diff options
Diffstat (limited to 'bfd/cpu-ns32k.c')
| -rw-r--r-- | bfd/cpu-ns32k.c | 844 |
1 files changed, 0 insertions, 844 deletions
diff --git a/bfd/cpu-ns32k.c b/bfd/cpu-ns32k.c deleted file mode 100644 index c01599e080a..00000000000 --- a/bfd/cpu-ns32k.c +++ /dev/null @@ -1,844 +0,0 @@ -/* BFD support for the ns32k architecture. - Copyright 1990, 1991, 1994, 1995, 1998, 2000 - Free Software Foundation, Inc. - Almost totally rewritten by Ian Dall from initial work - by Andrew Cagney. - -This file is part of BFD, the Binary File Descriptor library. - -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 of the License, 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 "bfd.h" -#include "sysdep.h" -#include "libbfd.h" -#include "ns32k.h" - -#define N(machine, printable, d, next) \ -{ 32, 32, 8, bfd_arch_ns32k, machine, "ns32k",printable,3,d,bfd_default_compatible,bfd_default_scan, next, } - -static const bfd_arch_info_type arch_info_struct[] = -{ - N(32532,"ns32k:32532",true, 0), /* the word ns32k will match this too */ -}; - -const bfd_arch_info_type bfd_ns32k_arch = - N(32032,"ns32k:32032",false, &arch_info_struct[0]); - -static long -ns32k_sign_extend(value, bits) - int value; - int bits; -{ - value = value & ((1 << bits) - 1); - return (value & (1 << (bits-1)) - ? value | (~((1 << bits) - 1)) - : value); -} - -long -_bfd_ns32k_get_displacement(buffer, offset, size) - bfd_byte *buffer; - long offset; - long size; -{ - long value; - buffer += offset; - switch (size) - { - case 1: - value = ns32k_sign_extend (*buffer, 7); - break; - case 2: - value = ns32k_sign_extend(*buffer++, 6); - value = (value << 8) | (0xff & *buffer); - break; - case 4: - value = ns32k_sign_extend(*buffer++, 6); - value = (value << 8) | (0xff & *buffer++); - value = (value << 8) | (0xff & *buffer++); - value = (value << 8) | (0xff & *buffer); - break; - default: - abort (); - return 0; - } - return value; -} - -int -_bfd_ns32k_put_displacement(value, buffer, offset, size) - long value; - bfd_byte *buffer; - long offset; - long size; -{ - buffer += offset; - switch (size) - { - case 1: - if (value < -64 || value > 63) - return -1; - value&=0x7f; - *buffer++=value; - break; - case 2: - if (value < -8192 || value > 8191) - return -1; - value&=0x3fff; - value|=0x8000; - *buffer++=(value>>8); - *buffer++=value; - break; - case 4: - if (value < -0x1f000000 || value >= 0x20000000) - return -1; - value|=0xc0000000; - *buffer++=(value>>24); - *buffer++=(value>>16); - *buffer++=(value>>8); - *buffer++=value; - break; - default: - return -1; - } - return 0; -} - -long -_bfd_ns32k_get_immediate (buffer, offset, size) - bfd_byte *buffer; - long offset; - long size; -{ - long value = 0; - buffer += offset; - switch (size) - { - case 4: - value = (value << 8) | (*buffer++ & 0xff); - case 3: - value = (value << 8) | (*buffer++ & 0xff); - case 2: - value = (value << 8) | (*buffer++ & 0xff); - case 1: - value = (value << 8) | (*buffer++ & 0xff); - } - return value; -} - -int -_bfd_ns32k_put_immediate (value, buffer, offset, size) - long value; - bfd_byte *buffer; - long offset; - long size; -{ - buffer += offset + size - 1; - switch (size) - { - case 4: - *buffer-- = (value & 0xff); value >>= 8; - case 3: - *buffer-- = (value & 0xff); value >>= 8; - case 2: - *buffer-- = (value & 0xff); value >>= 8; - case 1: - *buffer-- = (value & 0xff); value >>= 8; - } - return 0; -} - -/* This is just like the standard perform_relocation except we - * use get_data and put_data which know about the ns32k - * storage methods. - * This is probably a lot more complicated than it needs to be! - */ -static bfd_reloc_status_type -do_ns32k_reloc (abfd, reloc_entry, symbol, data, input_section, output_bfd, - error_message, get_data, put_data) - bfd *abfd; - arelent *reloc_entry; - struct symbol_cache_entry *symbol; - PTR data; - asection *input_section; - bfd *output_bfd; - char **error_message ATTRIBUTE_UNUSED; - long (*get_data) (); - int (*put_data) (); -{ - int overflow = 0; - bfd_vma relocation; - bfd_reloc_status_type flag = bfd_reloc_ok; - bfd_size_type addr = reloc_entry->address; - bfd_vma output_base = 0; - reloc_howto_type *howto = reloc_entry->howto; - asection *reloc_target_output_section; - - if ((symbol->section == &bfd_abs_section) - && output_bfd != (bfd *) NULL) - { - reloc_entry->address += input_section->output_offset; - return bfd_reloc_ok; - } - - /* If we are not producing relocateable output, return an error if - the symbol is not defined. An undefined weak symbol is - considered to have a value of zero (SVR4 ABI, p. 4-27). */ - if (symbol->section == &bfd_und_section - && (symbol->flags & BSF_WEAK) == 0 - && output_bfd == (bfd *) NULL) - flag = bfd_reloc_undefined; - - /* Is the address of the relocation really within the section? */ - if (reloc_entry->address > input_section->_cooked_size) - return bfd_reloc_outofrange; - - /* Work out which section the relocation is targetted at and the - initial relocation command value. */ - - /* Get symbol value. (Common symbols are special.) */ - if (bfd_is_com_section (symbol->section)) - relocation = 0; - else - relocation = symbol->value; - - reloc_target_output_section = symbol->section->output_section; - - /* Convert input-section-relative symbol value to absolute. */ - if (output_bfd && howto->partial_inplace == false) - output_base = 0; - else - output_base = reloc_target_output_section->vma; - - relocation += output_base + symbol->section->output_offset; - - /* Add in supplied addend. */ - relocation += reloc_entry->addend; - - /* Here the variable relocation holds the final address of the - symbol we are relocating against, plus any addend. */ - - if (howto->pc_relative == true) - { - /* This is a PC relative relocation. We want to set RELOCATION - to the distance between the address of the symbol and the - location. RELOCATION is already the address of the symbol. - - We start by subtracting the address of the section containing - the location. - - If pcrel_offset is set, we must further subtract the position - of the location within the section. Some targets arrange for - the addend to be the negative of the position of the location - within the section; for example, i386-aout does this. For - i386-aout, pcrel_offset is false. Some other targets do not - include the position of the location; for example, m88kbcs, - or ELF. For those targets, pcrel_offset is true. - - If we are producing relocateable output, then we must ensure - that this reloc will be correctly computed when the final - relocation is done. If pcrel_offset is false we want to wind - up with the negative of the location within the section, - which means we must adjust the existing addend by the change - in the location within the section. If pcrel_offset is true - we do not want to adjust the existing addend at all. - - FIXME: This seems logical to me, but for the case of - producing relocateable output it is not what the code - actually does. I don't want to change it, because it seems - far too likely that something will break. */ - - relocation -= - input_section->output_section->vma + input_section->output_offset; - - if (howto->pcrel_offset == true) - relocation -= reloc_entry->address; - } - - if (output_bfd != (bfd *) NULL) - { - if (howto->partial_inplace == false) - { - /* This is a partial relocation, and we want to apply the relocation - to the reloc entry rather than the raw data. Modify the reloc - inplace to reflect what we now know. */ - reloc_entry->addend = relocation; - reloc_entry->address += input_section->output_offset; - return flag; - } - else - { - /* This is a partial relocation, but inplace, so modify the - reloc record a bit. - - If we've relocated with a symbol with a section, change - into a ref to the section belonging to the symbol. */ - - reloc_entry->address += input_section->output_offset; - - /* WTF?? */ - if (abfd->xvec->flavour == bfd_target_coff_flavour) - { -#if 1 - /* For m68k-coff, the addend was being subtracted twice during - relocation with -r. Removing the line below this comment - fixes that problem; see PR 2953. - -However, Ian wrote the following, regarding removing the line below, -which explains why it is still enabled: --djm - -If you put a patch like that into BFD you need to check all the COFF -linkers. I am fairly certain that patch will break coff-i386 (e.g., -SCO); see coff_i386_reloc in coff-i386.c where I worked around the -problem in a different way. There may very well be a reason that the -code works as it does. - -Hmmm. The first obvious point is that bfd_perform_relocation should -not have any tests that depend upon the flavour. It's seem like -entirely the wrong place for such a thing. The second obvious point -is that the current code ignores the reloc addend when producing -relocateable output for COFF. That's peculiar. In fact, I really -have no idea what the point of the line you want to remove is. - -A typical COFF reloc subtracts the old value of the symbol and adds in -the new value to the location in the object file (if it's a pc -relative reloc it adds the difference between the symbol value and the -location). When relocating we need to preserve that property. - -BFD handles this by setting the addend to the negative of the old -value of the symbol. Unfortunately it handles common symbols in a -non-standard way (it doesn't subtract the old value) but that's a -different story (we can't change it without losing backward -compatibility with old object files) (coff-i386 does subtract the old -value, to be compatible with existing coff-i386 targets, like SCO). - -So everything works fine when not producing relocateable output. When -we are producing relocateable output, logically we should do exactly -what we do when not producing relocateable output. Therefore, your -patch is correct. In fact, it should probably always just set -reloc_entry->addend to 0 for all cases, since it is, in fact, going to -add the value into the object file. This won't hurt the COFF code, -which doesn't use the addend; I'm not sure what it will do to other -formats (the thing to check for would be whether any formats both use -the addend and set partial_inplace). - -When I wanted to make coff-i386 produce relocateable output, I ran -into the problem that you are running into: I wanted to remove that -line. Rather than risk it, I made the coff-i386 relocs use a special -function; it's coff_i386_reloc in coff-i386.c. The function -specifically adds the addend field into the object file, knowing that -bfd_perform_relocation is not going to. If you remove that line, then -coff-i386.c will wind up adding the addend field in twice. It's -trivial to fix; it just needs to be done. - -The problem with removing the line is just that it may break some -working code. With BFD it's hard to be sure of anything. The right -way to deal with this is simply to build and test at least all the -supported COFF targets. It should be straightforward if time and disk -space consuming. For each target: - 1) build the linker - 2) generate some executable, and link it using -r (I would - probably use paranoia.o and link against newlib/libc.a, which - for all the supported targets would be available in - /usr/cygnus/progressive/H-host/target/lib/libc.a). - 3) make the change to reloc.c - 4) rebuild the linker - 5) repeat step 2 - 6) if the resulting object files are the same, you have at least - made it no worse - 7) if they are different you have to figure out which version is - right -*/ - relocation -= reloc_entry->addend; -#endif - reloc_entry->addend = 0; - } - else - { - reloc_entry->addend = relocation; - } - } - } - else - { - reloc_entry->addend = 0; - } - - /* FIXME: This overflow checking is incomplete, because the value - might have overflowed before we get here. For a correct check we - need to compute the value in a size larger than bitsize, but we - can't reasonably do that for a reloc the same size as a host - machine word. - FIXME: We should also do overflow checking on the result after - adding in the value contained in the object file. */ - if (howto->complain_on_overflow != complain_overflow_dont) - { - bfd_vma check; - - /* Get the value that will be used for the relocation, but - starting at bit position zero. */ - if (howto->rightshift > howto->bitpos) - check = relocation >> (howto->rightshift - howto->bitpos); - else - check = relocation << (howto->bitpos - howto->rightshift); - switch (howto->complain_on_overflow) - { - case complain_overflow_signed: - { - /* Assumes two's complement. */ - bfd_signed_vma reloc_signed_max = (1 << (howto->bitsize - 1)) - 1; - bfd_signed_vma reloc_signed_min = ~reloc_signed_max; - - /* The above right shift is incorrect for a signed value. - Fix it up by forcing on the upper bits. */ - if (howto->rightshift > howto->bitpos - && (bfd_signed_vma) relocation < 0) - check |= ((bfd_vma) - 1 - & ~((bfd_vma) - 1 - >> (howto->rightshift - howto->bitpos))); - if ((bfd_signed_vma) check > reloc_signed_max - || (bfd_signed_vma) check < reloc_signed_min) - flag = bfd_reloc_overflow; - } - break; - case complain_overflow_unsigned: - { - /* Assumes two's complement. This expression avoids - overflow if howto->bitsize is the number of bits in - bfd_vma. */ - bfd_vma reloc_unsigned_max = - (((1 << (howto->bitsize - 1)) - 1) << 1) | 1; - - if ((bfd_vma) check > reloc_unsigned_max) - flag = bfd_reloc_overflow; - } - break; - case complain_overflow_bitfield: - { - /* Assumes two's complement. This expression avoids - overflow if howto->bitsize is the number of bits in - bfd_vma. */ - bfd_vma reloc_bits = (((1 << (howto->bitsize - 1)) - 1) << 1) | 1; - - if (((bfd_vma) check & ~reloc_bits) != 0 - && ((bfd_vma) check & ~reloc_bits) != (-1 & ~reloc_bits)) - { - /* The above right shift is incorrect for a signed - value. See if turning on the upper bits fixes the - overflow. */ - if (howto->rightshift > howto->bitpos - && (bfd_signed_vma) relocation < 0) - { - check |= ((bfd_vma) - 1 - & ~((bfd_vma) - 1 - >> (howto->rightshift - howto->bitpos))); - if (((bfd_vma) check & ~reloc_bits) != (-1 & ~reloc_bits)) - flag = bfd_reloc_overflow; - } - else - flag = bfd_reloc_overflow; - } - } - break; - default: - abort (); - } - } - - /* - Either we are relocating all the way, or we don't want to apply - the relocation to the reloc entry (probably because there isn't - any room in the output format to describe addends to relocs) - */ - - /* The cast to bfd_vma avoids a bug in the Alpha OSF/1 C compiler - (OSF version 1.3, compiler version 3.11). It miscompiles the - following program: - - struct str - { - unsigned int i0; - } s = { 0 }; - - int - main () - { - unsigned long x; - - x = 0x100000000; - x <<= (unsigned long) s.i0; - if (x == 0) - printf ("failed\n"); - else - printf ("succeeded (%lx)\n", x); - } - */ - - relocation >>= (bfd_vma) howto->rightshift; - - /* Shift everything up to where it's going to be used */ - - relocation <<= (bfd_vma) howto->bitpos; - - /* Wait for the day when all have the mask in them */ - - /* What we do: - i instruction to be left alone - o offset within instruction - r relocation offset to apply - S src mask - D dst mask - N ~dst mask - A part 1 - B part 2 - R result - - Do this: - i i i i i o o o o o from bfd_get<size> - and S S S S S to get the size offset we want - + r r r r r r r r r r to get the final value to place - and D D D D D to chop to right size - ----------------------- - A A A A A - And this: - ... i i i i i o o o o o from bfd_get<size> - and N N N N N get instruction - ----------------------- - ... B B B B B - - And then: - B B B B B - or A A A A A - ----------------------- - R R R R R R R R R R put into bfd_put<size> - */ - -#define DOIT(x) \ - x = ( (x & ~howto->dst_mask) | (((x & howto->src_mask) + relocation) & howto->dst_mask)) - - switch (howto->size) - { - case 0: - { - char x = get_data (data, addr, 1); - DOIT (x); - overflow = put_data(x, data, addr, 1); - } - break; - - case 1: - if (relocation) - { - short x = get_data (data, addr, 2); - DOIT (x); - overflow = put_data(x, (unsigned char *) data, addr, 2); - } - break; - case 2: - if (relocation) - { - long x = get_data (data, addr, 4); - DOIT (x); - overflow = put_data(x, data, addr, 4); - } - break; - case -2: - { - long x = get_data(data, addr, 4); - relocation = -relocation; - DOIT(x); - overflow = put_data(x, data , addr, 4); - } - break; - - case 3: - /* Do nothing */ - break; - - case 4: -#ifdef BFD64 - if (relocation) - { - bfd_vma x = get_data (data, addr, 8); - DOIT (x); - overflow = put_data(x, data, addr, 8); - } -#else - abort (); -#endif - break; - default: - return bfd_reloc_other; - } - if ((howto->complain_on_overflow != complain_overflow_dont) && overflow) - return bfd_reloc_overflow; - - return flag; -} - -/* Relocate a given location using a given value and howto. */ - -bfd_reloc_status_type -_bfd_do_ns32k_reloc_contents ( howto, input_bfd, relocation, location, - get_data, put_data) - reloc_howto_type *howto; - bfd *input_bfd ATTRIBUTE_UNUSED; - bfd_vma relocation; - bfd_byte *location; - long (*get_data) (); - int (*put_data) (); -{ - int size; - bfd_vma x; - boolean overflow; - - /* If the size is negative, negate RELOCATION. This isn't very - general. */ - if (howto->size < 0) - relocation = -relocation; - - /* Get the value we are going to relocate. */ - size = bfd_get_reloc_size (howto); - switch (size) - { - default: - case 0: - abort (); - case 1: - case 2: - case 4: -#ifdef BFD64 - case 8: -#endif - x = get_data (location, 0, size); - break; - } - - /* Check for overflow. FIXME: We may drop bits during the addition - which we don't check for. We must either check at every single - operation, which would be tedious, or we must do the computations - in a type larger than bfd_vma, which would be inefficient. */ - overflow = false; - if (howto->complain_on_overflow != complain_overflow_dont) - { - bfd_vma check; - bfd_signed_vma signed_check; - bfd_vma add; - bfd_signed_vma signed_add; - - if (howto->rightshift == 0) - { - check = relocation; - signed_check = (bfd_signed_vma) relocation; - } - else - { - /* Drop unwanted bits from the value we are relocating to. */ - check = relocation >> howto->rightshift; - - /* If this is a signed value, the rightshift just dropped - leading 1 bits (assuming twos complement). */ - if ((bfd_signed_vma) relocation >= 0) - signed_check = check; - else - signed_check = (check - | ((bfd_vma) - 1 - & ~((bfd_vma) - 1 >> howto->rightshift))); - } - - /* Get the value from the object file. */ - add = x & howto->src_mask; - - /* Get the value from the object file with an appropriate sign. - The expression involving howto->src_mask isolates the upper - bit of src_mask. If that bit is set in the value we are - adding, it is negative, and we subtract out that number times - two. If src_mask includes the highest possible bit, then we - can not get the upper bit, but that does not matter since - signed_add needs no adjustment to become negative in that - case. */ - signed_add = add; - if ((add & (((~howto->src_mask) >> 1) & howto->src_mask)) != 0) - signed_add -= (((~howto->src_mask) >> 1) & howto->src_mask) << 1; - - /* Add the value from the object file, shifted so that it is a - straight number. */ - if (howto->bitpos == 0) - { - check += add; - signed_check += signed_add; - } - else - { - check += add >> howto->bitpos; - - /* For the signed case we use ADD, rather than SIGNED_ADD, - to avoid warnings from SVR4 cc. This is OK since we - explictly handle the sign bits. */ - if (signed_add >= 0) - signed_check += add >> howto->bitpos; - else - signed_check += ((add >> howto->bitpos) - | ((bfd_vma) - 1 - & ~((bfd_vma) - 1 >> howto->bitpos))); - } - - switch (howto->complain_on_overflow) - { - case complain_overflow_signed: - { - /* Assumes two's complement. */ - bfd_signed_vma reloc_signed_max = (1 << (howto->bitsize - 1)) - 1; - bfd_signed_vma reloc_signed_min = ~reloc_signed_max; - - if (signed_check > reloc_signed_max - || signed_check < reloc_signed_min) - overflow = true; - } - break; - case complain_overflow_unsigned: - { - /* Assumes two's complement. This expression avoids - overflow if howto->bitsize is the number of bits in - bfd_vma. */ - bfd_vma reloc_unsigned_max = - (((1 << (howto->bitsize - 1)) - 1) << 1) | 1; - - if (check > reloc_unsigned_max) - overflow = true; - } - break; - case complain_overflow_bitfield: - { - /* Assumes two's complement. This expression avoids - overflow if howto->bitsize is the number of bits in - bfd_vma. */ - bfd_vma reloc_bits = (((1 << (howto->bitsize - 1)) - 1) << 1) | 1; - - if ((check & ~reloc_bits) != 0 - && (((bfd_vma) signed_check & ~reloc_bits) - != (-1 & ~reloc_bits))) - overflow = true; - } - break; - default: - abort (); - } - } - - /* Put RELOCATION in the right bits. */ - relocation >>= (bfd_vma) howto->rightshift; - relocation <<= (bfd_vma) howto->bitpos; - - /* Add RELOCATION to the right bits of X. */ - x = ((x & ~howto->dst_mask) - | (((x & howto->src_mask) + relocation) & howto->dst_mask)); - - /* Put the relocated value back in the object file. */ - switch (size) - { - default: - case 0: - abort (); - case 1: - case 2: - case 4: -#ifdef BFD64 - case 8: -#endif - put_data(x, location, 0, size); - break; - } - - return overflow ? bfd_reloc_overflow : bfd_reloc_ok; -} - -bfd_reloc_status_type -_bfd_ns32k_reloc_disp (abfd, reloc_entry, symbol, data, input_section, - output_bfd, error_message) - bfd *abfd; - arelent *reloc_entry; - struct symbol_cache_entry *symbol; - PTR data; - asection *input_section; - bfd *output_bfd; - char **error_message; -{ - return do_ns32k_reloc (abfd, reloc_entry, symbol, data, input_section, - output_bfd, error_message, - _bfd_ns32k_get_displacement, - _bfd_ns32k_put_displacement); -} - -bfd_reloc_status_type -_bfd_ns32k_reloc_imm (abfd, reloc_entry, symbol, data, input_section, - output_bfd, error_message) - bfd *abfd; - arelent *reloc_entry; - struct symbol_cache_entry *symbol; - PTR data; - asection *input_section; - bfd *output_bfd; - char **error_message; -{ - return do_ns32k_reloc (abfd, reloc_entry, symbol, data, input_section, - output_bfd, error_message, _bfd_ns32k_get_immediate, - _bfd_ns32k_put_immediate); -} - -bfd_reloc_status_type -_bfd_ns32k_final_link_relocate (howto, input_bfd, input_section, contents, - address, value, addend) - reloc_howto_type *howto; - bfd *input_bfd; - asection *input_section; - bfd_byte *contents; - bfd_vma address; - bfd_vma value; - bfd_vma addend; -{ - bfd_vma relocation; - - /* Sanity check the address. */ - if (address > input_section->_cooked_size) - return bfd_reloc_outofrange; - - /* This function assumes that we are dealing with a basic relocation - against a symbol. We want to compute the value of the symbol to - relocate to. This is just VALUE, the value of the symbol, plus - ADDEND, any addend associated with the reloc. */ - relocation = value + addend; - - /* If the relocation is PC relative, we want to set RELOCATION to - the distance between the symbol (currently in RELOCATION) and the - location we are relocating. Some targets (e.g., i386-aout) - arrange for the contents of the section to be the negative of the - offset of the location within the section; for such targets - pcrel_offset is false. Other targets (e.g., m88kbcs or ELF) - simply leave the contents of the section as zero; for such - targets pcrel_offset is true. If pcrel_offset is false we do not - need to subtract out the offset of the location within the - section (which is just ADDRESS). */ - if (howto->pc_relative) - { - relocation -= (input_section->output_section->vma - + input_section->output_offset); - if (howto->pcrel_offset) - relocation -= address; - } - - return _bfd_ns32k_relocate_contents (howto, input_bfd, relocation, - contents + address); -} |