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323 lines
8.1 KiB
C
323 lines
8.1 KiB
C
/* GNU/Linux S/390 specific low level interface, for the remote server
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for GDB.
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Copyright (C) 2001, 2002, 2005, 2006, 2007, 2008, 2009, 2010
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Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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/* This file is used for both 31-bit and 64-bit S/390 systems. */
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#include "server.h"
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#include "linux-low.h"
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#include <asm/ptrace.h>
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#include <elf.h>
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#ifndef HWCAP_S390_HIGH_GPRS
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#define HWCAP_S390_HIGH_GPRS 512
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#endif
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/* Defined in auto-generated file s390-linux32.c. */
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void init_registers_s390_linux32 (void);
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/* Defined in auto-generated file s390-linux64.c. */
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void init_registers_s390_linux64 (void);
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/* Defined in auto-generated file s390x-linux64.c. */
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void init_registers_s390x_linux64 (void);
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#define s390_num_regs 51
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static int s390_regmap[] = {
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PT_PSWMASK, PT_PSWADDR,
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PT_GPR0, PT_GPR1, PT_GPR2, PT_GPR3,
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PT_GPR4, PT_GPR5, PT_GPR6, PT_GPR7,
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PT_GPR8, PT_GPR9, PT_GPR10, PT_GPR11,
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PT_GPR12, PT_GPR13, PT_GPR14, PT_GPR15,
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PT_ACR0, PT_ACR1, PT_ACR2, PT_ACR3,
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PT_ACR4, PT_ACR5, PT_ACR6, PT_ACR7,
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PT_ACR8, PT_ACR9, PT_ACR10, PT_ACR11,
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PT_ACR12, PT_ACR13, PT_ACR14, PT_ACR15,
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PT_FPC,
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#ifndef __s390x__
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PT_FPR0_HI, PT_FPR1_HI, PT_FPR2_HI, PT_FPR3_HI,
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PT_FPR4_HI, PT_FPR5_HI, PT_FPR6_HI, PT_FPR7_HI,
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PT_FPR8_HI, PT_FPR9_HI, PT_FPR10_HI, PT_FPR11_HI,
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PT_FPR12_HI, PT_FPR13_HI, PT_FPR14_HI, PT_FPR15_HI,
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#else
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PT_FPR0, PT_FPR1, PT_FPR2, PT_FPR3,
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PT_FPR4, PT_FPR5, PT_FPR6, PT_FPR7,
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PT_FPR8, PT_FPR9, PT_FPR10, PT_FPR11,
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PT_FPR12, PT_FPR13, PT_FPR14, PT_FPR15,
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#endif
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};
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#ifdef __s390x__
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#define s390_num_regs_3264 67
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static int s390_regmap_3264[] = {
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PT_PSWMASK, PT_PSWADDR,
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PT_GPR0, PT_GPR0, PT_GPR1, PT_GPR1, PT_GPR2, PT_GPR2, PT_GPR3, PT_GPR3,
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PT_GPR4, PT_GPR4, PT_GPR5, PT_GPR5, PT_GPR6, PT_GPR6, PT_GPR7, PT_GPR7,
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PT_GPR8, PT_GPR8, PT_GPR9, PT_GPR9, PT_GPR10, PT_GPR10, PT_GPR11, PT_GPR11,
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PT_GPR12, PT_GPR12, PT_GPR13, PT_GPR13, PT_GPR14, PT_GPR14, PT_GPR15, PT_GPR15,
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PT_ACR0, PT_ACR1, PT_ACR2, PT_ACR3,
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PT_ACR4, PT_ACR5, PT_ACR6, PT_ACR7,
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PT_ACR8, PT_ACR9, PT_ACR10, PT_ACR11,
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PT_ACR12, PT_ACR13, PT_ACR14, PT_ACR15,
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PT_FPC,
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PT_FPR0, PT_FPR1, PT_FPR2, PT_FPR3,
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PT_FPR4, PT_FPR5, PT_FPR6, PT_FPR7,
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PT_FPR8, PT_FPR9, PT_FPR10, PT_FPR11,
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PT_FPR12, PT_FPR13, PT_FPR14, PT_FPR15,
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};
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#endif
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static int
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s390_cannot_fetch_register (int regno)
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{
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return 0;
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}
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static int
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s390_cannot_store_register (int regno)
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{
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return 0;
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}
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static void
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s390_collect_ptrace_register (struct regcache *regcache, int regno, char *buf)
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{
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int size = register_size (regno);
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if (size < sizeof (long))
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{
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int regaddr = the_low_target.regmap[regno];
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memset (buf, 0, sizeof (long));
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if ((regno ^ 1) < the_low_target.num_regs
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&& the_low_target.regmap[regno ^ 1] == regaddr)
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{
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collect_register (regcache, regno & ~1, buf);
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collect_register (regcache, (regno & ~1) + 1,
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buf + sizeof (long) - size);
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}
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else if (regaddr == PT_PSWADDR
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|| (regaddr >= PT_GPR0 && regaddr <= PT_GPR15))
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collect_register (regcache, regno, buf + sizeof (long) - size);
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else
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collect_register (regcache, regno, buf);
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/* When debugging a 32-bit inferior on a 64-bit host, make sure
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the 31-bit addressing mode bit is set in the PSW mask. */
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if (regaddr == PT_PSWMASK)
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buf[size] |= 0x80;
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}
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else
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collect_register (regcache, regno, buf);
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}
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static void
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s390_supply_ptrace_register (struct regcache *regcache, int regno, const char *buf)
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{
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int size = register_size (regno);
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if (size < sizeof (long))
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{
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int regaddr = the_low_target.regmap[regno];
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if ((regno ^ 1) < the_low_target.num_regs
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&& the_low_target.regmap[regno ^ 1] == regaddr)
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{
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supply_register (regcache, regno & ~1, buf);
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supply_register (regcache, (regno & ~1) + 1,
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buf + sizeof (long) - size);
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}
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else if (regaddr == PT_PSWADDR
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|| (regaddr >= PT_GPR0 && regaddr <= PT_GPR15))
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supply_register (regcache, regno, buf + sizeof (long) - size);
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else
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supply_register (regcache, regno, buf);
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}
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else
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supply_register (regcache, regno, buf);
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}
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/* Provide only a fill function for the general register set. ps_lgetregs
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will use this for NPTL support. */
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static void s390_fill_gregset (struct regcache *regcache, void *buf)
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{
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int i;
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for (i = 0; i < the_low_target.num_regs; i++)
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{
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if (the_low_target.regmap[i] < PT_PSWMASK
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|| the_low_target.regmap[i] > PT_ACR15)
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continue;
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s390_collect_ptrace_register (regcache, i, (char *) buf
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+ the_low_target.regmap[i]);
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}
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}
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struct regset_info target_regsets[] = {
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{ 0, 0, 0, 0, GENERAL_REGS, s390_fill_gregset, NULL },
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{ 0, 0, 0, -1, -1, NULL, NULL }
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};
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static const unsigned char s390_breakpoint[] = { 0, 1 };
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#define s390_breakpoint_len 2
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static CORE_ADDR
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s390_get_pc (struct regcache *regcache)
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{
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if (register_size (0) == 4)
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{
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unsigned int pc;
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collect_register_by_name (regcache, "pswa", &pc);
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#ifndef __s390x__
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pc &= 0x7fffffff;
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#endif
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return pc;
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}
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else
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{
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unsigned long pc;
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collect_register_by_name (regcache, "pswa", &pc);
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return pc;
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}
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}
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static void
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s390_set_pc (struct regcache *regcache, CORE_ADDR newpc)
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{
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if (register_size (0) == 4)
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{
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unsigned int pc = newpc;
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#ifndef __s390x__
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pc |= 0x80000000;
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#endif
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supply_register_by_name (regcache, "pswa", &pc);
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}
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else
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{
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unsigned long pc = newpc;
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supply_register_by_name (regcache, "pswa", &pc);
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}
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}
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#ifdef __s390x__
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static unsigned long
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s390_get_hwcap (void)
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{
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int wordsize = register_size (0);
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unsigned char *data = alloca (2 * wordsize);
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int offset = 0;
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while ((*the_target->read_auxv) (offset, data, 2 * wordsize) == 2 * wordsize)
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{
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if (wordsize == 4)
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{
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unsigned int *data_p = (unsigned int *)data;
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if (data_p[0] == AT_HWCAP)
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return data_p[1];
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}
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else
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{
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unsigned long *data_p = (unsigned long *)data;
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if (data_p[0] == AT_HWCAP)
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return data_p[1];
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}
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offset += 2 * wordsize;
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}
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return 0;
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}
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#endif
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static void
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s390_arch_setup (void)
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{
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/* Assume 31-bit inferior process. */
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init_registers_s390_linux32 ();
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the_low_target.num_regs = s390_num_regs;
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the_low_target.regmap = s390_regmap;
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/* On a 64-bit host, check the low bit of the (31-bit) PSWM
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-- if this is one, we actually have a 64-bit inferior. */
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#ifdef __s390x__
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{
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unsigned int pswm;
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struct regcache *regcache = new_register_cache ();
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fetch_inferior_registers (regcache, find_regno ("pswm"));
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collect_register_by_name (regcache, "pswm", &pswm);
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free_register_cache (regcache);
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if (pswm & 1)
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init_registers_s390x_linux64 ();
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/* For a 31-bit inferior, check whether the kernel supports
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using the full 64-bit GPRs. */
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else if (s390_get_hwcap () & HWCAP_S390_HIGH_GPRS)
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{
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init_registers_s390_linux64 ();
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the_low_target.num_regs = s390_num_regs_3264;
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the_low_target.regmap = s390_regmap_3264;
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}
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}
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#endif
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}
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static int
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s390_breakpoint_at (CORE_ADDR pc)
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{
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unsigned char c[s390_breakpoint_len];
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read_inferior_memory (pc, c, s390_breakpoint_len);
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return memcmp (c, s390_breakpoint, s390_breakpoint_len) == 0;
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}
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struct linux_target_ops the_low_target = {
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s390_arch_setup,
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s390_num_regs,
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s390_regmap,
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s390_cannot_fetch_register,
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s390_cannot_store_register,
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s390_get_pc,
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s390_set_pc,
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s390_breakpoint,
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s390_breakpoint_len,
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NULL,
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s390_breakpoint_len,
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s390_breakpoint_at,
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NULL,
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NULL,
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NULL,
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NULL,
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s390_collect_ptrace_register,
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s390_supply_ptrace_register,
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};
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