/* PPC linux native support. Copyright 1988, 1989, 1991, 1992, 1994, 1996, 2000, 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 "frame.h" #include "inferior.h" #include "gdbcore.h" #include "regcache.h" #include <sys/types.h> #include <sys/param.h> #include <signal.h> #include <sys/user.h> #include <sys/ioctl.h> #include <sys/wait.h> #include <fcntl.h> #include <sys/procfs.h> #include <sys/ptrace.h> /* Prototypes for supply_gregset etc. */ #include "gregset.h" #include "ppc-tdep.h" #ifndef PT_READ_U #define PT_READ_U PTRACE_PEEKUSR #endif #ifndef PT_WRITE_U #define PT_WRITE_U PTRACE_POKEUSR #endif /* Default the type of the ptrace transfer to int. */ #ifndef PTRACE_XFER_TYPE #define PTRACE_XFER_TYPE int #endif int kernel_u_size (void) { return (sizeof (struct user)); } /* *INDENT-OFF* */ /* registers layout, as presented by the ptrace interface: PT_R0, PT_R1, PT_R2, PT_R3, PT_R4, PT_R5, PT_R6, PT_R7, PT_R8, PT_R9, PT_R10, PT_R11, PT_R12, PT_R13, PT_R14, PT_R15, PT_R16, PT_R17, PT_R18, PT_R19, PT_R20, PT_R21, PT_R22, PT_R23, PT_R24, PT_R25, PT_R26, PT_R27, PT_R28, PT_R29, PT_R30, PT_R31, PT_FPR0, PT_FPR0 + 2, PT_FPR0 + 4, PT_FPR0 + 6, PT_FPR0 + 8, PT_FPR0 + 10, PT_FPR0 + 12, PT_FPR0 + 14, PT_FPR0 + 16, PT_FPR0 + 18, PT_FPR0 + 20, PT_FPR0 + 22, PT_FPR0 + 24, PT_FPR0 + 26, PT_FPR0 + 28, PT_FPR0 + 30, PT_FPR0 + 32, PT_FPR0 + 34, PT_FPR0 + 36, PT_FPR0 + 38, PT_FPR0 + 40, PT_FPR0 + 42, PT_FPR0 + 44, PT_FPR0 + 46, PT_FPR0 + 48, PT_FPR0 + 50, PT_FPR0 + 52, PT_FPR0 + 54, PT_FPR0 + 56, PT_FPR0 + 58, PT_FPR0 + 60, PT_FPR0 + 62, PT_NIP, PT_MSR, PT_CCR, PT_LNK, PT_CTR, PT_XER, PT_MQ */ /* *INDENT_ON * */ static int ppc_register_u_addr (int regno) { int u_addr = -1; struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); /* General purpose registers occupy 1 slot each in the buffer */ if (regno >= tdep->ppc_gp0_regnum && regno <= tdep->ppc_gplast_regnum ) u_addr = ((PT_R0 + regno) * 4); /* Floating point regs: 2 slots each */ if (regno >= FP0_REGNUM && regno <= FPLAST_REGNUM) u_addr = ((PT_FPR0 + (regno - FP0_REGNUM) * 2) * 4); /* UISA special purpose registers: 1 slot each */ if (regno == PC_REGNUM) u_addr = PT_NIP * 4; if (regno == tdep->ppc_lr_regnum) u_addr = PT_LNK * 4; if (regno == tdep->ppc_cr_regnum) u_addr = PT_CCR * 4; if (regno == tdep->ppc_xer_regnum) u_addr = PT_XER * 4; if (regno == tdep->ppc_ctr_regnum) u_addr = PT_CTR * 4; if (regno == tdep->ppc_mq_regnum) u_addr = PT_MQ * 4; if (regno == tdep->ppc_ps_regnum) u_addr = PT_MSR * 4; return u_addr; } static int ppc_ptrace_cannot_fetch_store_register (int regno) { return (ppc_register_u_addr (regno) == -1); } static void fetch_register (int regno) { /* This isn't really an address. But ptrace thinks of it as one. */ char mess[128]; /* For messages */ register int i; unsigned int offset; /* Offset of registers within the u area. */ char *buf = alloca (MAX_REGISTER_RAW_SIZE); int tid; CORE_ADDR regaddr = ppc_register_u_addr (regno); if (regaddr == -1) { memset (buf, '\0', REGISTER_RAW_SIZE (regno)); /* Supply zeroes */ supply_register (regno, buf); return; } /* Overload thread id onto process id */ if ((tid = TIDGET (inferior_ptid)) == 0) tid = PIDGET (inferior_ptid); /* no thread id, just use process id */ for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (PTRACE_XFER_TYPE)) { errno = 0; *(PTRACE_XFER_TYPE *) & buf[i] = ptrace (PT_READ_U, tid, (PTRACE_ARG3_TYPE) regaddr, 0); regaddr += sizeof (PTRACE_XFER_TYPE); if (errno != 0) { sprintf (mess, "reading register %s (#%d)", REGISTER_NAME (regno), regno); perror_with_name (mess); } } supply_register (regno, buf); } static void fetch_ppc_registers (void) { int i; int last_register = gdbarch_tdep (current_gdbarch)->ppc_mq_regnum; for (i = 0; i <= last_register; i++) fetch_register (i); } /* Fetch registers from the child process. Fetch all registers if regno == -1, otherwise fetch all general registers or all floating point registers depending upon the value of regno. */ void fetch_inferior_registers (int regno) { if (regno == -1) fetch_ppc_registers (); else fetch_register (regno); } /* Store one register. */ static void store_register (int regno) { /* This isn't really an address. But ptrace thinks of it as one. */ CORE_ADDR regaddr = ppc_register_u_addr (regno); char mess[128]; /* For messages */ register int i; unsigned int offset; /* Offset of registers within the u area. */ int tid; char *buf = alloca (MAX_REGISTER_RAW_SIZE); if (regaddr == -1) { return; } /* Overload thread id onto process id */ if ((tid = TIDGET (inferior_ptid)) == 0) tid = PIDGET (inferior_ptid); /* no thread id, just use process id */ regcache_collect (regno, buf); for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (PTRACE_XFER_TYPE)) { errno = 0; ptrace (PT_WRITE_U, tid, (PTRACE_ARG3_TYPE) regaddr, *(PTRACE_XFER_TYPE *) & buf[i]); regaddr += sizeof (PTRACE_XFER_TYPE); if (errno != 0) { sprintf (mess, "writing register %s (#%d)", REGISTER_NAME (regno), regno); perror_with_name (mess); } } } static void store_ppc_registers (void) { int i; int last_register = gdbarch_tdep (current_gdbarch)->ppc_mq_regnum; for (i = 0; i <= last_register; i++) store_register (i); } void store_inferior_registers (int regno) { if (regno >= 0) store_register (regno); else store_ppc_registers (); } void supply_gregset (gdb_gregset_t *gregsetp) { int regi; register elf_greg_t *regp = (elf_greg_t *) gregsetp; struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); for (regi = 0; regi < 32; regi++) supply_register (regi, (char *) (regp + regi)); supply_register (PC_REGNUM, (char *) (regp + PT_NIP)); supply_register (tdep->ppc_lr_regnum, (char *) (regp + PT_LNK)); supply_register (tdep->ppc_cr_regnum, (char *) (regp + PT_CCR)); supply_register (tdep->ppc_xer_regnum, (char *) (regp + PT_XER)); supply_register (tdep->ppc_ctr_regnum, (char *) (regp + PT_CTR)); supply_register (tdep->ppc_mq_regnum, (char *) (regp + PT_MQ)); supply_register (tdep->ppc_ps_regnum, (char *) (regp + PT_MSR)); } void fill_gregset (gdb_gregset_t *gregsetp, int regno) { int regi; elf_greg_t *regp = (elf_greg_t *) gregsetp; struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); for (regi = 0; regi < 32; regi++) { if ((regno == -1) || regno == regi) regcache_collect (regi, regp + PT_R0 + regi); } if ((regno == -1) || regno == PC_REGNUM) regcache_collect (PC_REGNUM, regp + PT_NIP); if ((regno == -1) || regno == tdep->ppc_lr_regnum) regcache_collect (tdep->ppc_lr_regnum, regp + PT_LNK); if ((regno == -1) || regno == tdep->ppc_cr_regnum) regcache_collect (tdep->ppc_cr_regnum, regp + PT_CCR); if ((regno == -1) || regno == tdep->ppc_xer_regnum) regcache_collect (tdep->ppc_xer_regnum, regp + PT_XER); if ((regno == -1) || regno == tdep->ppc_ctr_regnum) regcache_collect (tdep->ppc_ctr_regnum, regp + PT_CTR); if ((regno == -1) || regno == tdep->ppc_mq_regnum) regcache_collect (tdep->ppc_mq_regnum, regp + PT_MQ); if ((regno == -1) || regno == tdep->ppc_ps_regnum) regcache_collect (tdep->ppc_ps_regnum, regp + PT_MSR); } void supply_fpregset (gdb_fpregset_t * fpregsetp) { int regi; for (regi = 0; regi < 32; regi++) { supply_register (FP0_REGNUM + regi, (char *) (*fpregsetp + regi)); } } /* Given a pointer to a floating point register set in /proc format (fpregset_t *), update the register specified by REGNO from gdb's idea of the current floating point register set. If REGNO is -1, update them all. */ void fill_fpregset (gdb_fpregset_t *fpregsetp, int regno) { int regi; for (regi = 0; regi < 32; regi++) { if ((regno == -1) || (regno == FP0_REGNUM + regi)) regcache_collect (FP0_REGNUM + regi, (char *) (*fpregsetp + regi)); } }