/* Native-dependent code for GNU/Linux x86-64. Copyright 2001, 2002 Free Software Foundation, Inc. Contributed by Jiri Smid, SuSE Labs. 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 2 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, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include "defs.h" #include "inferior.h" #include "gdbcore.h" #include "regcache.h" #include "i387-nat.h" #include "gdb_assert.h" #include "x86-64-tdep.h" #include #include #include #include #include /* Mapping between the general-purpose registers in `struct user' format and GDB's register array layout. */ static int x86_64_regmap[] = { RAX, RBX, RCX, RDX, RSI, RDI, RBP, RSP, R8, R9, R10, R11, R12, R13, R14, R15, RIP, EFLAGS, DS, ES, FS, GS }; static unsigned long x86_64_linux_dr_get (int regnum) { int tid; unsigned long value; /* FIXME: kettenis/2001-01-29: It's not clear what we should do with multi-threaded processes here. For now, pretend there is just one thread. */ tid = PIDGET (inferior_ptid); /* FIXME: kettenis/2001-03-27: Calling perror_with_name if the ptrace call fails breaks debugging remote targets. The correct way to fix this is to add the hardware breakpoint and watchpoint stuff to the target vectore. For now, just return zero if the ptrace call fails. */ errno = 0; value = ptrace (PT_READ_U, tid, offsetof (struct user, u_debugreg[regnum]), 0); if (errno != 0) #if 0 perror_with_name ("Couldn't read debug register"); #else return 0; #endif return value; } static void x86_64_linux_dr_set (int regnum, unsigned long value) { int tid; /* FIXME: kettenis/2001-01-29: It's not clear what we should do with multi-threaded processes here. For now, pretend there is just one thread. */ tid = PIDGET (inferior_ptid); errno = 0; ptrace (PT_WRITE_U, tid, offsetof (struct user, u_debugreg[regnum]), value); if (errno != 0) perror_with_name ("Couldn't write debug register"); } void x86_64_linux_dr_set_control (unsigned long control) { x86_64_linux_dr_set (DR_CONTROL, control); } void x86_64_linux_dr_set_addr (int regnum, CORE_ADDR addr) { gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR); x86_64_linux_dr_set (DR_FIRSTADDR + regnum, addr); } void x86_64_linux_dr_reset_addr (int regnum) { gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR); x86_64_linux_dr_set (DR_FIRSTADDR + regnum, 0L); } unsigned long x86_64_linux_dr_get_status (void) { return x86_64_linux_dr_get (DR_STATUS); } /* The register sets used in GNU/Linux ELF core-dumps are identical to the register sets used by `ptrace'. */ #define GETREGS_SUPPLIES(regno) \ (0 <= (regno) && (regno) < x86_64_num_gregs) #define GETFPREGS_SUPPLIES(regno) \ (FP0_REGNUM <= (regno) && (regno) <= MXCSR_REGNUM) /* Transfering the general-purpose registers between GDB, inferiors and core files. */ /* Fill GDB's register array with the general-purpose register values in *GREGSETP. */ void supply_gregset (elf_gregset_t * gregsetp) { elf_greg_t *regp = (elf_greg_t *) gregsetp; int i; for (i = 0; i < x86_64_num_gregs; i++) supply_register (i, (char *) (regp + x86_64_regmap[i])); } /* Fill register REGNO (if it is a general-purpose register) in *GREGSETPS with the value in GDB's register array. If REGNO is -1, do this for all registers. */ void fill_gregset (elf_gregset_t * gregsetp, int regno) { elf_greg_t *regp = (elf_greg_t *) gregsetp; int i; for (i = 0; i < x86_64_num_gregs; i++) if ((regno == -1 || regno == i)) read_register_gen (i, (char *) (regp + x86_64_regmap[i])); } /* Fetch all general-purpose registers from process/thread TID and store their values in GDB's register array. */ static void fetch_regs (int tid) { elf_gregset_t regs; if (ptrace (PTRACE_GETREGS, tid, 0, (long) ®s) < 0) perror_with_name ("Couldn't get registers"); supply_gregset (®s); } /* Store all valid general-purpose registers in GDB's register array into the process/thread specified by TID. */ static void store_regs (int tid, int regno) { elf_gregset_t regs; if (ptrace (PTRACE_GETREGS, tid, 0, (long) ®s) < 0) perror_with_name ("Couldn't get registers"); fill_gregset (®s, regno); if (ptrace (PTRACE_SETREGS, tid, 0, (long) ®s) < 0) perror_with_name ("Couldn't write registers"); } /* Transfering floating-point registers between GDB, inferiors and cores. */ /* Fill GDB's register array with the floating-point register values in *FPREGSETP. */ void supply_fpregset (elf_fpregset_t * fpregsetp) { i387_supply_fxsave ((char *) fpregsetp); } /* Fill register REGNO (if it is a floating-point register) in *FPREGSETP with the value in GDB's register array. If REGNO is -1, do this for all registers. */ void fill_fpregset (elf_fpregset_t * fpregsetp, int regno) { i387_fill_fxsave ((char *) fpregsetp, regno); } /* Fetch all floating-point registers from process/thread TID and store thier values in GDB's register array. */ static void fetch_fpregs (int tid) { elf_fpregset_t fpregs; if (ptrace (PTRACE_GETFPREGS, tid, 0, (long) &fpregs) < 0) perror_with_name ("Couldn't get floating point status"); supply_fpregset (&fpregs); } /* Store all valid floating-point registers in GDB's register array into the process/thread specified by TID. */ static void store_fpregs (int tid, int regno) { elf_fpregset_t fpregs; if (ptrace (PTRACE_GETFPREGS, tid, 0, (long) &fpregs) < 0) perror_with_name ("Couldn't get floating point status"); fill_fpregset (&fpregs, regno); if (ptrace (PTRACE_SETFPREGS, tid, 0, (long) &fpregs) < 0) perror_with_name ("Couldn't write floating point status"); } /* Transferring arbitrary registers between GDB and inferior. */ /* Fetch register REGNO from the child process. If REGNO is -1, do this for all registers (including the floating point and SSE registers). */ void fetch_inferior_registers (int regno) { int tid; /* GNU/Linux LWP ID's are process ID's. */ if ((tid = TIDGET (inferior_ptid)) == 0) tid = PIDGET (inferior_ptid); /* Not a threaded program. */ if (regno == -1) { fetch_regs (tid); fetch_fpregs (tid); return; } if (GETREGS_SUPPLIES (regno)) { fetch_regs (tid); return; } if (GETFPREGS_SUPPLIES (regno)) { fetch_fpregs (tid); return; } internal_error (__FILE__, __LINE__, "Got request for bad register number %d.", regno); } /* Store register REGNO back into the child process. If REGNO is -1, do this for all registers (including the floating point and SSE registers). */ void store_inferior_registers (int regno) { int tid; /* GNU/Linux LWP ID's are process ID's. */ if ((tid = TIDGET (inferior_ptid)) == 0) tid = PIDGET (inferior_ptid); /* Not a threaded program. */ if (regno == -1) { store_regs (tid, regno); store_fpregs (tid, regno); return; } if (GETREGS_SUPPLIES (regno)) { store_regs (tid, regno); return; } if (GETFPREGS_SUPPLIES (regno)) { store_fpregs (tid, regno); return; } internal_error (__FILE__, __LINE__, "Got request to store bad register number %d.", regno); } static const unsigned char linux_syscall[] = { 0x0f, 0x05 }; #define LINUX_SYSCALL_LEN (sizeof linux_syscall) /* The system call number is stored in the %rax register. */ #define LINUX_SYSCALL_REGNUM 0 /* %rax */ /* We are specifically interested in the sigreturn and rt_sigreturn system calls. */ #ifndef SYS_sigreturn #define SYS_sigreturn __NR_sigreturn #endif #ifndef SYS_rt_sigreturn #define SYS_rt_sigreturn __NR_rt_sigreturn #endif /* Offset to saved processor flags, from . */ #define LINUX_SIGCONTEXT_EFLAGS_OFFSET (152) /* Offset to saved processor registers from */ #define LINUX_UCONTEXT_SIGCONTEXT_OFFSET (36) /* Interpreting register set info found in core files. */ /* Provide registers to GDB from a core file. CORE_REG_SECT points to an array of bytes, which are the contents of a `note' from a core file which BFD thinks might contain register contents. CORE_REG_SIZE is its size. WHICH says which register set corelow suspects this is: 0 --- the general-purpose register set, in elf_gregset_t format 2 --- the floating-point register set, in elf_fpregset_t format REG_ADDR isn't used on GNU/Linux. */ static void fetch_core_registers (char *core_reg_sect, unsigned core_reg_size, int which, CORE_ADDR reg_addr) { elf_gregset_t gregset; elf_fpregset_t fpregset; switch (which) { case 0: if (core_reg_size != sizeof (gregset)) warning ("Wrong size gregset in core file."); else { memcpy (&gregset, core_reg_sect, sizeof (gregset)); supply_gregset (&gregset); } break; case 2: if (core_reg_size != sizeof (fpregset)) warning ("Wrong size fpregset in core file."); else { memcpy (&fpregset, core_reg_sect, sizeof (fpregset)); supply_fpregset (&fpregset); } break; default: /* We've covered all the kinds of registers we know about here, so this must be something we wouldn't know what to do with anyway. Just ignore it. */ break; } } /* Register that we are able to handle GNU/Linux ELF core file formats. */ static struct core_fns linux_elf_core_fns = { bfd_target_elf_flavour, /* core_flavour */ default_check_format, /* check_format */ default_core_sniffer, /* core_sniffer */ fetch_core_registers, /* core_read_registers */ NULL /* next */ }; #if !defined (offsetof) #define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER) #endif /* Return the address of register REGNUM. BLOCKEND is the value of u.u_ar0, which should point to the registers. */ CORE_ADDR x86_64_register_u_addr (CORE_ADDR blockend, int regnum) { struct user u; CORE_ADDR fpstate; CORE_ADDR ubase; ubase = blockend; if (IS_FP_REGNUM (regnum)) { fpstate = ubase + ((char *) &u.i387.st_space - (char *) &u); return (fpstate + 16 * (regnum - FP0_REGNUM)); } else if (IS_SSE_REGNUM (regnum)) { fpstate = ubase + ((char *) &u.i387.xmm_space - (char *) &u); return (fpstate + 16 * (regnum - XMM0_REGNUM)); } else return (ubase + 8 * x86_64_regmap[regnum]); } void _initialize_x86_64_linux_nat (void) { add_core_fns (&linux_elf_core_fns); } int kernel_u_size (void) { return (sizeof (struct user)); }