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Diffstat (limited to 'gdb/mips-nat.c')
| -rw-r--r-- | gdb/mips-nat.c | 244 |
1 files changed, 244 insertions, 0 deletions
diff --git a/gdb/mips-nat.c b/gdb/mips-nat.c new file mode 100644 index 00000000000..9f5717475e1 --- /dev/null +++ b/gdb/mips-nat.c @@ -0,0 +1,244 @@ +/* Low level DECstation interface to ptrace, for GDB when running native. + Copyright 1988, 1989, 1991, 1992, 1995 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 <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 char zerobuf[MAX_REGISTER_RAW_SIZE] = {0}; + +static void fetch_core_registers PARAMS ((char *, unsigned, int, CORE_ADDR)); + +/* Get all registers from the inferior */ + +void +fetch_inferior_registers (regno) + int regno; +{ + register unsigned int regaddr; + char buf[MAX_REGISTER_RAW_SIZE]; + register int i; + + 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, inferior_pid, + (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 (regno) + 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, inferior_pid, (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(pc) + CORE_ADDR *pc; +{ + CORE_ADDR jb_addr; + char buf[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 (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 unsigned int addr; + int bad_reg = -1; + register reg_ptr = -reg_addr; /* Original u.u_ar0 is -reg_addr. */ + + /* 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 (regno, blockend) + 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, + fetch_core_registers, + NULL +}; + +void +_initialize_core_mips () +{ + add_core_fns (&mips_core_fns); +} |