| /* Low level DECstation interface to ptrace, for GDB when running native. |
| Copyright 1988, 1989, 1991, 1992, 1993, 1995, 1996, 1999, 2000, 2001 |
| Free Software Foundation, Inc. |
| Contributed by Alessandro Forin(af@cs.cmu.edu) at CMU |
| and by Per Bothner(bothner@cs.wisc.edu) at U.Wisconsin. |
| |
| 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 <sys/ptrace.h> |
| #include <sys/types.h> |
| #include <sys/param.h> |
| #include <sys/user.h> |
| #undef JB_S0 |
| #undef JB_S1 |
| #undef JB_S2 |
| #undef JB_S3 |
| #undef JB_S4 |
| #undef JB_S5 |
| #undef JB_S6 |
| #undef JB_S7 |
| #undef JB_SP |
| #undef JB_S8 |
| #undef JB_PC |
| #undef JB_SR |
| #undef NJBREGS |
| #include <setjmp.h> /* For JB_XXX. */ |
| |
| /* Size of elements in jmpbuf */ |
| |
| #define JB_ELEMENT_SIZE 4 |
| |
| /* Map gdb internal register number to ptrace ``address''. |
| These ``addresses'' are defined in DECstation <sys/ptrace.h> */ |
| |
| #define REGISTER_PTRACE_ADDR(regno) \ |
| (regno < 32 ? GPR_BASE + regno \ |
| : regno == PC_REGNUM ? PC \ |
| : regno == CAUSE_REGNUM ? CAUSE \ |
| : regno == HI_REGNUM ? MMHI \ |
| : regno == LO_REGNUM ? MMLO \ |
| : regno == FCRCS_REGNUM ? FPC_CSR \ |
| : regno == FCRIR_REGNUM ? FPC_EIR \ |
| : regno >= FP0_REGNUM ? FPR_BASE + (regno - FP0_REGNUM) \ |
| : 0) |
| |
| static void fetch_core_registers (char *, unsigned, int, CORE_ADDR); |
| |
| /* Get all registers from the inferior */ |
| |
| void |
| fetch_inferior_registers (int regno) |
| { |
| register unsigned int regaddr; |
| char *buf = alloca (max_register_size (current_gdbarch)); |
| register int i; |
| char *zerobuf = alloca (max_register_size (current_gdbarch)); |
| memset (zerobuf, 0, max_register_size (current_gdbarch)); |
| |
| deprecated_registers_fetched (); |
| |
| for (regno = 1; regno < NUM_REGS; regno++) |
| { |
| regaddr = REGISTER_PTRACE_ADDR (regno); |
| for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int)) |
| { |
| *(int *) &buf[i] = ptrace (PT_READ_U, PIDGET (inferior_ptid), |
| (PTRACE_ARG3_TYPE) regaddr, 0); |
| regaddr += sizeof (int); |
| } |
| supply_register (regno, buf); |
| } |
| |
| supply_register (ZERO_REGNUM, zerobuf); |
| /* Frame ptr reg must appear to be 0; it is faked by stack handling code. */ |
| supply_register (FP_REGNUM, zerobuf); |
| } |
| |
| /* Store our register values back into the inferior. |
| If REGNO is -1, do this for all registers. |
| Otherwise, REGNO specifies which register (so we can save time). */ |
| |
| void |
| store_inferior_registers (int regno) |
| { |
| register unsigned int regaddr; |
| char buf[80]; |
| |
| if (regno > 0) |
| { |
| if (regno == ZERO_REGNUM || regno == PS_REGNUM |
| || regno == BADVADDR_REGNUM || regno == CAUSE_REGNUM |
| || regno == FCRIR_REGNUM || regno == FP_REGNUM |
| || (regno >= FIRST_EMBED_REGNUM && regno <= LAST_EMBED_REGNUM)) |
| return; |
| regaddr = REGISTER_PTRACE_ADDR (regno); |
| errno = 0; |
| ptrace (PT_WRITE_U, PIDGET (inferior_ptid), (PTRACE_ARG3_TYPE) regaddr, |
| read_register (regno)); |
| if (errno != 0) |
| { |
| sprintf (buf, "writing register number %d", regno); |
| perror_with_name (buf); |
| } |
| } |
| else |
| { |
| for (regno = 0; regno < NUM_REGS; regno++) |
| store_inferior_registers (regno); |
| } |
| } |
| |
| |
| /* 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 (CORE_ADDR *pc) |
| { |
| CORE_ADDR jb_addr; |
| char *buf; |
| |
| buf = alloca (TARGET_PTR_BIT / TARGET_CHAR_BIT); |
| jb_addr = read_register (A0_REGNUM); |
| |
| if (target_read_memory (jb_addr + JB_PC * JB_ELEMENT_SIZE, buf, |
| TARGET_PTR_BIT / TARGET_CHAR_BIT)) |
| return 0; |
| |
| *pc = extract_address (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT); |
| |
| 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_core_registers (char *core_reg_sect, unsigned core_reg_size, int which, |
| CORE_ADDR reg_addr) |
| { |
| register int regno; |
| register unsigned int addr; |
| int bad_reg = -1; |
| register reg_ptr = -reg_addr; /* Original u.u_ar0 is -reg_addr. */ |
| |
| char *zerobuf = alloca (max_register_size (current_gdbarch)); |
| memset (zerobuf, 0, max_register_size (current_gdbarch)); |
| |
| |
| /* If u.u_ar0 was an absolute address in the core file, relativize it now, |
| so we can use it as an offset into core_reg_sect. When we're done, |
| "register 0" will be at core_reg_sect+reg_ptr, and we can use |
| register_addr to offset to the other registers. If this is a modern |
| core file without a upage, reg_ptr will be zero and this is all a big |
| NOP. */ |
| if (reg_ptr > core_reg_size) |
| #ifdef KERNEL_U_ADDR |
| reg_ptr -= KERNEL_U_ADDR; |
| #else |
| error ("Old mips core file can't be processed on this machine."); |
| #endif |
| |
| for (regno = 0; regno < NUM_REGS; regno++) |
| { |
| addr = register_addr (regno, reg_ptr); |
| if (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)); |
| } |
| supply_register (ZERO_REGNUM, zerobuf); |
| /* Frame ptr reg must appear to be 0; it is faked by stack handling code. */ |
| supply_register (FP_REGNUM, zerobuf); |
| } |
| |
| /* Return the address in the core dump or inferior of register REGNO. |
| BLOCKEND is the address of the end of the user structure. */ |
| |
| CORE_ADDR |
| register_addr (int regno, CORE_ADDR blockend) |
| { |
| CORE_ADDR addr; |
| |
| if (regno < 0 || regno >= NUM_REGS) |
| error ("Invalid register number %d.", regno); |
| |
| REGISTER_U_ADDR (addr, blockend, regno); |
| |
| return addr; |
| } |
| |
| |
| /* Register that we are able to handle mips core file formats. |
| FIXME: is this really bfd_target_unknown_flavour? */ |
| |
| static struct core_fns mips_core_fns = |
| { |
| bfd_target_unknown_flavour, /* core_flavour */ |
| default_check_format, /* check_format */ |
| default_core_sniffer, /* core_sniffer */ |
| fetch_core_registers, /* core_read_registers */ |
| NULL /* next */ |
| }; |
| |
| void |
| _initialize_core_mips (void) |
| { |
| add_core_fns (&mips_core_fns); |
| } |