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|
/* Copyright (C) 2001 Red Hat, Inc.
Written by Jakub Jelinek <jakub@redhat.com>, 2001.
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,
Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#include <config.h>
#include <assert.h>
#include <byteswap.h>
#include <endian.h>
#include <error.h>
#include <stddef.h>
#include "prelink.h"
#define F8(x) unsigned char x[1];
#define F16(x) unsigned char x[2];
#define F24(x) unsigned char x[3];
#define F32(x) unsigned char x[4];
#define F64(x) unsigned char x[8];
typedef struct
{
F16(magic)
F16(vstamp)
F32(ilineMax)
F32(cbLine)
F32(cbLineOffset)
F32(idnMax)
F32(cbDnOffset)
F32(ipdMax)
F32(cbPdOffset)
F32(isymMax)
F32(cbSymOffset)
F32(ioptMax)
F32(cbOptOffset)
F32(iauxMax)
F32(cbAuxOffset)
F32(issMax)
F32(cbSsOffset)
F32(issExtMax)
F32(cbSsExtOffset)
F32(ifdMax)
F32(cbFdOffset)
F32(crfd)
F32(cbRfdOffset)
F32(iextMax)
F32(cbExtOffset)
} mdebug_hdr_32;
typedef struct
{
F16(magic)
F16(vstamp)
F32(ilineMax)
F32(idnMax)
F32(ipdMax)
F32(isymMax)
F32(ioptMax)
F32(iauxMax)
F32(issMax)
F32(issExtMax)
F32(ifdMax)
F32(crfd)
F32(iextMax)
F64(cbLine)
F64(cbLineOffset)
F64(cbDnOffset)
F64(cbPdOffset)
F64(cbSymOffset)
F64(cbOptOffset)
F64(cbAuxOffset)
F64(cbSsOffset)
F64(cbSsExtOffset)
F64(cbFdOffset)
F64(cbRfdOffset)
F64(cbExtOffset)
} mdebug_hdr_64;
typedef struct
{
F32(adr)
F32(rss)
F32(issBase)
F32(cbSs)
F32(isymBase)
F32(csym)
F32(ilineBase)
F32(cline)
F32(ioptBase)
F32(copt)
F16(ipdFirst)
F16(cpd)
F32(iauxBase)
F32(caux)
F32(rfdBase)
F32(crfd)
F8(bits1)
F24(bits2)
F32(cbLineOffset)
F32(cbLine)
} mdebug_fdr_32;
typedef struct
{
F64(adr)
F64(cbLineOffset)
F64(cbLine)
F64(cbSs)
F32(rss)
F32(issBase)
F32(isymBase)
F32(csym)
F32(ilineBase)
F32(cline)
F32(ioptBase)
F32(copt)
F32(ipdFirst)
F32(cpd)
F32(iauxBase)
F32(caux)
F32(rfdBase)
F32(crfd)
F8(bits1)
F24(bits2)
F32(padding)
} mdebug_fdr_64;
typedef struct
{
F32(iss)
F32(value)
F8(bits1)
F8(bits2)
F8(bits3)
F8(bits4)
} mdebug_sym_32;
typedef struct
{
F64(value)
F32(iss)
F8(bits1)
F8(bits2)
F8(bits3)
F8(bits4)
} mdebug_sym_64;
typedef struct
{
F8(bits1)
F8(bits2)
F16(fd)
mdebug_sym_32 asym;
} mdebug_ext_32;
typedef struct
{
mdebug_sym_64 asym;
F8(bits1)
F24(bits2)
F32(fd)
} mdebug_ext_64;
typedef struct
{
F32(adr)
F32(isym)
F32(iline)
F32(regmask)
F32(regoffset)
F32(iopt)
F32(fregmask)
F32(fregoffset)
F32(frameoffset)
F16(framereg)
F16(pcreg)
F32(lnLow)
F32(lnHigh)
F32(cbLineOffset)
} mdebug_pdr_32;
typedef struct
{
F64(adr)
F64(cbLineOffset)
F32(isym)
F32(iline)
F32(regmask)
F32(regoffset)
F32(iopt)
F32(fregmask)
F32(fregoffset)
F32(frameoffset)
F32(lnLow)
F32(lnHigh)
F8(gp_prologue)
F8(bits1)
F8(bits2)
F8(localoff)
F16(framereg)
F16(pcreg)
} mdebug_pdr_64;
typedef struct
{
F32(bits);
} mdebug_rndx;
typedef struct
{
F8(bits1)
F8(bits2)
F8(bits3)
F8(bits4)
mdebug_rndx rndx;
F32(offset)
} mdebug_opt;
typedef struct
{
F32(rfd)
F32(index)
} mdebug_dnr;
typedef struct
{
F32(rfd)
} mdebug_rfd;
#define scNil 0
#define scText 1
#define scData 2
#define scBss 3
#define scRegister 4
#define scAbs 5
#define scUndefined 6
#define scCdbLocal 7
#define scBits 8
#define scCdbSystem 9
#define scDbx 9
#define scRegImage 10
#define scInfo 11
#define scUserStruct 12
#define scSData 13
#define scSBss 14
#define scRData 15
#define scVar 16
#define scCommon 17
#define scSCommon 18
#define scVarRegister 19
#define scVariant 20
#define scSUndefined 21
#define scInit 22
#define scBasedVar 23
#define scXData 24
#define scPData 25
#define scFini 26
#define scRConst 27
#define scMax 32
#define stNil 0
#define stGlobal 1
#define stStatic 2
#define stParam 3
#define stLocal 4
#define stLabel 5
#define stProc 6
#define stBlock 7
#define stEnd 8
#define stMember 9
#define stTypedef 10
#define stFile 11
#define stRegReloc 12
#define stForward 13
#define stStaticProc 14
#define stConstant 15
#define stStaParam 16
#define stStruct 26
#define stUnion 27
#define stEnum 28
#define stIndirect 34
#define stMax 64
struct mdebug
{
uint32_t (*read_32) (char *);
GElf_Addr (*read_ptr) (char *);
void (*write_ptr) (char *, GElf_Addr);
void (*adjust_sym) (struct mdebug *, unsigned char *, GElf_Addr, GElf_Addr);
unsigned char *buf;
DSO *dso;
};
static uint32_t
read_native_32 (char *p)
{
return *(uint32_t *)p;
}
static uint32_t
read_swap_32 (char *p)
{
return bswap_32 (*(uint32_t *)p);
}
static GElf_Addr
read_native_ptr32 (char *p)
{
return *(uint32_t *)p;
}
static GElf_Addr
read_swap_ptr32 (char *p)
{
return bswap_32 (*(uint32_t *)p);
}
static void
write_native_ptr32 (char *p, GElf_Addr v)
{
*(uint32_t *)p = v;
}
static void
write_swap_ptr32 (char *p, GElf_Addr v)
{
*(uint32_t *)p = bswap_32 (v);
}
static GElf_Addr
read_native_ptr64 (char *p)
{
return *(uint64_t *)p;
}
static GElf_Addr
read_swap_ptr64 (char *p)
{
return bswap_64 (*(uint64_t *)p);
}
static void
write_native_ptr64 (char *p, GElf_Addr v)
{
*(uint64_t *)p = v;
}
static void
write_swap_ptr64 (char *p, GElf_Addr v)
{
*(uint64_t *)p = bswap_64 (v);
}
static inline int
mdebug_sym_relocate (unsigned int st, unsigned int sc)
{
switch (sc)
{
case scData:
case scBss:
case scAbs:
case scSData:
case scSBss:
case scRData:
case scXData:
case scPData:
return 1;
case scText:
case scInit:
case scFini:
case scRConst:
if (st != stBlock && st != stEnd && st != stFile)
return 1;
default:
return 0;
}
}
static void
adjust_mdebug_sym_le32 (struct mdebug *mdebug, mdebug_sym_32 *symptr,
GElf_Addr start, GElf_Addr adjust)
{
unsigned int st, sc;
GElf_Addr addr;
st = symptr->bits1[0] & 0x3f;
sc = (symptr->bits1[0] >> 6) | ((symptr->bits2[0] & 7) << 2);
if (mdebug_sym_relocate (st, sc))
{
addr = mdebug->read_ptr (symptr->value);
if (addr >= start && (addr || sc != scAbs))
mdebug->write_ptr (symptr->value, addr + adjust);
}
}
static void
adjust_mdebug_sym_be32 (struct mdebug *mdebug, mdebug_sym_32 *symptr,
GElf_Addr start, GElf_Addr adjust)
{
unsigned int st, sc;
GElf_Addr addr;
st = symptr->bits1[0] >> 2;
sc = ((symptr->bits1[0] & 3) << 3) | (symptr->bits2[0] >> 5);
if (mdebug_sym_relocate (st, sc))
{
addr = mdebug->read_ptr (symptr->value);
if (addr >= start && (addr || sc != scAbs))
mdebug->write_ptr (symptr->value, addr + adjust);
}
}
static void
adjust_mdebug_sym_le64 (struct mdebug *mdebug, mdebug_sym_64 *symptr,
GElf_Addr start, GElf_Addr adjust)
{
unsigned int st, sc;
GElf_Addr addr;
st = symptr->bits1[0] & 0x3f;
sc = (symptr->bits1[0] >> 6) | ((symptr->bits2[0] & 7) << 2);
if (mdebug_sym_relocate (st, sc))
{
addr = mdebug->read_ptr (symptr->value);
if (addr >= start && (addr || sc != scAbs))
mdebug->write_ptr (symptr->value, addr + adjust);
}
}
static void
adjust_mdebug_sym_be64 (struct mdebug *mdebug, mdebug_sym_64 *symptr,
GElf_Addr start, GElf_Addr adjust)
{
unsigned int st, sc;
GElf_Addr addr;
st = symptr->bits1[0] >> 2;
sc = ((symptr->bits1[0] & 3) << 3) | (symptr->bits2[0] >> 5);
if (mdebug_sym_relocate (st, sc))
{
addr = mdebug->read_ptr (symptr->value);
if (addr >= start && (addr || sc != scAbs))
mdebug->write_ptr (symptr->value, addr + adjust);
}
}
#define SIZEOf(x) \
(dso->arch->class == ELFCLASS32 ? sizeof (x##_32) : sizeof (x##_64))
#define SIZEOF(x) SIZEOf(x)
#define OFFSETOf(x,y) \
(dso->arch->class == ELFCLASS32 ? offsetof (x##_32, y) : offsetof (x##_64, y))
#define OFFSETOF(x,y) OFFSETOf(x,y)
static int
start_mdebug (DSO *dso, int n, struct mdebug *mdebug)
{
Elf_Data *data = NULL;
Elf_Scn *scn = dso->scn[n];
data = elf_getdata (scn, NULL);
mdebug->buf = data->d_buf;
mdebug->dso = dso;
assert (data != NULL && data->d_buf != NULL);
assert (elf_getdata (scn, data) == NULL);
assert (data->d_off == 0 && data->d_size == dso->shdr[n].sh_size);
if (dso->mdebug_orig_offset == 0)
dso->mdebug_orig_offset = dso->shdr[n].sh_offset;
#if __BYTE_ORDER == __BIG_ENDIAN
if (dso->ehdr.e_ident[EI_DATA] == ELFDATA2MSB)
#elif __BYTE_ORDER == __LITTLE_ENDIAN
if (dso->ehdr.e_ident[EI_DATA] == ELFDATA2LSB)
#else
# error Not supported host endianess
#endif
{
mdebug->read_32 = read_native_32;
if (dso->arch->class == ELFCLASS32)
{
mdebug->read_ptr = read_native_ptr32;
mdebug->write_ptr = write_native_ptr32;
}
else
{
mdebug->read_ptr = read_native_ptr64;
mdebug->write_ptr = write_native_ptr64;
}
}
#if __BYTE_ORDER == __BIG_ENDIAN
else if (dso->ehdr.e_ident[EI_DATA] == ELFDATA2LSB)
#elif __BYTE_ORDER == __LITTLE_ENDIAN
else if (dso->ehdr.e_ident[EI_DATA] == ELFDATA2MSB)
#endif
{
mdebug->read_32 = read_swap_32;
if (dso->arch->class == ELFCLASS32)
{
mdebug->read_ptr = read_swap_ptr32;
mdebug->write_ptr = write_swap_ptr32;
}
else
{
mdebug->read_ptr = read_swap_ptr64;
mdebug->write_ptr = write_swap_ptr64;
}
}
else
{
error (0, 0, "%s: Wrong ELF data enconding", dso->filename);
return 1;
}
if (dso->ehdr.e_ident[EI_DATA] == ELFDATA2LSB)
{
if (dso->arch->class == ELFCLASS32)
mdebug->adjust_sym = (void *) adjust_mdebug_sym_le32;
else
mdebug->adjust_sym = (void *) adjust_mdebug_sym_le64;
}
else
{
if (dso->arch->class == ELFCLASS32)
mdebug->adjust_sym = (void *) adjust_mdebug_sym_be32;
else
mdebug->adjust_sym = (void *) adjust_mdebug_sym_be64;
}
if (dso->shdr[n].sh_size < SIZEOF (mdebug_hdr))
{
error (0, 0, "%s: .mdebug section too small", dso->filename);
return 1;
}
return 0;
}
int
adjust_mdebug (DSO *dso, int n, GElf_Addr start, GElf_Addr adjust)
{
struct mdebug mdebug;
struct { GElf_Off offset; GElf_Off size; size_t entsize; } regions [11];
int i = 0;
unsigned char *symptr, *endptr;
if (start_mdebug (dso, n, &mdebug))
return 1;
#define READ(x, y, longsize, sz) \
do { \
unsigned char *tmp; \
tmp = mdebug.buf + OFFSETOF (mdebug_hdr, x); \
regions[i].offset = mdebug.read_ptr (tmp); \
tmp = mdebug.buf + OFFSETOF (mdebug_hdr, y); \
if (longsize) \
regions[i].size = mdebug.read_ptr (tmp); \
else \
regions[i].size = mdebug.read_32 (tmp); \
regions[i].entsize = sz; \
++i; \
} while (0)
READ (cbLineOffset, cbLine, 1, sizeof (char));
READ (cbDnOffset, idnMax, 0, sizeof (mdebug_dnr));
READ (cbPdOffset, ipdMax, 0, SIZEOF (mdebug_pdr));
READ (cbSymOffset, isymMax, 0, SIZEOF (mdebug_sym));
READ (cbOptOffset, ioptMax, 0, sizeof (mdebug_opt));
READ (cbAuxOffset, iauxMax, 0, 4 * sizeof (char));
READ (cbSsOffset, issMax, 0, sizeof (char));
READ (cbSsExtOffset, issExtMax, 0, sizeof (char));
READ (cbFdOffset, ifdMax, 0, SIZEOF (mdebug_fdr));
READ (cbRfdOffset, crfd, 0, sizeof (mdebug_rfd));
READ (cbExtOffset, iextMax, 0, SIZEOF (mdebug_ext));
#undef READ
for (i = 0; i < 11; ++i)
{
if (regions[i].offset)
regions[i].offset -= dso->mdebug_orig_offset;
regions[i].size *= regions[i].entsize;
if (regions[i].offset >= dso->shdr[n].sh_size
|| regions[i].offset + regions[i].size > dso->shdr[n].sh_size)
{
error (0, 0, "%s: File offsets in .mdebug header point outside of .mdebug section",
dso->filename);
return 1;
}
}
/* Adjust symbols. */
if (regions[3].offset)
for (symptr = mdebug.buf + regions[3].offset,
endptr = symptr + regions[3].size;
symptr < endptr;
symptr += regions[3].entsize)
mdebug.adjust_sym (&mdebug, symptr, start, adjust);
/* Adjust file descriptor's addresses. */
if (regions[8].offset)
for (symptr = mdebug.buf + regions[8].offset,
endptr = symptr + regions[8].size;
symptr < endptr;
symptr += regions[8].entsize)
{
GElf_Addr addr;
assert (offsetof (mdebug_fdr_32, adr) == 0);
assert (offsetof (mdebug_fdr_64, adr) == 0);
addr = mdebug.read_ptr (symptr);
if (addr >= start)
mdebug.write_ptr (symptr, addr + adjust);
}
/* Adjust extended symbols. */
if (regions[10].offset)
for (symptr = mdebug.buf + regions[10].offset
+ OFFSETOF (mdebug_ext, asym),
endptr = symptr + regions[10].size;
symptr < endptr;
symptr += regions[10].entsize)
mdebug.adjust_sym (&mdebug, symptr, start, adjust);
return 0;
}
int
finalize_mdebug (DSO *dso)
{
int i;
struct mdebug mdebug;
GElf_Addr adj;
for (i = 1; i < dso->ehdr.e_shnum; i++)
if ((dso->arch->machine == EM_ALPHA
&& dso->shdr[i].sh_type == SHT_ALPHA_DEBUG)
|| (dso->arch->machine == EM_MIPS
&& dso->shdr[i].sh_type == SHT_MIPS_DEBUG))
break;
assert (i < dso->ehdr.e_shnum);
/* If .mdebug's file position did not change, there is nothing to do. */
adj = dso->shdr[i].sh_offset - dso->mdebug_orig_offset;
if (! adj)
return 0;
if (start_mdebug (dso, i, &mdebug))
return 1;
#define ADJUST(x) \
do { \
unsigned char *tmp; \
GElf_Addr val; \
tmp = mdebug.buf + OFFSETOF (mdebug_hdr, x); \
val = mdebug.read_ptr (tmp); \
if (! val) \
break; \
val += adj; \
if (val < dso->shdr[i].sh_offset \
|| val >= dso->shdr[i].sh_offset + dso->shdr[i].sh_size) \
{ \
error (0, 0, "%s: File offsets in .mdebug header point outside of .mdebug section", \
dso->filename); \
return 1; \
} \
mdebug.write_ptr (tmp, val); \
} while (0)
ADJUST (cbLineOffset);
ADJUST (cbDnOffset);
ADJUST (cbPdOffset);
ADJUST (cbSymOffset);
ADJUST (cbOptOffset);
ADJUST (cbAuxOffset);
ADJUST (cbSsOffset);
ADJUST (cbSsExtOffset);
ADJUST (cbFdOffset);
ADJUST (cbRfdOffset);
ADJUST (cbExtOffset);
#undef ADJUST
return 0;
}
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