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 /* Defined in auto-generated file reg-s390.c.  */
  29 void init_registers_s390 (void);
  30 /* Defined in auto-generated file reg-s390x.c.  */
  31 void init_registers_s390x (void);
  32
  33
  34 #define s390_num_regs 51
  35
  36 static int s390_regmap[] = {
  37   PT_PSWMASK, PT_PSWADDR,
  38
  39   PT_GPR0, PT_GPR1, PT_GPR2, PT_GPR3,
  40   PT_GPR4, PT_GPR5, PT_GPR6, PT_GPR7,
  41   PT_GPR8, PT_GPR9, PT_GPR10, PT_GPR11,
  42   PT_GPR12, PT_GPR13, PT_GPR14, PT_GPR15,
  43
  44   PT_ACR0, PT_ACR1, PT_ACR2, PT_ACR3,
  45   PT_ACR4, PT_ACR5, PT_ACR6, PT_ACR7,
  46   PT_ACR8, PT_ACR9, PT_ACR10, PT_ACR11,
  47   PT_ACR12, PT_ACR13, PT_ACR14, PT_ACR15,
  48
  49   PT_FPC,
  50
  51 #ifndef __s390x__
  52   PT_FPR0_HI, PT_FPR1_HI, PT_FPR2_HI, PT_FPR3_HI,
  53   PT_FPR4_HI, PT_FPR5_HI, PT_FPR6_HI, PT_FPR7_HI,
  54   PT_FPR8_HI, PT_FPR9_HI, PT_FPR10_HI, PT_FPR11_HI,
  55   PT_FPR12_HI, PT_FPR13_HI, PT_FPR14_HI, PT_FPR15_HI,
  56 #else
  57   PT_FPR0, PT_FPR1, PT_FPR2, PT_FPR3,
  58   PT_FPR4, PT_FPR5, PT_FPR6, PT_FPR7,
  59   PT_FPR8, PT_FPR9, PT_FPR10, PT_FPR11,
  60   PT_FPR12, PT_FPR13, PT_FPR14, PT_FPR15,
  61 #endif
  62 };
  63
  64 static int
  65 s390_cannot_fetch_register (int regno)
  66 {
  67   if (s390_regmap[regno] == -1)
  68     return 1;
  69
  70   return 0;
  71 }
  72
  73 static int
  74 s390_cannot_store_register (int regno)
  75 {
  76   if (s390_regmap[regno] == -1)
  77     return 1;
  78
  79   return 0;
  80 }
  81
  82 /* Provide only a fill function for the general register set.  ps_lgetregs
  83    will use this for NPTL support.  */
  84
  85 static void s390_fill_gregset (void *buf)
  86 {
  87   int i;
  88
  89   for (i = 0; i < 34; i++)
  90     collect_register (i, (char *) buf + s390_regmap[i]);
  91 }
  92
  93 struct regset_info target_regsets[] = {
  94   { 0, 0, 0, GENERAL_REGS, s390_fill_gregset, NULL },
  95   { 0, 0, -1, -1, NULL, NULL }
  96 };
  97
  98
  99 static const unsigned char s390_breakpoint[] = { 0, 1 };
 100 #define s390_breakpoint_len 2
 101
 102 static CORE_ADDR
 103 s390_get_pc ()
 104 {
 105   unsigned long pc;
 106   collect_register_by_name ("pswa", &pc);
 107 #ifndef __s390x__
 108   pc &= 0x7fffffff;
 109 #endif
 110   return pc;
 111 }
 112
 113 static void
 114 s390_set_pc (CORE_ADDR newpc)
 115 {
 116   unsigned long pc = newpc;
 117 #ifndef __s390x__
 118   pc |= 0x80000000;
 119 #endif
 120   supply_register_by_name ("pswa", &pc);
 121 }
 122
 123 static int
 124 s390_breakpoint_at (CORE_ADDR pc)
 125 {
 126   unsigned char c[s390_breakpoint_len];
 127   read_inferior_memory (pc, c, s390_breakpoint_len);
 128   return memcmp (c, s390_breakpoint, s390_breakpoint_len) == 0;
 129 }
 130
 131
 132 struct linux_target_ops the_low_target = {
 133 #ifndef __s390x__
 134   init_registers_s390,
 135 #else
 136   init_registers_s390x,
 137 #endif
 138   s390_num_regs,
 139   s390_regmap,
 140   s390_cannot_fetch_register,
 141   s390_cannot_store_register,
 142   s390_get_pc,
 143   s390_set_pc,
 144   s390_breakpoint,
 145   s390_breakpoint_len,
 146   NULL,
 147   s390_breakpoint_len,
 148   s390_breakpoint_at,
 149 };
 150