gdb/gdbserver/linux-s390-low.c

   1 /* GNU/Linux S/390 specific low level interface, for the remote server
   2    for GDB.
   3    Copyright (C) 2001, 2002, 2005, 2006, 2007 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 51 Franklin Street, Fifth Floor,
  20    Boston, MA 02110-1301, USA.  */
  21
  22 /* This file is used for both 31-bit and 64-bit S/390 systems.  */
  23
  24 #include "server.h"
  25 #include "linux-low.h"
  26
  27 #include <asm/ptrace.h>
  28
  29 #define s390_num_regs 51
  30
  31 static int s390_regmap[] = {
  32   PT_PSWMASK, PT_PSWADDR,
  33
  34   PT_GPR0, PT_GPR1, PT_GPR2, PT_GPR3,
  35   PT_GPR4, PT_GPR5, PT_GPR6, PT_GPR7,
  36   PT_GPR8, PT_GPR9, PT_GPR10, PT_GPR11,
  37   PT_GPR12, PT_GPR13, PT_GPR14, PT_GPR15,
  38
  39   PT_ACR0, PT_ACR1, PT_ACR2, PT_ACR3,
  40   PT_ACR4, PT_ACR5, PT_ACR6, PT_ACR7,
  41   PT_ACR8, PT_ACR9, PT_ACR10, PT_ACR11,
  42   PT_ACR12, PT_ACR13, PT_ACR14, PT_ACR15,
  43
  44   PT_FPC,
  45
  46 #ifndef __s390x__
  47   PT_FPR0_HI, PT_FPR1_HI, PT_FPR2_HI, PT_FPR3_HI,
  48   PT_FPR4_HI, PT_FPR5_HI, PT_FPR6_HI, PT_FPR7_HI,
  49   PT_FPR8_HI, PT_FPR9_HI, PT_FPR10_HI, PT_FPR11_HI,
  50   PT_FPR12_HI, PT_FPR13_HI, PT_FPR14_HI, PT_FPR15_HI,
  51 #else
  52   PT_FPR0, PT_FPR1, PT_FPR2, PT_FPR3,
  53   PT_FPR4, PT_FPR5, PT_FPR6, PT_FPR7,
  54   PT_FPR8, PT_FPR9, PT_FPR10, PT_FPR11,
  55   PT_FPR12, PT_FPR13, PT_FPR14, PT_FPR15,
  56 #endif
  57 };
  58
  59 static int
  60 s390_cannot_fetch_register (int regno)
  61 {
  62   if (s390_regmap[regno] == -1)
  63     return 1;
  64
  65   return 0;
  66 }
  67
  68 static int
  69 s390_cannot_store_register (int regno)
  70 {
  71   if (s390_regmap[regno] == -1)
  72     return 1;
  73
  74   return 0;
  75 }
  76
  77 /* Provide only a fill function for the general register set.  ps_lgetregs
  78    will use this for NPTL support.  */
  79
  80 static void s390_fill_gregset (void *buf)
  81 {
  82   int i;
  83
  84   for (i = 0; i < 34; i++)
  85     collect_register (i, (char *) buf + s390_regmap[i]);
  86 }
  87
  88 struct regset_info target_regsets[] = {
  89   { 0, 0, 0, GENERAL_REGS, s390_fill_gregset, NULL },
  90   { 0, 0, -1, -1, NULL, NULL }
  91 };
  92
  93
  94 static const unsigned char s390_breakpoint[] = { 0, 1 };
  95 #define s390_breakpoint_len 2
  96
  97 static CORE_ADDR
  98 s390_get_pc ()
  99 {
 100   unsigned long pc;
 101   collect_register_by_name ("pswa", &pc);
 102 #ifndef __s390x__
 103   pc &= 0x7fffffff;
 104 #endif
 105   return pc;
 106 }
 107
 108 static void
 109 s390_set_pc (CORE_ADDR newpc)
 110 {
 111   unsigned long pc = newpc;
 112 #ifndef __s390x__
 113   pc |= 0x80000000;
 114 #endif
 115   supply_register_by_name ("pswa", &pc);
 116 }
 117
 118 static int
 119 s390_breakpoint_at (CORE_ADDR pc)
 120 {
 121   unsigned char c[s390_breakpoint_len];
 122   read_inferior_memory (pc, c, s390_breakpoint_len);
 123   return memcmp (c, s390_breakpoint, s390_breakpoint_len) == 0;
 124 }
 125
 126
 127 struct linux_target_ops the_low_target = {
 128   s390_num_regs,
 129   s390_regmap,
 130   s390_cannot_fetch_register,
 131   s390_cannot_store_register,
 132   s390_get_pc,
 133   s390_set_pc,
 134   s390_breakpoint,
 135   s390_breakpoint_len,
 136   NULL,
 137   s390_breakpoint_len,
 138   s390_breakpoint_at,
 139 };
 140