bfd:
* mach-o.c (bfd_mach_o_build_commands): Make the building of each command type independent.
This commit is contained in:
Iain Sandoe
parent
675399c96d
commit
bbd561712c
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@ -1,3 +1,8 @@
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2012-01-11 Iain Sandoe <idsandoe@googlemail.com>
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* mach-o.c (bfd_mach_o_build_commands): Make the building of each
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command type independent.
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2012-01-11 Alan Modra <amodra@gmail.com>
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* elf64-ppc.c: Define more insns used in plt call stubs.
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134
bfd/mach-o.c
134
bfd/mach-o.c
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@ -2153,11 +2153,11 @@ bfd_boolean
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bfd_mach_o_build_commands (bfd *abfd)
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{
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bfd_mach_o_data_struct *mdata = bfd_mach_o_get_data (abfd);
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unsigned int wide = mach_o_wide_p (&mdata->header);
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bfd_mach_o_segment_command *seg = NULL;
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bfd_mach_o_load_command *cmd;
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bfd_mach_o_load_command *symtab_cmd;
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unsigned symcind;
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unsigned wide = mach_o_wide_p (&mdata->header);
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int segcmd_idx = -1;
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int symtab_idx = -1;
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int dysymtab_idx = -1;
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unsigned long base_offset = 0;
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/* Return now if commands are already present. */
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if (mdata->header.ncmds)
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@ -2187,31 +2187,48 @@ bfd_mach_o_build_commands (bfd *abfd)
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if (!bfd_mach_o_mangle_symbols (abfd))
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return FALSE;
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/* It's valid to have a file with only absolute symbols... */
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if (mdata->nsects > 0)
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{
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mdata->header.ncmds = 1;
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symcind = 1;
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}
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else
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symcind = 0;
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/* Very simple command set (only really applicable to MH_OBJECTs):
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All the commands are optional - present only when there is suitable data.
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(i.e. it is valid to have an empty file)
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/* It's OK to have a file with only section statements. */
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if (bfd_get_symcount (abfd) > 0)
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mdata->header.ncmds += 1;
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/* Very simple version (only really applicable to MH_OBJECTs):
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a command (segment) to contain all the sections,
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a command for the symbol table
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a n (optional) command for the dysymtab.
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command for the symbol table,
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a command for the dysymtab.
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??? maybe we should assert that this is an MH_OBJECT? */
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if (bfd_mach_o_should_emit_dysymtab ()
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&& bfd_get_symcount (abfd) > 0)
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mdata->header.ncmds += 1;
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if (mdata->nsects > 0)
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{
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segcmd_idx = 0;
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mdata->header.ncmds = 1;
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}
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/* A bit weird, but looks like no content;
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if (bfd_get_symcount (abfd) > 0)
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{
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mdata->header.ncmds++;
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symtab_idx = segcmd_idx + 1; /* 0 if the seg command is absent. */
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}
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/* FIXME:
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This is a rather crude test for whether we should build a dysymtab. */
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if (bfd_mach_o_should_emit_dysymtab ()
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&& bfd_get_symcount (abfd))
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{
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mdata->header.ncmds++;
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/* If there should be a case where a dysymtab could be emitted without
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a symtab (seems improbable), this would need amending. */
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dysymtab_idx = symtab_idx + 1;
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}
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if (wide)
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base_offset = BFD_MACH_O_HEADER_64_SIZE;
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else
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base_offset = BFD_MACH_O_HEADER_SIZE;
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/* Well, we must have a header, at least. */
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mdata->filelen = base_offset;
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/* A bit unusual, but no content is valid;
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as -n empty.s -o empty.o */
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if (mdata->header.ncmds == 0)
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return TRUE;
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@ -2221,10 +2238,10 @@ bfd_mach_o_build_commands (bfd *abfd)
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if (mdata->commands == NULL)
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return FALSE;
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if (mdata->nsects > 0)
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if (segcmd_idx >= 0)
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{
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cmd = &mdata->commands[0];
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seg = &cmd->command.segment;
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bfd_mach_o_load_command *cmd = &mdata->commands[segcmd_idx];
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bfd_mach_o_segment_command *seg = &cmd->command.segment;
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/* Count the segctions in the special blank segment used for MH_OBJECT. */
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seg->nsects = bfd_mach_o_count_sections_for_seg (NULL, mdata);
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@ -2232,52 +2249,61 @@ bfd_mach_o_build_commands (bfd *abfd)
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return FALSE;
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/* Init segment command. */
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cmd->offset = base_offset;
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if (wide)
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{
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cmd->type = BFD_MACH_O_LC_SEGMENT_64;
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cmd->offset = BFD_MACH_O_HEADER_64_SIZE;
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cmd->len = BFD_MACH_O_LC_SEGMENT_64_SIZE
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+ BFD_MACH_O_SECTION_64_SIZE * seg->nsects;
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}
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else
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{
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cmd->type = BFD_MACH_O_LC_SEGMENT;
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cmd->offset = BFD_MACH_O_HEADER_SIZE;
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cmd->len = BFD_MACH_O_LC_SEGMENT_SIZE
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+ BFD_MACH_O_SECTION_SIZE * seg->nsects;
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}
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cmd->type_required = FALSE;
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mdata->header.sizeofcmds = cmd->len;
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mdata->filelen = cmd->offset + cmd->len;
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mdata->filelen += cmd->len;
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}
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if (bfd_get_symcount (abfd) > 0)
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if (symtab_idx >= 0)
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{
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/* Init symtab command. */
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symtab_cmd = &mdata->commands[symcind];
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bfd_mach_o_load_command *cmd = &mdata->commands[symtab_idx];
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symtab_cmd->type = BFD_MACH_O_LC_SYMTAB;
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if (symcind > 0)
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symtab_cmd->offset = mdata->commands[0].offset
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+ mdata->commands[0].len;
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else
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symtab_cmd->offset = 0;
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symtab_cmd->len = 6 * 4;
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symtab_cmd->type_required = FALSE;
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mdata->header.sizeofcmds += symtab_cmd->len;
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mdata->filelen += symtab_cmd->len;
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cmd->type = BFD_MACH_O_LC_SYMTAB;
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cmd->offset = base_offset;
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if (segcmd_idx >= 0)
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cmd->offset += mdata->commands[segcmd_idx].len;
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cmd->len = sizeof (struct mach_o_symtab_command_external)
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+ BFD_MACH_O_LC_SIZE;
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cmd->type_required = FALSE;
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mdata->header.sizeofcmds += cmd->len;
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mdata->filelen += cmd->len;
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}
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/* If required, setup symtab command. */
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if (bfd_mach_o_should_emit_dysymtab ()
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&& bfd_get_symcount (abfd) > 0)
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/* If required, setup symtab command, see comment above about the quality
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of this test. */
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if (dysymtab_idx >= 0)
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{
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cmd = &mdata->commands[symcind+1];
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bfd_mach_o_load_command *cmd = &mdata->commands[dysymtab_idx];
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cmd->type = BFD_MACH_O_LC_DYSYMTAB;
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cmd->offset = symtab_cmd->offset + symtab_cmd->len;
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if (symtab_idx >= 0)
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cmd->offset = mdata->commands[symtab_idx].offset
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+ mdata->commands[symtab_idx].len;
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else if (segcmd_idx >= 0)
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cmd->offset = mdata->commands[segcmd_idx].offset
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+ mdata->commands[segcmd_idx].len;
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else
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cmd->offset = base_offset;
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cmd->type_required = FALSE;
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cmd->len = 18 * 4 + BFD_MACH_O_LC_SIZE;
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cmd->len = sizeof (struct mach_o_dysymtab_command_external)
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+ BFD_MACH_O_LC_SIZE;
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mdata->header.sizeofcmds += cmd->len;
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mdata->filelen += cmd->len;
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@ -2285,15 +2311,15 @@ bfd_mach_o_build_commands (bfd *abfd)
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/* So, now we have sized the commands and the filelen set to that.
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Now we can build the segment command and set the section file offsets. */
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if (mdata->nsects > 0
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&& ! bfd_mach_o_build_seg_command (NULL, mdata, seg))
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if (segcmd_idx >= 0
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&& ! bfd_mach_o_build_seg_command
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(NULL, mdata, &mdata->commands[segcmd_idx].command.segment))
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return FALSE;
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/* If we're doing a dysymtab, cmd points to its load command. */
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if (bfd_mach_o_should_emit_dysymtab ()
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&& bfd_get_symcount (abfd) > 0
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if (dysymtab_idx >= 0
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&& ! bfd_mach_o_build_dysymtab_command (abfd, mdata,
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&mdata->commands[symcind+1]))
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&mdata->commands[dysymtab_idx]))
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return FALSE;
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/* The symtab command is filled in when the symtab is written. */
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