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Diffstat (limited to 'gdb/alpha-nat.c')
| -rw-r--r-- | gdb/alpha-nat.c | 297 |
1 files changed, 297 insertions, 0 deletions
diff --git a/gdb/alpha-nat.c b/gdb/alpha-nat.c new file mode 100644 index 0000000..59bd0d8 --- /dev/null +++ b/gdb/alpha-nat.c @@ -0,0 +1,297 @@ +/* Low level Alpha interface, for GDB when running native. + Copyright 1993, 1995, 1996, 1998 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 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 "target.h" +#include <sys/ptrace.h> +#ifdef __linux__ +# include <asm/reg.h> +# include <alpha/ptrace.h> +#else +# include <machine/reg.h> +#endif +#include <sys/user.h> + +/* Prototypes for local functions. */ + +static void fetch_osf_core_registers PARAMS ((char *, + unsigned, int, CORE_ADDR)); +static void fetch_elf_core_registers PARAMS ((char *, + unsigned, int, CORE_ADDR)); + +/* Size of elements in jmpbuf */ + +#define JB_ELEMENT_SIZE 8 + +/* The definition for JB_PC in machine/reg.h is wrong. + And we can't get at the correct definition in setjmp.h as it is + not always available (eg. if _POSIX_SOURCE is defined which is the + default). As the defintion is unlikely to change (see comment + in <setjmp.h>, define the correct value here. */ + +#undef JB_PC +#define JB_PC 2 + +/* Figure out where the longjmp will land. + We expect the first arg to be a pointer to the jmp_buf structure from which + we extract the pc (JB_PC) that we will land at. The pc is copied into PC. + This routine returns true on success. */ + +int +get_longjmp_target (pc) + CORE_ADDR *pc; +{ + CORE_ADDR jb_addr; + char raw_buffer[MAX_REGISTER_RAW_SIZE]; + + jb_addr = read_register(A0_REGNUM); + + if (target_read_memory(jb_addr + JB_PC * JB_ELEMENT_SIZE, raw_buffer, + sizeof(CORE_ADDR))) + return 0; + + *pc = extract_address (raw_buffer, sizeof(CORE_ADDR)); + return 1; +} + +/* Extract the register values out of the core file and store + them where `read_register' will find them. + + CORE_REG_SECT points to the register values themselves, read into memory. + CORE_REG_SIZE is the size of that area. + WHICH says which set of registers we are handling (0 = int, 2 = float + on machines where they are discontiguous). + REG_ADDR is the offset from u.u_ar0 to the register values relative to + core_reg_sect. This is used with old-fashioned core files to + locate the registers in a large upage-plus-stack ".reg" section. + Original upage address X is at location core_reg_sect+x+reg_addr. + */ + +static void +fetch_osf_core_registers (core_reg_sect, core_reg_size, which, reg_addr) + char *core_reg_sect; + unsigned core_reg_size; + int which; + CORE_ADDR reg_addr; +{ + register int regno; + register int addr; + int bad_reg = -1; + + /* Table to map a gdb regnum to an index in the core register section. + The floating point register values are garbage in OSF/1.2 core files. */ + static int core_reg_mapping[NUM_REGS] = + { +#define EFL (EF_SIZE / 8) + EF_V0, EF_T0, EF_T1, EF_T2, EF_T3, EF_T4, EF_T5, EF_T6, + EF_T7, EF_S0, EF_S1, EF_S2, EF_S3, EF_S4, EF_S5, EF_S6, + EF_A0, EF_A1, EF_A2, EF_A3, EF_A4, EF_A5, EF_T8, EF_T9, + EF_T10, EF_T11, EF_RA, EF_T12, EF_AT, EF_GP, EF_SP, -1, + EFL+0, EFL+1, EFL+2, EFL+3, EFL+4, EFL+5, EFL+6, EFL+7, + EFL+8, EFL+9, EFL+10, EFL+11, EFL+12, EFL+13, EFL+14, EFL+15, + EFL+16, EFL+17, EFL+18, EFL+19, EFL+20, EFL+21, EFL+22, EFL+23, + EFL+24, EFL+25, EFL+26, EFL+27, EFL+28, EFL+29, EFL+30, EFL+31, + EF_PC, -1 + }; + static char zerobuf[MAX_REGISTER_RAW_SIZE] = {0}; + + for (regno = 0; regno < NUM_REGS; regno++) + { + if (CANNOT_FETCH_REGISTER (regno)) + { + supply_register (regno, zerobuf); + continue; + } + addr = 8 * core_reg_mapping[regno]; + if (addr < 0 || addr >= core_reg_size) + { + if (bad_reg < 0) + bad_reg = regno; + } + else + { + supply_register (regno, core_reg_sect + addr); + } + } + if (bad_reg >= 0) + { + error ("Register %s not found in core file.", REGISTER_NAME (bad_reg)); + } +} + +static void +fetch_elf_core_registers (core_reg_sect, core_reg_size, which, reg_addr) + char *core_reg_sect; + unsigned core_reg_size; + int which; + CORE_ADDR reg_addr; +{ + if (core_reg_size < 32*8) + { + error ("Core file register section too small (%u bytes).", core_reg_size); + return; + } + + if (which == 2) + { + /* The FPU Registers. */ + memcpy (®isters[REGISTER_BYTE (FP0_REGNUM)], core_reg_sect, 31*8); + memset (®isters[REGISTER_BYTE (FP0_REGNUM+31)], 0, 8); + memset (®ister_valid[FP0_REGNUM], 1, 32); + } + else + { + /* The General Registers. */ + memcpy (®isters[REGISTER_BYTE (V0_REGNUM)], core_reg_sect, 31*8); + memcpy (®isters[REGISTER_BYTE (PC_REGNUM)], core_reg_sect+31*8, 8); + memset (®isters[REGISTER_BYTE (ZERO_REGNUM)], 0, 8); + memset (®ister_valid[V0_REGNUM], 1, 32); + register_valid[PC_REGNUM] = 1; + } +} + + +/* Map gdb internal register number to a ptrace ``address''. + These ``addresses'' are defined in <sys/ptrace.h> */ + +#define REGISTER_PTRACE_ADDR(regno) \ + (regno < FP0_REGNUM ? GPR_BASE + (regno) \ + : regno == PC_REGNUM ? PC \ + : regno >= FP0_REGNUM ? FPR_BASE + ((regno) - FP0_REGNUM) \ + : 0) + +/* Return the ptrace ``address'' of register REGNO. */ + +CORE_ADDR +register_addr (regno, blockend) + int regno; + CORE_ADDR blockend; +{ + return REGISTER_PTRACE_ADDR (regno); +} + +int +kernel_u_size () +{ + return (sizeof (struct user)); +} + +#if defined(USE_PROC_FS) || defined(HAVE_GREGSET_T) +#include <sys/procfs.h> + +/* + * See the comment in m68k-tdep.c regarding the utility of these functions. + */ + +void +supply_gregset (gregsetp) + gregset_t *gregsetp; +{ + register int regi; + register long *regp = ALPHA_REGSET_BASE (gregsetp); + static char zerobuf[MAX_REGISTER_RAW_SIZE] = {0}; + + for (regi = 0; regi < 31; regi++) + supply_register (regi, (char *)(regp + regi)); + + supply_register (PC_REGNUM, (char *)(regp + 31)); + + /* Fill inaccessible registers with zero. */ + supply_register (ZERO_REGNUM, zerobuf); + supply_register (FP_REGNUM, zerobuf); +} + +void +fill_gregset (gregsetp, regno) + gregset_t *gregsetp; + int regno; +{ + int regi; + register long *regp = ALPHA_REGSET_BASE (gregsetp); + + for (regi = 0; regi < 31; regi++) + if ((regno == -1) || (regno == regi)) + *(regp + regi) = *(long *) ®isters[REGISTER_BYTE (regi)]; + + if ((regno == -1) || (regno == PC_REGNUM)) + *(regp + 31) = *(long *) ®isters[REGISTER_BYTE (PC_REGNUM)]; +} + +/* + * Now we do the same thing for floating-point registers. + * Again, see the comments in m68k-tdep.c. + */ + +void +supply_fpregset (fpregsetp) + fpregset_t *fpregsetp; +{ + register int regi; + register long *regp = ALPHA_REGSET_BASE (fpregsetp); + + for (regi = 0; regi < 32; regi++) + supply_register (regi + FP0_REGNUM, (char *)(regp + regi)); +} + +void +fill_fpregset (fpregsetp, regno) + fpregset_t *fpregsetp; + int regno; +{ + int regi; + register long *regp = ALPHA_REGSET_BASE (fpregsetp); + + for (regi = FP0_REGNUM; regi < FP0_REGNUM + 32; regi++) + { + if ((regno == -1) || (regno == regi)) + { + *(regp + regi - FP0_REGNUM) = + *(long *) ®isters[REGISTER_BYTE (regi)]; + } + } +} +#endif + + +/* Register that we are able to handle alpha core file formats. */ + +static struct core_fns alpha_osf_core_fns = +{ + /* This really is bfd_target_unknown_flavour. */ + + bfd_target_unknown_flavour, + fetch_osf_core_registers, + NULL +}; + +static struct core_fns alpha_elf_core_fns = +{ + bfd_target_elf_flavour, + fetch_elf_core_registers, + NULL +}; + +void +_initialize_core_alpha () +{ + add_core_fns (&alpha_osf_core_fns); + add_core_fns (&alpha_elf_core_fns); +} |