| /* GNU/Linux S/390 specific low level interface, for the remote server |
| for GDB. |
| Copyright (C) 2001-2002, 2005-2012 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 "elf/common.h" |
| |
| #include <asm/ptrace.h> |
| #include <sys/ptrace.h> |
| #include <sys/uio.h> |
| #include <elf.h> |
| |
| #ifndef HWCAP_S390_HIGH_GPRS |
| #define HWCAP_S390_HIGH_GPRS 512 |
| #endif |
| |
| #ifndef PTRACE_GETREGSET |
| #define PTRACE_GETREGSET 0x4204 |
| #endif |
| |
| #ifndef PTRACE_SETREGSET |
| #define PTRACE_SETREGSET 0x4205 |
| #endif |
| |
| /* Defined in auto-generated file s390-linux32.c. */ |
| void init_registers_s390_linux32 (void); |
| /* Defined in auto-generated file s390-linux32v1.c. */ |
| void init_registers_s390_linux32v1 (void); |
| /* Defined in auto-generated file s390-linux32v2.c. */ |
| void init_registers_s390_linux32v2 (void); |
| /* Defined in auto-generated file s390-linux64.c. */ |
| void init_registers_s390_linux64 (void); |
| /* Defined in auto-generated file s390-linux64v1.c. */ |
| void init_registers_s390_linux64v1 (void); |
| /* Defined in auto-generated file s390-linux64v2.c. */ |
| void init_registers_s390_linux64v2 (void); |
| /* Defined in auto-generated file s390x-linux64.c. */ |
| void init_registers_s390x_linux64 (void); |
| /* Defined in auto-generated file s390x-linux64v1.c. */ |
| void init_registers_s390x_linux64v1 (void); |
| /* Defined in auto-generated file s390x-linux64v2.c. */ |
| void init_registers_s390x_linux64v2 (void); |
| |
| #define s390_num_regs 52 |
| |
| 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 |
| |
| PT_ORIGGPR2, |
| }; |
| |
| #ifdef __s390x__ |
| #define s390_num_regs_3264 68 |
| |
| 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, |
| |
| PT_ORIGGPR2, |
| }; |
| #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_PSWMASK) |
| { |
| /* Convert 4-byte PSW mask to 8 bytes by clearing bit 12 and copying |
| the basic addressing mode bit from the PSW address. */ |
| char *addr = alloca (register_size (regno ^ 1)); |
| collect_register (regcache, regno, buf); |
| collect_register (regcache, regno ^ 1, addr); |
| buf[1] &= ~0x8; |
| buf[size] |= (addr[0] & 0x80); |
| } |
| else if (regaddr == PT_PSWADDR) |
| { |
| /* Convert 4-byte PSW address to 8 bytes by clearing the addressing |
| mode bit (which gets copied to the PSW mask instead). */ |
| collect_register (regcache, regno, buf + sizeof (long) - size); |
| buf[sizeof (long) - size] &= ~0x80; |
| } |
| else if ((regaddr >= PT_GPR0 && regaddr <= PT_GPR15) |
| || regaddr == PT_ORIGGPR2) |
| collect_register (regcache, regno, buf + sizeof (long) - size); |
| else |
| collect_register (regcache, regno, buf); |
| } |
| 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_PSWMASK) |
| { |
| /* Convert 8-byte PSW mask to 4 bytes by setting bit 12 and copying |
| the basic addressing mode into the PSW address. */ |
| char *mask = alloca (size); |
| char *addr = alloca (register_size (regno ^ 1)); |
| memcpy (mask, buf, size); |
| mask[1] |= 0x8; |
| supply_register (regcache, regno, mask); |
| |
| collect_register (regcache, regno ^ 1, addr); |
| addr[0] &= ~0x80; |
| addr[0] |= (buf[size] & 0x80); |
| supply_register (regcache, regno ^ 1, addr); |
| } |
| else if (regaddr == PT_PSWADDR) |
| { |
| /* Convert 8-byte PSW address to 4 bytes by truncating, but |
| keeping the addressing mode bit (which was set from the mask). */ |
| char *addr = alloca (size); |
| char amode; |
| collect_register (regcache, regno, addr); |
| amode = addr[0] & 0x80; |
| memcpy (addr, buf + sizeof (long) - size, size); |
| addr[0] &= ~0x80; |
| addr[0] |= amode; |
| supply_register (regcache, regno, addr); |
| } |
| else if ((regaddr >= PT_GPR0 && regaddr <= PT_GPR15) |
| || regaddr == PT_ORIGGPR2) |
| 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]); |
| } |
| } |
| |
| /* Fill and store functions for extended register sets. */ |
| |
| static void |
| s390_fill_last_break (struct regcache *regcache, void *buf) |
| { |
| /* Last break address is read-only. */ |
| } |
| |
| static void |
| s390_store_last_break (struct regcache *regcache, const void *buf) |
| { |
| supply_register_by_name (regcache, "last_break", |
| (const char *)buf + 8 - register_size (0)); |
| } |
| |
| static void |
| s390_fill_system_call (struct regcache *regcache, void *buf) |
| { |
| collect_register_by_name (regcache, "system_call", buf); |
| } |
| |
| static void |
| s390_store_system_call (struct regcache *regcache, const void *buf) |
| { |
| supply_register_by_name (regcache, "system_call", buf); |
| } |
| |
| struct regset_info target_regsets[] = { |
| { 0, 0, 0, 0, GENERAL_REGS, s390_fill_gregset, NULL }, |
| /* Last break address is read-only; do not attempt PTRACE_SETREGSET. */ |
| { PTRACE_GETREGSET, PTRACE_GETREGSET, NT_S390_LAST_BREAK, 0, |
| EXTENDED_REGS, s390_fill_last_break, s390_store_last_break }, |
| { PTRACE_GETREGSET, PTRACE_SETREGSET, NT_S390_SYSTEM_CALL, 0, |
| EXTENDED_REGS, s390_fill_system_call, s390_store_system_call }, |
| { 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 pswa; |
| collect_register_by_name (regcache, "pswa", &pswa); |
| return pswa & 0x7fffffff; |
| } |
| 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 pswa; |
| collect_register_by_name (regcache, "pswa", &pswa); |
| pswa = (pswa & 0x80000000) | (newpc & 0x7fffffff); |
| supply_register_by_name (regcache, "pswa", &pswa); |
| } |
| 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 int |
| s390_check_regset (int pid, int regset, int regsize) |
| { |
| gdb_byte *buf = alloca (regsize); |
| struct iovec iov; |
| |
| iov.iov_base = buf; |
| iov.iov_len = regsize; |
| |
| if (ptrace (PTRACE_GETREGSET, pid, (long) regset, (long) &iov) < 0) |
| return 0; |
| else |
| return 1; |
| } |
| |
| static void |
| s390_arch_setup (void) |
| { |
| struct regset_info *regset; |
| |
| /* Check whether the kernel supports extra register sets. */ |
| int pid = pid_of (get_thread_lwp (current_inferior)); |
| int have_regset_last_break |
| = s390_check_regset (pid, NT_S390_LAST_BREAK, 8); |
| int have_regset_system_call |
| = s390_check_regset (pid, NT_S390_SYSTEM_CALL, 4); |
| |
| /* Update target_regsets according to available register sets. */ |
| for (regset = target_regsets; regset->fill_function != NULL; regset++) |
| if (regset->get_request == PTRACE_GETREGSET) |
| switch (regset->nt_type) |
| { |
| case NT_S390_LAST_BREAK: |
| regset->size = have_regset_last_break? 8 : 0; |
| break; |
| case NT_S390_SYSTEM_CALL: |
| regset->size = have_regset_system_call? 4 : 0; |
| break; |
| default: |
| break; |
| } |
| |
| /* Assume 31-bit inferior process. */ |
| if (have_regset_system_call) |
| init_registers_s390_linux32v2 (); |
| else if (have_regset_last_break) |
| init_registers_s390_linux32v1 (); |
| else |
| 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) |
| { |
| if (have_regset_system_call) |
| init_registers_s390x_linux64v2 (); |
| else if (have_regset_last_break) |
| init_registers_s390x_linux64v1 (); |
| else |
| 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) |
| { |
| if (have_regset_system_call) |
| init_registers_s390_linux64v2 (); |
| else if (have_regset_last_break) |
| init_registers_s390_linux64v1 (); |
| else |
| 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, |
| NULL, |
| s390_cannot_fetch_register, |
| s390_cannot_store_register, |
| NULL, /* fetch_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, |
| }; |