350 lines
8.9 KiB
C
350 lines
8.9 KiB
C
/* Target-dependent code for GNU/Linux on MIPS processors.
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Copyright 2001, 2002 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include "defs.h"
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#include "gdbcore.h"
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#include "target.h"
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#include "solib-svr4.h"
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/* Copied from <asm/elf.h>. */
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#define ELF_NGREG 45
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#define ELF_NFPREG 33
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typedef unsigned char elf_greg_t[4];
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typedef elf_greg_t elf_gregset_t[ELF_NGREG];
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typedef unsigned char elf_fpreg_t[8];
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typedef elf_fpreg_t elf_fpregset_t[ELF_NFPREG];
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/* 0 - 31 are integer registers, 32 - 63 are fp registers. */
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#define FPR_BASE 32
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#define PC 64
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#define CAUSE 65
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#define BADVADDR 66
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#define MMHI 67
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#define MMLO 68
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#define FPC_CSR 69
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#define FPC_EIR 70
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#define EF_REG0 6
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#define EF_REG31 37
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#define EF_LO 38
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#define EF_HI 39
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#define EF_CP0_EPC 40
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#define EF_CP0_BADVADDR 41
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#define EF_CP0_STATUS 42
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#define EF_CP0_CAUSE 43
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#define EF_SIZE 180
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/* Figure out where the longjmp will land.
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We expect the first arg to be a pointer to the jmp_buf structure from
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which we extract the pc (MIPS_LINUX_JB_PC) that we will land at. The pc
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is copied into PC. This routine returns 1 on success. */
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int
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mips_linux_get_longjmp_target (CORE_ADDR *pc)
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{
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CORE_ADDR jb_addr;
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char buf[TARGET_PTR_BIT / TARGET_CHAR_BIT];
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jb_addr = read_register (A0_REGNUM);
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if (target_read_memory (jb_addr
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+ MIPS_LINUX_JB_PC * MIPS_LINUX_JB_ELEMENT_SIZE,
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buf, TARGET_PTR_BIT / TARGET_CHAR_BIT))
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return 0;
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*pc = extract_address (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT);
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return 1;
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}
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/* Unpack an elf_gregset_t into GDB's register cache. */
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void
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supply_gregset (elf_gregset_t *gregsetp)
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{
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int regi;
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elf_greg_t *regp = *gregsetp;
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char *zerobuf = alloca (MAX_REGISTER_RAW_SIZE);
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memset (zerobuf, 0, MAX_REGISTER_RAW_SIZE);
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for (regi = EF_REG0; regi <= EF_REG31; regi++)
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supply_register ((regi - EF_REG0), (char *)(regp + regi));
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supply_register (LO_REGNUM, (char *)(regp + EF_LO));
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supply_register (HI_REGNUM, (char *)(regp + EF_HI));
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supply_register (PC_REGNUM, (char *)(regp + EF_CP0_EPC));
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supply_register (BADVADDR_REGNUM, (char *)(regp + EF_CP0_BADVADDR));
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supply_register (PS_REGNUM, (char *)(regp + EF_CP0_STATUS));
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supply_register (CAUSE_REGNUM, (char *)(regp + EF_CP0_CAUSE));
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/* Fill inaccessible registers with zero. */
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supply_register (UNUSED_REGNUM, zerobuf);
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for (regi = FIRST_EMBED_REGNUM; regi < LAST_EMBED_REGNUM; regi++)
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supply_register (regi, zerobuf);
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}
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/* Pack our registers (or one register) into an elf_gregset_t. */
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void
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fill_gregset (elf_gregset_t *gregsetp, int regno)
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{
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int regaddr, regi;
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elf_greg_t *regp = *gregsetp;
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void *src, *dst;
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if (regno == -1)
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{
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memset (regp, 0, sizeof (elf_gregset_t));
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for (regi = 0; regi < 32; regi++)
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fill_gregset (gregsetp, regi);
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fill_gregset (gregsetp, LO_REGNUM);
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fill_gregset (gregsetp, HI_REGNUM);
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fill_gregset (gregsetp, PC_REGNUM);
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fill_gregset (gregsetp, BADVADDR_REGNUM);
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fill_gregset (gregsetp, PS_REGNUM);
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fill_gregset (gregsetp, CAUSE_REGNUM);
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return;
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}
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if (regno < 32)
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{
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src = &deprecated_registers[REGISTER_BYTE (regno)];
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dst = regp + regno + EF_REG0;
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memcpy (dst, src, sizeof (elf_greg_t));
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return;
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}
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regaddr = -1;
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switch (regno)
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{
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case LO_REGNUM:
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regaddr = EF_LO;
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break;
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case HI_REGNUM:
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regaddr = EF_HI;
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break;
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case PC_REGNUM:
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regaddr = EF_CP0_EPC;
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break;
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case BADVADDR_REGNUM:
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regaddr = EF_CP0_BADVADDR;
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break;
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case PS_REGNUM:
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regaddr = EF_CP0_STATUS;
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break;
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case CAUSE_REGNUM:
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regaddr = EF_CP0_CAUSE;
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break;
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}
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if (regaddr != -1)
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{
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src = &deprecated_registers[REGISTER_BYTE (regno)];
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dst = regp + regaddr;
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memcpy (dst, src, sizeof (elf_greg_t));
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}
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}
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/* Likewise, unpack an elf_fpregset_t. */
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void
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supply_fpregset (elf_fpregset_t *fpregsetp)
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{
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register int regi;
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char *zerobuf = alloca (MAX_REGISTER_RAW_SIZE);
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memset (zerobuf, 0, MAX_REGISTER_RAW_SIZE);
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for (regi = 0; regi < 32; regi++)
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supply_register (FP0_REGNUM + regi,
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(char *)(*fpregsetp + regi));
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supply_register (FCRCS_REGNUM, (char *)(*fpregsetp + 32));
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/* FIXME: how can we supply FCRIR_REGNUM? The ABI doesn't tell us. */
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supply_register (FCRIR_REGNUM, zerobuf);
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}
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/* Likewise, pack one or all floating point registers into an
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elf_fpregset_t. */
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void
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fill_fpregset (elf_fpregset_t *fpregsetp, int regno)
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{
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char *from, *to;
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if ((regno >= FP0_REGNUM) && (regno < FP0_REGNUM + 32))
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{
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from = (char *) &deprecated_registers[REGISTER_BYTE (regno)];
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to = (char *) (*fpregsetp + regno - FP0_REGNUM);
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memcpy (to, from, REGISTER_RAW_SIZE (regno - FP0_REGNUM));
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}
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else if (regno == FCRCS_REGNUM)
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{
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from = (char *) &deprecated_registers[REGISTER_BYTE (regno)];
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to = (char *) (*fpregsetp + 32);
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memcpy (to, from, REGISTER_RAW_SIZE (regno));
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}
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else if (regno == -1)
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{
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int regi;
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for (regi = 0; regi < 32; regi++)
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fill_fpregset (fpregsetp, FP0_REGNUM + regi);
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fill_fpregset(fpregsetp, FCRCS_REGNUM);
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}
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}
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/* Map gdb internal register number to ptrace ``address''.
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These ``addresses'' are normally defined in <asm/ptrace.h>. */
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CORE_ADDR
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register_addr (int regno, CORE_ADDR blockend)
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{
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int regaddr;
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if (regno < 0 || regno >= NUM_REGS)
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error ("Bogon register number %d.", regno);
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if (regno < 32)
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regaddr = regno;
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else if ((regno >= FP0_REGNUM) && (regno < FP0_REGNUM + 32))
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regaddr = FPR_BASE + (regno - FP0_REGNUM);
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else if (regno == PC_REGNUM)
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regaddr = PC;
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else if (regno == CAUSE_REGNUM)
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regaddr = CAUSE;
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else if (regno == BADVADDR_REGNUM)
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regaddr = BADVADDR;
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else if (regno == LO_REGNUM)
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regaddr = MMLO;
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else if (regno == HI_REGNUM)
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regaddr = MMHI;
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else if (regno == FCRCS_REGNUM)
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regaddr = FPC_CSR;
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else if (regno == FCRIR_REGNUM)
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regaddr = FPC_EIR;
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else
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error ("Unknowable register number %d.", regno);
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return regaddr;
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}
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/* Use a local version of this function to get the correct types for
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regsets, until multi-arch core support is ready. */
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static void
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fetch_core_registers (char *core_reg_sect, unsigned core_reg_size,
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int which, CORE_ADDR reg_addr)
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{
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elf_gregset_t gregset;
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elf_fpregset_t fpregset;
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if (which == 0)
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{
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if (core_reg_size != sizeof (gregset))
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{
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warning ("wrong size gregset struct in core file");
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}
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else
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{
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memcpy ((char *) &gregset, core_reg_sect, sizeof (gregset));
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supply_gregset (&gregset);
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}
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}
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else if (which == 2)
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{
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if (core_reg_size != sizeof (fpregset))
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{
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warning ("wrong size fpregset struct in core file");
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}
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else
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{
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memcpy ((char *) &fpregset, core_reg_sect, sizeof (fpregset));
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supply_fpregset (&fpregset);
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}
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}
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}
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/* Register that we are able to handle ELF file formats using standard
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procfs "regset" structures. */
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static struct core_fns regset_core_fns =
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{
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bfd_target_elf_flavour, /* core_flavour */
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default_check_format, /* check_format */
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default_core_sniffer, /* core_sniffer */
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fetch_core_registers, /* core_read_registers */
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NULL /* next */
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};
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/* Fetch (and possibly build) an appropriate link_map_offsets
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structure for native GNU/Linux MIPS targets using the struct offsets
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defined in link.h (but without actual reference to that file).
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This makes it possible to access GNU/Linux MIPS shared libraries from a
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GDB that was built on a different host platform (for cross debugging). */
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struct link_map_offsets *
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mips_linux_svr4_fetch_link_map_offsets (void)
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{
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static struct link_map_offsets lmo;
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static struct link_map_offsets *lmp = NULL;
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if (lmp == NULL)
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{
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lmp = &lmo;
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lmo.r_debug_size = 8; /* The actual size is 20 bytes, but
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this is all we need. */
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lmo.r_map_offset = 4;
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lmo.r_map_size = 4;
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lmo.link_map_size = 20;
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lmo.l_addr_offset = 0;
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lmo.l_addr_size = 4;
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lmo.l_name_offset = 4;
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lmo.l_name_size = 4;
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lmo.l_next_offset = 12;
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lmo.l_next_size = 4;
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lmo.l_prev_offset = 16;
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lmo.l_prev_size = 4;
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}
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return lmp;
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}
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void
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_initialize_mips_linux_tdep (void)
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{
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add_core_fns (®set_core_fns);
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}
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