n_numaux[0] = 1;
|
|
/* The name need not be nul-terminated if it fits into the x_fname field
|
|
directly, but must be if it has to be placed into the string table. */
|
|
sflen = strlen (source_filename);
|
|
if (sflen <= FILNMLEN)
|
|
memcpy (&syms[1].aux.x_file.x_fname[0], source_filename, sflen);
|
|
else
|
|
{
|
|
set_32 (&syms[1].aux.x_file._x.x_offset[0], name_offset);
|
|
if (!simple_object_internal_write (descriptor, offset + name_offset,
|
|
((const unsigned char *)
|
|
source_filename),
|
|
sflen + 1, &errmsg, err))
|
|
return errmsg;
|
|
name_offset += strlen (source_filename) + 1;
|
|
}
|
|
if (!simple_object_internal_write (descriptor, symtab_offset,
|
|
(const unsigned char *) &syms[0],
|
|
sizeof (syms), &errmsg, err))
|
|
return errmsg;
|
|
|
|
/* Write the string table length, followed by the strings and section
|
|
symbols in step with each other. */
|
|
set_32 (strsizebuf, name_offset);
|
|
if (!simple_object_internal_write (descriptor, offset, strsizebuf, 4,
|
|
&errmsg, err))
|
|
return errmsg;
|
|
|
|
name_offset = 4;
|
|
secsym_offset = symtab_offset + sizeof (syms);
|
|
memset (&syms[0], 0, sizeof (syms));
|
|
set_16 (&syms[0].sym.n_type[0], IMAGE_SYM_TYPE);
|
|
syms[0].sym.n_sclass[0] = C_STAT;
|
|
syms[0].sym.n_numaux[0] = 1;
|
|
secnum = 1;
|
|
|
|
for (section = sobj->sections; section != NULL; section = section->next)
|
|
{
|
|
size_t namelen;
|
|
size_t scnsize;
|
|
struct simple_object_write_section_buffer *buffer;
|
|
|
|
namelen = strlen (section->name);
|
|
set_16 (&syms[0].sym.n_scnum[0], secnum++);
|
|
scnsize = 0;
|
|
for (buffer = section->buffers; buffer != NULL; buffer = buffer->next)
|
|
scnsize += buffer->size;
|
|
set_32 (&syms[1].aux.x_scn.x_scnlen[0], scnsize);
|
|
if (namelen > SCNNMLEN)
|
|
{
|
|
set_32 (&syms[0].sym.u.xcoff32.n.n.n_zeroes[0], 0);
|
|
set_32 (&syms[0].sym.u.xcoff32.n.n.n_offset[0], name_offset);
|
|
if (!simple_object_internal_write (descriptor, offset + name_offset,
|
|
((const unsigned char *)
|
|
section->name),
|
|
namelen + 1, &errmsg, err))
|
|
return errmsg;
|
|
name_offset += namelen + 1;
|
|
}
|
|
else
|
|
{
|
|
memcpy (&syms[0].sym.u.xcoff32.n.n_name[0], section->name,
|
|
strlen (section->name));
|
|
memset (&syms[0].sym.u.xcoff32.n.n_name[strlen (section->name)], 0,
|
|
N_SYMNMLEN - strlen (section->name));
|
|
}
|
|
|
|
if (!simple_object_internal_write (descriptor, secsym_offset,
|
|
(const unsigned char *) &syms[0],
|
|
sizeof (syms), &errmsg, err))
|
|
return errmsg;
|
|
secsym_offset += sizeof (syms);
|
|
}
|
|
|
|
if (!simple_object_xcoff_write_filehdr (sobj, descriptor, nscns,
|
|
symtab_offset, nsyms, &errmsg, err))
|
|
return errmsg;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/* Release the private data for an simple_object_write structure. */
|
|
|
|
static void
|
|
simple_object_xcoff_release_write (void *data)
|
|
{
|
|
XDELETE (data);
|
|
}
|
|
|
|
/* The XCOFF functions. */
|
|
|
|
const struct simple_object_functions simple_object_xcoff_functions =
|
|
{
|
|
simple_object_xcoff_match,
|
|
simple_object_xcoff_find_sections,
|
|
simple_object_xcoff_fetch_attributes,
|
|
simple_object_xcoff_release_read,
|
|
simple_object_xcoff_attributes_merge,
|
|
simple_object_xcoff_release_attributes,
|
|
simple_object_xcoff_start_write,
|
|
simple_object_xcoff_write_to_file,
|
|
simple_object_xcoff_release_write,
|
|
NULL
|
|
};
|