| /* GNU/Linux S/390 specific low level interface, for the remote server |
| for GDB. |
| Copyright (C) 2001, 2002, 2005, 2006, 2007, 2008, 2009, 2010 |
| Free Software Foundation, Inc. |
| |
| 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 3 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, see <http://www.gnu.org/licenses/>. */ |
| |
| /* This file is used for both 31-bit and 64-bit S/390 systems. */ |
| |
| #include "server.h" |
| #include "linux-low.h" |
| |
| #include <asm/ptrace.h> |
| #include <elf.h> |
| |
| #ifndef HWCAP_S390_HIGH_GPRS |
| #define HWCAP_S390_HIGH_GPRS 512 |
| #endif |
| |
| /* Defined in auto-generated file s390-linux32.c. */ |
| void init_registers_s390_linux32 (void); |
| /* Defined in auto-generated file s390-linux64.c. */ |
| void init_registers_s390_linux64 (void); |
| /* Defined in auto-generated file s390x-linux64.c. */ |
| void init_registers_s390x_linux64 (void); |
| |
| #define s390_num_regs 51 |
| |
| static int s390_regmap[] = { |
| PT_PSWMASK, PT_PSWADDR, |
| |
| PT_GPR0, PT_GPR1, PT_GPR2, PT_GPR3, |
| PT_GPR4, PT_GPR5, PT_GPR6, PT_GPR7, |
| PT_GPR8, PT_GPR9, PT_GPR10, PT_GPR11, |
| PT_GPR12, PT_GPR13, PT_GPR14, PT_GPR15, |
| |
| PT_ACR0, PT_ACR1, PT_ACR2, PT_ACR3, |
| PT_ACR4, PT_ACR5, PT_ACR6, PT_ACR7, |
| PT_ACR8, PT_ACR9, PT_ACR10, PT_ACR11, |
| PT_ACR12, PT_ACR13, PT_ACR14, PT_ACR15, |
| |
| PT_FPC, |
| |
| #ifndef __s390x__ |
| PT_FPR0_HI, PT_FPR1_HI, PT_FPR2_HI, PT_FPR3_HI, |
| PT_FPR4_HI, PT_FPR5_HI, PT_FPR6_HI, PT_FPR7_HI, |
| PT_FPR8_HI, PT_FPR9_HI, PT_FPR10_HI, PT_FPR11_HI, |
| PT_FPR12_HI, PT_FPR13_HI, PT_FPR14_HI, PT_FPR15_HI, |
| #else |
| PT_FPR0, PT_FPR1, PT_FPR2, PT_FPR3, |
| PT_FPR4, PT_FPR5, PT_FPR6, PT_FPR7, |
| PT_FPR8, PT_FPR9, PT_FPR10, PT_FPR11, |
| PT_FPR12, PT_FPR13, PT_FPR14, PT_FPR15, |
| #endif |
| }; |
| |
| #ifdef __s390x__ |
| #define s390_num_regs_3264 67 |
| |
| static int s390_regmap_3264[] = { |
| PT_PSWMASK, PT_PSWADDR, |
| |
| PT_GPR0, PT_GPR0, PT_GPR1, PT_GPR1, PT_GPR2, PT_GPR2, PT_GPR3, PT_GPR3, |
| PT_GPR4, PT_GPR4, PT_GPR5, PT_GPR5, PT_GPR6, PT_GPR6, PT_GPR7, PT_GPR7, |
| PT_GPR8, PT_GPR8, PT_GPR9, PT_GPR9, PT_GPR10, PT_GPR10, PT_GPR11, PT_GPR11, |
| PT_GPR12, PT_GPR12, PT_GPR13, PT_GPR13, PT_GPR14, PT_GPR14, PT_GPR15, PT_GPR15, |
| |
| PT_ACR0, PT_ACR1, PT_ACR2, PT_ACR3, |
| PT_ACR4, PT_ACR5, PT_ACR6, PT_ACR7, |
| PT_ACR8, PT_ACR9, PT_ACR10, PT_ACR11, |
| PT_ACR12, PT_ACR13, PT_ACR14, PT_ACR15, |
| |
| PT_FPC, |
| |
| PT_FPR0, PT_FPR1, PT_FPR2, PT_FPR3, |
| PT_FPR4, PT_FPR5, PT_FPR6, PT_FPR7, |
| PT_FPR8, PT_FPR9, PT_FPR10, PT_FPR11, |
| PT_FPR12, PT_FPR13, PT_FPR14, PT_FPR15, |
| }; |
| #endif |
| |
| |
| static int |
| s390_cannot_fetch_register (int regno) |
| { |
| return 0; |
| } |
| |
| static int |
| s390_cannot_store_register (int regno) |
| { |
| return 0; |
| } |
| |
| static void |
| s390_collect_ptrace_register (struct regcache *regcache, int regno, char *buf) |
| { |
| int size = register_size (regno); |
| if (size < sizeof (long)) |
| { |
| int regaddr = the_low_target.regmap[regno]; |
| |
| memset (buf, 0, sizeof (long)); |
| |
| if ((regno ^ 1) < the_low_target.num_regs |
| && the_low_target.regmap[regno ^ 1] == regaddr) |
| { |
| collect_register (regcache, regno & ~1, buf); |
| collect_register (regcache, (regno & ~1) + 1, |
| buf + sizeof (long) - size); |
| } |
| else if (regaddr == PT_PSWADDR |
| || (regaddr >= PT_GPR0 && regaddr <= PT_GPR15)) |
| collect_register (regcache, regno, buf + sizeof (long) - size); |
| else |
| collect_register (regcache, regno, buf); |
| |
| /* When debugging a 32-bit inferior on a 64-bit host, make sure |
| the 31-bit addressing mode bit is set in the PSW mask. */ |
| if (regaddr == PT_PSWMASK) |
| buf[size] |= 0x80; |
| } |
| else |
| collect_register (regcache, regno, buf); |
| } |
| |
| static void |
| s390_supply_ptrace_register (struct regcache *regcache, int regno, const char *buf) |
| { |
| int size = register_size (regno); |
| if (size < sizeof (long)) |
| { |
| int regaddr = the_low_target.regmap[regno]; |
| |
| if ((regno ^ 1) < the_low_target.num_regs |
| && the_low_target.regmap[regno ^ 1] == regaddr) |
| { |
| supply_register (regcache, regno & ~1, buf); |
| supply_register (regcache, (regno & ~1) + 1, |
| buf + sizeof (long) - size); |
| } |
| else if (regaddr == PT_PSWADDR |
| || (regaddr >= PT_GPR0 && regaddr <= PT_GPR15)) |
| supply_register (regcache, regno, buf + sizeof (long) - size); |
| else |
| supply_register (regcache, regno, buf); |
| } |
| else |
| supply_register (regcache, regno, buf); |
| } |
| |
| /* Provide only a fill function for the general register set. ps_lgetregs |
| will use this for NPTL support. */ |
| |
| static void s390_fill_gregset (struct regcache *regcache, void *buf) |
| { |
| int i; |
| |
| for (i = 0; i < the_low_target.num_regs; i++) |
| { |
| if (the_low_target.regmap[i] < PT_PSWMASK |
| || the_low_target.regmap[i] > PT_ACR15) |
| continue; |
| |
| s390_collect_ptrace_register (regcache, i, (char *) buf |
| + the_low_target.regmap[i]); |
| } |
| } |
| |
| struct regset_info target_regsets[] = { |
| { 0, 0, 0, 0, GENERAL_REGS, s390_fill_gregset, NULL }, |
| { 0, 0, 0, -1, -1, NULL, NULL } |
| }; |
| |
| |
| static const unsigned char s390_breakpoint[] = { 0, 1 }; |
| #define s390_breakpoint_len 2 |
| |
| static CORE_ADDR |
| s390_get_pc (struct regcache *regcache) |
| { |
| if (register_size (0) == 4) |
| { |
| unsigned int pc; |
| collect_register_by_name (regcache, "pswa", &pc); |
| #ifndef __s390x__ |
| pc &= 0x7fffffff; |
| #endif |
| return pc; |
| } |
| else |
| { |
| unsigned long pc; |
| collect_register_by_name (regcache, "pswa", &pc); |
| return pc; |
| } |
| } |
| |
| static void |
| s390_set_pc (struct regcache *regcache, CORE_ADDR newpc) |
| { |
| if (register_size (0) == 4) |
| { |
| unsigned int pc = newpc; |
| #ifndef __s390x__ |
| pc |= 0x80000000; |
| #endif |
| supply_register_by_name (regcache, "pswa", &pc); |
| } |
| else |
| { |
| unsigned long pc = newpc; |
| supply_register_by_name (regcache, "pswa", &pc); |
| } |
| } |
| |
| #ifdef __s390x__ |
| static unsigned long |
| s390_get_hwcap (void) |
| { |
| int wordsize = register_size (0); |
| unsigned char *data = alloca (2 * wordsize); |
| int offset = 0; |
| |
| while ((*the_target->read_auxv) (offset, data, 2 * wordsize) == 2 * wordsize) |
| { |
| if (wordsize == 4) |
| { |
| unsigned int *data_p = (unsigned int *)data; |
| if (data_p[0] == AT_HWCAP) |
| return data_p[1]; |
| } |
| else |
| { |
| unsigned long *data_p = (unsigned long *)data; |
| if (data_p[0] == AT_HWCAP) |
| return data_p[1]; |
| } |
| |
| offset += 2 * wordsize; |
| } |
| |
| return 0; |
| } |
| #endif |
| |
| static void |
| s390_arch_setup (void) |
| { |
| /* Assume 31-bit inferior process. */ |
| init_registers_s390_linux32 (); |
| the_low_target.num_regs = s390_num_regs; |
| the_low_target.regmap = s390_regmap; |
| |
| /* On a 64-bit host, check the low bit of the (31-bit) PSWM |
| -- if this is one, we actually have a 64-bit inferior. */ |
| #ifdef __s390x__ |
| { |
| unsigned int pswm; |
| struct regcache *regcache = new_register_cache (); |
| fetch_inferior_registers (regcache, find_regno ("pswm")); |
| collect_register_by_name (regcache, "pswm", &pswm); |
| free_register_cache (regcache); |
| |
| if (pswm & 1) |
| init_registers_s390x_linux64 (); |
| |
| /* For a 31-bit inferior, check whether the kernel supports |
| using the full 64-bit GPRs. */ |
| else if (s390_get_hwcap () & HWCAP_S390_HIGH_GPRS) |
| { |
| init_registers_s390_linux64 (); |
| the_low_target.num_regs = s390_num_regs_3264; |
| the_low_target.regmap = s390_regmap_3264; |
| } |
| } |
| #endif |
| } |
| |
| |
| static int |
| s390_breakpoint_at (CORE_ADDR pc) |
| { |
| unsigned char c[s390_breakpoint_len]; |
| read_inferior_memory (pc, c, s390_breakpoint_len); |
| return memcmp (c, s390_breakpoint, s390_breakpoint_len) == 0; |
| } |
| |
| |
| struct linux_target_ops the_low_target = { |
| s390_arch_setup, |
| s390_num_regs, |
| s390_regmap, |
| s390_cannot_fetch_register, |
| s390_cannot_store_register, |
| s390_get_pc, |
| s390_set_pc, |
| s390_breakpoint, |
| s390_breakpoint_len, |
| NULL, |
| s390_breakpoint_len, |
| s390_breakpoint_at, |
| NULL, |
| NULL, |
| NULL, |
| NULL, |
| s390_collect_ptrace_register, |
| s390_supply_ptrace_register, |
| }; |