/* Target-dependent code for NetBSD/sparc.
- Copyright 2002, 2003, 2004 Free Software Foundation, Inc.
+ Copyright (C) 2002, 2003, 2004, 2006, 2007 Free Software Foundation, Inc.
Contributed by Wasabi Systems, Inc.
This file is part of GDB.
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. */
+ Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ Boston, MA 02110-1301, USA. */
#include "defs.h"
-#include "floatformat.h"
#include "frame.h"
#include "frame-unwind.h"
#include "gdbcore.h"
+#include "gdbtypes.h"
#include "osabi.h"
#include "regcache.h"
+#include "regset.h"
#include "solib-svr4.h"
#include "symtab.h"
#include "trad-frame.h"
#include "sparc-tdep.h"
#include "nbsd-tdep.h"
+/* Macros to extract fields from SPARC instructions. */
+#define X_RS1(i) (((i) >> 14) & 0x1f)
+#define X_RS2(i) ((i) & 0x1f)
+#define X_I(i) (((i) >> 13) & 1)
+
const struct sparc_gregset sparc32nbsd_gregset =
{
0 * 4, /* %psr */
-1 /* %l0 */
};
-/* Unlike other NetBSD implementations, the SPARC port historically
- used .reg and .reg2 (see bfd/netbsd-core.c), and as such, we can
- share one routine for a.out and ELF core files. */
-
static void
-fetch_core_registers (char *core_reg_sect, unsigned core_reg_size, int which,
- CORE_ADDR ignore)
+sparc32nbsd_supply_gregset (const struct regset *regset,
+ struct regcache *regcache,
+ int regnum, const void *gregs, size_t len)
{
- int reg_size = 20 * 4;
- int fpreg_size = 33 * 4;
+ sparc32_supply_gregset (&sparc32nbsd_gregset, regcache, regnum, gregs);
- switch (which)
- {
- case 0: /* Integer registers. */
- if (core_reg_size != reg_size)
- warning ("Wrong size register set in core file.");
- sparc32_supply_gregset (&sparc32nbsd_gregset, current_regcache,
- -1, core_reg_sect);
- break;
-
- case 2: /* Floating pointer registers. */
- if (core_reg_size != fpreg_size)
- warning ("Wrong size FP register set in core file.");
- sparc32_supply_fpregset (current_regcache, -1, core_reg_sect);
- break;
-
- default:
- /* Don't know what kind of register request this is; just ignore it. */
- break;
- }
+ /* Traditional NetBSD core files don't use multiple register sets.
+ Instead, the general-purpose and floating-point registers are
+ lumped together in a single section. */
+ if (len >= 212)
+ sparc32_supply_fpregset (regcache, regnum, (const char *) gregs + 80);
}
-static struct core_fns sparcnbsd_core_fns =
+static void
+sparc32nbsd_supply_fpregset (const struct regset *regset,
+ struct regcache *regcache,
+ int regnum, const void *fpregs, size_t len)
{
- bfd_target_unknown_flavour, /* core_flavour */
- default_check_format, /* check_format */
- default_core_sniffer, /* core_sniffer */
- fetch_core_registers, /* core_read_registers */
- NULL
-};
+ sparc32_supply_fpregset (regcache, regnum, fpregs);
+}
-static struct core_fns sparcnbsd_elfcore_fns =
-{
- bfd_target_elf_flavour, /* core_flavour */
- default_check_format, /* check_format */
- default_core_sniffer, /* core_sniffer */
- fetch_core_registers, /* core_read_registers */
- NULL
-};
\f
/* Signal trampolines. */
return nbsd_pc_in_sigtramp (pc, name);
}
-static struct sparc_frame_cache *
-sparc32nbsd_sigcontext_frame_cache (struct frame_info *next_frame,
- void **this_cache)
+struct trad_frame_saved_reg *
+sparc32nbsd_sigcontext_saved_regs (struct frame_info *next_frame)
{
- struct sparc_frame_cache *cache;
+ struct trad_frame_saved_reg *saved_regs;
CORE_ADDR addr, sigcontext_addr;
- LONGEST psr;
int regnum, delta;
+ ULONGEST psr;
- if (*this_cache)
- return *this_cache;
+ saved_regs = trad_frame_alloc_saved_regs (next_frame);
- cache = sparc_frame_cache (next_frame, this_cache);
- gdb_assert (cache == *this_cache);
+ /* We find the appropriate instance of `struct sigcontext' at a
+ fixed offset in the signal frame. */
+ addr = frame_unwind_register_unsigned (next_frame, SPARC_FP_REGNUM);
+ sigcontext_addr = addr + 64 + 16;
/* The registers are saved in bits and pieces scattered all over the
place. The code below records their location on the assumption
that the part of the signal trampoline that saves the state has
been executed. */
- /* If we couldn't find the frame's function, we're probably dealing
- with an on-stack signal trampoline. */
- if (cache->pc == 0)
- {
- cache->pc = sparc32nbsd_sigtramp_start;
-
- /* Since we couldn't find the frame's function, the cache was
- initialized under the assumption that we're frameless. */
- cache->frameless_p = 0;
- addr = frame_unwind_register_unsigned (next_frame, SPARC_FP_REGNUM);
- cache->base = addr;
- }
-
- cache->saved_regs = trad_frame_alloc_saved_regs (next_frame);
-
- /* We find the appropriate instance of `struct sigcontext' at a
- fixed offset in the signal frame. */
- sigcontext_addr = cache->base + 64 + 16;
-
- cache->saved_regs[SPARC_SP_REGNUM].addr = sigcontext_addr + 8;
- cache->saved_regs[SPARC32_PC_REGNUM].addr = sigcontext_addr + 12;
- cache->saved_regs[SPARC32_NPC_REGNUM].addr = sigcontext_addr + 16;
- cache->saved_regs[SPARC32_PSR_REGNUM].addr = sigcontext_addr + 20;
- cache->saved_regs[SPARC_G1_REGNUM].addr = sigcontext_addr + 24;
- cache->saved_regs[SPARC_O0_REGNUM].addr = sigcontext_addr + 28;
+ saved_regs[SPARC_SP_REGNUM].addr = sigcontext_addr + 8;
+ saved_regs[SPARC32_PC_REGNUM].addr = sigcontext_addr + 12;
+ saved_regs[SPARC32_NPC_REGNUM].addr = sigcontext_addr + 16;
+ saved_regs[SPARC32_PSR_REGNUM].addr = sigcontext_addr + 20;
+ saved_regs[SPARC_G1_REGNUM].addr = sigcontext_addr + 24;
+ saved_regs[SPARC_O0_REGNUM].addr = sigcontext_addr + 28;
/* The remaining `global' registers and %y are saved in the `local'
registers. */
delta = SPARC_L0_REGNUM - SPARC_G0_REGNUM;
for (regnum = SPARC_G2_REGNUM; regnum <= SPARC_G7_REGNUM; regnum++)
- cache->saved_regs[regnum].realreg = regnum + delta;
- cache->saved_regs[SPARC32_Y_REGNUM].realreg = SPARC_L1_REGNUM;
+ saved_regs[regnum].realreg = regnum + delta;
+ saved_regs[SPARC32_Y_REGNUM].realreg = SPARC_L1_REGNUM;
/* The remaining `out' registers can be found in the current frame's
`in' registers. */
delta = SPARC_I0_REGNUM - SPARC_O0_REGNUM;
for (regnum = SPARC_O1_REGNUM; regnum <= SPARC_O5_REGNUM; regnum++)
- cache->saved_regs[regnum].realreg = regnum + delta;
- cache->saved_regs[SPARC_O7_REGNUM].realreg = SPARC_I7_REGNUM;
+ saved_regs[regnum].realreg = regnum + delta;
+ saved_regs[SPARC_O7_REGNUM].realreg = SPARC_I7_REGNUM;
/* The `local' and `in' registers have been saved in the register
save area. */
- addr = cache->saved_regs[SPARC_SP_REGNUM].addr;
+ addr = saved_regs[SPARC_SP_REGNUM].addr;
addr = get_frame_memory_unsigned (next_frame, addr, 4);
for (regnum = SPARC_L0_REGNUM;
regnum <= SPARC_I7_REGNUM; regnum++, addr += 4)
- cache->saved_regs[regnum].addr = addr;
+ saved_regs[regnum].addr = addr;
+
+ /* Handle StackGhost. */
+ {
+ ULONGEST wcookie = sparc_fetch_wcookie ();
+
+ if (wcookie != 0)
+ {
+ ULONGEST i7;
+
+ addr = saved_regs[SPARC_I7_REGNUM].addr;
+ i7 = get_frame_memory_unsigned (next_frame, addr, 4);
+ trad_frame_set_value (saved_regs, SPARC_I7_REGNUM, i7 ^ wcookie);
+ }
+ }
/* The floating-point registers are only saved if the EF bit in %prs
has been set. */
#define PSR_EF 0x00001000
- addr = cache->saved_regs[SPARC32_PSR_REGNUM].addr;
+ addr = saved_regs[SPARC32_PSR_REGNUM].addr;
psr = get_frame_memory_unsigned (next_frame, addr, 4);
if (psr & PSR_EF)
{
CORE_ADDR sp;
sp = frame_unwind_register_unsigned (next_frame, SPARC_SP_REGNUM);
- cache->saved_regs[SPARC32_FSR_REGNUM].addr = sp + 96;
+ saved_regs[SPARC32_FSR_REGNUM].addr = sp + 96;
for (regnum = SPARC_F0_REGNUM, addr = sp + 96 + 8;
regnum <= SPARC_F31_REGNUM; regnum++, addr += 4)
- cache->saved_regs[regnum].addr = addr;
+ saved_regs[regnum].addr = addr;
+ }
+
+ return saved_regs;
+}
+
+static struct sparc_frame_cache *
+sparc32nbsd_sigcontext_frame_cache (struct frame_info *next_frame,
+ void **this_cache)
+{
+ struct sparc_frame_cache *cache;
+ CORE_ADDR addr;
+
+ if (*this_cache)
+ return *this_cache;
+
+ cache = sparc_frame_cache (next_frame, this_cache);
+ gdb_assert (cache == *this_cache);
+
+ /* If we couldn't find the frame's function, we're probably dealing
+ with an on-stack signal trampoline. */
+ if (cache->pc == 0)
+ {
+ cache->pc = sparc32nbsd_sigtramp_start;
+
+ /* Since we couldn't find the frame's function, the cache was
+ initialized under the assumption that we're frameless. */
+ cache->frameless_p = 0;
+ addr = frame_unwind_register_unsigned (next_frame, SPARC_FP_REGNUM);
+ cache->base = addr;
}
+ cache->saved_regs = sparc32nbsd_sigcontext_saved_regs (next_frame);
+
return cache;
}
int regnum, int *optimizedp,
enum lval_type *lvalp,
CORE_ADDR *addrp,
- int *realnump, void *valuep)
+ int *realnump, gdb_byte *valuep)
{
struct sparc_frame_cache *cache =
sparc32nbsd_sigcontext_frame_cache (next_frame, this_cache);
- trad_frame_prev_register (next_frame, cache->saved_regs, regnum,
- optimizedp, lvalp, addrp, realnump, valuep);
+ trad_frame_get_prev_register (next_frame, cache->saved_regs, regnum,
+ optimizedp, lvalp, addrp, realnump, valuep);
}
static const struct frame_unwind sparc32nbsd_sigcontext_frame_unwind =
return NULL;
}
\f
+/* Return the address of a system call's alternative return
+ address. */
-/* Return non-zero if we are in a shared library trampoline code stub. */
-
-static int
-sparcnbsd_aout_in_solib_call_trampoline (CORE_ADDR pc, char *name)
+CORE_ADDR
+sparcnbsd_step_trap (struct frame_info *frame, unsigned long insn)
{
- return (name && !strcmp (name, "_DYNAMIC"));
+ if ((X_I (insn) == 0 && X_RS1 (insn) == 0 && X_RS2 (insn) == 0)
+ || (X_I (insn) == 1 && X_RS1 (insn) == 0 && (insn & 0x7f) == 0))
+ {
+ /* "New" system call. */
+ ULONGEST number = get_frame_register_unsigned (frame, SPARC_G1_REGNUM);
+
+ if (number & 0x400)
+ return get_frame_register_unsigned (frame, SPARC_G2_REGNUM);
+ if (number & 0x800)
+ return get_frame_register_unsigned (frame, SPARC_G7_REGNUM);
+ }
+
+ return 0;
}
+\f
static void
sparc32nbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
/* NetBSD 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);
+ set_gdbarch_long_double_format (gdbarch, floatformats_ieee_double);
+
+ tdep->gregset = regset_alloc (gdbarch, sparc32nbsd_supply_gregset, NULL);
+ tdep->sizeof_gregset = 20 * 4;
+
+ tdep->fpregset = regset_alloc (gdbarch, sparc32nbsd_supply_fpregset, NULL);
+ tdep->sizeof_fpregset = 33 * 4;
+
+ /* Make sure we can single-step "new" syscalls. */
+ tdep->step_trap = sparcnbsd_step_trap;
- set_gdbarch_pc_in_sigtramp (gdbarch, sparc32nbsd_pc_in_sigtramp);
frame_unwind_append_sniffer (gdbarch, sparc32nbsd_sigtramp_frame_sniffer);
}
sparc32nbsd_aout_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
sparc32nbsd_init_abi (info, gdbarch);
-
- set_gdbarch_in_solib_call_trampoline
- (gdbarch, sparcnbsd_aout_in_solib_call_trampoline);
}
-static void
+void
sparc32nbsd_elf_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
sparc32nbsd_init_abi (info, gdbarch);
set_solib_svr4_fetch_link_map_offsets
- (gdbarch, nbsd_ilp32_solib_svr4_fetch_link_map_offsets);
+ (gdbarch, svr4_ilp32_fetch_link_map_offsets);
}
static enum gdb_osabi
return GDB_OSABI_UNKNOWN;
}
+/* OpenBSD uses the traditional NetBSD core file format, even for
+ ports that use ELF. Therefore, if the default OS ABI is OpenBSD
+ ELF, we return that instead of NetBSD a.out. This is mainly for
+ the benfit of OpenBSD/sparc64, which inherits the sniffer below
+ since we include this file for an OpenBSD/sparc64 target. For
+ OpenBSD/sparc, the NetBSD a.out OS ABI is probably similar enough
+ to both the OpenBSD a.out and the OpenBSD ELF OS ABI. */
+#if defined (GDB_OSABI_DEFAULT) && (GDB_OSABI_DEFAULT == GDB_OSABI_OPENBSD_ELF)
+#define GDB_OSABI_NETBSD_CORE GDB_OSABI_OPENBSD_ELF
+#else
+#define GDB_OSABI_NETBSD_CORE GDB_OSABI_NETBSD_AOUT
+#endif
+
+static enum gdb_osabi
+sparcnbsd_core_osabi_sniffer (bfd *abfd)
+{
+ if (strcmp (bfd_get_target (abfd), "netbsd-core") == 0)
+ return GDB_OSABI_NETBSD_CORE;
+
+ return GDB_OSABI_UNKNOWN;
+}
+
\f
/* Provide a prototype to silence -Wmissing-prototypes. */
void _initialize_sparcnbsd_tdep (void);
gdbarch_register_osabi_sniffer (bfd_arch_sparc, bfd_target_aout_flavour,
sparcnbsd_aout_osabi_sniffer);
+ /* BFD doesn't set a flavour for NetBSD style a.out core files. */
+ gdbarch_register_osabi_sniffer (bfd_arch_sparc, bfd_target_unknown_flavour,
+ sparcnbsd_core_osabi_sniffer);
+
gdbarch_register_osabi (bfd_arch_sparc, 0, GDB_OSABI_NETBSD_AOUT,
sparc32nbsd_aout_init_abi);
gdbarch_register_osabi (bfd_arch_sparc, 0, GDB_OSABI_NETBSD_ELF,
sparc32nbsd_elf_init_abi);
-
- add_core_fns (&sparcnbsd_core_fns);
- add_core_fns (&sparcnbsd_elfcore_fns);
}
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