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[/] [or1k/] [trunk/] [gdb-5.3/] [gdb/] [ppc-linux-nat.c] - Rev 1773
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/* PPC GNU/Linux native support. Copyright 1988, 1989, 1991, 1992, 1994, 1996, 2000, 2001, 2002 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 /* Glibc's headers don't define PTRACE_GETVRREGS so we cannot use a configure time check. Some older glibc's (for instance 2.2.1) don't have a specific powerpc version of ptrace.h, and fall back on a generic one. In such cases, sys/ptrace.h defines PTRACE_GETFPXREGS and PTRACE_SETFPXREGS to the same numbers that ppc kernel's asm/ptrace.h defines PTRACE_GETVRREGS and PTRACE_SETVRREGS to be. This also makes a configury check pretty much useless. */ /* These definitions should really come from the glibc header files, but Glibc doesn't know about the vrregs yet. */ #ifndef PTRACE_GETVRREGS #define PTRACE_GETVRREGS 18 #define PTRACE_SETVRREGS 19 #endif /* This oddity is because the Linux kernel defines elf_vrregset_t as an array of 33 16 bytes long elements. I.e. it leaves out vrsave. However the PTRACE_GETVRREGS and PTRACE_SETVRREGS requests return the vrsave as an extra 4 bytes at the end. I opted for creating a flat array of chars, so that it is easier to manipulate for gdb. There are 32 vector registers 16 bytes longs, plus a VSCR register which is only 4 bytes long, but is fetched as a 16 bytes quantity. Up to here we have the elf_vrregset_t structure. Appended to this there is space for the VRSAVE register: 4 bytes. Even though this vrsave register is not included in the regset typedef, it is handled by the ptrace requests. Note that GNU/Linux doesn't support little endian PPC hardware, therefore the offset at which the real value of the VSCR register is located will be always 12 bytes. The layout is like this (where x is the actual value of the vscr reg): */ /* *INDENT-OFF* */ /* |.|.|.|.|.....|.|.|.|.||.|.|.|x||.| <-------> <-------><-------><-> VR0 VR31 VSCR VRSAVE */ /* *INDENT-ON* */ #define SIZEOF_VRREGS 33*16+4 typedef char gdb_vrregset_t[SIZEOF_VRREGS]; /* For runtime check of ptrace support for VRREGS. */ int have_ptrace_getvrregs = 1; 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; if (regno == tdep->ppc_fpscr_regnum) u_addr = PT_FPSCR * 4; return u_addr; } static int ppc_ptrace_cannot_fetch_store_register (int regno) { return (ppc_register_u_addr (regno) == -1); } /* The Linux kernel ptrace interface for AltiVec registers uses the registers set mechanism, as opposed to the interface for all the other registers, that stores/fetches each register individually. */ static void fetch_altivec_register (int tid, int regno) { int ret; int offset = 0; gdb_vrregset_t regs; struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); int vrregsize = REGISTER_RAW_SIZE (tdep->ppc_vr0_regnum); ret = ptrace (PTRACE_GETVRREGS, tid, 0, ®s); if (ret < 0) { if (errno == EIO) { have_ptrace_getvrregs = 0; return; } perror_with_name ("Unable to fetch AltiVec register"); } /* VSCR is fetched as a 16 bytes quantity, but it is really 4 bytes long on the hardware. We deal only with the lower 4 bytes of the vector. VRSAVE is at the end of the array in a 4 bytes slot, so there is no need to define an offset for it. */ if (regno == (tdep->ppc_vrsave_regnum - 1)) offset = vrregsize - REGISTER_RAW_SIZE (tdep->ppc_vrsave_regnum); supply_register (regno, regs + (regno - tdep->ppc_vr0_regnum) * vrregsize + offset); } static void fetch_register (int tid, 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); CORE_ADDR regaddr = ppc_register_u_addr (regno); if (altivec_register_p (regno)) { /* If this is the first time through, or if it is not the first time through, and we have comfirmed that there is kernel support for such a ptrace request, then go and fetch the register. */ if (have_ptrace_getvrregs) { fetch_altivec_register (tid, regno); return; } /* If we have discovered that there is no ptrace support for AltiVec registers, fall through and return zeroes, because regaddr will be -1 in this case. */ } if (regaddr == -1) { memset (buf, '\0', REGISTER_RAW_SIZE (regno)); /* Supply zeroes */ supply_register (regno, buf); return; } 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 supply_vrregset (gdb_vrregset_t *vrregsetp) { int i; struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); int num_of_vrregs = tdep->ppc_vrsave_regnum - tdep->ppc_vr0_regnum + 1; int vrregsize = REGISTER_RAW_SIZE (tdep->ppc_vr0_regnum); int offset = vrregsize - REGISTER_RAW_SIZE (tdep->ppc_vrsave_regnum); for (i = 0; i < num_of_vrregs; i++) { /* The last 2 registers of this set are only 32 bit long, not 128. However an offset is necessary only for VSCR because it occupies a whole vector, while VRSAVE occupies a full 4 bytes slot. */ if (i == (num_of_vrregs - 2)) supply_register (tdep->ppc_vr0_regnum + i, *vrregsetp + i * vrregsize + offset); else supply_register (tdep->ppc_vr0_regnum + i, *vrregsetp + i * vrregsize); } } static void fetch_altivec_registers (int tid) { int ret; gdb_vrregset_t regs; ret = ptrace (PTRACE_GETVRREGS, tid, 0, ®s); if (ret < 0) { if (errno == EIO) { have_ptrace_getvrregs = 0; return; } perror_with_name ("Unable to fetch AltiVec registers"); } supply_vrregset (®s); } static void fetch_ppc_registers (int tid) { int i; struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); for (i = 0; i <= tdep->ppc_fpscr_regnum; i++) fetch_register (tid, i); if (tdep->ppc_mq_regnum != -1) fetch_register (tid, tdep->ppc_mq_regnum); if (have_ptrace_getvrregs) if (tdep->ppc_vr0_regnum != -1 && tdep->ppc_vrsave_regnum != -1) fetch_altivec_registers (tid); } /* 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) { /* Overload thread id onto process id */ int tid = TIDGET (inferior_ptid); /* No thread id, just use process id */ if (tid == 0) tid = PIDGET (inferior_ptid); if (regno == -1) fetch_ppc_registers (tid); else fetch_register (tid, regno); } /* Store one register. */ static void store_altivec_register (int tid, int regno) { int ret; int offset = 0; gdb_vrregset_t regs; struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); int vrregsize = REGISTER_RAW_SIZE (tdep->ppc_vr0_regnum); ret = ptrace (PTRACE_GETVRREGS, tid, 0, ®s); if (ret < 0) { if (errno == EIO) { have_ptrace_getvrregs = 0; return; } perror_with_name ("Unable to fetch AltiVec register"); } /* VSCR is fetched as a 16 bytes quantity, but it is really 4 bytes long on the hardware. */ if (regno == (tdep->ppc_vrsave_regnum - 1)) offset = vrregsize - REGISTER_RAW_SIZE (tdep->ppc_vrsave_regnum); regcache_collect (regno, regs + (regno - tdep->ppc_vr0_regnum) * vrregsize + offset); ret = ptrace (PTRACE_SETVRREGS, tid, 0, ®s); if (ret < 0) perror_with_name ("Unable to store AltiVec register"); } static void store_register (int tid, 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. */ char *buf = alloca (MAX_REGISTER_RAW_SIZE); if (altivec_register_p (regno)) { store_altivec_register (tid, regno); return; } if (regaddr == -1) return; 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 == EIO && regno == gdbarch_tdep (current_gdbarch)->ppc_fpscr_regnum) { /* Some older kernel versions don't allow fpscr to be written. */ continue; } if (errno != 0) { sprintf (mess, "writing register %s (#%d)", REGISTER_NAME (regno), regno); perror_with_name (mess); } } } static void fill_vrregset (gdb_vrregset_t *vrregsetp) { int i; struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); int num_of_vrregs = tdep->ppc_vrsave_regnum - tdep->ppc_vr0_regnum + 1; int vrregsize = REGISTER_RAW_SIZE (tdep->ppc_vr0_regnum); int offset = vrregsize - REGISTER_RAW_SIZE (tdep->ppc_vrsave_regnum); for (i = 0; i < num_of_vrregs; i++) { /* The last 2 registers of this set are only 32 bit long, not 128, but only VSCR is fetched as a 16 bytes quantity. */ if (i == (num_of_vrregs - 2)) regcache_collect (tdep->ppc_vr0_regnum + i, *vrregsetp + i * vrregsize + offset); else regcache_collect (tdep->ppc_vr0_regnum + i, *vrregsetp + i * vrregsize); } } static void store_altivec_registers (int tid) { int ret; gdb_vrregset_t regs; ret = ptrace (PTRACE_GETVRREGS, tid, 0, (int) ®s); if (ret < 0) { if (errno == EIO) { have_ptrace_getvrregs = 0; return; } perror_with_name ("Couldn't get AltiVec registers"); } fill_vrregset (®s); if (ptrace (PTRACE_SETVRREGS, tid, 0, (int) ®s) < 0) perror_with_name ("Couldn't write AltiVec registers"); } static void store_ppc_registers (int tid) { int i; struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); for (i = 0; i <= tdep->ppc_fpscr_regnum; i++) store_register (tid, i); if (tdep->ppc_mq_regnum != -1) store_register (tid, tdep->ppc_mq_regnum); if (have_ptrace_getvrregs) if (tdep->ppc_vr0_regnum != -1 && tdep->ppc_vrsave_regnum != -1) store_altivec_registers (tid); } void store_inferior_registers (int regno) { /* Overload thread id onto process id */ int tid = TIDGET (inferior_ptid); /* No thread id, just use process id */ if (tid == 0) tid = PIDGET (inferior_ptid); if (regno >= 0) store_register (tid, regno); else store_ppc_registers (tid); } void supply_gregset (gdb_gregset_t *gregsetp) { ppc_linux_supply_gregset ((char *) gregsetp); } 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) && (tdep->ppc_mq_regnum != -1)) 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) { ppc_linux_supply_fpregset ((char *) fpregsetp); } /* 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; struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); for (regi = 0; regi < 32; regi++) { if ((regno == -1) || (regno == FP0_REGNUM + regi)) regcache_collect (FP0_REGNUM + regi, (char *) (*fpregsetp + regi)); } if ((regno == -1) || regno == tdep->ppc_fpscr_regnum) regcache_collect (tdep->ppc_fpscr_regnum, (char *) (*fpregsetp + regi)); }
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