RFC/H gdb6 port for powerpc
Andreas Tobler
andreast-list at fgznet.ch
Tue Sep 29 21:01:01 UTC 2009
Hi all,
I sent this mail out to Marcel but I did not get any feedback. Might be
due to mailer issues, I do not know.
I learned today, that I do not receive all mails directed to me. So I
try to spread some request for comment/help here.
I recently tried to get thunderbird working on powerpc. I was blocked
and I needed a debugger. The current gdb in base terminates immediatley
if I try to debug such a beast as thunderbird.
So I went ahead and tried to bring gdb6 (from ports, 6.6.1) into a
working state.
I think I succeeded somehow, but I need some more help.
Attached you'll find two files which you can put into the ports files
directory of gdb6. (files)
My issues I have are seen when you run 'gmake check' inside the gdb
build directory.
There are a lot of signal stuff which does not work. Also unwinding
seems not in good shape.
My request here on this list is, can anybody help guiding me on the
missing bits?
I'd appreciate any comments here, from gth to 'you could do this better'
or anything else, but please respond.
TIA,
Andreas
P.S, here the summary of gmake check:
=== gdb Summary ===
# of expected passes 10484
# of unexpected failures 196
# of expected failures 41
# of known failures 62
# of unresolved testcases 1
# of untested testcases 13
# of unsupported tests 14
-------------- next part --------------
--- ./gdb/ppcfbsd-nat.c.orig 2009-09-14 10:22:36.000000000 +0200
+++ ./gdb/ppcfbsd-nat.c 2009-09-14 10:22:36.000000000 +0200
@@ -0,0 +1,159 @@
+/* Native-dependent code for PowerPC's running FreeBSD, for GDB.
+ Copyright 2002, 2004 Free Software Foundation, Inc.
+ Contributed by Wasabi Systems, 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 <sys/types.h>
+#include <sys/ptrace.h>
+#include <machine/reg.h>
+#include <machine/frame.h>
+
+#include "defs.h"
+#include "inferior.h"
+#include "inf-ptrace.h"
+#include "gdb_assert.h"
+#include "gdbcore.h"
+#include "regcache.h"
+
+#include "ppc-tdep.h"
+#include "ppcfbsd-tdep.h"
+
+
+static int
+getfpregs_supplies (int regno)
+{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
+
+ /* FIXME: jimb/2004-05-05: Some PPC variants don't have floating
+ point registers. Traditionally, GDB's register set has still
+ listed the floating point registers for such machines, so this
+ code is harmless. However, the new E500 port actually omits the
+ floating point registers entirely from the register set --- they
+ don't even have register numbers assigned to them.
+
+ It's not clear to me how best to update this code, so this assert
+ will alert the first person to encounter the NetBSD/E500
+ combination to the problem. */
+ gdb_assert (ppc_floating_point_unit_p (current_gdbarch));
+
+ return ((regno >= tdep->ppc_fp0_regnum
+ && regno < tdep->ppc_fp0_regnum + ppc_num_fprs)
+ || regno == tdep->ppc_fpscr_regnum);
+}
+
+static void
+ppcfbsd_fetch_inferior_registers (int regno)
+{
+ struct reg regs;
+
+ if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
+ (PTRACE_TYPE_ARG3) ®s, 0) == -1)
+ perror_with_name (_("Couldn't get registers"));
+
+ ppc_supply_gregset (&ppcfbsd_gregset, current_regcache, regno,
+ ®s, sizeof regs);
+
+ if (regno == -1 || getfpregs_supplies (regno))
+ {
+ struct fpreg fpregs;
+
+ if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
+ (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
+ perror_with_name (_("Couldn't get FP registers"));
+
+ ppc_supply_fpregset (&ppcfbsd_fpregset, current_regcache, regno,
+ &fpregs, sizeof fpregs);
+ }
+}
+
+static void
+ppcfbsd_store_inferior_registers (int regno)
+{
+ struct reg regs;
+
+ if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
+ (PTRACE_TYPE_ARG3) ®s, 0) == -1)
+ perror_with_name (_("Couldn't get registers"));
+
+ ppc_collect_gregset (&ppcfbsd_gregset, current_regcache,
+ regno, ®s, sizeof regs);
+
+ if (ptrace (PT_SETREGS, PIDGET (inferior_ptid),
+ (PTRACE_TYPE_ARG3) ®s, 0) == -1)
+ perror_with_name (_("Couldn't write registers"));
+
+
+ if (regno == -1 || getfpregs_supplies (regno))
+ {
+ struct fpreg fpregs;
+
+ if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
+ (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
+ perror_with_name (_("Couldn't get FP registers"));
+
+ ppc_collect_fpregset (&ppcfbsd_fpregset, current_regcache,
+ regno, &fpregs, sizeof fpregs);
+
+ if (ptrace (PT_SETFPREGS, PIDGET (inferior_ptid),
+ (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
+ perror_with_name (_("Couldn't set FP registers"));
+ }
+}
+
+/* Provide a prototype to silence -Wmissing-prototypes. */
+void _initialize_ppcfbsd_nat (void);
+
+void
+_initialize_ppcfbsd_nat (void)
+{
+ struct target_ops *t;
+ /* Support debugging kernel virtual memory images. */
+ /* bsd_kvm_add_target (ppcnbsd_supply_pcb); */
+
+ /* Add in local overrides. */
+ t = inf_ptrace_target ();
+ t->to_fetch_registers = ppcfbsd_fetch_inferior_registers;
+ t->to_store_registers = ppcfbsd_store_inferior_registers;
+ add_target (t);
+
+ /* General-purpose registers. */
+ ppcfbsd_reg_offsets.r0_offset = offsetof (struct reg, fixreg);
+ ppcfbsd_reg_offsets.lr_offset = offsetof (struct reg, lr);
+ ppcfbsd_reg_offsets.cr_offset = offsetof (struct reg, cr);
+ /* ppcfbsd_reg_offsets.ps_offset = offsetof (struct reg, ps); */
+ ppcfbsd_reg_offsets.xer_offset = offsetof (struct reg, xer);
+ ppcfbsd_reg_offsets.ctr_offset = offsetof (struct reg, ctr);
+ ppcfbsd_reg_offsets.pc_offset = offsetof (struct reg, pc);
+
+ /* ppcfbsd_reg_offsets.mq_offset = offsetof (struct reg, mq); */
+
+ /* Floating-point registers. */
+ /* ppcfbsd_reg_offsets.f0_offset = offsetof (struct reg, fpreg); */
+ /* ppcfbsd_reg_offsets.fpscr_offset = -1; */
+
+#ifdef PT_GETFPREGS
+ ppcfbsd_fpreg_offsets.f0_offset = offsetof (struct fpreg, fpreg);
+ ppcfbsd_fpreg_offsets.fpscr_offset = offsetof (struct fpreg, fpscr);
+#endif
+
+ /* AltiVec registers. */
+ /* ppcfbsd_reg_offsets.vr0_offset = offsetof (struct vreg, vreg); */
+ /* ppcfbsd_reg_offsets.vscr_offset = offsetof (struct vreg, vscr); */
+ /* ppcfbsd_reg_offsets.vrsave_offset = offsetof (struct vreg, vrsave); */
+}
--- ./gdb/ppcfbsd-tdep.h.orig 2009-09-14 10:22:36.000000000 +0200
+++ ./gdb/ppcfbsd-tdep.h 2009-09-14 10:22:36.000000000 +0200
@@ -0,0 +1,37 @@
+/* Common target dependent code for GDB on PowerPC systems running FreeBSD.
+ 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. */
+
+#ifndef PPCFBSD_TDEP_H
+#define PPCFBSD_TDEP_H
+
+#include <stddef.h>
+
+struct regset;
+struct regcache;
+
+/* Register offsets for FreeBSD/powerpc. */
+extern struct ppc_reg_offsets ppcfbsd_reg_offsets;
+extern struct ppc_reg_offsets ppcfbsd_fpreg_offsets;
+
+/* Register sets for FreeBSD/powerpc. */
+extern struct regset ppcfbsd_gregset;
+extern struct regset ppcfbsd_fpregset;
+
+#endif /* PPCFBSD_TDEP_H */
--- ./gdb/ppcfbsd-tdep.c.orig 2009-09-14 10:22:36.000000000 +0200
+++ ./gdb/ppcfbsd-tdep.c 2009-09-14 10:22:36.000000000 +0200
@@ -0,0 +1,233 @@
+/* Target-dependent code for PowerPC systems running FreeBSD.
+
+ Copyright 2002, 2003, 2004 Free Software Foundation, Inc.
+
+ Contributed by Wasabi Systems, 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 "floatformat.h"
+#include "frame.h"
+#include "trad-frame.h"
+#include "osabi.h"
+#include "regcache.h"
+#include "regset.h"
+#include "symtab.h"
+#include "frame-unwind.h"
+#include "tramp-frame.h"
+
+#include "gdb_assert.h"
+#include "gdb_string.h"
+
+#include "ppc-tdep.h"
+#include "ppcfbsd-tdep.h"
+#include "solib-svr4.h"
+
+/* Register offsets from <machine/reg.h>. */
+struct ppc_reg_offsets ppcfbsd_reg_offsets;
+struct ppc_reg_offsets ppcfbsd_fpreg_offsets;
+
+/* FreeBSD/powerpc register set. */
+
+struct regset ppcfbsd_gregset =
+{
+ &ppcfbsd_reg_offsets,
+ ppc_supply_gregset
+};
+
+struct regset ppcfbsd_fpregset =
+{
+ &ppcfbsd_fpreg_offsets,
+ ppc_supply_fpregset
+};
+
+/* Return the appropriate register set for the core section identified
+ by SECT_NAME and SECT_SIZE. */
+
+static const struct regset *
+ppcfbsd_regset_from_core_section (struct gdbarch *gdbarch,
+ const char *sect_name, size_t sect_size)
+{
+ if (strcmp (sect_name, ".reg") == 0 && sect_size >= 148)
+ return &ppcfbsd_gregset;
+
+ if (strcmp (sect_name, ".reg2") == 0 && sect_size >= 264)
+ return &ppcfbsd_fpregset;
+
+ return NULL;
+}
+
+/* Default page size. */
+static const int ppcfbsd_page_size = 2048;
+
+/* Offset for sigreturn(2). */
+static const int ppcfbsd_sigreturn_offset[] = {
+ 0x0c, /* FreeBSD */
+ -1
+};
+
+static int
+ppcfbsd_sigtramp_p (struct frame_info *next_frame)
+{
+ CORE_ADDR pc = frame_pc_unwind (next_frame);
+ CORE_ADDR start_pc = (pc & ~(ppcfbsd_page_size - 1));
+ const int *offset;
+ char *name;
+
+ find_pc_partial_function (pc, &name, NULL, NULL);
+ if (name)
+ return 0;
+
+ for (offset = ppcfbsd_sigreturn_offset; *offset != -1; offset++)
+ {
+ gdb_byte buf[2 * PPC_INSN_SIZE];
+ unsigned long insn;
+
+ if (!safe_frame_unwind_memory (next_frame, start_pc + *offset,
+ buf, sizeof buf))
+ continue;
+
+ /* Check for "li r0,SYS_sigreturn". */
+ insn = extract_unsigned_integer (buf, PPC_INSN_SIZE);
+ if (insn != 0x380001a1)
+ continue;
+
+ /* Check for "sc". */
+ insn = extract_unsigned_integer (buf + PPC_INSN_SIZE, PPC_INSN_SIZE);
+ if (insn != 0x44000002)
+ continue;
+
+ return 1;
+ }
+
+ return 0;
+}
+
+/* Signal trampolines. */
+
+static void
+ppcfbsd_sigtramp_cache_init (const struct tramp_frame *self,
+ struct frame_info *next_frame,
+ struct trad_frame_cache *this_cache,
+ CORE_ADDR func)
+{
+ struct gdbarch *gdbarch = get_frame_arch (next_frame);
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+ CORE_ADDR addr, base;
+ int i;
+
+ base = frame_unwind_register_unsigned (next_frame, SP_REGNUM);
+ addr = base + 0x10 + 2 * tdep->wordsize;
+ for (i = 0; i < ppc_num_gprs; i++, addr += tdep->wordsize)
+ {
+ int regnum = i + tdep->ppc_gp0_regnum;
+ trad_frame_set_reg_addr (this_cache, regnum, addr);
+ }
+ trad_frame_set_reg_addr (this_cache, tdep->ppc_lr_regnum, addr);
+ addr += tdep->wordsize;
+ trad_frame_set_reg_addr (this_cache, tdep->ppc_cr_regnum, addr);
+ addr += tdep->wordsize;
+ trad_frame_set_reg_addr (this_cache, tdep->ppc_xer_regnum, addr);
+ addr += tdep->wordsize;
+ trad_frame_set_reg_addr (this_cache, tdep->ppc_ctr_regnum, addr);
+ addr += tdep->wordsize;
+ trad_frame_set_reg_addr (this_cache, PC_REGNUM, addr); /* SRR0? */
+ addr += tdep->wordsize;
+
+ /* Construct the frame ID using the function start. */
+ trad_frame_set_id (this_cache, frame_id_build (base, func));
+}
+
+static const struct tramp_frame ppcfbsd_sigtramp =
+{
+ SIGTRAMP_FRAME,
+ 4,
+ {
+ { 0x3821fff0, -1 }, /* add r1,r1,-16 */
+ { 0x4e800021, -1 }, /* blrl */
+ { 0x38610018, -1 }, /* addi r3,r1,24 */
+ { 0x380001a1, -1 }, /* li r0,417 */
+ { 0x44000002, -1 }, /* sc */
+ { 0x38000001, -1 }, /* li r0,1 */
+ { 0x44000002, -1 }, /* sc */
+ { TRAMP_SENTINEL_INSN, -1 }
+ },
+ ppcfbsd_sigtramp_cache_init
+};
+
+static void
+ppcfbsd_init_abi (struct gdbarch_info info,
+ struct gdbarch *gdbarch)
+{
+
+ /* FreeBSD doesn't support the 128-bit `long double' from the psABI. */
+ set_gdbarch_long_double_bit (gdbarch, 64);
+ set_gdbarch_long_double_format (gdbarch, &floatformat_ieee_double_big);
+
+ /* FreeBSD currently uses a broken GCC. */
+ set_gdbarch_return_value (gdbarch, ppc_sysv_abi_broken_return_value);
+
+ set_solib_svr4_fetch_link_map_offsets (gdbarch,
+ svr4_ilp32_fetch_link_map_offsets);
+ set_gdbarch_regset_from_core_section
+ (gdbarch, ppcfbsd_regset_from_core_section);
+
+ tramp_frame_prepend_unwinder (gdbarch, &ppcfbsd_sigtramp);
+
+
+}
+
+/* Provide a prototype to silence -Wmissing-prototypes. */
+void _initialize_ppcfbsd_tdep (void);
+
+void
+_initialize_ppcfbsd_tdep (void)
+{
+ gdbarch_register_osabi (bfd_arch_rs6000, 0, GDB_OSABI_FREEBSD_ELF,
+ ppcfbsd_init_abi);
+ gdbarch_register_osabi (bfd_arch_powerpc, 0, GDB_OSABI_FREEBSD_ELF,
+ ppcfbsd_init_abi);
+
+ /* Avoid initializing the register offsets again if they were
+ already initailized by ppcnbsd-nat.c. */
+ if (ppcfbsd_reg_offsets.pc_offset == 0)
+ {
+ /* General-purpose registers. */
+ ppcfbsd_reg_offsets.r0_offset = 0;
+ ppcfbsd_reg_offsets.lr_offset = 128;
+ ppcfbsd_reg_offsets.cr_offset = 132;
+ ppcfbsd_reg_offsets.xer_offset = 136;
+ ppcfbsd_reg_offsets.ctr_offset = 140;
+ ppcfbsd_reg_offsets.pc_offset = 144;
+ ppcfbsd_reg_offsets.ps_offset = -1;
+ ppcfbsd_reg_offsets.mq_offset = -1;
+
+ if (ppcfbsd_fpreg_offsets.fpscr_offset == 0)
+ {
+ /* Floating-point registers. */
+ ppcfbsd_reg_offsets.f0_offset = 0;
+ ppcfbsd_reg_offsets.fpscr_offset = 256;
+ }
+ /* AltiVec registers. */
+ ppcfbsd_reg_offsets.vr0_offset = -1;
+ ppcfbsd_reg_offsets.vrsave_offset = -1;
+ ppcfbsd_reg_offsets.vscr_offset = -1;
+ }
+}
--- ./gdb/config/powerpc/nm-fbsd.h.orig 2009-09-14 10:24:03.000000000 +0200
+++ ./gdb/config/powerpc/nm-fbsd.h 2009-09-14 10:24:03.000000000 +0200
@@ -0,0 +1,20 @@
+/* GNU GPL */
+
+#ifndef NM_FBSD_H
+#define NM_FBSD_H
+
+/* Type of the third argument to the `ptrace' system call. */
+/* #define PTRACE_ARG3_TYPE caddr_t */
+
+/* Override copies of {fetch,store}_inferior_registers in `infptrace.c'. */
+/* #define FETCH_INFERIOR_REGISTERS */
+
+/* We can attach and detach. */
+/* #define ATTACH_DETACH */
+
+/* Override child_pid_to_exec_file in 'inftarg.c'. */
+/*#define CHILD_PID_TO_EXEC_FILE */
+
+#define TEXT_SEGMENT_BASE 0x10000000
+
+#endif /* NM_FBSD_H */
--- ./gdb/config/powerpc/fbsd.mh.orig 2009-09-14 10:23:26.000000000 +0200
+++ ./gdb/config/powerpc/fbsd.mh 2009-09-14 10:23:26.000000000 +0200
@@ -0,0 +1,6 @@
+# Host: FreeBSD/powerpc
+NATDEPFILES= fork-child.o gcore.o \
+ inf-ptrace.o ppcfbsd-nat.o bsd-kvm.o
+
+NAT_FILE = nm-fbsd.h
+LOADLIBES= -lkvm
--- ./gdb/config/powerpc/fbsd.mt.orig 2009-09-14 10:23:25.000000000 +0200
+++ ./gdb/config/powerpc/fbsd.mt 2009-09-14 10:23:26.000000000 +0200
@@ -0,0 +1,5 @@
+# Target: FreeBSD/powerpc
+TDEPFILES= rs6000-tdep.o ppc-sysv-tdep.o ppcfbsd-tdep.o \
+ corelow.o solib.o solib-svr4.o
+
+TM_FILE= tm-ppc-eabi.h
\ No newline at end of file
-------------- next part --------------
--- ./gdb/configure.host.orig 2006-11-24 20:54:15.000000000 +0100
+++ ./gdb/configure.host 2009-09-14 10:13:50.000000000 +0200
@@ -109,6 +109,7 @@
mips64*-*-openbsd*) gdb_host=obsd64 ;;
powerpc-*-aix*) gdb_host=aix ;;
+powerpc-*-freebsd*) gdb_host=fbsd ;;
powerpc-*-linux*) gdb_host=linux ;;
powerpc-*-netbsd* | powerpc-*-knetbsd*-gnu)
gdb_host=nbsd ;;
--- ./gdb/configure.tgt.orig 2006-11-24 21:11:07.000000000 +0100
+++ ./gdb/configure.tgt 2009-09-14 10:13:27.000000000 +0200
@@ -155,6 +155,7 @@
mt-*-*) gdb_target=mt ;;
+powerpc-*-freebsd*) gdb_target=fbsd ;;
powerpc-*-netbsd* | powerpc-*-knetbsd*-gnu)
gdb_target=nbsd ;;
powerpc-*-openbsd*) gdb_target=obsd ;;
--- gdb/Makefile.in.orig 2009-09-14 19:56:00.000000000 +0200
+++ gdb/Makefile.in 2009-09-14 19:56:09.000000000 +0200
@@ -766,6 +766,7 @@
osabi_h = osabi.h
parser_defs_h = parser-defs.h $(doublest_h)
p_lang_h = p-lang.h
+ppcfbsd_tdep_h = ppcfbsd-tdep.h
ppcnbsd_tdep_h = ppcnbsd-tdep.h
ppcobsd_tdep_h = ppcobsd-tdep.h
ppc_tdep_h = ppc-tdep.h
@@ -1478,6 +1479,7 @@
somread.c solib-som.c $(HPREAD_SOURCE) \
posix-hdep.c \
ppc-sysv-tdep.c ppc-linux-nat.c ppc-linux-tdep.c \
+ ppcfbsd-nat.c ppcfbsd-tdep.c \
ppcnbsd-nat.c ppcnbsd-tdep.c \
ppcobsd-nat.c ppcobsd-tdep.c \
procfs.c \
@@ -2456,6 +2458,13 @@
$(objfiles_h) $(regcache_h) $(value_h) $(osabi_h) $(regset_h) \
$(solib_svr4_h) $(ppc_tdep_h) $(trad_frame_h) $(frame_unwind_h) \
$(tramp_frame_h)
+ppcfbsd-nat.o: ppcfbsd-nat.c $(defs_h) $(inferior_h) $(gdb_assert_h) \
+ $(gdbcore_h) $(regcache_h) $(bsd_kvm_h) $(ppc_tdep_h) \
+ $(ppcfbsd_tdep_h) $(inf_ptrace_h)
+ppcfbsd-tdep.o: ppcfbsd-tdep.c $(defs_h) $(gdbcore_h) $(gdb_types_h) \
+ $(osabi_h) $(regcache_h) $(regset_h) $(trad_frame_h) \
+ $(tramp_frame_h) $(gdb_assert_h) $(gdb_string_h) \
+ $(ppc_tdep_h) $(ppcfbsd_tdep_h) $(solib_svr4_h)
ppcnbsd-nat.o: ppcnbsd-nat.c $(defs_h) $(inferior_h) $(gdb_assert_h) \
$(gdbcore_h) $(regcache_h) $(bsd_kvm_h) $(ppc_tdep_h) \
$(ppcnbsd_tdep_h) $(inf_ptrace_h)
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