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dda83cd783
Many spots incorrectly use only spaces for indentation (for example, there are a lot of spots in ada-lang.c). I've always found it awkward when I needed to edit one of these spots: do I keep the original wrong indentation, or do I fix it? What if the lines around it are also wrong, do I fix them too? I probably don't want to fix them in the same patch, to avoid adding noise to my patch. So I propose to fix as much as possible once and for all (hopefully). One typical counter argument for this is that it makes code archeology more difficult, because git-blame will show this commit as the last change for these lines. My counter counter argument is: when git-blaming, you often need to do "blame the file at the parent commit" anyway, to go past some other refactor that touched the line you are interested in, but is not the change you are looking for. So you already need a somewhat efficient way to do this. Using some interactive tool, rather than plain git-blame, makes this trivial. For example, I use "tig blame <file>", where going back past the commit that changed the currently selected line is one keystroke. It looks like Magit in Emacs does it too (though I've never used it). Web viewers of Github and Gitlab do it too. My point is that it won't really make archeology more difficult. The other typical counter argument is that it will cause conflicts with existing patches. That's true... but it's a one time cost, and those are not conflicts that are difficult to resolve. I have also tried "git rebase --ignore-whitespace", it seems to work well. Although that will re-introduce the faulty indentation, so one needs to take care of fixing the indentation in the patch after that (which is easy). gdb/ChangeLog: * aarch64-linux-tdep.c: Fix indentation. * aarch64-ravenscar-thread.c: Fix indentation. * aarch64-tdep.c: Fix indentation. * aarch64-tdep.h: Fix indentation. * ada-lang.c: Fix indentation. * ada-lang.h: Fix indentation. * ada-tasks.c: Fix indentation. * ada-typeprint.c: Fix indentation. * ada-valprint.c: Fix indentation. * ada-varobj.c: Fix indentation. * addrmap.c: Fix indentation. * addrmap.h: Fix indentation. * agent.c: Fix indentation. * aix-thread.c: Fix indentation. * alpha-bsd-nat.c: Fix indentation. * alpha-linux-tdep.c: Fix indentation. * alpha-mdebug-tdep.c: Fix indentation. * alpha-nbsd-tdep.c: Fix indentation. * alpha-obsd-tdep.c: Fix indentation. * alpha-tdep.c: Fix indentation. * amd64-bsd-nat.c: Fix indentation. * amd64-darwin-tdep.c: Fix indentation. * amd64-linux-nat.c: Fix indentation. * amd64-linux-tdep.c: Fix indentation. * amd64-nat.c: Fix indentation. * amd64-obsd-tdep.c: Fix indentation. * amd64-tdep.c: Fix indentation. * amd64-windows-tdep.c: Fix indentation. * annotate.c: Fix indentation. * arc-tdep.c: Fix indentation. * arch-utils.c: Fix indentation. * arch/arm-get-next-pcs.c: Fix indentation. * arch/arm.c: Fix indentation. * arm-linux-nat.c: Fix indentation. * arm-linux-tdep.c: Fix indentation. * arm-nbsd-tdep.c: Fix indentation. * arm-pikeos-tdep.c: Fix indentation. * arm-tdep.c: Fix indentation. * arm-tdep.h: Fix indentation. * arm-wince-tdep.c: Fix indentation. * auto-load.c: Fix indentation. * auxv.c: Fix indentation. * avr-tdep.c: Fix indentation. * ax-gdb.c: Fix indentation. * ax-general.c: Fix indentation. * bfin-linux-tdep.c: Fix indentation. * block.c: Fix indentation. * block.h: Fix indentation. * blockframe.c: Fix indentation. * bpf-tdep.c: Fix indentation. * break-catch-sig.c: Fix indentation. * break-catch-syscall.c: Fix indentation. * break-catch-throw.c: Fix indentation. * breakpoint.c: Fix indentation. * breakpoint.h: Fix indentation. * bsd-uthread.c: Fix indentation. * btrace.c: Fix indentation. * build-id.c: Fix indentation. * buildsym-legacy.h: Fix indentation. * buildsym.c: Fix indentation. * c-typeprint.c: Fix indentation. * c-valprint.c: Fix indentation. * c-varobj.c: Fix indentation. * charset.c: Fix indentation. * cli/cli-cmds.c: Fix indentation. * cli/cli-decode.c: Fix indentation. * cli/cli-decode.h: Fix indentation. * cli/cli-script.c: Fix indentation. * cli/cli-setshow.c: Fix indentation. * coff-pe-read.c: Fix indentation. * coffread.c: Fix indentation. * compile/compile-cplus-types.c: Fix indentation. * compile/compile-object-load.c: Fix indentation. * compile/compile-object-run.c: Fix indentation. * completer.c: Fix indentation. * corefile.c: Fix indentation. * corelow.c: Fix indentation. * cp-abi.h: Fix indentation. * cp-namespace.c: Fix indentation. * cp-support.c: Fix indentation. * cp-valprint.c: Fix indentation. * cris-linux-tdep.c: Fix indentation. * cris-tdep.c: Fix indentation. * darwin-nat-info.c: Fix indentation. * darwin-nat.c: Fix indentation. * darwin-nat.h: Fix indentation. * dbxread.c: Fix indentation. * dcache.c: Fix indentation. * disasm.c: Fix indentation. * dtrace-probe.c: Fix indentation. * dwarf2/abbrev.c: Fix indentation. * dwarf2/attribute.c: Fix indentation. * dwarf2/expr.c: Fix indentation. * dwarf2/frame.c: Fix indentation. * dwarf2/index-cache.c: Fix indentation. * dwarf2/index-write.c: Fix indentation. * dwarf2/line-header.c: Fix indentation. * dwarf2/loc.c: Fix indentation. * dwarf2/macro.c: Fix indentation. * dwarf2/read.c: Fix indentation. * dwarf2/read.h: Fix indentation. * elfread.c: Fix indentation. * eval.c: Fix indentation. * event-top.c: Fix indentation. * exec.c: Fix indentation. * exec.h: Fix indentation. * expprint.c: Fix indentation. * f-lang.c: Fix indentation. * f-typeprint.c: Fix indentation. * f-valprint.c: Fix indentation. * fbsd-nat.c: Fix indentation. * fbsd-tdep.c: Fix indentation. * findvar.c: Fix indentation. * fork-child.c: Fix indentation. * frame-unwind.c: Fix indentation. * frame-unwind.h: Fix indentation. * frame.c: Fix indentation. * frv-linux-tdep.c: Fix indentation. * frv-tdep.c: Fix indentation. * frv-tdep.h: Fix indentation. * ft32-tdep.c: Fix indentation. * gcore.c: Fix indentation. * gdb_bfd.c: Fix indentation. * gdbarch.sh: Fix indentation. * gdbarch.c: Re-generate * gdbarch.h: Re-generate. * gdbcore.h: Fix indentation. * gdbthread.h: Fix indentation. * gdbtypes.c: Fix indentation. * gdbtypes.h: Fix indentation. * glibc-tdep.c: Fix indentation. * gnu-nat.c: Fix indentation. * gnu-nat.h: Fix indentation. * gnu-v2-abi.c: Fix indentation. * gnu-v3-abi.c: Fix indentation. * go32-nat.c: Fix indentation. * guile/guile-internal.h: Fix indentation. * guile/scm-cmd.c: Fix indentation. * guile/scm-frame.c: Fix indentation. * guile/scm-iterator.c: Fix indentation. * guile/scm-math.c: Fix indentation. * guile/scm-ports.c: Fix indentation. * guile/scm-pretty-print.c: Fix indentation. * guile/scm-value.c: Fix indentation. * h8300-tdep.c: Fix indentation. * hppa-linux-nat.c: Fix indentation. * hppa-linux-tdep.c: Fix indentation. * hppa-nbsd-nat.c: Fix indentation. * hppa-nbsd-tdep.c: Fix indentation. * hppa-obsd-nat.c: Fix indentation. * hppa-tdep.c: Fix indentation. * hppa-tdep.h: Fix indentation. * i386-bsd-nat.c: Fix indentation. * i386-darwin-nat.c: Fix indentation. * i386-darwin-tdep.c: Fix indentation. * i386-dicos-tdep.c: Fix indentation. * i386-gnu-nat.c: Fix indentation. * i386-linux-nat.c: Fix indentation. * i386-linux-tdep.c: Fix indentation. * i386-nto-tdep.c: Fix indentation. * i386-obsd-tdep.c: Fix indentation. * i386-sol2-nat.c: Fix indentation. * i386-tdep.c: Fix indentation. * i386-tdep.h: Fix indentation. * i386-windows-tdep.c: Fix indentation. * i387-tdep.c: Fix indentation. * i387-tdep.h: Fix indentation. * ia64-libunwind-tdep.c: Fix indentation. * ia64-libunwind-tdep.h: Fix indentation. * ia64-linux-nat.c: Fix indentation. * ia64-linux-tdep.c: Fix indentation. * ia64-tdep.c: Fix indentation. * ia64-tdep.h: Fix indentation. * ia64-vms-tdep.c: Fix indentation. * infcall.c: Fix indentation. * infcmd.c: Fix indentation. * inferior.c: Fix indentation. * infrun.c: Fix indentation. * iq2000-tdep.c: Fix indentation. * language.c: Fix indentation. * linespec.c: Fix indentation. * linux-fork.c: Fix indentation. * linux-nat.c: Fix indentation. * linux-tdep.c: Fix indentation. * linux-thread-db.c: Fix indentation. * lm32-tdep.c: Fix indentation. * m2-lang.c: Fix indentation. * m2-typeprint.c: Fix indentation. * m2-valprint.c: Fix indentation. * m32c-tdep.c: Fix indentation. * m32r-linux-tdep.c: Fix indentation. * m32r-tdep.c: Fix indentation. * m68hc11-tdep.c: Fix indentation. * m68k-bsd-nat.c: Fix indentation. * m68k-linux-nat.c: Fix indentation. * m68k-linux-tdep.c: Fix indentation. * m68k-tdep.c: Fix indentation. * machoread.c: Fix indentation. * macrocmd.c: Fix indentation. * macroexp.c: Fix indentation. * macroscope.c: Fix indentation. * macrotab.c: Fix indentation. * macrotab.h: Fix indentation. * main.c: Fix indentation. * mdebugread.c: Fix indentation. * mep-tdep.c: Fix indentation. * mi/mi-cmd-catch.c: Fix indentation. * mi/mi-cmd-disas.c: Fix indentation. * mi/mi-cmd-env.c: Fix indentation. * mi/mi-cmd-stack.c: Fix indentation. * mi/mi-cmd-var.c: Fix indentation. * mi/mi-cmds.c: Fix indentation. * mi/mi-main.c: Fix indentation. * mi/mi-parse.c: Fix indentation. * microblaze-tdep.c: Fix indentation. * minidebug.c: Fix indentation. * minsyms.c: Fix indentation. * mips-linux-nat.c: Fix indentation. * mips-linux-tdep.c: Fix indentation. * mips-nbsd-tdep.c: Fix indentation. * mips-tdep.c: Fix indentation. * mn10300-linux-tdep.c: Fix indentation. * mn10300-tdep.c: Fix indentation. * moxie-tdep.c: Fix indentation. * msp430-tdep.c: Fix indentation. * namespace.h: Fix indentation. * nat/fork-inferior.c: Fix indentation. * nat/gdb_ptrace.h: Fix indentation. * nat/linux-namespaces.c: Fix indentation. * nat/linux-osdata.c: Fix indentation. * nat/netbsd-nat.c: Fix indentation. * nat/x86-dregs.c: Fix indentation. * nbsd-nat.c: Fix indentation. * nbsd-tdep.c: Fix indentation. * nios2-linux-tdep.c: Fix indentation. * nios2-tdep.c: Fix indentation. * nto-procfs.c: Fix indentation. * nto-tdep.c: Fix indentation. * objfiles.c: Fix indentation. * objfiles.h: Fix indentation. * opencl-lang.c: Fix indentation. * or1k-tdep.c: Fix indentation. * osabi.c: Fix indentation. * osabi.h: Fix indentation. * osdata.c: Fix indentation. * p-lang.c: Fix indentation. * p-typeprint.c: Fix indentation. * p-valprint.c: Fix indentation. * parse.c: Fix indentation. * ppc-linux-nat.c: Fix indentation. * ppc-linux-tdep.c: Fix indentation. * ppc-nbsd-nat.c: Fix indentation. * ppc-nbsd-tdep.c: Fix indentation. * ppc-obsd-nat.c: Fix indentation. * ppc-ravenscar-thread.c: Fix indentation. * ppc-sysv-tdep.c: Fix indentation. * ppc64-tdep.c: Fix indentation. * printcmd.c: Fix indentation. * proc-api.c: Fix indentation. * producer.c: Fix indentation. * producer.h: Fix indentation. * prologue-value.c: Fix indentation. * prologue-value.h: Fix indentation. * psymtab.c: Fix indentation. * python/py-arch.c: Fix indentation. * python/py-bpevent.c: Fix indentation. * python/py-event.c: Fix indentation. * python/py-event.h: Fix indentation. * python/py-finishbreakpoint.c: Fix indentation. * python/py-frame.c: Fix indentation. * python/py-framefilter.c: Fix indentation. * python/py-inferior.c: Fix indentation. * python/py-infthread.c: Fix indentation. * python/py-objfile.c: Fix indentation. * python/py-prettyprint.c: Fix indentation. * python/py-registers.c: Fix indentation. * python/py-signalevent.c: Fix indentation. * python/py-stopevent.c: Fix indentation. * python/py-stopevent.h: Fix indentation. * python/py-threadevent.c: Fix indentation. * python/py-tui.c: Fix indentation. * python/py-unwind.c: Fix indentation. * python/py-value.c: Fix indentation. * python/py-xmethods.c: Fix indentation. * python/python-internal.h: Fix indentation. * python/python.c: Fix indentation. * ravenscar-thread.c: Fix indentation. * record-btrace.c: Fix indentation. * record-full.c: Fix indentation. * record.c: Fix indentation. * reggroups.c: Fix indentation. * regset.h: Fix indentation. * remote-fileio.c: Fix indentation. * remote.c: Fix indentation. * reverse.c: Fix indentation. * riscv-linux-tdep.c: Fix indentation. * riscv-ravenscar-thread.c: Fix indentation. * riscv-tdep.c: Fix indentation. * rl78-tdep.c: Fix indentation. * rs6000-aix-tdep.c: Fix indentation. * rs6000-lynx178-tdep.c: Fix indentation. * rs6000-nat.c: Fix indentation. * rs6000-tdep.c: Fix indentation. * rust-lang.c: Fix indentation. * rx-tdep.c: Fix indentation. * s12z-tdep.c: Fix indentation. * s390-linux-tdep.c: Fix indentation. * score-tdep.c: Fix indentation. * ser-base.c: Fix indentation. * ser-mingw.c: Fix indentation. * ser-uds.c: Fix indentation. * ser-unix.c: Fix indentation. * serial.c: Fix indentation. * sh-linux-tdep.c: Fix indentation. * sh-nbsd-tdep.c: Fix indentation. * sh-tdep.c: Fix indentation. * skip.c: Fix indentation. * sol-thread.c: Fix indentation. * solib-aix.c: Fix indentation. * solib-darwin.c: Fix indentation. * solib-frv.c: Fix indentation. * solib-svr4.c: Fix indentation. * solib.c: Fix indentation. * source.c: Fix indentation. * sparc-linux-tdep.c: Fix indentation. * sparc-nbsd-tdep.c: Fix indentation. * sparc-obsd-tdep.c: Fix indentation. * sparc-ravenscar-thread.c: Fix indentation. * sparc-tdep.c: Fix indentation. * sparc64-linux-tdep.c: Fix indentation. * sparc64-nbsd-tdep.c: Fix indentation. * sparc64-obsd-tdep.c: Fix indentation. * sparc64-tdep.c: Fix indentation. * stabsread.c: Fix indentation. * stack.c: Fix indentation. * stap-probe.c: Fix indentation. * stubs/ia64vms-stub.c: Fix indentation. * stubs/m32r-stub.c: Fix indentation. * stubs/m68k-stub.c: Fix indentation. * stubs/sh-stub.c: Fix indentation. * stubs/sparc-stub.c: Fix indentation. * symfile-mem.c: Fix indentation. * symfile.c: Fix indentation. * symfile.h: Fix indentation. * symmisc.c: Fix indentation. * symtab.c: Fix indentation. * symtab.h: Fix indentation. * target-float.c: Fix indentation. * target.c: Fix indentation. * target.h: Fix indentation. * tic6x-tdep.c: Fix indentation. * tilegx-linux-tdep.c: Fix indentation. * tilegx-tdep.c: Fix indentation. * top.c: Fix indentation. * tracefile-tfile.c: Fix indentation. * tracepoint.c: Fix indentation. * tui/tui-disasm.c: Fix indentation. * tui/tui-io.c: Fix indentation. * tui/tui-regs.c: Fix indentation. * tui/tui-stack.c: Fix indentation. * tui/tui-win.c: Fix indentation. * tui/tui-winsource.c: Fix indentation. * tui/tui.c: Fix indentation. * typeprint.c: Fix indentation. * ui-out.h: Fix indentation. * unittests/copy_bitwise-selftests.c: Fix indentation. * unittests/memory-map-selftests.c: Fix indentation. * utils.c: Fix indentation. * v850-tdep.c: Fix indentation. * valarith.c: Fix indentation. * valops.c: Fix indentation. * valprint.c: Fix indentation. * valprint.h: Fix indentation. * value.c: Fix indentation. * value.h: Fix indentation. * varobj.c: Fix indentation. * vax-tdep.c: Fix indentation. * windows-nat.c: Fix indentation. * windows-tdep.c: Fix indentation. * xcoffread.c: Fix indentation. * xml-syscall.c: Fix indentation. * xml-tdesc.c: Fix indentation. * xstormy16-tdep.c: Fix indentation. * xtensa-config.c: Fix indentation. * xtensa-linux-nat.c: Fix indentation. * xtensa-linux-tdep.c: Fix indentation. * xtensa-tdep.c: Fix indentation. gdbserver/ChangeLog: * ax.cc: Fix indentation. * dll.cc: Fix indentation. * inferiors.h: Fix indentation. * linux-low.cc: Fix indentation. * linux-nios2-low.cc: Fix indentation. * linux-ppc-ipa.cc: Fix indentation. * linux-ppc-low.cc: Fix indentation. * linux-x86-low.cc: Fix indentation. * linux-xtensa-low.cc: Fix indentation. * regcache.cc: Fix indentation. * server.cc: Fix indentation. * tracepoint.cc: Fix indentation. gdbsupport/ChangeLog: * common-exceptions.h: Fix indentation. * event-loop.cc: Fix indentation. * fileio.cc: Fix indentation. * filestuff.cc: Fix indentation. * gdb-dlfcn.cc: Fix indentation. * gdb_string_view.h: Fix indentation. * job-control.cc: Fix indentation. * signals.cc: Fix indentation. Change-Id: I4bad7ae6be0fbe14168b8ebafb98ffe14964a695
453 lines
13 KiB
C
453 lines
13 KiB
C
/* Target-dependent code for OpenBSD/i386.
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Copyright (C) 1988-2020 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "arch-utils.h"
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#include "frame.h"
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#include "frame-unwind.h"
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#include "gdbcore.h"
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#include "regcache.h"
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#include "regset.h"
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#include "symtab.h"
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#include "objfiles.h"
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#include "osabi.h"
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#include "target.h"
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#include "trad-frame.h"
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#include "obsd-tdep.h"
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#include "i386-tdep.h"
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#include "i387-tdep.h"
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#include "solib-svr4.h"
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#include "bsd-uthread.h"
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/* Support for signal handlers. */
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/* Since OpenBSD 3.2, the sigtramp routine is mapped at a random page
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in virtual memory. The randomness makes it somewhat tricky to
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detect it, but fortunately we can rely on the fact that the start
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of the sigtramp routine is page-aligned. We recognize the
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trampoline by looking for the code that invokes the sigreturn
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system call. The offset where we can find that code varies from
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release to release.
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By the way, the mapping mentioned above is read-only, so you cannot
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place a breakpoint in the signal trampoline. */
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/* Default page size. */
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static const int i386obsd_page_size = 4096;
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/* Offset for sigreturn(2). */
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static const int i386obsd_sigreturn_offset[] = {
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0x0a, /* OpenBSD 3.2 */
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0x14, /* OpenBSD 3.6 */
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0x3a, /* OpenBSD 3.8 */
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-1
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};
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/* Return whether THIS_FRAME corresponds to an OpenBSD sigtramp
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routine. */
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static int
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i386obsd_sigtramp_p (struct frame_info *this_frame)
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{
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CORE_ADDR pc = get_frame_pc (this_frame);
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CORE_ADDR start_pc = (pc & ~(i386obsd_page_size - 1));
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/* The call sequence invoking sigreturn(2). */
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const gdb_byte sigreturn[] =
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{
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0xb8,
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0x67, 0x00, 0x00, 0x00, /* movl $SYS_sigreturn, %eax */
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0xcd, 0x80 /* int $0x80 */
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};
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size_t buflen = sizeof sigreturn;
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const int *offset;
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gdb_byte *buf;
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const char *name;
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/* If the function has a valid symbol name, it isn't a
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trampoline. */
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find_pc_partial_function (pc, &name, NULL, NULL);
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if (name != NULL)
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return 0;
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/* If the function lives in a valid section (even without a starting
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point) it isn't a trampoline. */
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if (find_pc_section (pc) != NULL)
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return 0;
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/* Allocate buffer. */
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buf = (gdb_byte *) alloca (buflen);
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/* Loop over all offsets. */
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for (offset = i386obsd_sigreturn_offset; *offset != -1; offset++)
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{
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/* If we can't read the instructions, return zero. */
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if (!safe_frame_unwind_memory (this_frame, start_pc + *offset,
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buf, buflen))
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return 0;
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/* Check for sigreturn(2). */
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if (memcmp (buf, sigreturn, buflen) == 0)
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return 1;
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}
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return 0;
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}
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/* Mapping between the general-purpose registers in `struct reg'
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format and GDB's register cache layout. */
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/* From <machine/reg.h>. */
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static int i386obsd_r_reg_offset[] =
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{
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0 * 4, /* %eax */
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1 * 4, /* %ecx */
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2 * 4, /* %edx */
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3 * 4, /* %ebx */
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4 * 4, /* %esp */
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5 * 4, /* %ebp */
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6 * 4, /* %esi */
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7 * 4, /* %edi */
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8 * 4, /* %eip */
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9 * 4, /* %eflags */
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10 * 4, /* %cs */
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11 * 4, /* %ss */
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12 * 4, /* %ds */
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13 * 4, /* %es */
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14 * 4, /* %fs */
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15 * 4 /* %gs */
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};
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/* Sigtramp routine location for OpenBSD 3.1 and earlier releases. */
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CORE_ADDR i386obsd_sigtramp_start_addr = 0xbfbfdf20;
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CORE_ADDR i386obsd_sigtramp_end_addr = 0xbfbfdff0;
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/* From <machine/signal.h>. */
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int i386obsd_sc_reg_offset[I386_NUM_GREGS] =
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{
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10 * 4, /* %eax */
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9 * 4, /* %ecx */
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8 * 4, /* %edx */
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7 * 4, /* %ebx */
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14 * 4, /* %esp */
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6 * 4, /* %ebp */
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5 * 4, /* %esi */
|
||
4 * 4, /* %edi */
|
||
11 * 4, /* %eip */
|
||
13 * 4, /* %eflags */
|
||
12 * 4, /* %cs */
|
||
15 * 4, /* %ss */
|
||
3 * 4, /* %ds */
|
||
2 * 4, /* %es */
|
||
1 * 4, /* %fs */
|
||
0 * 4 /* %gs */
|
||
};
|
||
|
||
/* From /usr/src/lib/libpthread/arch/i386/uthread_machdep.c. */
|
||
static int i386obsd_uthread_reg_offset[] =
|
||
{
|
||
11 * 4, /* %eax */
|
||
10 * 4, /* %ecx */
|
||
9 * 4, /* %edx */
|
||
8 * 4, /* %ebx */
|
||
-1, /* %esp */
|
||
6 * 4, /* %ebp */
|
||
5 * 4, /* %esi */
|
||
4 * 4, /* %edi */
|
||
12 * 4, /* %eip */
|
||
-1, /* %eflags */
|
||
13 * 4, /* %cs */
|
||
-1, /* %ss */
|
||
3 * 4, /* %ds */
|
||
2 * 4, /* %es */
|
||
1 * 4, /* %fs */
|
||
0 * 4 /* %gs */
|
||
};
|
||
|
||
/* Offset within the thread structure where we can find the saved
|
||
stack pointer (%esp). */
|
||
#define I386OBSD_UTHREAD_ESP_OFFSET 176
|
||
|
||
static void
|
||
i386obsd_supply_uthread (struct regcache *regcache,
|
||
int regnum, CORE_ADDR addr)
|
||
{
|
||
struct gdbarch *gdbarch = regcache->arch ();
|
||
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
|
||
CORE_ADDR sp_addr = addr + I386OBSD_UTHREAD_ESP_OFFSET;
|
||
CORE_ADDR sp = 0;
|
||
gdb_byte buf[4];
|
||
int i;
|
||
|
||
gdb_assert (regnum >= -1);
|
||
|
||
if (regnum == -1 || regnum == I386_ESP_REGNUM)
|
||
{
|
||
int offset;
|
||
|
||
/* Fetch stack pointer from thread structure. */
|
||
sp = read_memory_unsigned_integer (sp_addr, 4, byte_order);
|
||
|
||
/* Adjust the stack pointer such that it looks as if we just
|
||
returned from _thread_machdep_switch. */
|
||
offset = i386obsd_uthread_reg_offset[I386_EIP_REGNUM] + 4;
|
||
store_unsigned_integer (buf, 4, byte_order, sp + offset);
|
||
regcache->raw_supply (I386_ESP_REGNUM, buf);
|
||
}
|
||
|
||
for (i = 0; i < ARRAY_SIZE (i386obsd_uthread_reg_offset); i++)
|
||
{
|
||
if (i386obsd_uthread_reg_offset[i] != -1
|
||
&& (regnum == -1 || regnum == i))
|
||
{
|
||
/* Fetch stack pointer from thread structure (if we didn't
|
||
do so already). */
|
||
if (sp == 0)
|
||
sp = read_memory_unsigned_integer (sp_addr, 4, byte_order);
|
||
|
||
/* Read the saved register from the stack frame. */
|
||
read_memory (sp + i386obsd_uthread_reg_offset[i], buf, 4);
|
||
regcache->raw_supply (i, buf);
|
||
}
|
||
}
|
||
}
|
||
|
||
static void
|
||
i386obsd_collect_uthread (const struct regcache *regcache,
|
||
int regnum, CORE_ADDR addr)
|
||
{
|
||
struct gdbarch *gdbarch = regcache->arch ();
|
||
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
|
||
CORE_ADDR sp_addr = addr + I386OBSD_UTHREAD_ESP_OFFSET;
|
||
CORE_ADDR sp = 0;
|
||
gdb_byte buf[4];
|
||
int i;
|
||
|
||
gdb_assert (regnum >= -1);
|
||
|
||
if (regnum == -1 || regnum == I386_ESP_REGNUM)
|
||
{
|
||
int offset;
|
||
|
||
/* Calculate the stack pointer (frame pointer) that will be
|
||
stored into the thread structure. */
|
||
offset = i386obsd_uthread_reg_offset[I386_EIP_REGNUM] + 4;
|
||
regcache->raw_collect (I386_ESP_REGNUM, buf);
|
||
sp = extract_unsigned_integer (buf, 4, byte_order) - offset;
|
||
|
||
/* Store the stack pointer. */
|
||
write_memory_unsigned_integer (sp_addr, 4, byte_order, sp);
|
||
|
||
/* The stack pointer was (potentially) modified. Make sure we
|
||
build a proper stack frame. */
|
||
regnum = -1;
|
||
}
|
||
|
||
for (i = 0; i < ARRAY_SIZE (i386obsd_uthread_reg_offset); i++)
|
||
{
|
||
if (i386obsd_uthread_reg_offset[i] != -1
|
||
&& (regnum == -1 || regnum == i))
|
||
{
|
||
/* Fetch stack pointer from thread structure (if we didn't
|
||
calculate it already). */
|
||
if (sp == 0)
|
||
sp = read_memory_unsigned_integer (sp_addr, 4, byte_order);
|
||
|
||
/* Write the register into the stack frame. */
|
||
regcache->raw_collect (i, buf);
|
||
write_memory (sp + i386obsd_uthread_reg_offset[i], buf, 4);
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Kernel debugging support. */
|
||
|
||
/* From <machine/frame.h>. Note that %esp and %ess are only saved in
|
||
a trap frame when entering the kernel from user space. */
|
||
static int i386obsd_tf_reg_offset[] =
|
||
{
|
||
10 * 4, /* %eax */
|
||
9 * 4, /* %ecx */
|
||
8 * 4, /* %edx */
|
||
7 * 4, /* %ebx */
|
||
-1, /* %esp */
|
||
6 * 4, /* %ebp */
|
||
5 * 4, /* %esi */
|
||
4 * 4, /* %edi */
|
||
13 * 4, /* %eip */
|
||
15 * 4, /* %eflags */
|
||
14 * 4, /* %cs */
|
||
-1, /* %ss */
|
||
3 * 4, /* %ds */
|
||
2 * 4, /* %es */
|
||
0 * 4, /* %fs */
|
||
1 * 4 /* %gs */
|
||
};
|
||
|
||
static struct trad_frame_cache *
|
||
i386obsd_trapframe_cache (struct frame_info *this_frame, void **this_cache)
|
||
{
|
||
struct gdbarch *gdbarch = get_frame_arch (this_frame);
|
||
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
|
||
struct trad_frame_cache *cache;
|
||
CORE_ADDR func, sp, addr;
|
||
ULONGEST cs;
|
||
const char *name;
|
||
int i;
|
||
|
||
if (*this_cache)
|
||
return (struct trad_frame_cache *) *this_cache;
|
||
|
||
cache = trad_frame_cache_zalloc (this_frame);
|
||
*this_cache = cache;
|
||
|
||
func = get_frame_func (this_frame);
|
||
sp = get_frame_register_unsigned (this_frame, I386_ESP_REGNUM);
|
||
|
||
find_pc_partial_function (func, &name, NULL, NULL);
|
||
if (name && startswith (name, "Xintr"))
|
||
addr = sp + 8; /* It's an interrupt frame. */
|
||
else
|
||
addr = sp;
|
||
|
||
for (i = 0; i < ARRAY_SIZE (i386obsd_tf_reg_offset); i++)
|
||
if (i386obsd_tf_reg_offset[i] != -1)
|
||
trad_frame_set_reg_addr (cache, i, addr + i386obsd_tf_reg_offset[i]);
|
||
|
||
/* Read %cs from trap frame. */
|
||
addr += i386obsd_tf_reg_offset[I386_CS_REGNUM];
|
||
cs = read_memory_unsigned_integer (addr, 4, byte_order);
|
||
if ((cs & I386_SEL_RPL) == I386_SEL_UPL)
|
||
{
|
||
/* Trap from user space; terminate backtrace. */
|
||
trad_frame_set_id (cache, outer_frame_id);
|
||
}
|
||
else
|
||
{
|
||
/* Construct the frame ID using the function start. */
|
||
trad_frame_set_id (cache, frame_id_build (sp + 8, func));
|
||
}
|
||
|
||
return cache;
|
||
}
|
||
|
||
static void
|
||
i386obsd_trapframe_this_id (struct frame_info *this_frame,
|
||
void **this_cache, struct frame_id *this_id)
|
||
{
|
||
struct trad_frame_cache *cache =
|
||
i386obsd_trapframe_cache (this_frame, this_cache);
|
||
|
||
trad_frame_get_id (cache, this_id);
|
||
}
|
||
|
||
static struct value *
|
||
i386obsd_trapframe_prev_register (struct frame_info *this_frame,
|
||
void **this_cache, int regnum)
|
||
{
|
||
struct trad_frame_cache *cache =
|
||
i386obsd_trapframe_cache (this_frame, this_cache);
|
||
|
||
return trad_frame_get_register (cache, this_frame, regnum);
|
||
}
|
||
|
||
static int
|
||
i386obsd_trapframe_sniffer (const struct frame_unwind *self,
|
||
struct frame_info *this_frame,
|
||
void **this_prologue_cache)
|
||
{
|
||
ULONGEST cs;
|
||
const char *name;
|
||
|
||
/* Check Current Privilege Level and bail out if we're not executing
|
||
in kernel space. */
|
||
cs = get_frame_register_unsigned (this_frame, I386_CS_REGNUM);
|
||
if ((cs & I386_SEL_RPL) == I386_SEL_UPL)
|
||
return 0;
|
||
|
||
find_pc_partial_function (get_frame_pc (this_frame), &name, NULL, NULL);
|
||
return (name && (strcmp (name, "calltrap") == 0
|
||
|| strcmp (name, "syscall1") == 0
|
||
|| startswith (name, "Xintr")
|
||
|| startswith (name, "Xsoft")));
|
||
}
|
||
|
||
static const struct frame_unwind i386obsd_trapframe_unwind = {
|
||
/* FIXME: kettenis/20051219: This really is more like an interrupt
|
||
frame, but SIGTRAMP_FRAME would print <signal handler called>,
|
||
which really is not what we want here. */
|
||
NORMAL_FRAME,
|
||
default_frame_unwind_stop_reason,
|
||
i386obsd_trapframe_this_id,
|
||
i386obsd_trapframe_prev_register,
|
||
NULL,
|
||
i386obsd_trapframe_sniffer
|
||
};
|
||
|
||
|
||
static void
|
||
i386obsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
|
||
{
|
||
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
|
||
|
||
/* Obviously OpenBSD is BSD-based. */
|
||
i386bsd_init_abi (info, gdbarch);
|
||
obsd_init_abi (info, gdbarch);
|
||
i386_elf_init_abi (info, gdbarch);
|
||
|
||
/* OpenBSD has a different `struct reg'. */
|
||
tdep->gregset_reg_offset = i386obsd_r_reg_offset;
|
||
tdep->gregset_num_regs = ARRAY_SIZE (i386obsd_r_reg_offset);
|
||
tdep->sizeof_gregset = 16 * 4;
|
||
|
||
/* OpenBSD uses -freg-struct-return by default. */
|
||
tdep->struct_return = reg_struct_return;
|
||
|
||
/* OpenBSD uses a different memory layout. */
|
||
tdep->sigtramp_start = i386obsd_sigtramp_start_addr;
|
||
tdep->sigtramp_end = i386obsd_sigtramp_end_addr;
|
||
tdep->sigtramp_p = i386obsd_sigtramp_p;
|
||
|
||
/* OpenBSD has a `struct sigcontext' that's different from the
|
||
original 4.3 BSD. */
|
||
tdep->sc_reg_offset = i386obsd_sc_reg_offset;
|
||
tdep->sc_num_regs = ARRAY_SIZE (i386obsd_sc_reg_offset);
|
||
|
||
/* OpenBSD provides a user-level threads implementation. */
|
||
bsd_uthread_set_supply_uthread (gdbarch, i386obsd_supply_uthread);
|
||
bsd_uthread_set_collect_uthread (gdbarch, i386obsd_collect_uthread);
|
||
|
||
/* Unwind kernel trap frames correctly. */
|
||
frame_unwind_prepend_unwinder (gdbarch, &i386obsd_trapframe_unwind);
|
||
|
||
/* OpenBSD ELF uses SVR4-style shared libraries. */
|
||
set_solib_svr4_fetch_link_map_offsets
|
||
(gdbarch, svr4_ilp32_fetch_link_map_offsets);
|
||
}
|
||
|
||
void _initialize_i386obsd_tdep ();
|
||
void
|
||
_initialize_i386obsd_tdep ()
|
||
{
|
||
gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_OPENBSD,
|
||
i386obsd_init_abi);
|
||
}
|