| /* GNU/Linux on ARM native support. |
| Copyright (C) 1999, 2000, 2001, 2002, 2004, 2005, 2006, 2007, 2008 |
| 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 3 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, see <http://www.gnu.org/licenses/>. */ |
| |
| #include "defs.h" |
| #include "inferior.h" |
| #include "gdbcore.h" |
| #include "gdb_string.h" |
| #include "regcache.h" |
| #include "target.h" |
| #include "linux-nat.h" |
| #include "target-descriptions.h" |
| |
| #include "arm-tdep.h" |
| #include "arm-linux-tdep.h" |
| |
| #include <sys/user.h> |
| #include <sys/ptrace.h> |
| #include <sys/utsname.h> |
| #include <sys/procfs.h> |
| |
| /* Prototypes for supply_gregset etc. */ |
| #include "gregset.h" |
| |
| /* Defines ps_err_e, struct ps_prochandle. */ |
| #include "gdb_proc_service.h" |
| |
| #include "features/arm-with-iwmmxt.c" |
| |
| #ifndef PTRACE_GET_THREAD_AREA |
| #define PTRACE_GET_THREAD_AREA 22 |
| #endif |
| |
| #ifndef PTRACE_GETWMMXREGS |
| #define PTRACE_GETWMMXREGS 18 |
| #define PTRACE_SETWMMXREGS 19 |
| #endif |
| |
| /* A flag for whether the WMMX registers are available. */ |
| static int arm_linux_has_wmmx_registers; |
| |
| extern int arm_apcs_32; |
| |
| /* The following variables are used to determine the version of the |
| underlying GNU/Linux operating system. Examples: |
| |
| GNU/Linux 2.0.35 GNU/Linux 2.2.12 |
| os_version = 0x00020023 os_version = 0x0002020c |
| os_major = 2 os_major = 2 |
| os_minor = 0 os_minor = 2 |
| os_release = 35 os_release = 12 |
| |
| Note: os_version = (os_major << 16) | (os_minor << 8) | os_release |
| |
| These are initialized using get_linux_version() from |
| _initialize_arm_linux_nat(). */ |
| |
| static unsigned int os_version, os_major, os_minor, os_release; |
| |
| /* On GNU/Linux, threads are implemented as pseudo-processes, in which |
| case we may be tracing more than one process at a time. In that |
| case, inferior_ptid will contain the main process ID and the |
| individual thread (process) ID. get_thread_id () is used to get |
| the thread id if it's available, and the process id otherwise. */ |
| |
| int |
| get_thread_id (ptid_t ptid) |
| { |
| int tid = TIDGET (ptid); |
| if (0 == tid) |
| tid = PIDGET (ptid); |
| return tid; |
| } |
| #define GET_THREAD_ID(PTID) get_thread_id (PTID) |
| |
| /* Get the value of a particular register from the floating point |
| state of the process and store it into regcache. */ |
| |
| static void |
| fetch_fpregister (struct regcache *regcache, int regno) |
| { |
| int ret, tid; |
| gdb_byte fp[ARM_LINUX_SIZEOF_NWFPE]; |
| |
| /* Get the thread id for the ptrace call. */ |
| tid = GET_THREAD_ID (inferior_ptid); |
| |
| /* Read the floating point state. */ |
| ret = ptrace (PT_GETFPREGS, tid, 0, fp); |
| if (ret < 0) |
| { |
| warning (_("Unable to fetch floating point register.")); |
| return; |
| } |
| |
| /* Fetch fpsr. */ |
| if (ARM_FPS_REGNUM == regno) |
| regcache_raw_supply (regcache, ARM_FPS_REGNUM, |
| fp + NWFPE_FPSR_OFFSET); |
| |
| /* Fetch the floating point register. */ |
| if (regno >= ARM_F0_REGNUM && regno <= ARM_F7_REGNUM) |
| supply_nwfpe_register (regcache, regno, fp); |
| } |
| |
| /* Get the whole floating point state of the process and store it |
| into regcache. */ |
| |
| static void |
| fetch_fpregs (struct regcache *regcache) |
| { |
| int ret, regno, tid; |
| gdb_byte fp[ARM_LINUX_SIZEOF_NWFPE]; |
| |
| /* Get the thread id for the ptrace call. */ |
| tid = GET_THREAD_ID (inferior_ptid); |
| |
| /* Read the floating point state. */ |
| ret = ptrace (PT_GETFPREGS, tid, 0, fp); |
| if (ret < 0) |
| { |
| warning (_("Unable to fetch the floating point registers.")); |
| return; |
| } |
| |
| /* Fetch fpsr. */ |
| regcache_raw_supply (regcache, ARM_FPS_REGNUM, |
| fp + NWFPE_FPSR_OFFSET); |
| |
| /* Fetch the floating point registers. */ |
| for (regno = ARM_F0_REGNUM; regno <= ARM_F7_REGNUM; regno++) |
| supply_nwfpe_register (regcache, regno, fp); |
| } |
| |
| /* Save a particular register into the floating point state of the |
| process using the contents from regcache. */ |
| |
| static void |
| store_fpregister (const struct regcache *regcache, int regno) |
| { |
| int ret, tid; |
| gdb_byte fp[ARM_LINUX_SIZEOF_NWFPE]; |
| |
| /* Get the thread id for the ptrace call. */ |
| tid = GET_THREAD_ID (inferior_ptid); |
| |
| /* Read the floating point state. */ |
| ret = ptrace (PT_GETFPREGS, tid, 0, fp); |
| if (ret < 0) |
| { |
| warning (_("Unable to fetch the floating point registers.")); |
| return; |
| } |
| |
| /* Store fpsr. */ |
| if (ARM_FPS_REGNUM == regno && regcache_valid_p (regcache, ARM_FPS_REGNUM)) |
| regcache_raw_collect (regcache, ARM_FPS_REGNUM, fp + NWFPE_FPSR_OFFSET); |
| |
| /* Store the floating point register. */ |
| if (regno >= ARM_F0_REGNUM && regno <= ARM_F7_REGNUM) |
| collect_nwfpe_register (regcache, regno, fp); |
| |
| ret = ptrace (PTRACE_SETFPREGS, tid, 0, fp); |
| if (ret < 0) |
| { |
| warning (_("Unable to store floating point register.")); |
| return; |
| } |
| } |
| |
| /* Save the whole floating point state of the process using |
| the contents from regcache. */ |
| |
| static void |
| store_fpregs (const struct regcache *regcache) |
| { |
| int ret, regno, tid; |
| gdb_byte fp[ARM_LINUX_SIZEOF_NWFPE]; |
| |
| /* Get the thread id for the ptrace call. */ |
| tid = GET_THREAD_ID (inferior_ptid); |
| |
| /* Read the floating point state. */ |
| ret = ptrace (PT_GETFPREGS, tid, 0, fp); |
| if (ret < 0) |
| { |
| warning (_("Unable to fetch the floating point registers.")); |
| return; |
| } |
| |
| /* Store fpsr. */ |
| if (regcache_valid_p (regcache, ARM_FPS_REGNUM)) |
| regcache_raw_collect (regcache, ARM_FPS_REGNUM, fp + NWFPE_FPSR_OFFSET); |
| |
| /* Store the floating point registers. */ |
| for (regno = ARM_F0_REGNUM; regno <= ARM_F7_REGNUM; regno++) |
| if (regcache_valid_p (regcache, regno)) |
| collect_nwfpe_register (regcache, regno, fp); |
| |
| ret = ptrace (PTRACE_SETFPREGS, tid, 0, fp); |
| if (ret < 0) |
| { |
| warning (_("Unable to store floating point registers.")); |
| return; |
| } |
| } |
| |
| /* Fetch a general register of the process and store into |
| regcache. */ |
| |
| static void |
| fetch_register (struct regcache *regcache, int regno) |
| { |
| int ret, tid; |
| elf_gregset_t regs; |
| |
| /* Get the thread id for the ptrace call. */ |
| tid = GET_THREAD_ID (inferior_ptid); |
| |
| ret = ptrace (PTRACE_GETREGS, tid, 0, ®s); |
| if (ret < 0) |
| { |
| warning (_("Unable to fetch general register.")); |
| return; |
| } |
| |
| if (regno >= ARM_A1_REGNUM && regno < ARM_PC_REGNUM) |
| regcache_raw_supply (regcache, regno, (char *) ®s[regno]); |
| |
| if (ARM_PS_REGNUM == regno) |
| { |
| if (arm_apcs_32) |
| regcache_raw_supply (regcache, ARM_PS_REGNUM, |
| (char *) ®s[ARM_CPSR_REGNUM]); |
| else |
| regcache_raw_supply (regcache, ARM_PS_REGNUM, |
| (char *) ®s[ARM_PC_REGNUM]); |
| } |
| |
| if (ARM_PC_REGNUM == regno) |
| { |
| regs[ARM_PC_REGNUM] = gdbarch_addr_bits_remove |
| (get_regcache_arch (regcache), |
| regs[ARM_PC_REGNUM]); |
| regcache_raw_supply (regcache, ARM_PC_REGNUM, |
| (char *) ®s[ARM_PC_REGNUM]); |
| } |
| } |
| |
| /* Fetch all general registers of the process and store into |
| regcache. */ |
| |
| static void |
| fetch_regs (struct regcache *regcache) |
| { |
| int ret, regno, tid; |
| elf_gregset_t regs; |
| |
| /* Get the thread id for the ptrace call. */ |
| tid = GET_THREAD_ID (inferior_ptid); |
| |
| ret = ptrace (PTRACE_GETREGS, tid, 0, ®s); |
| if (ret < 0) |
| { |
| warning (_("Unable to fetch general registers.")); |
| return; |
| } |
| |
| for (regno = ARM_A1_REGNUM; regno < ARM_PC_REGNUM; regno++) |
| regcache_raw_supply (regcache, regno, (char *) ®s[regno]); |
| |
| if (arm_apcs_32) |
| regcache_raw_supply (regcache, ARM_PS_REGNUM, |
| (char *) ®s[ARM_CPSR_REGNUM]); |
| else |
| regcache_raw_supply (regcache, ARM_PS_REGNUM, |
| (char *) ®s[ARM_PC_REGNUM]); |
| |
| regs[ARM_PC_REGNUM] = gdbarch_addr_bits_remove |
| (get_regcache_arch (regcache), regs[ARM_PC_REGNUM]); |
| regcache_raw_supply (regcache, ARM_PC_REGNUM, |
| (char *) ®s[ARM_PC_REGNUM]); |
| } |
| |
| /* Store all general registers of the process from the values in |
| regcache. */ |
| |
| static void |
| store_register (const struct regcache *regcache, int regno) |
| { |
| int ret, tid; |
| elf_gregset_t regs; |
| |
| if (!regcache_valid_p (regcache, regno)) |
| return; |
| |
| /* Get the thread id for the ptrace call. */ |
| tid = GET_THREAD_ID (inferior_ptid); |
| |
| /* Get the general registers from the process. */ |
| ret = ptrace (PTRACE_GETREGS, tid, 0, ®s); |
| if (ret < 0) |
| { |
| warning (_("Unable to fetch general registers.")); |
| return; |
| } |
| |
| if (regno >= ARM_A1_REGNUM && regno <= ARM_PC_REGNUM) |
| regcache_raw_collect (regcache, regno, (char *) ®s[regno]); |
| else if (arm_apcs_32 && regno == ARM_PS_REGNUM) |
| regcache_raw_collect (regcache, regno, |
| (char *) ®s[ARM_CPSR_REGNUM]); |
| else if (!arm_apcs_32 && regno == ARM_PS_REGNUM) |
| regcache_raw_collect (regcache, ARM_PC_REGNUM, |
| (char *) ®s[ARM_PC_REGNUM]); |
| |
| ret = ptrace (PTRACE_SETREGS, tid, 0, ®s); |
| if (ret < 0) |
| { |
| warning (_("Unable to store general register.")); |
| return; |
| } |
| } |
| |
| static void |
| store_regs (const struct regcache *regcache) |
| { |
| int ret, regno, tid; |
| elf_gregset_t regs; |
| |
| /* Get the thread id for the ptrace call. */ |
| tid = GET_THREAD_ID (inferior_ptid); |
| |
| /* Fetch the general registers. */ |
| ret = ptrace (PTRACE_GETREGS, tid, 0, ®s); |
| if (ret < 0) |
| { |
| warning (_("Unable to fetch general registers.")); |
| return; |
| } |
| |
| for (regno = ARM_A1_REGNUM; regno <= ARM_PC_REGNUM; regno++) |
| { |
| if (regcache_valid_p (regcache, regno)) |
| regcache_raw_collect (regcache, regno, (char *) ®s[regno]); |
| } |
| |
| if (arm_apcs_32 && regcache_valid_p (regcache, ARM_PS_REGNUM)) |
| regcache_raw_collect (regcache, ARM_PS_REGNUM, |
| (char *) ®s[ARM_CPSR_REGNUM]); |
| |
| ret = ptrace (PTRACE_SETREGS, tid, 0, ®s); |
| |
| if (ret < 0) |
| { |
| warning (_("Unable to store general registers.")); |
| return; |
| } |
| } |
| |
| /* Fetch all WMMX registers of the process and store into |
| regcache. */ |
| |
| #define IWMMXT_REGS_SIZE (16 * 8 + 6 * 4) |
| |
| static void |
| fetch_wmmx_regs (struct regcache *regcache) |
| { |
| char regbuf[IWMMXT_REGS_SIZE]; |
| int ret, regno, tid; |
| |
| /* Get the thread id for the ptrace call. */ |
| tid = GET_THREAD_ID (inferior_ptid); |
| |
| ret = ptrace (PTRACE_GETWMMXREGS, tid, 0, regbuf); |
| if (ret < 0) |
| { |
| warning (_("Unable to fetch WMMX registers.")); |
| return; |
| } |
| |
| for (regno = 0; regno < 16; regno++) |
| regcache_raw_supply (regcache, regno + ARM_WR0_REGNUM, |
| ®buf[regno * 8]); |
| |
| for (regno = 0; regno < 2; regno++) |
| regcache_raw_supply (regcache, regno + ARM_WCSSF_REGNUM, |
| ®buf[16 * 8 + regno * 4]); |
| |
| for (regno = 0; regno < 4; regno++) |
| regcache_raw_supply (regcache, regno + ARM_WCGR0_REGNUM, |
| ®buf[16 * 8 + 2 * 4 + regno * 4]); |
| } |
| |
| static void |
| store_wmmx_regs (const struct regcache *regcache) |
| { |
| char regbuf[IWMMXT_REGS_SIZE]; |
| int ret, regno, tid; |
| |
| /* Get the thread id for the ptrace call. */ |
| tid = GET_THREAD_ID (inferior_ptid); |
| |
| ret = ptrace (PTRACE_GETWMMXREGS, tid, 0, regbuf); |
| if (ret < 0) |
| { |
| warning (_("Unable to fetch WMMX registers.")); |
| return; |
| } |
| |
| for (regno = 0; regno < 16; regno++) |
| if (regcache_valid_p (regcache, regno + ARM_WR0_REGNUM)) |
| regcache_raw_collect (regcache, regno + ARM_WR0_REGNUM, |
| ®buf[regno * 8]); |
| |
| for (regno = 0; regno < 2; regno++) |
| if (regcache_valid_p (regcache, regno + ARM_WCSSF_REGNUM)) |
| regcache_raw_collect (regcache, regno + ARM_WCSSF_REGNUM, |
| ®buf[16 * 8 + regno * 4]); |
| |
| for (regno = 0; regno < 4; regno++) |
| if (regcache_valid_p (regcache, regno + ARM_WCGR0_REGNUM)) |
| regcache_raw_collect (regcache, regno + ARM_WCGR0_REGNUM, |
| ®buf[16 * 8 + 2 * 4 + regno * 4]); |
| |
| ret = ptrace (PTRACE_SETWMMXREGS, tid, 0, regbuf); |
| |
| if (ret < 0) |
| { |
| warning (_("Unable to store WMMX registers.")); |
| return; |
| } |
| } |
| |
| /* 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. */ |
| |
| static void |
| arm_linux_fetch_inferior_registers (struct regcache *regcache, int regno) |
| { |
| if (-1 == regno) |
| { |
| fetch_regs (regcache); |
| fetch_fpregs (regcache); |
| if (arm_linux_has_wmmx_registers) |
| fetch_wmmx_regs (regcache); |
| } |
| else |
| { |
| if (regno < ARM_F0_REGNUM || regno == ARM_PS_REGNUM) |
| fetch_register (regcache, regno); |
| else if (regno >= ARM_F0_REGNUM && regno <= ARM_FPS_REGNUM) |
| fetch_fpregister (regcache, regno); |
| else if (arm_linux_has_wmmx_registers |
| && regno >= ARM_WR0_REGNUM && regno <= ARM_WCGR7_REGNUM) |
| fetch_wmmx_regs (regcache); |
| } |
| } |
| |
| /* Store registers back into the inferior. Store all registers if |
| regno == -1, otherwise store all general registers or all floating |
| point registers depending upon the value of regno. */ |
| |
| static void |
| arm_linux_store_inferior_registers (struct regcache *regcache, int regno) |
| { |
| if (-1 == regno) |
| { |
| store_regs (regcache); |
| store_fpregs (regcache); |
| if (arm_linux_has_wmmx_registers) |
| store_wmmx_regs (regcache); |
| } |
| else |
| { |
| if (regno < ARM_F0_REGNUM || regno == ARM_PS_REGNUM) |
| store_register (regcache, regno); |
| else if ((regno >= ARM_F0_REGNUM) && (regno <= ARM_FPS_REGNUM)) |
| store_fpregister (regcache, regno); |
| else if (arm_linux_has_wmmx_registers |
| && regno >= ARM_WR0_REGNUM && regno <= ARM_WCGR7_REGNUM) |
| store_wmmx_regs (regcache); |
| } |
| } |
| |
| /* Wrapper functions for the standard regset handling, used by |
| thread debugging. */ |
| |
| void |
| fill_gregset (const struct regcache *regcache, |
| gdb_gregset_t *gregsetp, int regno) |
| { |
| arm_linux_collect_gregset (NULL, regcache, regno, gregsetp, 0); |
| } |
| |
| void |
| supply_gregset (struct regcache *regcache, const gdb_gregset_t *gregsetp) |
| { |
| arm_linux_supply_gregset (NULL, regcache, -1, gregsetp, 0); |
| } |
| |
| void |
| fill_fpregset (const struct regcache *regcache, |
| gdb_fpregset_t *fpregsetp, int regno) |
| { |
| arm_linux_collect_nwfpe (NULL, regcache, regno, fpregsetp, 0); |
| } |
| |
| /* Fill GDB's register array with the floating-point register values |
| in *fpregsetp. */ |
| |
| void |
| supply_fpregset (struct regcache *regcache, const gdb_fpregset_t *fpregsetp) |
| { |
| arm_linux_supply_nwfpe (NULL, regcache, -1, fpregsetp, 0); |
| } |
| |
| /* Fetch the thread-local storage pointer for libthread_db. */ |
| |
| ps_err_e |
| ps_get_thread_area (const struct ps_prochandle *ph, |
| lwpid_t lwpid, int idx, void **base) |
| { |
| if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, NULL, base) != 0) |
| return PS_ERR; |
| |
| /* IDX is the bias from the thread pointer to the beginning of the |
| thread descriptor. It has to be subtracted due to implementation |
| quirks in libthread_db. */ |
| *base = (void *) ((char *)*base - idx); |
| |
| return PS_OK; |
| } |
| |
| static unsigned int |
| get_linux_version (unsigned int *vmajor, |
| unsigned int *vminor, |
| unsigned int *vrelease) |
| { |
| struct utsname info; |
| char *pmajor, *pminor, *prelease, *tail; |
| |
| if (-1 == uname (&info)) |
| { |
| warning (_("Unable to determine GNU/Linux version.")); |
| return -1; |
| } |
| |
| pmajor = strtok (info.release, "."); |
| pminor = strtok (NULL, "."); |
| prelease = strtok (NULL, "."); |
| |
| *vmajor = (unsigned int) strtoul (pmajor, &tail, 0); |
| *vminor = (unsigned int) strtoul (pminor, &tail, 0); |
| *vrelease = (unsigned int) strtoul (prelease, &tail, 0); |
| |
| return ((*vmajor << 16) | (*vminor << 8) | *vrelease); |
| } |
| |
| static const struct target_desc * |
| arm_linux_read_description (struct target_ops *ops) |
| { |
| int ret; |
| char regbuf[IWMMXT_REGS_SIZE]; |
| |
| ret = ptrace (PTRACE_GETWMMXREGS, GET_THREAD_ID (inferior_ptid), |
| 0, regbuf); |
| if (ret < 0) |
| arm_linux_has_wmmx_registers = 0; |
| else |
| arm_linux_has_wmmx_registers = 1; |
| |
| if (arm_linux_has_wmmx_registers) |
| return tdesc_arm_with_iwmmxt; |
| else |
| return NULL; |
| } |
| |
| void _initialize_arm_linux_nat (void); |
| |
| void |
| _initialize_arm_linux_nat (void) |
| { |
| struct target_ops *t; |
| |
| os_version = get_linux_version (&os_major, &os_minor, &os_release); |
| |
| /* Fill in the generic GNU/Linux methods. */ |
| t = linux_target (); |
| |
| /* Add our register access methods. */ |
| t->to_fetch_registers = arm_linux_fetch_inferior_registers; |
| t->to_store_registers = arm_linux_store_inferior_registers; |
| |
| t->to_read_description = arm_linux_read_description; |
| |
| /* Register the target. */ |
| linux_nat_add_target (t); |
| |
| /* Initialize the standard target descriptions. */ |
| initialize_tdesc_arm_with_iwmmxt (); |
| } |