/* Target-dependent code for OpenBSD/arm.
- Copyright (C) 2006 Free Software Foundation, Inc.
+ Copyright (C) 2006, 2007 Free Software Foundation, Inc.
This file is part of GDB.
#include "defs.h"
#include "osabi.h"
+#include "trad-frame.h"
+#include "tramp-frame.h"
+#include "gdb_string.h"
+
+#include "obsd-tdep.h"
#include "arm-tdep.h"
#include "solib-svr4.h"
+/* Signal trampolines. */
+
+static void
+armobsd_sigframe_init (const struct tramp_frame *self,
+ struct frame_info *next_frame,
+ struct trad_frame_cache *cache,
+ CORE_ADDR func)
+{
+ CORE_ADDR sp, sigcontext_addr, addr;
+ int regnum;
+
+ /* We find the appropriate instance of `struct sigcontext' at a
+ fixed offset in the signal frame. */
+ sp = frame_unwind_register_signed (next_frame, ARM_SP_REGNUM);
+ sigcontext_addr = sp + 16;
+
+ /* PC. */
+ trad_frame_set_reg_addr (cache, ARM_PC_REGNUM, sigcontext_addr + 76);
+
+ /* GPRs. */
+ for (regnum = ARM_A1_REGNUM, addr = sigcontext_addr + 12;
+ regnum <= ARM_LR_REGNUM; regnum++, addr += 4)
+ trad_frame_set_reg_addr (cache, regnum, addr);
+
+ trad_frame_set_id (cache, frame_id_build (sp, func));
+}
+
+static const struct tramp_frame armobsd_sigframe =
+{
+ SIGTRAMP_FRAME,
+ 4,
+ {
+ { 0xe28d0010, -1 }, /* add r0, sp, #16 */
+ { 0xef000067, -1 }, /* swi SYS_sigreturn */
+ { 0xef000001, -1 }, /* swi SYS_exit */
+ { 0xeafffffc, -1 }, /* b . - 8 */
+ { TRAMP_SENTINEL_INSN, -1 }
+ },
+ armobsd_sigframe_init
+};
+\f
+
+/* Override default thumb breakpoints. */
+static const char arm_obsd_thumb_le_breakpoint[] = {0xfe, 0xdf};
+static const char arm_obsd_thumb_be_breakpoint[] = {0xdf, 0xfe};
+
static void
armobsd_init_abi (struct gdbarch_info info,
struct gdbarch *gdbarch)
if (tdep->fp_model == ARM_FLOAT_AUTO)
tdep->fp_model = ARM_FLOAT_SOFT_VFP;
+ tramp_frame_prepend_unwinder (gdbarch, &armobsd_sigframe);
+
/* OpenBSD/arm uses SVR4-style shared libraries. */
set_solib_svr4_fetch_link_map_offsets
(gdbarch, svr4_ilp32_fetch_link_map_offsets);
+ set_gdbarch_skip_solib_resolver (gdbarch, obsd_skip_solib_resolver);
tdep->jb_pc = 24;
tdep->jb_elt_size = 4;
+
+ set_gdbarch_regset_from_core_section
+ (gdbarch, armbsd_regset_from_core_section);
+
+ /* OpenBSD/arm uses -fpcc-struct-return by default. */
+ tdep->struct_return = pcc_struct_return;
+
+ /* Single stepping. */
+ set_gdbarch_software_single_step (gdbarch, arm_software_single_step);
+
+ /* Breakpoints. */
+ switch (info.byte_order)
+ {
+ case BFD_ENDIAN_BIG:
+ tdep->thumb_breakpoint = arm_obsd_thumb_be_breakpoint;
+ tdep->thumb_breakpoint_size = sizeof (arm_obsd_thumb_be_breakpoint);
+ break;
+
+ case BFD_ENDIAN_LITTLE:
+ tdep->thumb_breakpoint = arm_obsd_thumb_le_breakpoint;
+ tdep->thumb_breakpoint_size = sizeof (arm_obsd_thumb_le_breakpoint);
+ break;
+ }
+}
+\f
+
+static enum gdb_osabi
+armobsd_core_osabi_sniffer (bfd *abfd)
+{
+ if (strcmp (bfd_get_target (abfd), "netbsd-core") == 0)
+ return GDB_OSABI_OPENBSD_ELF;
+
+ return GDB_OSABI_UNKNOWN;
}
void
_initialize_armobsd_tdep (void)
{
+ /* BFD doesn't set a flavour for NetBSD style a.out core files. */
+ gdbarch_register_osabi_sniffer (bfd_arch_arm, bfd_target_unknown_flavour,
+ armobsd_core_osabi_sniffer);
+
gdbarch_register_osabi (bfd_arch_arm, 0, GDB_OSABI_OPENBSD_ELF,
armobsd_init_abi);
}