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-rw-r--r--gdb/mips-linux-tdep.c344
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diff --git a/gdb/mips-linux-tdep.c b/gdb/mips-linux-tdep.c
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--- a/gdb/mips-linux-tdep.c
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-/* Target-dependent code for Linux/MIPS.
- Copyright 2001 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 "gdbcore.h"
-#include "target.h"
-#include "solib-svr4.h"
-
-/* Copied from <asm/elf.h>. */
-#define ELF_NGREG 45
-#define ELF_NFPREG 33
-
-typedef unsigned char elf_greg_t[4];
-typedef elf_greg_t elf_gregset_t[ELF_NGREG];
-
-typedef unsigned char elf_fpreg_t[8];
-typedef elf_fpreg_t elf_fpregset_t[ELF_NFPREG];
-
-/* 0 - 31 are integer registers, 32 - 63 are fp registers. */
-#define FPR_BASE 32
-#define PC 64
-#define CAUSE 65
-#define BADVADDR 66
-#define MMHI 67
-#define MMLO 68
-#define FPC_CSR 69
-#define FPC_EIR 70
-
-#define EF_REG0 6
-#define EF_REG31 37
-#define EF_LO 38
-#define EF_HI 39
-#define EF_CP0_EPC 40
-#define EF_CP0_BADVADDR 41
-#define EF_CP0_STATUS 42
-#define EF_CP0_CAUSE 43
-
-#define EF_SIZE 180
-
-/* 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 1 on success. */
-
-int
-mips_linux_get_longjmp_target (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;
-}
-
-/* Unpack an elf_gregset_t into GDB's register cache. */
-
-void
-supply_gregset (elf_gregset_t *gregsetp)
-{
- int regi;
- elf_greg_t *regp = *gregsetp;
- static char zerobuf[MAX_REGISTER_RAW_SIZE] = {0};
-
- for (regi = EF_REG0; regi <= EF_REG31; regi++)
- supply_register ((regi - EF_REG0), (char *)(regp + regi));
-
- supply_register (LO_REGNUM, (char *)(regp + EF_LO));
- supply_register (HI_REGNUM, (char *)(regp + EF_HI));
-
- supply_register (PC_REGNUM, (char *)(regp + EF_CP0_EPC));
- supply_register (BADVADDR_REGNUM, (char *)(regp + EF_CP0_BADVADDR));
- supply_register (PS_REGNUM, (char *)(regp + EF_CP0_STATUS));
- supply_register (CAUSE_REGNUM, (char *)(regp + EF_CP0_CAUSE));
-
- /* Fill inaccessible registers with zero. */
- supply_register (FP_REGNUM, zerobuf);
- supply_register (UNUSED_REGNUM, zerobuf);
- for (regi = FIRST_EMBED_REGNUM; regi < LAST_EMBED_REGNUM; regi++)
- supply_register (regi, zerobuf);
-}
-
-/* Pack our registers (or one register) into an elf_gregset_t. */
-
-void
-fill_gregset (elf_gregset_t *gregsetp, int regno)
-{
- int regaddr, regi;
- elf_greg_t *regp = *gregsetp;
- void *src, *dst;
-
- if (regno == -1)
- {
- memset (regp, 0, sizeof (elf_gregset_t));
- for (regi = 0; regi < 32; regi++)
- fill_gregset (gregsetp, regi);
- fill_gregset (gregsetp, LO_REGNUM);
- fill_gregset (gregsetp, HI_REGNUM);
- fill_gregset (gregsetp, PC_REGNUM);
- fill_gregset (gregsetp, BADVADDR_REGNUM);
- fill_gregset (gregsetp, PS_REGNUM);
- fill_gregset (gregsetp, CAUSE_REGNUM);
-
- return;
- }
-
- if (regno < 32)
- {
- src = &registers[REGISTER_BYTE (regno)];
- dst = regp + regno + EF_REG0;
- memcpy (dst, src, sizeof (elf_greg_t));
- return;
- }
-
- regaddr = -1;
- switch (regno)
- {
- case LO_REGNUM:
- regaddr = EF_LO;
- break;
- case HI_REGNUM:
- regaddr = EF_HI;
- break;
- case PC_REGNUM:
- regaddr = EF_CP0_EPC;
- break;
- case BADVADDR_REGNUM:
- regaddr = EF_CP0_BADVADDR;
- break;
- case PS_REGNUM:
- regaddr = EF_CP0_STATUS;
- break;
- case CAUSE_REGNUM:
- regaddr = EF_CP0_CAUSE;
- break;
- }
-
- if (regaddr != -1)
- {
- src = &registers[REGISTER_BYTE (regno)];
- dst = regp + regaddr;
- memcpy (dst, src, sizeof (elf_greg_t));
- }
-}
-
-/* Likewise, unpack an elf_fpregset_t. */
-
-void
-supply_fpregset (elf_fpregset_t *fpregsetp)
-{
- register int regi;
- static char zerobuf[MAX_REGISTER_RAW_SIZE] = {0};
-
- for (regi = 0; regi < 32; regi++)
- supply_register (FP0_REGNUM + regi,
- (char *)(*fpregsetp + regi));
-
- supply_register (FCRCS_REGNUM, (char *)(*fpregsetp + 32));
-
- /* FIXME: how can we supply FCRIR_REGNUM? The ABI doesn't tell us. */
- supply_register (FCRIR_REGNUM, zerobuf);
-}
-
-/* Likewise, pack one or all floating point registers into an
- elf_fpregset_t. */
-
-void
-fill_fpregset (elf_fpregset_t *fpregsetp, int regno)
-{
- char *from, *to;
-
- if ((regno >= FP0_REGNUM) && (regno < FP0_REGNUM + 32))
- {
- from = (char *) &registers[REGISTER_BYTE (regno)];
- to = (char *) (*fpregsetp + regno - FP0_REGNUM);
- memcpy (to, from, REGISTER_RAW_SIZE (regno - FP0_REGNUM));
- }
- else if (regno == FCRCS_REGNUM)
- {
- from = (char *) &registers[REGISTER_BYTE (regno)];
- to = (char *) (*fpregsetp + 32);
- memcpy (to, from, REGISTER_RAW_SIZE (regno));
- }
- else if (regno == -1)
- {
- int regi;
-
- for (regi = 0; regi < 32; regi++)
- fill_fpregset (fpregsetp, FP0_REGNUM + regi);
- fill_fpregset(fpregsetp, FCRCS_REGNUM);
- }
-}
-
-/* Map gdb internal register number to ptrace ``address''.
- These ``addresses'' are normally defined in <asm/ptrace.h>. */
-
-CORE_ADDR
-register_addr (int regno, CORE_ADDR blockend)
-{
- int regaddr;
-
- if (regno < 0 || regno >= NUM_REGS)
- error ("Bogon register number %d.", regno);
-
- if (regno < 32)
- regaddr = regno;
- else if ((regno >= FP0_REGNUM) && (regno < FP0_REGNUM + 32))
- regaddr = FPR_BASE + (regno - FP0_REGNUM);
- else if (regno == PC_REGNUM)
- regaddr = PC;
- else if (regno == CAUSE_REGNUM)
- regaddr = CAUSE;
- else if (regno == BADVADDR_REGNUM)
- regaddr = BADVADDR;
- else if (regno == LO_REGNUM)
- regaddr = MMLO;
- else if (regno == HI_REGNUM)
- regaddr = MMHI;
- else if (regno == FCRCS_REGNUM)
- regaddr = FPC_CSR;
- else if (regno == FCRIR_REGNUM)
- regaddr = FPC_EIR;
- else
- error ("Unknowable register number %d.", regno);
-
- return regaddr;
-}
-
-/* Use a local version of this function to get the correct types for
- regsets, until multi-arch core support is ready. */
-
-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;
-
- if (which == 0)
- {
- if (core_reg_size != sizeof (gregset))
- {
- warning ("wrong size gregset struct in core file");
- }
- else
- {
- memcpy ((char *) &gregset, core_reg_sect, sizeof (gregset));
- supply_gregset (&gregset);
- }
- }
- else if (which == 2)
- {
- if (core_reg_size != sizeof (fpregset))
- {
- warning ("wrong size fpregset struct in core file");
- }
- else
- {
- memcpy ((char *) &fpregset, core_reg_sect, sizeof (fpregset));
- supply_fpregset (&fpregset);
- }
- }
-}
-
-/* Register that we are able to handle ELF file formats using standard
- procfs "regset" structures. */
-
-static struct core_fns regset_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 */
-};
-
-/* Fetch (and possibly build) an appropriate link_map_offsets
- structure for native Linux/MIPS targets using the struct offsets
- defined in link.h (but without actual reference to that file).
-
- This makes it possible to access Linux/MIPS shared libraries from a
- GDB that was not built on an Linux/MIPS host (for cross debugging). */
-
-struct link_map_offsets *
-mips_linux_svr4_fetch_link_map_offsets (void)
-{
- static struct link_map_offsets lmo;
- static struct link_map_offsets *lmp = NULL;
-
- if (lmp == NULL)
- {
- lmp = &lmo;
-
- lmo.r_debug_size = 8; /* The actual size is 20 bytes, but
- this is all we need. */
- lmo.r_map_offset = 4;
- lmo.r_map_size = 4;
-
- lmo.link_map_size = 20;
-
- lmo.l_addr_offset = 0;
- lmo.l_addr_size = 4;
-
- lmo.l_name_offset = 4;
- lmo.l_name_size = 4;
-
- lmo.l_next_offset = 12;
- lmo.l_next_size = 4;
-
- lmo.l_prev_offset = 16;
- lmo.l_prev_size = 4;
- }
-
- return lmp;
-}
-
-void
-_initialize_mips_linux_tdep (void)
-{
- add_core_fns (&regset_core_fns);
-}
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