diff options
Diffstat (limited to 'gnu/usr.bin/binutils/gdb/i386-interix-tdep.c')
-rw-r--r-- | gnu/usr.bin/binutils/gdb/i386-interix-tdep.c | 358 |
1 files changed, 0 insertions, 358 deletions
diff --git a/gnu/usr.bin/binutils/gdb/i386-interix-tdep.c b/gnu/usr.bin/binutils/gdb/i386-interix-tdep.c deleted file mode 100644 index 0d2af2f0cf2..00000000000 --- a/gnu/usr.bin/binutils/gdb/i386-interix-tdep.c +++ /dev/null @@ -1,358 +0,0 @@ -/* Target-dependent code for Interix running on i386's, for GDB. - Copyright 2002 Free Software Foundation, Inc. - -This file is part of GDB. - -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 "defs.h" -#include "arch-utils.h" - -#include "frame.h" -#include "gdb_string.h" -#include "gdb-stabs.h" -#include "gdbcore.h" -#include "gdbtypes.h" -#include "i386-tdep.h" -#include "inferior.h" -#include "libbfd.h" -#include "objfiles.h" -#include "osabi.h" -#include "regcache.h" - -/* offsetof (mcontext_t, gregs.gregs[EBP]) */ -static const int mcontext_EBP_greg_offset = 180; - -/* offsetof (mcontext_t, gregs.gregs[EIP]) */ -static const int mcontext_EIP_greg_offset = 184; - -/* offsetof (mcontext_t, gregs.gregs[UESP]) */ -static const int mcontext_UESP_greg_offset = 196; - -/* offsetof (mcontext_t, gregs.reserved[1]) */ -static const int mcontext_syscall_greg_offset = 4; - -/* offsetof (_JUMP_BUFFER, Eip) */ -static const int jump_buffer_Eip_offset = 20; - -/* See procfs.c and *interix*.h in config/[alpha,i386]. */ -/* ??? These should be static, but this needs a bit of work before this - can be done. */ -CORE_ADDR tramp_start; -CORE_ADDR tramp_end; -CORE_ADDR null_start; -CORE_ADDR null_end; -int winver; /* Windows NT version number */ - -/* Forward declarations. */ -extern void _initialize_i386_interix_tdep (void); -extern initialize_file_ftype _initialize_i386_interix_tdep; - -/* Adjust the section offsets in an objfile structure so that it's correct - for the type of symbols being read (or undo it with the _restore - arguments). - - If main programs ever start showing up at other than the default Image - Base, this is where that would likely be applied. */ - -void -pei_adjust_objfile_offsets (struct objfile *objfile, - enum objfile_adjusts type) -{ - int i; - CORE_ADDR symbols_offset; - - switch (type) - { - case adjust_for_symtab: - symbols_offset = NONZERO_LINK_BASE (objfile->obfd); - break; - case adjust_for_symtab_restore: - symbols_offset = -NONZERO_LINK_BASE (objfile->obfd); - break; - case adjust_for_stabs: - case adjust_for_stabs_restore: - case adjust_for_dwarf: - case adjust_for_dwarf_restore: - default: - return; - } - - for (i = 0; i < objfile->num_sections; i++) - { - (objfile->section_offsets)->offsets[i] += symbols_offset; - } -} - -static int -i386_interix_pc_in_sigtramp (CORE_ADDR pc, char *name) -{ - /* This is sufficient, where used, but is NOT a complete test; There - is more in DEPRECATED_INIT_EXTRA_FRAME_INFO - (a.k.a. interix_back_one_frame). */ - return ((pc >= tramp_start && pc < tramp_end) - || (pc >= null_start && pc < null_end)); -} - -static int -i386_interix_in_solib_call_trampoline (CORE_ADDR pc, char *name) -{ - return i386_pe_skip_trampoline_code (pc, name); -} - -static CORE_ADDR -i386_interix_skip_trampoline_code (CORE_ADDR pc) -{ - return i386_pe_skip_trampoline_code (pc, 0); -} - -static int -i386_interix_frame_chain_valid (CORE_ADDR chain, struct frame_info *thisframe) -{ - /* In the context where this is used, we get the saved PC before we've - successfully unwound far enough to be sure what we've got (it may - be a signal handler caller). If we're dealing with a signal - handler caller, this will return valid, which is fine. If not, - it'll make the correct test. */ - return ((get_frame_type (thisframe) == SIGTRAMP_FRAME) - || (chain != 0 - && !deprecated_inside_entry_file (read_memory_integer - (thisframe->frame + 4, 4)))); -} - -/* We want to find the previous frame, which on Interix is tricky when - signals are involved; set frame->frame appropriately, and also get - the pc and tweak tye frame's type; this replaces a boatload of - nested macros, as well. */ -static void -i386_interix_back_one_frame (int fromleaf, struct frame_info *frame) -{ - CORE_ADDR ra; - CORE_ADDR fm; - CORE_ADDR context; - long t; - - if (frame == NULL) - internal_error (__FILE__, __LINE__, "unexpected NULL frame"); - - if (fromleaf) - { - frame->pc = DEPRECATED_SAVED_PC_AFTER_CALL (frame->next); - return; - } - - if (!frame->next) - { - frame->pc = read_pc (); - - /* Part of the signal stuff... See below. */ - if (stopped_by_random_signal) - { - /* We know we're in a system call mini-frame; was it - NullApi or something else? */ - ra = DEPRECATED_SAVED_PC_AFTER_CALL (frame); - if (ra >= null_start && ra < null_end) - deprecated_set_frame_type (frame, SIGTRAMP_FRAME); - /* There might also be an indirect call to the mini-frame, - putting one more return address on the stack. (XP only, - I think?) This can't (reasonably) return the address of the - signal handler caller unless it's that situation, so this - is safe. */ - ra = read_memory_unsigned_integer (read_register (SP_REGNUM) + 4, 4); - if (ra >= null_start && ra < null_end) - deprecated_set_frame_type (frame, SIGTRAMP_FRAME); - } - return; - } - - if (!(get_frame_type (frame->next) == SIGTRAMP_FRAME)) - { - frame->pc = read_memory_integer (frame->next->frame + 4, 4); - return; - } - - /* This is messy (actually AWFUL)... The "trampoline" might be 2, 3 - or all 5 entities on the frame. - - Chunk 1 will be present when we're actually in a signal handler. - Chunk 2 will be present when an asynchronous signal (one that - didn't come in with a system call) is present. - We may not (yet) be in the handler, if we're just returning - from the call. - When we're actually in a handler taken from an asynchronous - signal, both will be present. - - Chunk 1: - PdxSignalDeliverer's frame - + Context struct -- not accounted for in any frame - - Chunk 2: - + PdxNullPosixApi's frame - + PdxNullApiCaller's frame - + Context struct = 0x230 not accounted for in any frame - - The symbol names come from examining objdumps of psxdll.dll; - they don't appear in the runtime image. - - For gdb's purposes, we can pile all this into one frame. */ - - ra = frame->next->pc; - /* Are we already pointing at PdxNullPosixApi? We are if - this is a signal frame, we're at next-to-top, and were stopped - by a random signal (if it wasn't the right address under - these circumstances, we wouldn't be here at all by tests above - on the prior frame). */ - if (frame->next->next == NULL && stopped_by_random_signal) - { - /* We're pointing at the frame FOR PdxNullApi. */ - fm = frame->frame; - } - else - { - /* No... We must be pointing at the frame that was called - by PdxSignalDeliverer; back up across the whole mess. */ - - /* Extract the frame for PdxSignalDeliverer. Note: - DEPRECATED_FRAME_CHAIN used the "old" frame pointer because - we were a deliverer. Get the address of the context record - that's on here frameless. */ - context = read_memory_integer (frame->frame, 4); /* an Arg */ - - /* Now extract the frame pointer contained in the context. */ - fm = read_memory_integer (context + mcontext_EBP_greg_offset, 4); - - ra = read_memory_integer (context + mcontext_EIP_greg_offset, 4); - - /* We need to know if we're in a system call because we'll be - in a syscall mini-frame, if so, and the rules are different. */ - t = (long) read_memory_integer (context + mcontext_syscall_greg_offset, - 4); - /* t contains 0 if running free, 1 if blocked on a system call, - and 2 if blocked on an exception message (e.g. a trap); - we don't expect to get here with a 2. */ - if (t != 1) - { - /* Not at a system call, therefore it can't be NullApi. */ - frame->pc = ra; - frame->frame = fm; - return; - } - - /* It's a system call... Mini frame, then look for NullApi. */ - /* Get the RA (on the stack) associated with this... It's - a system call mini-frame. */ - ra = read_memory_integer (context + mcontext_UESP_greg_offset, 4); - - if (winver >= 51) - { - /* Newer versions of Windows NT interpose another return - address (but no other "stack frame" stuff) that we need - to simply ignore here. */ - ra += 4; - } - - ra = read_memory_integer (ra, 4); - - if (!(ra >= null_start && ra < null_end)) - { - /* No Null API present; we're done. */ - frame->pc = ra; - frame->frame = fm; - return; - } - } - - /* At this point, we're looking at the frame for PdxNullPosixApi, - in either case. - - PdxNullPosixApi is called by PdxNullApiCaller (which in turn - is called by _PdxNullApiCaller (note the _).) - PdxNullPosixApiCaller (no _) is a frameless function. - - The saved frame pointer is as fm, but it's not of interest - to us because it skips us over the saved context, which is - the wrong thing to do, because it skips the interrrupted - routine! PdxNullApiCaller takes as its only argument the - address of the context of the interrupded function (which - is really in no frame, but jammed on the stack by the system) - - So: fm+0: saved bp - fm+4: return address to _PdxNullApiCaller - fm+8: arg to PdxNullApiCaller pushed by _Pdx... */ - - fm = read_memory_integer (fm + 0x8, 4); - - /* Extract the second context record. */ - - ra = read_memory_integer (fm + mcontext_EIP_greg_offset, 4); - fm = read_memory_integer (fm + mcontext_EBP_greg_offset, 4); - - frame->frame = fm; - frame->pc = ra; - - return; -} - -static CORE_ADDR -i386_interix_frame_saved_pc (struct frame_info *fi) -{ - /* Assume that we've already unwound enough to have the caller's address - if we're dealing with a signal handler caller (And if that fails, - return 0). */ - if ((get_frame_type (fi) == SIGTRAMP_FRAME)) - return fi->next ? fi->next->pc : 0; - else - return read_memory_integer (fi->frame + 4, 4); -} - -static void -i386_interix_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) -{ - struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); - - tdep->struct_return = reg_struct_return; - tdep->jb_pc_offset = jump_buffer_Eip_offset; - - set_gdbarch_pc_in_sigtramp (gdbarch, i386_interix_pc_in_sigtramp); - set_gdbarch_in_solib_call_trampoline (gdbarch, - i386_interix_in_solib_call_trampoline); - set_gdbarch_skip_trampoline_code (gdbarch, - i386_interix_skip_trampoline_code); - set_gdbarch_deprecated_init_extra_frame_info (gdbarch, i386_interix_back_one_frame); - set_gdbarch_deprecated_frame_chain_valid (gdbarch, i386_interix_frame_chain_valid); - set_gdbarch_deprecated_frame_saved_pc (gdbarch, i386_interix_frame_saved_pc); - set_gdbarch_name_of_malloc (gdbarch, "_malloc"); -} - -static enum gdb_osabi -i386_interix_osabi_sniffer (bfd * abfd) -{ - char *target_name = bfd_get_target (abfd); - - if (strcmp (target_name, "pei-i386") == 0) - return GDB_OSABI_INTERIX; - - return GDB_OSABI_UNKNOWN; -} - -void -_initialize_i386_interix_tdep (void) -{ - gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_coff_flavour, - i386_interix_osabi_sniffer); - - gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_INTERIX, - i386_interix_init_abi); -} |