354 lines
11 KiB
C
354 lines
11 KiB
C
/* Target-dependent code for GNU/Linux UltraSPARC.
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Copyright (C) 2003-2016 Free Software Foundation, 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 "dwarf2-frame.h"
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#include "regset.h"
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#include "regcache.h"
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#include "gdbarch.h"
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#include "gdbcore.h"
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#include "osabi.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 "tramp-frame.h"
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#include "xml-syscall.h"
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#include "linux-tdep.h"
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/* The syscall's XML filename for sparc 64-bit. */
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#define XML_SYSCALL_FILENAME_SPARC64 "syscalls/sparc64-linux.xml"
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#include "sparc64-tdep.h"
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/* Signal trampoline support. */
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static void sparc64_linux_sigframe_init (const struct tramp_frame *self,
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struct frame_info *this_frame,
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struct trad_frame_cache *this_cache,
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CORE_ADDR func);
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/* See sparc-linux-tdep.c for details. Note that 64-bit binaries only
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use RT signals. */
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static const struct tramp_frame sparc64_linux_rt_sigframe =
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{
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SIGTRAMP_FRAME,
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4,
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{
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{ 0x82102065, -1 }, /* mov __NR_rt_sigreturn, %g1 */
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{ 0x91d0206d, -1 }, /* ta 0x6d */
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{ TRAMP_SENTINEL_INSN, -1 }
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},
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sparc64_linux_sigframe_init
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};
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static void
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sparc64_linux_sigframe_init (const struct tramp_frame *self,
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struct frame_info *this_frame,
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struct trad_frame_cache *this_cache,
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CORE_ADDR func)
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{
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CORE_ADDR base, addr, sp_addr;
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int regnum;
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base = get_frame_register_unsigned (this_frame, SPARC_O1_REGNUM);
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base += 128;
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/* Offsets from <bits/sigcontext.h>. */
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/* Since %g0 is always zero, keep the identity encoding. */
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addr = base + 8;
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sp_addr = base + ((SPARC_SP_REGNUM - SPARC_G0_REGNUM) * 8);
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for (regnum = SPARC_G1_REGNUM; regnum <= SPARC_O7_REGNUM; regnum++)
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{
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trad_frame_set_reg_addr (this_cache, regnum, addr);
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addr += 8;
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}
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trad_frame_set_reg_addr (this_cache, SPARC64_STATE_REGNUM, addr + 0);
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trad_frame_set_reg_addr (this_cache, SPARC64_PC_REGNUM, addr + 8);
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trad_frame_set_reg_addr (this_cache, SPARC64_NPC_REGNUM, addr + 16);
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trad_frame_set_reg_addr (this_cache, SPARC64_Y_REGNUM, addr + 24);
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trad_frame_set_reg_addr (this_cache, SPARC64_FPRS_REGNUM, addr + 28);
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base = get_frame_register_unsigned (this_frame, SPARC_SP_REGNUM);
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if (base & 1)
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base += BIAS;
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addr = get_frame_memory_unsigned (this_frame, sp_addr, 8);
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if (addr & 1)
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addr += BIAS;
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for (regnum = SPARC_L0_REGNUM; regnum <= SPARC_I7_REGNUM; regnum++)
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{
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trad_frame_set_reg_addr (this_cache, regnum, addr);
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addr += 8;
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}
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trad_frame_set_id (this_cache, frame_id_build (base, func));
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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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static CORE_ADDR
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sparc64_linux_step_trap (struct frame_info *frame, unsigned long insn)
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{
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/* __NR_rt_sigreturn is 101 */
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if ((insn == 0x91d0206d)
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&& (get_frame_register_unsigned (frame, SPARC_G1_REGNUM) == 101))
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{
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struct gdbarch *gdbarch = get_frame_arch (frame);
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enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
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ULONGEST sp = get_frame_register_unsigned (frame, SPARC_SP_REGNUM);
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if (sp & 1)
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sp += BIAS;
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/* The kernel puts the sigreturn registers on the stack,
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and this is where the signal unwinding state is take from
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when returning from a signal.
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A siginfo_t sits 192 bytes from the base of the stack. This
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siginfo_t is 128 bytes, and is followed by the sigreturn
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register save area. The saved PC sits at a 136 byte offset
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into there. */
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return read_memory_unsigned_integer (sp + 192 + 128 + 136,
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8, byte_order);
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}
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return 0;
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}
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const struct sparc_gregmap sparc64_linux_core_gregmap =
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{
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32 * 8, /* %tstate */
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33 * 8, /* %tpc */
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34 * 8, /* %tnpc */
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35 * 8, /* %y */
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-1, /* %wim */
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-1, /* %tbr */
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1 * 8, /* %g1 */
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16 * 8, /* %l0 */
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8, /* y size */
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};
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static void
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sparc64_linux_supply_core_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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sparc64_supply_gregset (&sparc64_linux_core_gregmap,
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regcache, regnum, gregs);
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}
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static void
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sparc64_linux_collect_core_gregset (const struct regset *regset,
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const struct regcache *regcache,
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int regnum, void *gregs, size_t len)
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{
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sparc64_collect_gregset (&sparc64_linux_core_gregmap,
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regcache, regnum, gregs);
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}
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static void
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sparc64_linux_supply_core_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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sparc64_supply_fpregset (&sparc64_bsd_fpregmap, regcache, regnum, fpregs);
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}
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static void
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sparc64_linux_collect_core_fpregset (const struct regset *regset,
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const struct regcache *regcache,
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int regnum, void *fpregs, size_t len)
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{
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sparc64_collect_fpregset (&sparc64_bsd_fpregmap, regcache, regnum, fpregs);
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}
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/* Set the program counter for process PTID to PC. */
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#define TSTATE_SYSCALL 0x0000000000000020ULL
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static void
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sparc64_linux_write_pc (struct regcache *regcache, CORE_ADDR pc)
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{
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struct gdbarch_tdep *tdep = gdbarch_tdep (get_regcache_arch (regcache));
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ULONGEST state;
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regcache_cooked_write_unsigned (regcache, tdep->pc_regnum, pc);
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regcache_cooked_write_unsigned (regcache, tdep->npc_regnum, pc + 4);
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/* Clear the "in syscall" bit to prevent the kernel from
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messing with the PCs we just installed, if we happen to be
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within an interrupted system call that the kernel wants to
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restart.
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Note that after we return from the dummy call, the TSTATE et al.
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registers will be automatically restored, and the kernel
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continues to restart the system call at this point. */
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regcache_cooked_read_unsigned (regcache, SPARC64_STATE_REGNUM, &state);
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state &= ~TSTATE_SYSCALL;
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regcache_cooked_write_unsigned (regcache, SPARC64_STATE_REGNUM, state);
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}
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static LONGEST
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sparc64_linux_get_syscall_number (struct gdbarch *gdbarch,
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ptid_t ptid)
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{
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struct regcache *regcache = get_thread_regcache (ptid);
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enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
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/* The content of a register. */
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gdb_byte buf[8];
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/* The result. */
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LONGEST ret;
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/* Getting the system call number from the register.
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When dealing with the sparc architecture, this information
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is stored at the %g1 register. */
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regcache_cooked_read (regcache, SPARC_G1_REGNUM, buf);
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ret = extract_signed_integer (buf, 8, byte_order);
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return ret;
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}
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/* Implement the "get_longjmp_target" gdbarch method. */
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static int
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sparc64_linux_get_longjmp_target (struct frame_info *frame, CORE_ADDR *pc)
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{
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struct gdbarch *gdbarch = get_frame_arch (frame);
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struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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CORE_ADDR jb_addr;
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gdb_byte buf[8];
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jb_addr = get_frame_register_unsigned (frame, SPARC_O0_REGNUM);
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/* setjmp and longjmp in SPARC64 are implemented in glibc using the
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setcontext and getcontext system calls respectively. These
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system calls operate on ucontext_t structures, which happen to
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partially have the same structure than jmp_buf. However the
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ucontext returned by getcontext, and thus the jmp_buf structure
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returned by setjmp, contains the context of the trap instruction
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in the glibc __[sig]setjmp wrapper, not the context of the user
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code calling setjmp.
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%o7 in the jmp_buf structure is stored at offset 18*8 in the
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mc_gregs array, which is itself located at offset 32 into
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jmp_buf. See bits/setjmp.h. This register contains the address
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of the 'call setjmp' instruction in user code.
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In order to determine the longjmp target address in the
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initiating frame we need to examine the call instruction itself,
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in particular whether the annul bit is set. If it is not set
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then we need to jump over the instruction at the delay slot. */
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if (target_read_memory (jb_addr + 32 + (18 * 8), buf, 8))
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return 0;
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*pc = extract_unsigned_integer (buf, 8, gdbarch_byte_order (gdbarch));
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if (!sparc_is_annulled_branch_insn (*pc))
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*pc += 4; /* delay slot insn */
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*pc += 4; /* call insn */
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return 1;
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}
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static const struct regset sparc64_linux_gregset =
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{
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NULL,
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sparc64_linux_supply_core_gregset,
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sparc64_linux_collect_core_gregset
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};
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static const struct regset sparc64_linux_fpregset =
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{
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NULL,
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sparc64_linux_supply_core_fpregset,
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sparc64_linux_collect_core_fpregset
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};
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static void
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sparc64_linux_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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linux_init_abi (info, gdbarch);
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tdep->gregset = &sparc64_linux_gregset;
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tdep->sizeof_gregset = 288;
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tdep->fpregset = &sparc64_linux_fpregset;
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tdep->sizeof_fpregset = 280;
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tramp_frame_prepend_unwinder (gdbarch, &sparc64_linux_rt_sigframe);
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/* Hook in the DWARF CFI frame unwinder. */
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dwarf2_append_unwinders (gdbarch);
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sparc64_init_abi (info, gdbarch);
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/* GNU/Linux has SVR4-style shared libraries... */
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set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
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set_solib_svr4_fetch_link_map_offsets
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(gdbarch, svr4_lp64_fetch_link_map_offsets);
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/* ...which means that we need some special handling when doing
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prologue analysis. */
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tdep->plt_entry_size = 16;
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/* Enable TLS support. */
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set_gdbarch_fetch_tls_load_module_address (gdbarch,
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svr4_fetch_objfile_link_map);
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/* Make sure we can single-step over signal return system calls. */
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tdep->step_trap = sparc64_linux_step_trap;
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/* Make sure we can single-step over longjmp calls. */
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set_gdbarch_get_longjmp_target (gdbarch, sparc64_linux_get_longjmp_target);
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set_gdbarch_write_pc (gdbarch, sparc64_linux_write_pc);
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/* Functions for 'catch syscall'. */
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set_xml_syscall_file_name (gdbarch, XML_SYSCALL_FILENAME_SPARC64);
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set_gdbarch_get_syscall_number (gdbarch,
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sparc64_linux_get_syscall_number);
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}
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/* Provide a prototype to silence -Wmissing-prototypes. */
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extern void _initialize_sparc64_linux_tdep (void);
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void
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_initialize_sparc64_linux_tdep (void)
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{
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gdbarch_register_osabi (bfd_arch_sparc, bfd_mach_sparc_v9,
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GDB_OSABI_LINUX, sparc64_linux_init_abi);
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}
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