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, 2008
   4    Free Software Foundation, Inc.
   5
   6    This file is part of GDB.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  20
  21 /* This file is used for both 31-bit and 64-bit S/390 systems.  */
  22
  23 #include "server.h"
  24 #include "linux-low.h"
  25
  26 #include <asm/ptrace.h>
  27
  28 #define s390_num_regs 51
  29
  30 static int s390_regmap[] = {
  31   PT_PSWMASK, PT_PSWADDR,
  32
  33   PT_GPR0, PT_GPR1, PT_GPR2, PT_GPR3,
  34   PT_GPR4, PT_GPR5, PT_GPR6, PT_GPR7,
  35   PT_GPR8, PT_GPR9, PT_GPR10, PT_GPR11,
  36   PT_GPR12, PT_GPR13, PT_GPR14, PT_GPR15,
  37
  38   PT_ACR0, PT_ACR1, PT_ACR2, PT_ACR3,
  39   PT_ACR4, PT_ACR5, PT_ACR6, PT_ACR7,
  40   PT_ACR8, PT_ACR9, PT_ACR10, PT_ACR11,
  41   PT_ACR12, PT_ACR13, PT_ACR14, PT_ACR15,
  42
  43   PT_FPC,
  44
  45 #ifndef __s390x__
  46   PT_FPR0_HI, PT_FPR1_HI, PT_FPR2_HI, PT_FPR3_HI,
  47   PT_FPR4_HI, PT_FPR5_HI, PT_FPR6_HI, PT_FPR7_HI,
  48   PT_FPR8_HI, PT_FPR9_HI, PT_FPR10_HI, PT_FPR11_HI,
  49   PT_FPR12_HI, PT_FPR13_HI, PT_FPR14_HI, PT_FPR15_HI,
  50 #else
  51   PT_FPR0, PT_FPR1, PT_FPR2, PT_FPR3,
  52   PT_FPR4, PT_FPR5, PT_FPR6, PT_FPR7,
  53   PT_FPR8, PT_FPR9, PT_FPR10, PT_FPR11,
  54   PT_FPR12, PT_FPR13, PT_FPR14, PT_FPR15,
  55 #endif
  56 };
  57
  58 static int
  59 s390_cannot_fetch_register (int regno)
  60 {
  61   if (s390_regmap[regno] == -1)
  62     return 1;
  63
  64   return 0;
  65 }
  66
  67 static int
  68 s390_cannot_store_register (int regno)
  69 {
  70   if (s390_regmap[regno] == -1)
  71     return 1;
  72
  73   return 0;
  74 }
  75
  76 /* Provide only a fill function for the general register set.  ps_lgetregs
  77    will use this for NPTL support.  */
  78
  79 static void s390_fill_gregset (void *buf)
  80 {
  81   int i;
  82
  83   for (i = 0; i < 34; i++)
  84     collect_register (i, (char *) buf + s390_regmap[i]);
  85 }
  86
  87 struct regset_info target_regsets[] = {
  88   { 0, 0, 0, GENERAL_REGS, s390_fill_gregset, NULL },
  89   { 0, 0, -1, -1, NULL, NULL }
  90 };
  91
  92
  93 static const unsigned char s390_breakpoint[] = { 0, 1 };
  94 #define s390_breakpoint_len 2
  95
  96 static CORE_ADDR
  97 s390_get_pc ()
  98 {
  99   unsigned long pc;
 100   collect_register_by_name ("pswa", &pc);
 101 #ifndef __s390x__
 102   pc &= 0x7fffffff;
 103 #endif
 104   return pc;
 105 }
 106
 107 static void
 108 s390_set_pc (CORE_ADDR newpc)
 109 {
 110   unsigned long pc = newpc;
 111 #ifndef __s390x__
 112   pc |= 0x80000000;
 113 #endif
 114   supply_register_by_name ("pswa", &pc);
 115 }
 116
 117 static int
 118 s390_breakpoint_at (CORE_ADDR pc)
 119 {
 120   unsigned char c[s390_breakpoint_len];
 121   read_inferior_memory (pc, c, s390_breakpoint_len);
 122   return memcmp (c, s390_breakpoint, s390_breakpoint_len) == 0;
 123 }
 124
 125
 126 struct linux_target_ops the_low_target = {
 127   s390_num_regs,
 128   s390_regmap,
 129   s390_cannot_fetch_register,
 130   s390_cannot_store_register,
 131   s390_get_pc,
 132   s390_set_pc,
 133   s390_breakpoint,
 134   s390_breakpoint_len,
 135   NULL,
 136   s390_breakpoint_len,
 137   s390_breakpoint_at,
 138 };
 139