diff options
Diffstat (limited to 'gdb/i386bsd-tdep.c')
| -rw-r--r-- | gdb/i386bsd-tdep.c | 201 |
1 files changed, 182 insertions, 19 deletions
diff --git a/gdb/i386bsd-tdep.c b/gdb/i386bsd-tdep.c index a01ed6b..e6427b3 100644 --- a/gdb/i386bsd-tdep.c +++ b/gdb/i386bsd-tdep.c @@ -1,5 +1,5 @@ /* Target-dependent code for i386 BSD's. - Copyright 2001 Free Software Foundation, Inc. + Copyright 2001, 2002 Free Software Foundation, Inc. This file is part of GDB. @@ -23,26 +23,19 @@ #include "gdbcore.h" #include "regcache.h" -/* Support for signal handlers. */ - -/* Range in which to find the signaltramp routine, traditionally found - on the use stack, just below the user area. Initialized to values - that work for NetBSD and FreeBSD. */ +#include "i386-tdep.h" -CORE_ADDR i386bsd_sigtramp_start = 0xbfbfdf20; -CORE_ADDR i386bsd_sigtramp_end = 0xbfbfdff0; +/* Support for signal handlers. */ /* Return whether PC is in a BSD sigtramp routine. */ -int -i386bsd_in_sigtramp (CORE_ADDR pc, char *name) +static int +i386bsd_pc_in_sigtramp (CORE_ADDR pc, char *name) { - return (pc >= i386bsd_sigtramp_start && pc < i386bsd_sigtramp_end); -} + struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); -/* Offset in the sigcontext structure of the program counter. - Initialized to the value from 4.4 BSD Lite. */ -int i386bsd_sigcontext_pc_offset = 20; + return (pc >= tdep->sigtramp_start && pc < tdep->sigtramp_end); +} /* Assuming FRAME is for a BSD sigtramp routine, return the address of the associated sigcontext structure. */ @@ -62,19 +55,24 @@ i386bsd_sigcontext_addr (struct frame_info *frame) } /* Assuming FRAME is for a BSD sigtramp routine, return the saved - program counter. */ + program counter. -static CORE_ADDR + Note: This function is used for Solaris 2 too, so don't make it + static. */ + +CORE_ADDR i386bsd_sigtramp_saved_pc (struct frame_info *frame) { + int sc_pc_offset = gdbarch_tdep (current_gdbarch)->sc_pc_offset; CORE_ADDR addr; + addr = i386bsd_sigcontext_addr (frame); - return read_memory_unsigned_integer (addr + i386bsd_sigcontext_pc_offset, 4); + return read_memory_unsigned_integer (addr + sc_pc_offset, 4); } /* Return the saved program counter for FRAME. */ -CORE_ADDR +static CORE_ADDR i386bsd_frame_saved_pc (struct frame_info *frame) { if (frame->signal_handler_caller) @@ -82,3 +80,168 @@ i386bsd_frame_saved_pc (struct frame_info *frame) return read_memory_unsigned_integer (frame->frame + 4, 4); } + +/* Return the start address of the sigtramp routine. */ + +CORE_ADDR +i386bsd_sigtramp_start (CORE_ADDR pc) +{ + return gdbarch_tdep (current_gdbarch)->sigtramp_start; +} + +/* Return the end address of the sigtramp routine. */ + +CORE_ADDR +i386bsd_sigtramp_end (CORE_ADDR pc) +{ + return gdbarch_tdep (current_gdbarch)->sigtramp_end; +} + + +/* Traditional BSD (4.3 BSD, still used for BSDI and 386BSD). */ + +/* From <machine/signal.h>. */ +int i386bsd_sc_pc_offset = 20; + +static void +i386bsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) +{ + struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); + + set_gdbarch_pc_in_sigtramp (gdbarch, i386bsd_pc_in_sigtramp); + + tdep->jb_pc_offset = 0; + + tdep->sigtramp_saved_pc = i386bsd_sigtramp_saved_pc; + tdep->sigtramp_start = 0xfdbfdfc0; + tdep->sigtramp_end = 0xfdbfe000; + tdep->sc_pc_offset = i386bsd_sc_pc_offset; +} + +/* NetBSD 1.0 or later. */ + +/* From <machine/signal.h>. */ +int i386nbsd_sc_pc_offset = 44; + +static void +i386nbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) +{ + struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); + + /* Obviously NetBSD is BSD-based. */ + i386bsd_init_abi (info, gdbarch); + + /* NetBSD uses -freg-struct-return by default. */ + tdep->struct_return = reg_struct_return; + + /* NetBSD uses a different memory layout. */ + tdep->sigtramp_start = 0xbfbfdf20; + tdep->sigtramp_end = 0xbfbfdff0; + + /* NetBSD has a `struct sigcontext' that's different from the + origional 4.3 BSD. */ + tdep->sc_pc_offset = i386nbsd_sc_pc_offset; +} + +/* NetBSD ELF. */ +static void +i386nbsdelf_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) +{ + struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); + + /* It's still NetBSD. */ + i386nbsd_init_abi (info, gdbarch); + + /* But ELF-based. */ + i386_elf_init_abi (info, gdbarch); + + /* NetBSD ELF uses -fpcc-struct-return by default. */ + tdep->struct_return = pcc_struct_return; + + /* We support the SSE registers on NetBSD ELF. */ + tdep->num_xmm_regs = I386_NUM_XREGS - 1; + set_gdbarch_num_regs (gdbarch, I386_NUM_GREGS + I386_NUM_FREGS + + I386_NUM_XREGS); +} + +/* FreeBSD 3.0-RELEASE or later. */ + +CORE_ADDR i386fbsd_sigtramp_start = 0xbfbfdf20; +CORE_ADDR i386fbsd_sigtramp_end = 0xbfbfdff0; + +static void +i386fbsdaout_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) +{ + struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); + + /* Obviously FreeBSD is BSD-based. */ + i386bsd_init_abi (info, gdbarch); + + /* FreeBSD uses -freg-struct-return by default. */ + tdep->struct_return = reg_struct_return; + + /* FreeBSD uses a different memory layout. */ + tdep->sigtramp_start = i386fbsd_sigtramp_start; + tdep->sigtramp_end = i386fbsd_sigtramp_end; +} + +static void +i386fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) +{ + /* It's almost identical to FreeBSD a.out. */ + i386fbsdaout_init_abi (info, gdbarch); + + /* Except that it uses ELF. */ + i386_elf_init_abi (info, gdbarch); +} + +/* FreeBSD 4.0-RELEASE or later. */ + +/* From <machine/signal.h>. */ +int i386fbsd4_sc_pc_offset = 76; + +static void +i386fbsd4_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) +{ + struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); + + /* Inherit stuff from older releases. We assume that FreeBSD + 4.0-RELEASE always uses ELF. */ + i386fbsd_init_abi (info, gdbarch); + + /* FreeBSD 4.0 introduced a new `struct sigcontext'. */ + tdep->sc_pc_offset = i386fbsd4_sc_pc_offset; +} + + +static enum gdb_osabi +i386bsd_aout_osabi_sniffer (bfd *abfd) +{ + if (strcmp (bfd_get_target (abfd), "a.out-i386-netbsd") == 0) + return GDB_OSABI_NETBSD_AOUT; + + if (strcmp (bfd_get_target (abfd), "a.out-i386-freebsd") == 0) + return GDB_OSABI_FREEBSD_AOUT; + + return GDB_OSABI_UNKNOWN; +} + + +/* Provide a prototype to silence -Wmissing-prototypes. */ +void _initialize_i386bsd_tdep (void); + +void +_initialize_i386bsd_tdep (void) +{ + gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_aout_flavour, + i386bsd_aout_osabi_sniffer); + + gdbarch_register_osabi (bfd_arch_i386, GDB_OSABI_NETBSD_AOUT, + i386nbsd_init_abi); + gdbarch_register_osabi (bfd_arch_i386, GDB_OSABI_NETBSD_ELF, + i386nbsdelf_init_abi); + gdbarch_register_osabi (bfd_arch_i386, GDB_OSABI_FREEBSD_AOUT, + i386fbsdaout_init_abi); + gdbarch_register_osabi (bfd_arch_i386, GDB_OSABI_FREEBSD_ELF, + i386fbsd4_init_abi); +} |