| /* Target-dependent code for GNU/Linux UltraSPARC. |
| |
| Copyright (C) 2003-2013 Free Software Foundation, Inc. |
| |
| This file is part of GDB. |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 3 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| |
| #include "defs.h" |
| #include "frame.h" |
| #include "frame-unwind.h" |
| #include "dwarf2-frame.h" |
| #include "regset.h" |
| #include "regcache.h" |
| #include "gdbarch.h" |
| #include "gdbcore.h" |
| #include "osabi.h" |
| #include "solib-svr4.h" |
| #include "symtab.h" |
| #include "trad-frame.h" |
| #include "tramp-frame.h" |
| #include "xml-syscall.h" |
| #include "linux-tdep.h" |
| |
| /* The syscall's XML filename for sparc 64-bit. */ |
| #define XML_SYSCALL_FILENAME_SPARC64 "syscalls/sparc64-linux.xml" |
| |
| #include "sparc64-tdep.h" |
| |
| /* Signal trampoline support. */ |
| |
| static void sparc64_linux_sigframe_init (const struct tramp_frame *self, |
| struct frame_info *this_frame, |
| struct trad_frame_cache *this_cache, |
| CORE_ADDR func); |
| |
| /* See sparc-linux-tdep.c for details. Note that 64-bit binaries only |
| use RT signals. */ |
| |
| static const struct tramp_frame sparc64_linux_rt_sigframe = |
| { |
| SIGTRAMP_FRAME, |
| 4, |
| { |
| { 0x82102065, -1 }, /* mov __NR_rt_sigreturn, %g1 */ |
| { 0x91d0206d, -1 }, /* ta 0x6d */ |
| { TRAMP_SENTINEL_INSN, -1 } |
| }, |
| sparc64_linux_sigframe_init |
| }; |
| |
| static void |
| sparc64_linux_sigframe_init (const struct tramp_frame *self, |
| struct frame_info *this_frame, |
| struct trad_frame_cache *this_cache, |
| CORE_ADDR func) |
| { |
| CORE_ADDR base, addr, sp_addr; |
| int regnum; |
| |
| base = get_frame_register_unsigned (this_frame, SPARC_O1_REGNUM); |
| base += 128; |
| |
| /* Offsets from <bits/sigcontext.h>. */ |
| |
| /* Since %g0 is always zero, keep the identity encoding. */ |
| addr = base + 8; |
| sp_addr = base + ((SPARC_SP_REGNUM - SPARC_G0_REGNUM) * 8); |
| for (regnum = SPARC_G1_REGNUM; regnum <= SPARC_O7_REGNUM; regnum++) |
| { |
| trad_frame_set_reg_addr (this_cache, regnum, addr); |
| addr += 8; |
| } |
| |
| trad_frame_set_reg_addr (this_cache, SPARC64_STATE_REGNUM, addr + 0); |
| trad_frame_set_reg_addr (this_cache, SPARC64_PC_REGNUM, addr + 8); |
| trad_frame_set_reg_addr (this_cache, SPARC64_NPC_REGNUM, addr + 16); |
| trad_frame_set_reg_addr (this_cache, SPARC64_Y_REGNUM, addr + 24); |
| trad_frame_set_reg_addr (this_cache, SPARC64_FPRS_REGNUM, addr + 28); |
| |
| base = get_frame_register_unsigned (this_frame, SPARC_SP_REGNUM); |
| if (base & 1) |
| base += BIAS; |
| |
| addr = get_frame_memory_unsigned (this_frame, sp_addr, 8); |
| if (addr & 1) |
| addr += BIAS; |
| |
| for (regnum = SPARC_L0_REGNUM; regnum <= SPARC_I7_REGNUM; regnum++) |
| { |
| trad_frame_set_reg_addr (this_cache, regnum, addr); |
| addr += 8; |
| } |
| trad_frame_set_id (this_cache, frame_id_build (base, func)); |
| } |
| |
| /* Return the address of a system call's alternative return |
| address. */ |
| |
| static CORE_ADDR |
| sparc64_linux_step_trap (struct frame_info *frame, unsigned long insn) |
| { |
| if (insn == 0x91d0206d) |
| { |
| struct gdbarch *gdbarch = get_frame_arch (frame); |
| enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| |
| ULONGEST sp = get_frame_register_unsigned (frame, SPARC_SP_REGNUM); |
| if (sp & 1) |
| sp += BIAS; |
| |
| /* The kernel puts the sigreturn registers on the stack, |
| and this is where the signal unwinding state is take from |
| when returning from a signal. |
| |
| A siginfo_t sits 192 bytes from the base of the stack. This |
| siginfo_t is 128 bytes, and is followed by the sigreturn |
| register save area. The saved PC sits at a 136 byte offset |
| into there. */ |
| |
| return read_memory_unsigned_integer (sp + 192 + 128 + 136, |
| 8, byte_order); |
| } |
| |
| return 0; |
| } |
| |
| |
| const struct sparc_gregset sparc64_linux_core_gregset = |
| { |
| 32 * 8, /* %tstate */ |
| 33 * 8, /* %tpc */ |
| 34 * 8, /* %tnpc */ |
| 35 * 8, /* %y */ |
| -1, /* %wim */ |
| -1, /* %tbr */ |
| 1 * 8, /* %g1 */ |
| 16 * 8, /* %l0 */ |
| 8, /* y size */ |
| }; |
| |
| |
| static void |
| sparc64_linux_supply_core_gregset (const struct regset *regset, |
| struct regcache *regcache, |
| int regnum, const void *gregs, size_t len) |
| { |
| sparc64_supply_gregset (&sparc64_linux_core_gregset, |
| regcache, regnum, gregs); |
| } |
| |
| static void |
| sparc64_linux_collect_core_gregset (const struct regset *regset, |
| const struct regcache *regcache, |
| int regnum, void *gregs, size_t len) |
| { |
| sparc64_collect_gregset (&sparc64_linux_core_gregset, |
| regcache, regnum, gregs); |
| } |
| |
| static void |
| sparc64_linux_supply_core_fpregset (const struct regset *regset, |
| struct regcache *regcache, |
| int regnum, const void *fpregs, size_t len) |
| { |
| sparc64_supply_fpregset (&sparc64_bsd_fpregset, regcache, regnum, fpregs); |
| } |
| |
| static void |
| sparc64_linux_collect_core_fpregset (const struct regset *regset, |
| const struct regcache *regcache, |
| int regnum, void *fpregs, size_t len) |
| { |
| sparc64_collect_fpregset (&sparc64_bsd_fpregset, regcache, regnum, fpregs); |
| } |
| |
| /* Set the program counter for process PTID to PC. */ |
| |
| #define TSTATE_SYSCALL 0x0000000000000020ULL |
| |
| static void |
| sparc64_linux_write_pc (struct regcache *regcache, CORE_ADDR pc) |
| { |
| struct gdbarch_tdep *tdep = gdbarch_tdep (get_regcache_arch (regcache)); |
| ULONGEST state; |
| |
| regcache_cooked_write_unsigned (regcache, tdep->pc_regnum, pc); |
| regcache_cooked_write_unsigned (regcache, tdep->npc_regnum, pc + 4); |
| |
| /* Clear the "in syscall" bit to prevent the kernel from |
| messing with the PCs we just installed, if we happen to be |
| within an interrupted system call that the kernel wants to |
| restart. |
| |
| Note that after we return from the dummy call, the TSTATE et al. |
| registers will be automatically restored, and the kernel |
| continues to restart the system call at this point. */ |
| regcache_cooked_read_unsigned (regcache, SPARC64_STATE_REGNUM, &state); |
| state &= ~TSTATE_SYSCALL; |
| regcache_cooked_write_unsigned (regcache, SPARC64_STATE_REGNUM, state); |
| } |
| |
| static LONGEST |
| sparc64_linux_get_syscall_number (struct gdbarch *gdbarch, |
| ptid_t ptid) |
| { |
| struct regcache *regcache = get_thread_regcache (ptid); |
| enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| /* The content of a register. */ |
| gdb_byte buf[8]; |
| /* The result. */ |
| LONGEST ret; |
| |
| /* Getting the system call number from the register. |
| When dealing with the sparc architecture, this information |
| is stored at the %g1 register. */ |
| regcache_cooked_read (regcache, SPARC_G1_REGNUM, buf); |
| |
| ret = extract_signed_integer (buf, 8, byte_order); |
| |
| return ret; |
| } |
| |
| |
| |
| static void |
| sparc64_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
| { |
| struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| |
| linux_init_abi (info, gdbarch); |
| |
| tdep->gregset = regset_alloc (gdbarch, sparc64_linux_supply_core_gregset, |
| sparc64_linux_collect_core_gregset); |
| tdep->sizeof_gregset = 288; |
| |
| tdep->fpregset = regset_alloc (gdbarch, sparc64_linux_supply_core_fpregset, |
| sparc64_linux_collect_core_fpregset); |
| tdep->sizeof_fpregset = 280; |
| |
| tramp_frame_prepend_unwinder (gdbarch, &sparc64_linux_rt_sigframe); |
| |
| /* Hook in the DWARF CFI frame unwinder. */ |
| dwarf2_append_unwinders (gdbarch); |
| |
| sparc64_init_abi (info, gdbarch); |
| |
| /* GNU/Linux has SVR4-style shared libraries... */ |
| set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target); |
| set_solib_svr4_fetch_link_map_offsets |
| (gdbarch, svr4_lp64_fetch_link_map_offsets); |
| |
| /* ...which means that we need some special handling when doing |
| prologue analysis. */ |
| tdep->plt_entry_size = 16; |
| |
| /* Enable TLS support. */ |
| set_gdbarch_fetch_tls_load_module_address (gdbarch, |
| svr4_fetch_objfile_link_map); |
| |
| /* Make sure we can single-step over signal return system calls. */ |
| tdep->step_trap = sparc64_linux_step_trap; |
| |
| set_gdbarch_write_pc (gdbarch, sparc64_linux_write_pc); |
| |
| /* Functions for 'catch syscall'. */ |
| set_xml_syscall_file_name (XML_SYSCALL_FILENAME_SPARC64); |
| set_gdbarch_get_syscall_number (gdbarch, |
| sparc64_linux_get_syscall_number); |
| } |
| |
| |
| /* Provide a prototype to silence -Wmissing-prototypes. */ |
| extern void _initialize_sparc64_linux_tdep (void); |
| |
| void |
| _initialize_sparc64_linux_tdep (void) |
| { |
| gdbarch_register_osabi (bfd_arch_sparc, bfd_mach_sparc_v9, |
| GDB_OSABI_LINUX, sparc64_linux_init_abi); |
| } |