diff options
Diffstat (limited to 'contrib/gdb/gdb/s390-nat.c')
-rw-r--r-- | contrib/gdb/gdb/s390-nat.c | 359 |
1 files changed, 359 insertions, 0 deletions
diff --git a/contrib/gdb/gdb/s390-nat.c b/contrib/gdb/gdb/s390-nat.c new file mode 100644 index 0000000..b8da548 --- /dev/null +++ b/contrib/gdb/gdb/s390-nat.c @@ -0,0 +1,359 @@ +/* S390 native-dependent code for GDB, the GNU debugger. + Copyright 2001, 2003 Free Software Foundation, Inc + + Contributed by D.J. Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com) + for IBM Deutschland Entwicklung GmbH, IBM Corporation. + + 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 "tm.h" +#include "regcache.h" +#include "inferior.h" + +#include "s390-tdep.h" + +#include <asm/ptrace.h> +#include <sys/ptrace.h> +#include <asm/types.h> +#include <sys/procfs.h> +#include <sys/user.h> +#include <sys/ucontext.h> + + +/* Map registers to gregset/ptrace offsets. + These arrays are defined in s390-tdep.c. */ + +#ifdef __s390x__ +#define regmap_gregset s390x_regmap_gregset +#else +#define regmap_gregset s390_regmap_gregset +#endif + +#define regmap_fpregset s390_regmap_fpregset + +/* When debugging a 32-bit executable running under a 64-bit kernel, + we have to fix up the 64-bit registers we get from the kernel + to make them look like 32-bit registers. */ +#ifdef __s390x__ +#define SUBOFF(i) \ + ((TARGET_PTR_BIT == 32 \ + && ((i) == S390_PSWA_REGNUM \ + || ((i) >= S390_R0_REGNUM && (i) <= S390_R15_REGNUM)))? 4 : 0) +#else +#define SUBOFF(i) 0 +#endif + + +/* Fill GDB's register array with the general-purpose register values + in *REGP. */ +void +supply_gregset (gregset_t *regp) +{ + int i; + for (i = 0; i < S390_NUM_REGS; i++) + if (regmap_gregset[i] != -1) + regcache_raw_supply (current_regcache, i, + (char *)regp + regmap_gregset[i] + SUBOFF (i)); +} + +/* Fill register REGNO (if it is a general-purpose register) in + *REGP with the value in GDB's register array. If REGNO is -1, + do this for all registers. */ +void +fill_gregset (gregset_t *regp, int regno) +{ + int i; + for (i = 0; i < S390_NUM_REGS; i++) + if (regmap_gregset[i] != -1) + if (regno == -1 || regno == i) + regcache_raw_collect (current_regcache, i, + (char *)regp + regmap_gregset[i] + SUBOFF (i)); +} + +/* Fill GDB's register array with the floating-point register values + in *REGP. */ +void +supply_fpregset (fpregset_t *regp) +{ + int i; + for (i = 0; i < S390_NUM_REGS; i++) + if (regmap_fpregset[i] != -1) + regcache_raw_supply (current_regcache, i, + ((char *)regp) + regmap_fpregset[i]); +} + +/* Fill register REGNO (if it is a general-purpose register) in + *REGP with the value in GDB's register array. If REGNO is -1, + do this for all registers. */ +void +fill_fpregset (fpregset_t *regp, int regno) +{ + int i; + for (i = 0; i < S390_NUM_REGS; i++) + if (regmap_fpregset[i] != -1) + if (regno == -1 || regno == i) + regcache_raw_collect (current_regcache, i, + ((char *)regp) + regmap_fpregset[i]); +} + +/* Find the TID for the current inferior thread to use with ptrace. */ +static int +s390_inferior_tid (void) +{ + /* GNU/Linux LWP ID's are process ID's. */ + int tid = TIDGET (inferior_ptid); + if (tid == 0) + tid = PIDGET (inferior_ptid); /* Not a threaded program. */ + + return tid; +} + +/* Fetch all general-purpose registers from process/thread TID and + store their values in GDB's register cache. */ +static void +fetch_regs (int tid) +{ + gregset_t regs; + ptrace_area parea; + + parea.len = sizeof (regs); + parea.process_addr = (addr_t) ®s; + parea.kernel_addr = offsetof (struct user_regs_struct, psw); + if (ptrace (PTRACE_PEEKUSR_AREA, tid, (long) &parea) < 0) + perror_with_name ("Couldn't get registers"); + + supply_gregset (®s); +} + +/* Store all valid general-purpose registers in GDB's register cache + into the process/thread specified by TID. */ +static void +store_regs (int tid, int regnum) +{ + gregset_t regs; + ptrace_area parea; + + parea.len = sizeof (regs); + parea.process_addr = (addr_t) ®s; + parea.kernel_addr = offsetof (struct user_regs_struct, psw); + if (ptrace (PTRACE_PEEKUSR_AREA, tid, (long) &parea) < 0) + perror_with_name ("Couldn't get registers"); + + fill_gregset (®s, regnum); + + if (ptrace (PTRACE_POKEUSR_AREA, tid, (long) &parea) < 0) + perror_with_name ("Couldn't write registers"); +} + +/* Fetch all floating-point registers from process/thread TID and store + their values in GDB's register cache. */ +static void +fetch_fpregs (int tid) +{ + fpregset_t fpregs; + ptrace_area parea; + + parea.len = sizeof (fpregs); + parea.process_addr = (addr_t) &fpregs; + parea.kernel_addr = offsetof (struct user_regs_struct, fp_regs); + if (ptrace (PTRACE_PEEKUSR_AREA, tid, (long) &parea) < 0) + perror_with_name ("Couldn't get floating point status"); + + supply_fpregset (&fpregs); +} + +/* Store all valid floating-point registers in GDB's register cache + into the process/thread specified by TID. */ +static void +store_fpregs (int tid, int regnum) +{ + fpregset_t fpregs; + ptrace_area parea; + + parea.len = sizeof (fpregs); + parea.process_addr = (addr_t) &fpregs; + parea.kernel_addr = offsetof (struct user_regs_struct, fp_regs); + if (ptrace (PTRACE_PEEKUSR_AREA, tid, (long) &parea) < 0) + perror_with_name ("Couldn't get floating point status"); + + fill_fpregset (&fpregs, regnum); + + if (ptrace (PTRACE_POKEUSR_AREA, tid, (long) &parea) < 0) + perror_with_name ("Couldn't write floating point status"); +} + +/* Fetch register REGNUM from the child process. If REGNUM is -1, do + this for all registers. */ +void +fetch_inferior_registers (int regnum) +{ + int tid = s390_inferior_tid (); + + if (regnum == -1 + || (regnum < S390_NUM_REGS && regmap_gregset[regnum] != -1)) + fetch_regs (tid); + + if (regnum == -1 + || (regnum < S390_NUM_REGS && regmap_fpregset[regnum] != -1)) + fetch_fpregs (tid); +} + +/* Store register REGNUM back into the child process. If REGNUM is + -1, do this for all registers. */ +void +store_inferior_registers (int regnum) +{ + int tid = s390_inferior_tid (); + + if (regnum == -1 + || (regnum < S390_NUM_REGS && regmap_gregset[regnum] != -1)) + store_regs (tid, regnum); + + if (regnum == -1 + || (regnum < S390_NUM_REGS && regmap_fpregset[regnum] != -1)) + store_fpregs (tid, regnum); +} + + +/* Hardware-assisted watchpoint handling. */ + +/* We maintain a list of all currently active watchpoints in order + to properly handle watchpoint removal. + + The only thing we actually need is the total address space area + spanned by the watchpoints. */ + +struct watch_area +{ + struct watch_area *next; + CORE_ADDR lo_addr; + CORE_ADDR hi_addr; +}; + +static struct watch_area *watch_base = NULL; + +int +s390_stopped_by_watchpoint (void) +{ + per_lowcore_bits per_lowcore; + ptrace_area parea; + + /* Speed up common case. */ + if (!watch_base) + return 0; + + parea.len = sizeof (per_lowcore); + parea.process_addr = (addr_t) & per_lowcore; + parea.kernel_addr = offsetof (struct user_regs_struct, per_info.lowcore); + if (ptrace (PTRACE_PEEKUSR_AREA, s390_inferior_tid (), &parea) < 0) + perror_with_name ("Couldn't retrieve watchpoint status"); + + return per_lowcore.perc_storage_alteration == 1 + && per_lowcore.perc_store_real_address == 0; +} + +static void +s390_fix_watch_points (void) +{ + int tid = s390_inferior_tid (); + + per_struct per_info; + ptrace_area parea; + + CORE_ADDR watch_lo_addr = (CORE_ADDR)-1, watch_hi_addr = 0; + struct watch_area *area; + + for (area = watch_base; area; area = area->next) + { + watch_lo_addr = min (watch_lo_addr, area->lo_addr); + watch_hi_addr = max (watch_hi_addr, area->hi_addr); + } + + parea.len = sizeof (per_info); + parea.process_addr = (addr_t) & per_info; + parea.kernel_addr = offsetof (struct user_regs_struct, per_info); + if (ptrace (PTRACE_PEEKUSR_AREA, tid, &parea) < 0) + perror_with_name ("Couldn't retrieve watchpoint status"); + + if (watch_base) + { + per_info.control_regs.bits.em_storage_alteration = 1; + per_info.control_regs.bits.storage_alt_space_ctl = 1; + } + else + { + per_info.control_regs.bits.em_storage_alteration = 0; + per_info.control_regs.bits.storage_alt_space_ctl = 0; + } + per_info.starting_addr = watch_lo_addr; + per_info.ending_addr = watch_hi_addr; + + if (ptrace (PTRACE_POKEUSR_AREA, tid, &parea) < 0) + perror_with_name ("Couldn't modify watchpoint status"); +} + +int +s390_insert_watchpoint (CORE_ADDR addr, int len) +{ + struct watch_area *area = xmalloc (sizeof (struct watch_area)); + if (!area) + return -1; + + area->lo_addr = addr; + area->hi_addr = addr + len - 1; + + area->next = watch_base; + watch_base = area; + + s390_fix_watch_points (); + return 0; +} + +int +s390_remove_watchpoint (CORE_ADDR addr, int len) +{ + struct watch_area *area, **parea; + + for (parea = &watch_base; *parea; parea = &(*parea)->next) + if ((*parea)->lo_addr == addr + && (*parea)->hi_addr == addr + len - 1) + break; + + if (!*parea) + { + fprintf_unfiltered (gdb_stderr, + "Attempt to remove nonexistent watchpoint.\n"); + return -1; + } + + area = *parea; + *parea = area->next; + xfree (area); + + s390_fix_watch_points (); + return 0; +} + + +int +kernel_u_size (void) +{ + return sizeof (struct user); +} + |