370 lines
11 KiB
C
370 lines
11 KiB
C
/* Target-dependent code for NetBSD/sparc.
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Copyright (C) 2002, 2003, 2004, 2006, 2007 Free Software Foundation, Inc.
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Contributed by Wasabi Systems, 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 "frame.h"
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#include "frame-unwind.h"
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#include "gdbcore.h"
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#include "gdbtypes.h"
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#include "osabi.h"
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#include "regcache.h"
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#include "regset.h"
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#include "solib-svr4.h"
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#include "symtab.h"
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#include "trad-frame.h"
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#include "gdb_assert.h"
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#include "gdb_string.h"
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#include "sparc-tdep.h"
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#include "nbsd-tdep.h"
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/* Macros to extract fields from SPARC instructions. */
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#define X_RS1(i) (((i) >> 14) & 0x1f)
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#define X_RS2(i) ((i) & 0x1f)
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#define X_I(i) (((i) >> 13) & 1)
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const struct sparc_gregset sparc32nbsd_gregset =
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{
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0 * 4, /* %psr */
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1 * 4, /* %pc */
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2 * 4, /* %npc */
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3 * 4, /* %y */
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-1, /* %wim */
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-1, /* %tbr */
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5 * 4, /* %g1 */
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-1 /* %l0 */
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};
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static void
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sparc32nbsd_supply_gregset (const struct regset *regset,
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struct regcache *regcache,
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int regnum, const void *gregs, size_t len)
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{
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sparc32_supply_gregset (&sparc32nbsd_gregset, regcache, regnum, gregs);
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/* Traditional NetBSD core files don't use multiple register sets.
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Instead, the general-purpose and floating-point registers are
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lumped together in a single section. */
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if (len >= 212)
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sparc32_supply_fpregset (regcache, regnum, (const char *) gregs + 80);
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}
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static void
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sparc32nbsd_supply_fpregset (const struct regset *regset,
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struct regcache *regcache,
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int regnum, const void *fpregs, size_t len)
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{
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sparc32_supply_fpregset (regcache, regnum, fpregs);
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}
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/* Signal trampolines. */
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/* The following variables describe the location of an on-stack signal
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trampoline. The current values correspond to the memory layout for
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NetBSD 1.3 and up. These shouldn't be necessary for NetBSD 2.0 and
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up, since NetBSD uses signal trampolines provided by libc now. */
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static const CORE_ADDR sparc32nbsd_sigtramp_start = 0xeffffef0;
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static const CORE_ADDR sparc32nbsd_sigtramp_end = 0xeffffff0;
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static int
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sparc32nbsd_pc_in_sigtramp (CORE_ADDR pc, char *name)
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{
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if (pc >= sparc32nbsd_sigtramp_start && pc < sparc32nbsd_sigtramp_end)
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return 1;
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return nbsd_pc_in_sigtramp (pc, name);
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}
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struct trad_frame_saved_reg *
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sparc32nbsd_sigcontext_saved_regs (struct frame_info *next_frame)
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{
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struct trad_frame_saved_reg *saved_regs;
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CORE_ADDR addr, sigcontext_addr;
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int regnum, delta;
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ULONGEST psr;
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saved_regs = trad_frame_alloc_saved_regs (next_frame);
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/* We find the appropriate instance of `struct sigcontext' at a
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fixed offset in the signal frame. */
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addr = frame_unwind_register_unsigned (next_frame, SPARC_FP_REGNUM);
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sigcontext_addr = addr + 64 + 16;
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/* The registers are saved in bits and pieces scattered all over the
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place. The code below records their location on the assumption
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that the part of the signal trampoline that saves the state has
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been executed. */
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saved_regs[SPARC_SP_REGNUM].addr = sigcontext_addr + 8;
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saved_regs[SPARC32_PC_REGNUM].addr = sigcontext_addr + 12;
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saved_regs[SPARC32_NPC_REGNUM].addr = sigcontext_addr + 16;
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saved_regs[SPARC32_PSR_REGNUM].addr = sigcontext_addr + 20;
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saved_regs[SPARC_G1_REGNUM].addr = sigcontext_addr + 24;
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saved_regs[SPARC_O0_REGNUM].addr = sigcontext_addr + 28;
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/* The remaining `global' registers and %y are saved in the `local'
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registers. */
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delta = SPARC_L0_REGNUM - SPARC_G0_REGNUM;
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for (regnum = SPARC_G2_REGNUM; regnum <= SPARC_G7_REGNUM; regnum++)
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saved_regs[regnum].realreg = regnum + delta;
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saved_regs[SPARC32_Y_REGNUM].realreg = SPARC_L1_REGNUM;
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/* The remaining `out' registers can be found in the current frame's
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`in' registers. */
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delta = SPARC_I0_REGNUM - SPARC_O0_REGNUM;
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for (regnum = SPARC_O1_REGNUM; regnum <= SPARC_O5_REGNUM; regnum++)
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saved_regs[regnum].realreg = regnum + delta;
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saved_regs[SPARC_O7_REGNUM].realreg = SPARC_I7_REGNUM;
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/* The `local' and `in' registers have been saved in the register
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save area. */
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addr = saved_regs[SPARC_SP_REGNUM].addr;
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addr = get_frame_memory_unsigned (next_frame, addr, 4);
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for (regnum = SPARC_L0_REGNUM;
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regnum <= SPARC_I7_REGNUM; regnum++, addr += 4)
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saved_regs[regnum].addr = addr;
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/* Handle StackGhost. */
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{
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ULONGEST wcookie = sparc_fetch_wcookie ();
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if (wcookie != 0)
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{
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ULONGEST i7;
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addr = saved_regs[SPARC_I7_REGNUM].addr;
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i7 = get_frame_memory_unsigned (next_frame, addr, 4);
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trad_frame_set_value (saved_regs, SPARC_I7_REGNUM, i7 ^ wcookie);
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}
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}
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/* The floating-point registers are only saved if the EF bit in %prs
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has been set. */
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#define PSR_EF 0x00001000
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addr = saved_regs[SPARC32_PSR_REGNUM].addr;
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psr = get_frame_memory_unsigned (next_frame, addr, 4);
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if (psr & PSR_EF)
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{
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CORE_ADDR sp;
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sp = frame_unwind_register_unsigned (next_frame, SPARC_SP_REGNUM);
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saved_regs[SPARC32_FSR_REGNUM].addr = sp + 96;
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for (regnum = SPARC_F0_REGNUM, addr = sp + 96 + 8;
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regnum <= SPARC_F31_REGNUM; regnum++, addr += 4)
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saved_regs[regnum].addr = addr;
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}
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return saved_regs;
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}
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static struct sparc_frame_cache *
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sparc32nbsd_sigcontext_frame_cache (struct frame_info *next_frame,
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void **this_cache)
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{
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struct sparc_frame_cache *cache;
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CORE_ADDR addr;
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if (*this_cache)
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return *this_cache;
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cache = sparc_frame_cache (next_frame, this_cache);
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gdb_assert (cache == *this_cache);
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/* If we couldn't find the frame's function, we're probably dealing
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with an on-stack signal trampoline. */
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if (cache->pc == 0)
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{
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cache->pc = sparc32nbsd_sigtramp_start;
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/* Since we couldn't find the frame's function, the cache was
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initialized under the assumption that we're frameless. */
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cache->frameless_p = 0;
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addr = frame_unwind_register_unsigned (next_frame, SPARC_FP_REGNUM);
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cache->base = addr;
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}
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cache->saved_regs = sparc32nbsd_sigcontext_saved_regs (next_frame);
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return cache;
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}
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static void
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sparc32nbsd_sigcontext_frame_this_id (struct frame_info *next_frame,
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void **this_cache,
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struct frame_id *this_id)
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{
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struct sparc_frame_cache *cache =
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sparc32nbsd_sigcontext_frame_cache (next_frame, this_cache);
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(*this_id) = frame_id_build (cache->base, cache->pc);
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}
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static void
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sparc32nbsd_sigcontext_frame_prev_register (struct frame_info *next_frame,
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void **this_cache,
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int regnum, int *optimizedp,
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enum lval_type *lvalp,
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CORE_ADDR *addrp,
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int *realnump, gdb_byte *valuep)
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{
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struct sparc_frame_cache *cache =
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sparc32nbsd_sigcontext_frame_cache (next_frame, this_cache);
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trad_frame_get_prev_register (next_frame, cache->saved_regs, regnum,
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optimizedp, lvalp, addrp, realnump, valuep);
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}
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static const struct frame_unwind sparc32nbsd_sigcontext_frame_unwind =
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{
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SIGTRAMP_FRAME,
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sparc32nbsd_sigcontext_frame_this_id,
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sparc32nbsd_sigcontext_frame_prev_register
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};
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static const struct frame_unwind *
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sparc32nbsd_sigtramp_frame_sniffer (struct frame_info *next_frame)
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{
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CORE_ADDR pc = frame_pc_unwind (next_frame);
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char *name;
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find_pc_partial_function (pc, &name, NULL, NULL);
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if (sparc32nbsd_pc_in_sigtramp (pc, name))
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{
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if (name == NULL || strncmp (name, "__sigtramp_sigcontext", 21))
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return &sparc32nbsd_sigcontext_frame_unwind;
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}
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return NULL;
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}
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/* Return the address of a system call's alternative return
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address. */
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CORE_ADDR
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sparcnbsd_step_trap (struct frame_info *frame, unsigned long insn)
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{
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if ((X_I (insn) == 0 && X_RS1 (insn) == 0 && X_RS2 (insn) == 0)
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|| (X_I (insn) == 1 && X_RS1 (insn) == 0 && (insn & 0x7f) == 0))
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{
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/* "New" system call. */
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ULONGEST number = get_frame_register_unsigned (frame, SPARC_G1_REGNUM);
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if (number & 0x400)
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return get_frame_register_unsigned (frame, SPARC_G2_REGNUM);
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if (number & 0x800)
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return get_frame_register_unsigned (frame, SPARC_G7_REGNUM);
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}
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return 0;
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}
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static void
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sparc32nbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
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{
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struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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/* NetBSD doesn't support the 128-bit `long double' from the psABI. */
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set_gdbarch_long_double_bit (gdbarch, 64);
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set_gdbarch_long_double_format (gdbarch, floatformats_ieee_double);
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tdep->gregset = regset_alloc (gdbarch, sparc32nbsd_supply_gregset, NULL);
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tdep->sizeof_gregset = 20 * 4;
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tdep->fpregset = regset_alloc (gdbarch, sparc32nbsd_supply_fpregset, NULL);
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tdep->sizeof_fpregset = 33 * 4;
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/* Make sure we can single-step "new" syscalls. */
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tdep->step_trap = sparcnbsd_step_trap;
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frame_unwind_append_sniffer (gdbarch, sparc32nbsd_sigtramp_frame_sniffer);
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}
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static void
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sparc32nbsd_aout_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
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{
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sparc32nbsd_init_abi (info, gdbarch);
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}
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void
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sparc32nbsd_elf_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
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{
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sparc32nbsd_init_abi (info, gdbarch);
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set_solib_svr4_fetch_link_map_offsets
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(gdbarch, svr4_ilp32_fetch_link_map_offsets);
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}
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static enum gdb_osabi
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sparcnbsd_aout_osabi_sniffer (bfd *abfd)
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{
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if (strcmp (bfd_get_target (abfd), "a.out-sparc-netbsd") == 0)
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return GDB_OSABI_NETBSD_AOUT;
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return GDB_OSABI_UNKNOWN;
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}
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/* OpenBSD uses the traditional NetBSD core file format, even for
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ports that use ELF. Therefore, if the default OS ABI is OpenBSD
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ELF, we return that instead of NetBSD a.out. This is mainly for
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the benfit of OpenBSD/sparc64, which inherits the sniffer below
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since we include this file for an OpenBSD/sparc64 target. For
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OpenBSD/sparc, the NetBSD a.out OS ABI is probably similar enough
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to both the OpenBSD a.out and the OpenBSD ELF OS ABI. */
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#if defined (GDB_OSABI_DEFAULT) && (GDB_OSABI_DEFAULT == GDB_OSABI_OPENBSD_ELF)
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#define GDB_OSABI_NETBSD_CORE GDB_OSABI_OPENBSD_ELF
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#else
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#define GDB_OSABI_NETBSD_CORE GDB_OSABI_NETBSD_AOUT
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#endif
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static enum gdb_osabi
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sparcnbsd_core_osabi_sniffer (bfd *abfd)
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{
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if (strcmp (bfd_get_target (abfd), "netbsd-core") == 0)
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return GDB_OSABI_NETBSD_CORE;
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return GDB_OSABI_UNKNOWN;
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}
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/* Provide a prototype to silence -Wmissing-prototypes. */
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void _initialize_sparcnbsd_tdep (void);
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void
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_initialize_sparnbsd_tdep (void)
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{
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gdbarch_register_osabi_sniffer (bfd_arch_sparc, bfd_target_aout_flavour,
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sparcnbsd_aout_osabi_sniffer);
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/* BFD doesn't set a flavour for NetBSD style a.out core files. */
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gdbarch_register_osabi_sniffer (bfd_arch_sparc, bfd_target_unknown_flavour,
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sparcnbsd_core_osabi_sniffer);
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gdbarch_register_osabi (bfd_arch_sparc, 0, GDB_OSABI_NETBSD_AOUT,
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sparc32nbsd_aout_init_abi);
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gdbarch_register_osabi (bfd_arch_sparc, 0, GDB_OSABI_NETBSD_ELF,
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sparc32nbsd_elf_init_abi);
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}
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