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/* PPC GNU/Linux native support. Copyright (C) 1988, 1989, 1991, 1992, 1994, 1996, 2000, 2001, 2002, 2003, 2004, 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/>. */ #include "defs.h" #include "gdb_string.h" #include "frame.h" #include "inferior.h" #include "gdbcore.h" #include "regcache.h" #include "gdb_assert.h" #include "target.h" #include "linux-nat.h" #include <stdint.h> #include <sys/types.h> #include <sys/param.h> #include <signal.h> #include <sys/user.h> #include <sys/ioctl.h> #include "gdb_wait.h" #include <fcntl.h> #include <sys/procfs.h> #include <sys/ptrace.h> /* Prototypes for supply_gregset etc. */ #include "gregset.h" #include "ppc-tdep.h" #include "ppc-linux-tdep.h" /* Required when using the AUXV. */ #include "elf/common.h" #include "auxv.h" /* This sometimes isn't defined. */ #ifndef PT_ORIG_R3 #define PT_ORIG_R3 34 #endif #ifndef PT_TRAP #define PT_TRAP 40 #endif /* The PPC_FEATURE_* defines should be provided by <asm/cputable.h>. If they aren't, we can provide them ourselves (their values are fixed because they are part of the kernel ABI). They are used in the AT_HWCAP entry of the AUXV. */ #ifndef PPC_FEATURE_CELL #define PPC_FEATURE_CELL 0x00010000 #endif #ifndef PPC_FEATURE_BOOKE #define PPC_FEATURE_BOOKE 0x00008000 #endif #ifndef PPC_FEATURE_HAS_DFP #define PPC_FEATURE_HAS_DFP 0x00000400 /* Decimal Floating Point. */ #endif /* Glibc's headers don't define PTRACE_GETVRREGS so we cannot use a configure time check. Some older glibc's (for instance 2.2.1) don't have a specific powerpc version of ptrace.h, and fall back on a generic one. In such cases, sys/ptrace.h defines PTRACE_GETFPXREGS and PTRACE_SETFPXREGS to the same numbers that ppc kernel's asm/ptrace.h defines PTRACE_GETVRREGS and PTRACE_SETVRREGS to be. This also makes a configury check pretty much useless. */ /* These definitions should really come from the glibc header files, but Glibc doesn't know about the vrregs yet. */ #ifndef PTRACE_GETVRREGS #define PTRACE_GETVRREGS 18 #define PTRACE_SETVRREGS 19 #endif /* PTRACE requests for POWER7 VSX registers. */ #ifndef PTRACE_GETVSXREGS #define PTRACE_GETVSXREGS 27 #define PTRACE_SETVSXREGS 28 #endif /* Similarly for the ptrace requests for getting / setting the SPE registers (ev0 -- ev31, acc, and spefscr). See the description of gdb_evrregset_t for details. */ #ifndef PTRACE_GETEVRREGS #define PTRACE_GETEVRREGS 20 #define PTRACE_SETEVRREGS 21 #endif /* Similarly for the hardware watchpoint support. */ #ifndef PTRACE_GET_DEBUGREG #define PTRACE_GET_DEBUGREG 25 #endif #ifndef PTRACE_SET_DEBUGREG #define PTRACE_SET_DEBUGREG 26 #endif #ifndef PTRACE_GETSIGINFO #define PTRACE_GETSIGINFO 0x4202 #endif /* Similarly for the general-purpose (gp0 -- gp31) and floating-point registers (fp0 -- fp31). */ #ifndef PTRACE_GETREGS #define PTRACE_GETREGS 12 #endif #ifndef PTRACE_SETREGS #define PTRACE_SETREGS 13 #endif #ifndef PTRACE_GETFPREGS #define PTRACE_GETFPREGS 14 #endif #ifndef PTRACE_SETFPREGS #define PTRACE_SETFPREGS 15 #endif /* This oddity is because the Linux kernel defines elf_vrregset_t as an array of 33 16 bytes long elements. I.e. it leaves out vrsave. However the PTRACE_GETVRREGS and PTRACE_SETVRREGS requests return the vrsave as an extra 4 bytes at the end. I opted for creating a flat array of chars, so that it is easier to manipulate for gdb. There are 32 vector registers 16 bytes longs, plus a VSCR register which is only 4 bytes long, but is fetched as a 16 bytes quantity. Up to here we have the elf_vrregset_t structure. Appended to this there is space for the VRSAVE register: 4 bytes. Even though this vrsave register is not included in the regset typedef, it is handled by the ptrace requests. Note that GNU/Linux doesn't support little endian PPC hardware, therefore the offset at which the real value of the VSCR register is located will be always 12 bytes. The layout is like this (where x is the actual value of the vscr reg): */ /* *INDENT-OFF* */ /* |.|.|.|.|.....|.|.|.|.||.|.|.|x||.| <-------> <-------><-------><-> VR0 VR31 VSCR VRSAVE */ /* *INDENT-ON* */ #define SIZEOF_VRREGS 33*16+4 typedef char gdb_vrregset_t[SIZEOF_VRREGS]; /* This is the layout of the POWER7 VSX registers and the way they overlap with the existing FPR and VMX registers. VSR doubleword 0 VSR doubleword 1 ---------------------------------------------------------------- VSR[0] | FPR[0] | | ---------------------------------------------------------------- VSR[1] | FPR[1] | | ---------------------------------------------------------------- | ... | | | ... | | ---------------------------------------------------------------- VSR[30] | FPR[30] | | ---------------------------------------------------------------- VSR[31] | FPR[31] | | ---------------------------------------------------------------- VSR[32] | VR[0] | ---------------------------------------------------------------- VSR[33] | VR[1] | ---------------------------------------------------------------- | ... | | ... | ---------------------------------------------------------------- VSR[62] | VR[30] | ---------------------------------------------------------------- VSR[63] | VR[31] | ---------------------------------------------------------------- VSX has 64 128bit registers. The first 32 registers overlap with the FP registers (doubleword 0) and hence extend them with additional 64 bits (doubleword 1). The other 32 regs overlap with the VMX registers. */ #define SIZEOF_VSXREGS 32*8 typedef char gdb_vsxregset_t[SIZEOF_VSXREGS]; /* On PPC processors that support the the Signal Processing Extension (SPE) APU, the general-purpose registers are 64 bits long. However, the ordinary Linux kernel PTRACE_PEEKUSER / PTRACE_POKEUSER ptrace calls only access the lower half of each register, to allow them to behave the same way they do on non-SPE systems. There's a separate pair of calls, PTRACE_GETEVRREGS / PTRACE_SETEVRREGS, that read and write the top halves of all the general-purpose registers at once, along with some SPE-specific registers. GDB itself continues to claim the general-purpose registers are 32 bits long. It has unnamed raw registers that hold the upper halves of the gprs, and the the full 64-bit SIMD views of the registers, 'ev0' -- 'ev31', are pseudo-registers that splice the top and bottom halves together. This is the structure filled in by PTRACE_GETEVRREGS and written to the inferior's registers by PTRACE_SETEVRREGS. */ struct gdb_evrregset_t { unsigned long evr[32]; unsigned long long acc; unsigned long spefscr; }; /* Non-zero if our kernel may support the PTRACE_GETVSXREGS and PTRACE_SETVSXREGS requests, for reading and writing the VSX POWER7 registers 0 through 31. Zero if we've tried one of them and gotten an error. Note that VSX registers 32 through 63 overlap with VR registers 0 through 31. */ int have_ptrace_getsetvsxregs = 1; /* Non-zero if our kernel may support the PTRACE_GETVRREGS and PTRACE_SETVRREGS requests, for reading and writing the Altivec registers. Zero if we've tried one of them and gotten an error. */ int have_ptrace_getvrregs = 1; /* Non-zero if our kernel may support the PTRACE_GETEVRREGS and PTRACE_SETEVRREGS requests, for reading and writing the SPE registers. Zero if we've tried one of them and gotten an error. */ int have_ptrace_getsetevrregs = 1; /* Non-zero if our kernel may support the PTRACE_GETREGS and PTRACE_SETREGS requests, for reading and writing the general-purpose registers. Zero if we've tried one of them and gotten an error. */ int have_ptrace_getsetregs = 1; /* Non-zero if our kernel may support the PTRACE_GETFPREGS and PTRACE_SETFPREGS requests, for reading and writing the floating-pointers registers. Zero if we've tried one of them and gotten an error. */ int have_ptrace_getsetfpregs = 1; /* *INDENT-OFF* */ /* registers layout, as presented by the ptrace interface: PT_R0, PT_R1, PT_R2, PT_R3, PT_R4, PT_R5, PT_R6, PT_R7, PT_R8, PT_R9, PT_R10, PT_R11, PT_R12, PT_R13, PT_R14, PT_R15, PT_R16, PT_R17, PT_R18, PT_R19, PT_R20, PT_R21, PT_R22, PT_R23, PT_R24, PT_R25, PT_R26, PT_R27, PT_R28, PT_R29, PT_R30, PT_R31, PT_FPR0, PT_FPR0 + 2, PT_FPR0 + 4, PT_FPR0 + 6, PT_FPR0 + 8, PT_FPR0 + 10, PT_FPR0 + 12, PT_FPR0 + 14, PT_FPR0 + 16, PT_FPR0 + 18, PT_FPR0 + 20, PT_FPR0 + 22, PT_FPR0 + 24, PT_FPR0 + 26, PT_FPR0 + 28, PT_FPR0 + 30, PT_FPR0 + 32, PT_FPR0 + 34, PT_FPR0 + 36, PT_FPR0 + 38, PT_FPR0 + 40, PT_FPR0 + 42, PT_FPR0 + 44, PT_FPR0 + 46, PT_FPR0 + 48, PT_FPR0 + 50, PT_FPR0 + 52, PT_FPR0 + 54, PT_FPR0 + 56, PT_FPR0 + 58, PT_FPR0 + 60, PT_FPR0 + 62, PT_NIP, PT_MSR, PT_CCR, PT_LNK, PT_CTR, PT_XER, PT_MQ */ /* *INDENT_ON * */ static int ppc_register_u_addr (struct gdbarch *gdbarch, int regno) { int u_addr = -1; struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); /* NOTE: cagney/2003-11-25: This is the word size used by the ptrace interface, and not the wordsize of the program's ABI. */ int wordsize = sizeof (long); /* General purpose registers occupy 1 slot each in the buffer */ if (regno >= tdep->ppc_gp0_regnum && regno < tdep->ppc_gp0_regnum + ppc_num_gprs) u_addr = ((regno - tdep->ppc_gp0_regnum + PT_R0) * wordsize); /* Floating point regs: eight bytes each in both 32- and 64-bit ptrace interfaces. Thus, two slots each in 32-bit interface, one slot each in 64-bit interface. */ if (tdep->ppc_fp0_regnum >= 0 && regno >= tdep->ppc_fp0_regnum && regno < tdep->ppc_fp0_regnum + ppc_num_fprs) u_addr = (PT_FPR0 * wordsize) + ((regno - tdep->ppc_fp0_regnum) * 8); /* UISA special purpose registers: 1 slot each */ if (regno == gdbarch_pc_regnum (gdbarch)) u_addr = PT_NIP * wordsize; if (regno == tdep->ppc_lr_regnum) u_addr = PT_LNK * wordsize; if (regno == tdep->ppc_cr_regnum) u_addr = PT_CCR * wordsize; if (regno == tdep->ppc_xer_regnum) u_addr = PT_XER * wordsize; if (regno == tdep->ppc_ctr_regnum) u_addr = PT_CTR * wordsize; #ifdef PT_MQ if (regno == tdep->ppc_mq_regnum) u_addr = PT_MQ * wordsize; #endif if (regno == tdep->ppc_ps_regnum) u_addr = PT_MSR * wordsize; if (regno == PPC_ORIG_R3_REGNUM) u_addr = PT_ORIG_R3 * wordsize; if (regno == PPC_TRAP_REGNUM) u_addr = PT_TRAP * wordsize; if (tdep->ppc_fpscr_regnum >= 0 && regno == tdep->ppc_fpscr_regnum) { /* NOTE: cagney/2005-02-08: On some 64-bit GNU/Linux systems the kernel headers incorrectly contained the 32-bit definition of PT_FPSCR. For the 32-bit definition, floating-point registers occupy two 32-bit "slots", and the FPSCR lives in the second half of such a slot-pair (hence +1). For 64-bit, the FPSCR instead occupies the full 64-bit 2-word-slot and hence no adjustment is necessary. Hack around this. */ if (wordsize == 8 && PT_FPSCR == (48 + 32 + 1)) u_addr = (48 + 32) * wordsize; /* If the FPSCR is 64-bit wide, we need to fetch the whole 64-bit slot and not just its second word. The PT_FPSCR supplied when GDB is compiled as a 32-bit app doesn't reflect this. */ else if (wordsize == 4 && register_size (gdbarch, regno) == 8 && PT_FPSCR == (48 + 2*32 + 1)) u_addr = (48 + 2*32) * wordsize; else u_addr = PT_FPSCR * wordsize; } return u_addr; } /* The Linux kernel ptrace interface for POWER7 VSX registers uses the registers set mechanism, as opposed to the interface for all the other registers, that stores/fetches each register individually. */ static void fetch_vsx_register (struct regcache *regcache, int tid, int regno) { int ret; gdb_vsxregset_t regs; struct gdbarch *gdbarch = get_regcache_arch (regcache); struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); int vsxregsize = register_size (gdbarch, tdep->ppc_vsr0_upper_regnum); ret = ptrace (PTRACE_GETVSXREGS, tid, 0, ®s); if (ret < 0) { if (errno == EIO) { have_ptrace_getsetvsxregs = 0; return; } perror_with_name (_("Unable to fetch VSX register")); } regcache_raw_supply (regcache, regno, regs + (regno - tdep->ppc_vsr0_upper_regnum) * vsxregsize); } /* The Linux kernel ptrace interface for AltiVec registers uses the registers set mechanism, as opposed to the interface for all the other registers, that stores/fetches each register individually. */ static void fetch_altivec_register (struct regcache *regcache, int tid, int regno) { int ret; int offset = 0; gdb_vrregset_t regs; struct gdbarch *gdbarch = get_regcache_arch (regcache); struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); int vrregsize = register_size (gdbarch, tdep->ppc_vr0_regnum); ret = ptrace (PTRACE_GETVRREGS, tid, 0, ®s); if (ret < 0) { if (errno == EIO) { have_ptrace_getvrregs = 0; return; } perror_with_name (_("Unable to fetch AltiVec register")); } /* VSCR is fetched as a 16 bytes quantity, but it is really 4 bytes long on the hardware. We deal only with the lower 4 bytes of the vector. VRSAVE is at the end of the array in a 4 bytes slot, so there is no need to define an offset for it. */ if (regno == (tdep->ppc_vrsave_regnum - 1)) offset = vrregsize - register_size (gdbarch, tdep->ppc_vrsave_regnum); regcache_raw_supply (regcache, regno, regs + (regno - tdep->ppc_vr0_regnum) * vrregsize + offset); } /* Fetch the top 32 bits of TID's general-purpose registers and the SPE-specific registers, and place the results in EVRREGSET. If we don't support PTRACE_GETEVRREGS, then just fill EVRREGSET with zeros. All the logic to deal with whether or not the PTRACE_GETEVRREGS and PTRACE_SETEVRREGS requests are supported is isolated here, and in set_spe_registers. */ static void get_spe_registers (int tid, struct gdb_evrregset_t *evrregset) { if (have_ptrace_getsetevrregs) { if (ptrace (PTRACE_GETEVRREGS, tid, 0, evrregset) >= 0) return; else { /* EIO means that the PTRACE_GETEVRREGS request isn't supported; we just return zeros. */ if (errno == EIO) have_ptrace_getsetevrregs = 0; else /* Anything else needs to be reported. */ perror_with_name (_("Unable to fetch SPE registers")); } } memset (evrregset, 0, sizeof (*evrregset)); } /* Supply values from TID for SPE-specific raw registers: the upper halves of the GPRs, the accumulator, and the spefscr. REGNO must be the number of an upper half register, acc, spefscr, or -1 to supply the values of all registers. */ static void fetch_spe_register (struct regcache *regcache, int tid, int regno) { struct gdbarch *gdbarch = get_regcache_arch (regcache); struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); struct gdb_evrregset_t evrregs; gdb_assert (sizeof (evrregs.evr[0]) == register_size (gdbarch, tdep->ppc_ev0_upper_regnum)); gdb_assert (sizeof (evrregs.acc) == register_size (gdbarch, tdep->ppc_acc_regnum)); gdb_assert (sizeof (evrregs.spefscr) == register_size (gdbarch, tdep->ppc_spefscr_regnum)); get_spe_registers (tid, &evrregs); if (regno == -1) { int i; for (i = 0; i < ppc_num_gprs; i++) regcache_raw_supply (regcache, tdep->ppc_ev0_upper_regnum + i, &evrregs.evr[i]); } else if (tdep->ppc_ev0_upper_regnum <= regno && regno < tdep->ppc_ev0_upper_regnum + ppc_num_gprs) regcache_raw_supply (regcache, regno, &evrregs.evr[regno - tdep->ppc_ev0_upper_regnum]); if (regno == -1 || regno == tdep->ppc_acc_regnum) regcache_raw_supply (regcache, tdep->ppc_acc_regnum, &evrregs.acc); if (regno == -1 || regno == tdep->ppc_spefscr_regnum) regcache_raw_supply (regcache, tdep->ppc_spefscr_regnum, &evrregs.spefscr); } static void fetch_register (struct regcache *regcache, int tid, int regno) { struct gdbarch *gdbarch = get_regcache_arch (regcache); struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); /* This isn't really an address. But ptrace thinks of it as one. */ CORE_ADDR regaddr = ppc_register_u_addr (gdbarch, regno); int bytes_transferred; unsigned int offset; /* Offset of registers within the u area. */ char buf[MAX_REGISTER_SIZE]; if (altivec_register_p (gdbarch, regno)) { /* If this is the first time through, or if it is not the first time through, and we have comfirmed that there is kernel support for such a ptrace request, then go and fetch the register. */ if (have_ptrace_getvrregs) { fetch_altivec_register (regcache, tid, regno); return; } /* If we have discovered that there is no ptrace support for AltiVec registers, fall through and return zeroes, because regaddr will be -1 in this case. */ } if (vsx_register_p (gdbarch, regno)) { if (have_ptrace_getsetvsxregs) { fetch_vsx_register (regcache, tid, regno); return; } } else if (spe_register_p (gdbarch, regno)) { fetch_spe_register (regcache, tid, regno); return; } if (regaddr == -1) { memset (buf, '\0', register_size (gdbarch, regno)); /* Supply zeroes */ regcache_raw_supply (regcache, regno, buf); return; } /* Read the raw register using sizeof(long) sized chunks. On a 32-bit platform, 64-bit floating-point registers will require two transfers. */ for (bytes_transferred = 0; bytes_transferred < register_size (gdbarch, regno); bytes_transferred += sizeof (long)) { errno = 0; *(long *) &buf[bytes_transferred] = ptrace (PTRACE_PEEKUSER, tid, (PTRACE_TYPE_ARG3) regaddr, 0); regaddr += sizeof (long); if (errno != 0) { char message[128]; sprintf (message, "reading register %s (#%d)", gdbarch_register_name (gdbarch, regno), regno); perror_with_name (message); } } /* Now supply the register. Keep in mind that the regcache's idea of the register's size may not be a multiple of sizeof (long). */ if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_LITTLE) { /* Little-endian values are always found at the left end of the bytes transferred. */ regcache_raw_supply (regcache, regno, buf); } else if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG) { /* Big-endian values are found at the right end of the bytes transferred. */ size_t padding = (bytes_transferred - register_size (gdbarch, regno)); regcache_raw_supply (regcache, regno, buf + padding); } else internal_error (__FILE__, __LINE__, _("fetch_register: unexpected byte order: %d"), gdbarch_byte_order (gdbarch)); } static void supply_vsxregset (struct regcache *regcache, gdb_vsxregset_t *vsxregsetp) { int i; struct gdbarch *gdbarch = get_regcache_arch (regcache); struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); int vsxregsize = register_size (gdbarch, tdep->ppc_vsr0_upper_regnum); for (i = 0; i < ppc_num_vshrs; i++) { regcache_raw_supply (regcache, tdep->ppc_vsr0_upper_regnum + i, *vsxregsetp + i * vsxregsize); } } static void supply_vrregset (struct regcache *regcache, gdb_vrregset_t *vrregsetp) { int i; struct gdbarch *gdbarch = get_regcache_arch (regcache); struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); int num_of_vrregs = tdep->ppc_vrsave_regnum - tdep->ppc_vr0_regnum + 1; int vrregsize = register_size (gdbarch, tdep->ppc_vr0_regnum); int offset = vrregsize - register_size (gdbarch, tdep->ppc_vrsave_regnum); for (i = 0; i < num_of_vrregs; i++) { /* The last 2 registers of this set are only 32 bit long, not 128. However an offset is necessary only for VSCR because it occupies a whole vector, while VRSAVE occupies a full 4 bytes slot. */ if (i == (num_of_vrregs - 2)) regcache_raw_supply (regcache, tdep->ppc_vr0_regnum + i, *vrregsetp + i * vrregsize + offset); else regcache_raw_supply (regcache, tdep->ppc_vr0_regnum + i, *vrregsetp + i * vrregsize); } } static void fetch_vsx_registers (struct regcache *regcache, int tid) { int ret; gdb_vsxregset_t regs; ret = ptrace (PTRACE_GETVSXREGS, tid, 0, ®s); if (ret < 0) { if (errno == EIO) { have_ptrace_getsetvsxregs = 0; return; } perror_with_name (_("Unable to fetch VSX registers")); } supply_vsxregset (regcache, ®s); } static void fetch_altivec_registers (struct regcache *regcache, int tid) { int ret; gdb_vrregset_t regs; ret = ptrace (PTRACE_GETVRREGS, tid, 0, ®s); if (ret < 0) { if (errno == EIO) { have_ptrace_getvrregs = 0; return; } perror_with_name (_("Unable to fetch AltiVec registers")); } supply_vrregset (regcache, ®s); } /* This function actually issues the request to ptrace, telling it to get all general-purpose registers and put them into the specified regset. If the ptrace request does not exist, this function returns 0 and properly sets the have_ptrace_* flag. If the request fails, this function calls perror_with_name. Otherwise, if the request succeeds, then the regcache gets filled and 1 is returned. */ static int fetch_all_gp_regs (struct regcache *regcache, int tid) { struct gdbarch *gdbarch = get_regcache_arch (regcache); struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); gdb_gregset_t gregset; if (ptrace (PTRACE_GETREGS, tid, 0, (void *) &gregset) < 0) { if (errno == EIO) { have_ptrace_getsetregs = 0; return 0; } perror_with_name (_("Couldn't get general-purpose registers.")); } supply_gregset (regcache, (const gdb_gregset_t *) &gregset); return 1; } /* This is a wrapper for the fetch_all_gp_regs function. It is responsible for verifying if this target has the ptrace request that can be used to fetch all general-purpose registers at one shot. If it doesn't, then we should fetch them using the old-fashioned way, which is to iterate over the registers and request them one by one. */ static void fetch_gp_regs (struct regcache *regcache, int tid) { struct gdbarch *gdbarch = get_regcache_arch (regcache); struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); int i; if (have_ptrace_getsetregs) if (fetch_all_gp_regs (regcache, tid)) return; /* If we've hit this point, it doesn't really matter which architecture we are using. We just need to read the registers in the "old-fashioned way". */ for (i = 0; i < ppc_num_gprs; i++) fetch_register (regcache, tid, tdep->ppc_gp0_regnum + i); } /* This function actually issues the request to ptrace, telling it to get all floating-point registers and put them into the specified regset. If the ptrace request does not exist, this function returns 0 and properly sets the have_ptrace_* flag. If the request fails, this function calls perror_with_name. Otherwise, if the request succeeds, then the regcache gets filled and 1 is returned. */ static int fetch_all_fp_regs (struct regcache *regcache, int tid) { gdb_fpregset_t fpregs; if (ptrace (PTRACE_GETFPREGS, tid, 0, (void *) &fpregs) < 0) { if (errno == EIO) { have_ptrace_getsetfpregs = 0; return 0; } perror_with_name (_("Couldn't get floating-point registers.")); } supply_fpregset (regcache, (const gdb_fpregset_t *) &fpregs); return 1; } /* This is a wrapper for the fetch_all_fp_regs function. It is responsible for verifying if this target has the ptrace request that can be used to fetch all floating-point registers at one shot. If it doesn't, then we should fetch them using the old-fashioned way, which is to iterate over the registers and request them one by one. */ static void fetch_fp_regs (struct regcache *regcache, int tid) { struct gdbarch *gdbarch = get_regcache_arch (regcache); struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); int i; if (have_ptrace_getsetfpregs) if (fetch_all_fp_regs (regcache, tid)) return; /* If we've hit this point, it doesn't really matter which architecture we are using. We just need to read the registers in the "old-fashioned way". */ for (i = 0; i < ppc_num_fprs; i++) fetch_register (regcache, tid, tdep->ppc_fp0_regnum + i); } static void fetch_ppc_registers (struct regcache *regcache, int tid) { int i; struct gdbarch *gdbarch = get_regcache_arch (regcache); struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); fetch_gp_regs (regcache, tid); if (tdep->ppc_fp0_regnum >= 0) fetch_fp_regs (regcache, tid); fetch_register (regcache, tid, gdbarch_pc_regnum (gdbarch)); if (tdep->ppc_ps_regnum != -1) fetch_register (regcache, tid, tdep->ppc_ps_regnum); if (tdep->ppc_cr_regnum != -1) fetch_register (regcache, tid, tdep->ppc_cr_regnum); if (tdep->ppc_lr_regnum != -1) fetch_register (regcache, tid, tdep->ppc_lr_regnum); if (tdep->ppc_ctr_regnum != -1) fetch_register (regcache, tid, tdep->ppc_ctr_regnum); if (tdep->ppc_xer_regnum != -1) fetch_register (regcache, tid, tdep->ppc_xer_regnum); if (tdep->ppc_mq_regnum != -1) fetch_register (regcache, tid, tdep->ppc_mq_regnum); if (ppc_linux_trap_reg_p (gdbarch)) { fetch_register (regcache, tid, PPC_ORIG_R3_REGNUM); fetch_register (regcache, tid, PPC_TRAP_REGNUM); } if (tdep->ppc_fpscr_regnum != -1) fetch_register (regcache, tid, tdep->ppc_fpscr_regnum); if (have_ptrace_getvrregs) if (tdep->ppc_vr0_regnum != -1 && tdep->ppc_vrsave_regnum != -1) fetch_altivec_registers (regcache, tid); if (have_ptrace_getsetvsxregs) if (tdep->ppc_vsr0_upper_regnum != -1) fetch_vsx_registers (regcache, tid); if (tdep->ppc_ev0_upper_regnum >= 0) fetch_spe_register (regcache, tid, -1); } /* Fetch registers from the child process. Fetch all registers if regno == -1, otherwise fetch all general registers or all floating point registers depending upon the value of regno. */ static void ppc_linux_fetch_inferior_registers (struct target_ops *ops, struct regcache *regcache, int regno) { /* Overload thread id onto process id */ int tid = TIDGET (inferior_ptid); /* No thread id, just use process id */ if (tid == 0) tid = PIDGET (inferior_ptid); if (regno == -1) fetch_ppc_registers (regcache, tid); else fetch_register (regcache, tid, regno); } /* Store one VSX register. */ static void store_vsx_register (const struct regcache *regcache, int tid, int regno) { int ret; gdb_vsxregset_t regs; struct gdbarch *gdbarch = get_regcache_arch (regcache); struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); int vsxregsize = register_size (gdbarch, tdep->ppc_vsr0_upper_regnum); ret = ptrace (PTRACE_SETVSXREGS, tid, 0, ®s); if (ret < 0) { if (errno == EIO) { have_ptrace_getsetvsxregs = 0; return; } perror_with_name (_("Unable to fetch VSX register")); } regcache_raw_collect (regcache, regno, regs + (regno - tdep->ppc_vsr0_upper_regnum) * vsxregsize); ret = ptrace (PTRACE_SETVSXREGS, tid, 0, ®s); if (ret < 0) perror_with_name (_("Unable to store VSX register")); } /* Store one register. */ static void store_altivec_register (const struct regcache *regcache, int tid, int regno) { int ret; int offset = 0; gdb_vrregset_t regs; struct gdbarch *gdbarch = get_regcache_arch (regcache); struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); int vrregsize = register_size (gdbarch, tdep->ppc_vr0_regnum); ret = ptrace (PTRACE_GETVRREGS, tid, 0, ®s); if (ret < 0) { if (errno == EIO) { have_ptrace_getvrregs = 0; return; } perror_with_name (_("Unable to fetch AltiVec register")); } /* VSCR is fetched as a 16 bytes quantity, but it is really 4 bytes long on the hardware. */ if (regno == (tdep->ppc_vrsave_regnum - 1)) offset = vrregsize - register_size (gdbarch, tdep->ppc_vrsave_regnum); regcache_raw_collect (regcache, regno, regs + (regno - tdep->ppc_vr0_regnum) * vrregsize + offset); ret = ptrace (PTRACE_SETVRREGS, tid, 0, ®s); if (ret < 0) perror_with_name (_("Unable to store AltiVec register")); } /* Assuming TID referrs to an SPE process, set the top halves of TID's general-purpose registers and its SPE-specific registers to the values in EVRREGSET. If we don't support PTRACE_SETEVRREGS, do nothing. All the logic to deal with whether or not the PTRACE_GETEVRREGS and PTRACE_SETEVRREGS requests are supported is isolated here, and in get_spe_registers. */ static void set_spe_registers (int tid, struct gdb_evrregset_t *evrregset) { if (have_ptrace_getsetevrregs) { if (ptrace (PTRACE_SETEVRREGS, tid, 0, evrregset) >= 0) return; else { /* EIO means that the PTRACE_SETEVRREGS request isn't supported; we fail silently, and don't try the call again. */ if (errno == EIO) have_ptrace_getsetevrregs = 0; else /* Anything else needs to be reported. */ perror_with_name (_("Unable to set SPE registers")); } } } /* Write GDB's value for the SPE-specific raw register REGNO to TID. If REGNO is -1, write the values of all the SPE-specific registers. */ static void store_spe_register (const struct regcache *regcache, int tid, int regno) { struct gdbarch *gdbarch = get_regcache_arch (regcache); struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); struct gdb_evrregset_t evrregs; gdb_assert (sizeof (evrregs.evr[0]) == register_size (gdbarch, tdep->ppc_ev0_upper_regnum)); gdb_assert (sizeof (evrregs.acc) == register_size (gdbarch, tdep->ppc_acc_regnum)); gdb_assert (sizeof (evrregs.spefscr) == register_size (gdbarch, tdep->ppc_spefscr_regnum)); if (regno == -1) /* Since we're going to write out every register, the code below should store to every field of evrregs; if that doesn't happen, make it obvious by initializing it with suspicious values. */ memset (&evrregs, 42, sizeof (evrregs)); else /* We can only read and write the entire EVR register set at a time, so to write just a single register, we do a read-modify-write maneuver. */ get_spe_registers (tid, &evrregs); if (regno == -1) { int i; for (i = 0; i < ppc_num_gprs; i++) regcache_raw_collect (regcache, tdep->ppc_ev0_upper_regnum + i, &evrregs.evr[i]); } else if (tdep->ppc_ev0_upper_regnum <= regno && regno < tdep->ppc_ev0_upper_regnum + ppc_num_gprs) regcache_raw_collect (regcache, regno, &evrregs.evr[regno - tdep->ppc_ev0_upper_regnum]); if (regno == -1 || regno == tdep->ppc_acc_regnum) regcache_raw_collect (regcache, tdep->ppc_acc_regnum, &evrregs.acc); if (regno == -1 || regno == tdep->ppc_spefscr_regnum) regcache_raw_collect (regcache, tdep->ppc_spefscr_regnum, &evrregs.spefscr); /* Write back the modified register set. */ set_spe_registers (tid, &evrregs); } static void store_register (const struct regcache *regcache, int tid, int regno) { struct gdbarch *gdbarch = get_regcache_arch (regcache); struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); /* This isn't really an address. But ptrace thinks of it as one. */ CORE_ADDR regaddr = ppc_register_u_addr (gdbarch, regno); int i; size_t bytes_to_transfer; char buf[MAX_REGISTER_SIZE]; if (altivec_register_p (gdbarch, regno)) { store_altivec_register (regcache, tid, regno); return; } if (vsx_register_p (gdbarch, regno)) { store_vsx_register (regcache, tid, regno); return; } else if (spe_register_p (gdbarch, regno)) { store_spe_register (regcache, tid, regno); return; } if (regaddr == -1) return; /* First collect the register. Keep in mind that the regcache's idea of the register's size may not be a multiple of sizeof (long). */ memset (buf, 0, sizeof buf); bytes_to_transfer = align_up (register_size (gdbarch, regno), sizeof (long)); if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_LITTLE) { /* Little-endian values always sit at the left end of the buffer. */ regcache_raw_collect (regcache, regno, buf); } else if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG) { /* Big-endian values sit at the right end of the buffer. */ size_t padding = (bytes_to_transfer - register_size (gdbarch, regno)); regcache_raw_collect (regcache, regno, buf + padding); } for (i = 0; i < bytes_to_transfer; i += sizeof (long)) { errno = 0; ptrace (PTRACE_POKEUSER, tid, (PTRACE_TYPE_ARG3) regaddr, *(long *) &buf[i]); regaddr += sizeof (long); if (errno == EIO && (regno == tdep->ppc_fpscr_regnum || regno == PPC_ORIG_R3_REGNUM || regno == PPC_TRAP_REGNUM)) { /* Some older kernel versions don't allow fpscr, orig_r3 or trap to be written. */ continue; } if (errno != 0) { char message[128]; sprintf (message, "writing register %s (#%d)", gdbarch_register_name (gdbarch, regno), regno); perror_with_name (message); } } } static void fill_vsxregset (const struct regcache *regcache, gdb_vsxregset_t *vsxregsetp) { int i; struct gdbarch *gdbarch = get_regcache_arch (regcache); struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); int vsxregsize = register_size (gdbarch, tdep->ppc_vsr0_upper_regnum); for (i = 0; i < ppc_num_vshrs; i++) regcache_raw_collect (regcache, tdep->ppc_vsr0_upper_regnum + i, *vsxregsetp + i * vsxregsize); } static void fill_vrregset (const struct regcache *regcache, gdb_vrregset_t *vrregsetp) { int i; struct gdbarch *gdbarch = get_regcache_arch (regcache); struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); int num_of_vrregs = tdep->ppc_vrsave_regnum - tdep->ppc_vr0_regnum + 1; int vrregsize = register_size (gdbarch, tdep->ppc_vr0_regnum); int offset = vrregsize - register_size (gdbarch, tdep->ppc_vrsave_regnum); for (i = 0; i < num_of_vrregs; i++) { /* The last 2 registers of this set are only 32 bit long, not 128, but only VSCR is fetched as a 16 bytes quantity. */ if (i == (num_of_vrregs - 2)) regcache_raw_collect (regcache, tdep->ppc_vr0_regnum + i, *vrregsetp + i * vrregsize + offset); else regcache_raw_collect (regcache, tdep->ppc_vr0_regnum + i, *vrregsetp + i * vrregsize); } } static void store_vsx_registers (const struct regcache *regcache, int tid) { int ret; gdb_vsxregset_t regs; ret = ptrace (PTRACE_GETVSXREGS, tid, 0, ®s); if (ret < 0) { if (errno == EIO) { have_ptrace_getsetvsxregs = 0; return; } perror_with_name (_("Couldn't get VSX registers")); } fill_vsxregset (regcache, ®s); if (ptrace (PTRACE_SETVSXREGS, tid, 0, ®s) < 0) perror_with_name (_("Couldn't write VSX registers")); } static void store_altivec_registers (const struct regcache *regcache, int tid) { int ret; gdb_vrregset_t regs; ret = ptrace (PTRACE_GETVRREGS, tid, 0, ®s); if (ret < 0) { if (errno == EIO) { have_ptrace_getvrregs = 0; return; } perror_with_name (_("Couldn't get AltiVec registers")); } fill_vrregset (regcache, ®s); if (ptrace (PTRACE_SETVRREGS, tid, 0, ®s) < 0) perror_with_name (_("Couldn't write AltiVec registers")); } /* This function actually issues the request to ptrace, telling it to store all general-purpose registers present in the specified regset. If the ptrace request does not exist, this function returns 0 and properly sets the have_ptrace_* flag. If the request fails, this function calls perror_with_name. Otherwise, if the request succeeds, then the regcache is stored and 1 is returned. */ static int store_all_gp_regs (const struct regcache *regcache, int tid, int regno) { struct gdbarch *gdbarch = get_regcache_arch (regcache); struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); gdb_gregset_t gregset; if (ptrace (PTRACE_GETREGS, tid, 0, (void *) &gregset) < 0) { if (errno == EIO) { have_ptrace_getsetregs = 0; return 0; } perror_with_name (_("Couldn't get general-purpose registers.")); } fill_gregset (regcache, &gregset, regno); if (ptrace (PTRACE_SETREGS, tid, 0, (void *) &gregset) < 0) { if (errno == EIO) { have_ptrace_getsetregs = 0; return 0; } perror_with_name (_("Couldn't set general-purpose registers.")); } return 1; } /* This is a wrapper for the store_all_gp_regs function. It is responsible for verifying if this target has the ptrace request that can be used to store all general-purpose registers at one shot. If it doesn't, then we should store them using the old-fashioned way, which is to iterate over the registers and store them one by one. */ static void store_gp_regs (const struct regcache *regcache, int tid, int regno) { struct gdbarch *gdbarch = get_regcache_arch (regcache); struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); int i; if (have_ptrace_getsetregs) if (store_all_gp_regs (regcache, tid, regno)) return; /* If we hit this point, it doesn't really matter which architecture we are using. We just need to store the registers in the "old-fashioned way". */ for (i = 0; i < ppc_num_gprs; i++) store_register (regcache, tid, tdep->ppc_gp0_regnum + i); } /* This function actually issues the request to ptrace, telling it to store all floating-point registers present in the specified regset. If the ptrace request does not exist, this function returns 0 and properly sets the have_ptrace_* flag. If the request fails, this function calls perror_with_name. Otherwise, if the request succeeds, then the regcache is stored and 1 is returned. */ static int store_all_fp_regs (const struct regcache *regcache, int tid, int regno) { gdb_fpregset_t fpregs; if (ptrace (PTRACE_GETFPREGS, tid, 0, (void *) &fpregs) < 0) { if (errno == EIO) { have_ptrace_getsetfpregs = 0; return 0; } perror_with_name (_("Couldn't get floating-point registers.")); } fill_fpregset (regcache, &fpregs, regno); if (ptrace (PTRACE_SETFPREGS, tid, 0, (void *) &fpregs) < 0) { if (errno == EIO) { have_ptrace_getsetfpregs = 0; return 0; } perror_with_name (_("Couldn't set floating-point registers.")); } return 1; } /* This is a wrapper for the store_all_fp_regs function. It is responsible for verifying if this target has the ptrace request that can be used to store all floating-point registers at one shot. If it doesn't, then we should store them using the old-fashioned way, which is to iterate over the registers and store them one by one. */ static void store_fp_regs (const struct regcache *regcache, int tid, int regno) { struct gdbarch *gdbarch = get_regcache_arch (regcache); struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); int i; if (have_ptrace_getsetfpregs) if (store_all_fp_regs (regcache, tid, regno)) return; /* If we hit this point, it doesn't really matter which architecture we are using. We just need to store the registers in the "old-fashioned way". */ for (i = 0; i < ppc_num_fprs; i++) store_register (regcache, tid, tdep->ppc_fp0_regnum + i); } static void store_ppc_registers (const struct regcache *regcache, int tid) { int i; struct gdbarch *gdbarch = get_regcache_arch (regcache); struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); store_gp_regs (regcache, tid, -1); if (tdep->ppc_fp0_regnum >= 0) store_fp_regs (regcache, tid, -1); store_register (regcache, tid, gdbarch_pc_regnum (gdbarch)); if (tdep->ppc_ps_regnum != -1) store_register (regcache, tid, tdep->ppc_ps_regnum); if (tdep->ppc_cr_regnum != -1) store_register (regcache, tid, tdep->ppc_cr_regnum); if (tdep->ppc_lr_regnum != -1) store_register (regcache, tid, tdep->ppc_lr_regnum); if (tdep->ppc_ctr_regnum != -1) store_register (regcache, tid, tdep->ppc_ctr_regnum); if (tdep->ppc_xer_regnum != -1) store_register (regcache, tid, tdep->ppc_xer_regnum); if (tdep->ppc_mq_regnum != -1) store_register (regcache, tid, tdep->ppc_mq_regnum); if (tdep->ppc_fpscr_regnum != -1) store_register (regcache, tid, tdep->ppc_fpscr_regnum); if (ppc_linux_trap_reg_p (gdbarch)) { store_register (regcache, tid, PPC_ORIG_R3_REGNUM); store_register (regcache, tid, PPC_TRAP_REGNUM); } if (have_ptrace_getvrregs) if (tdep->ppc_vr0_regnum != -1 && tdep->ppc_vrsave_regnum != -1) store_altivec_registers (regcache, tid); if (have_ptrace_getsetvsxregs) if (tdep->ppc_vsr0_upper_regnum != -1) store_vsx_registers (regcache, tid); if (tdep->ppc_ev0_upper_regnum >= 0) store_spe_register (regcache, tid, -1); } static int ppc_linux_check_watch_resources (int type, int cnt, int ot) { int tid; ptid_t ptid = inferior_ptid; /* DABR (data address breakpoint register) is optional for PPC variants. Some variants have one DABR, others have none. So CNT can't be larger than 1. */ if (cnt > 1) return 0; /* We need to know whether ptrace supports PTRACE_SET_DEBUGREG and whether the target has DABR. If either answer is no, the ptrace call will return -1. Fail in that case. */ tid = TIDGET (ptid); if (tid == 0) tid = PIDGET (ptid); if (ptrace (PTRACE_SET_DEBUGREG, tid, 0, 0) == -1) return 0; return 1; } /* Fetch the AT_HWCAP entry from the aux vector. */ unsigned long ppc_linux_get_hwcap (void) { CORE_ADDR field; if (target_auxv_search (¤t_target, AT_HWCAP, &field)) return (unsigned long) field; return 0; } static int ppc_linux_region_ok_for_hw_watchpoint (CORE_ADDR addr, int len) { /* Handle sub-8-byte quantities. */ if (len <= 0) return 0; /* addr+len must fall in the 8 byte watchable region for DABR-based processors. DAC-based processors, like the PowerPC 440, will use addresses aligned to 4-bytes due to the way the read/write flags are passed at the moment. */ if (((ppc_linux_get_hwcap () & PPC_FEATURE_BOOKE) && (addr + len) > (addr & ~3) + 4) || (addr + len) > (addr & ~7) + 8) return 0; return 1; } /* The cached DABR value, to install in new threads. */ static long saved_dabr_value; /* Set a watchpoint of type TYPE at address ADDR. */ static int ppc_linux_insert_watchpoint (CORE_ADDR addr, int len, int rw) { struct lwp_info *lp; ptid_t ptid; long dabr_value; long read_mode, write_mode; if (ppc_linux_get_hwcap () & PPC_FEATURE_BOOKE) { /* PowerPC 440 requires only the read/write flags to be passed to the kernel. */ read_mode = 1; write_mode = 2; } else { /* PowerPC 970 and other DABR-based processors are required to pass the Breakpoint Translation bit together with the flags. */ read_mode = 5; write_mode = 6; } dabr_value = addr & ~(read_mode | write_mode); switch (rw) { case hw_read: /* Set read and translate bits. */ dabr_value |= read_mode; break; case hw_write: /* Set write and translate bits. */ dabr_value |= write_mode; break; case hw_access: /* Set read, write and translate bits. */ dabr_value |= read_mode | write_mode; break; } saved_dabr_value = dabr_value; ALL_LWPS (lp, ptid) if (ptrace (PTRACE_SET_DEBUGREG, TIDGET (ptid), 0, saved_dabr_value) < 0) return -1; return 0; } static int ppc_linux_remove_watchpoint (CORE_ADDR addr, int len, int rw) { struct lwp_info *lp; ptid_t ptid; long dabr_value = 0; saved_dabr_value = 0; ALL_LWPS (lp, ptid) if (ptrace (PTRACE_SET_DEBUGREG, TIDGET (ptid), 0, saved_dabr_value) < 0) return -1; return 0; } static void ppc_linux_new_thread (ptid_t ptid) { ptrace (PTRACE_SET_DEBUGREG, TIDGET (ptid), 0, saved_dabr_value); } static int ppc_linux_stopped_data_address (struct target_ops *target, CORE_ADDR *addr_p) { struct siginfo *siginfo_p; siginfo_p = linux_nat_get_siginfo (inferior_ptid); if (siginfo_p->si_signo != SIGTRAP || (siginfo_p->si_code & 0xffff) != 0x0004 /* TRAP_HWBKPT */) return 0; *addr_p = (CORE_ADDR) (uintptr_t) siginfo_p->si_addr; return 1; } static int ppc_linux_stopped_by_watchpoint (void) { CORE_ADDR addr; return ppc_linux_stopped_data_address (¤t_target, &addr); } static int ppc_linux_watchpoint_addr_within_range (struct target_ops *target, CORE_ADDR addr, CORE_ADDR start, int length) { int mask; if (ppc_linux_get_hwcap () & PPC_FEATURE_BOOKE) mask = 3; else mask = 7; addr &= ~mask; /* Check whether [start, start+length-1] intersects [addr, addr+mask]. */ return start <= addr + mask && start + length - 1 >= addr; } static void ppc_linux_store_inferior_registers (struct target_ops *ops, struct regcache *regcache, int regno) { /* Overload thread id onto process id */ int tid = TIDGET (inferior_ptid); /* No thread id, just use process id */ if (tid == 0) tid = PIDGET (inferior_ptid); if (regno >= 0) store_register (regcache, tid, regno); else store_ppc_registers (regcache, tid); } /* Functions for transferring registers between a gregset_t or fpregset_t (see sys/ucontext.h) and gdb's regcache. The word size is that used by the ptrace interface, not the current program's ABI. eg. If a powerpc64-linux gdb is being used to debug a powerpc32-linux app, we read or write 64-bit gregsets. This is to suit the host libthread_db. */ void supply_gregset (struct regcache *regcache, const gdb_gregset_t *gregsetp) { const struct regset *regset = ppc_linux_gregset (sizeof (long)); ppc_supply_gregset (regset, regcache, -1, gregsetp, sizeof (*gregsetp)); } void fill_gregset (const struct regcache *regcache, gdb_gregset_t *gregsetp, int regno) { const struct regset *regset = ppc_linux_gregset (sizeof (long)); if (regno == -1) memset (gregsetp, 0, sizeof (*gregsetp)); ppc_collect_gregset (regset, regcache, regno, gregsetp, sizeof (*gregsetp)); } void supply_fpregset (struct regcache *regcache, const gdb_fpregset_t * fpregsetp) { const struct regset *regset = ppc_linux_fpregset (); ppc_supply_fpregset (regset, regcache, -1, fpregsetp, sizeof (*fpregsetp)); } void fill_fpregset (const struct regcache *regcache, gdb_fpregset_t *fpregsetp, int regno) { const struct regset *regset = ppc_linux_fpregset (); ppc_collect_fpregset (regset, regcache, regno, fpregsetp, sizeof (*fpregsetp)); } static int ppc_linux_target_wordsize (void) { int wordsize = 4; /* Check for 64-bit inferior process. This is the case when the host is 64-bit, and in addition the top bit of the MSR register is set. */ #ifdef __powerpc64__ long msr; int tid = TIDGET (inferior_ptid); if (tid == 0) tid = PIDGET (inferior_ptid); errno = 0; msr = (long) ptrace (PTRACE_PEEKUSER, tid, PT_MSR * 8, 0); if (errno == 0 && msr < 0) wordsize = 8; #endif return wordsize; } static int ppc_linux_auxv_parse (struct target_ops *ops, gdb_byte **readptr, gdb_byte *endptr, CORE_ADDR *typep, CORE_ADDR *valp) { int sizeof_auxv_field = ppc_linux_target_wordsize (); enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch); gdb_byte *ptr = *readptr; if (endptr == ptr) return 0; if (endptr - ptr < sizeof_auxv_field * 2) return -1; *typep = extract_unsigned_integer (ptr, sizeof_auxv_field, byte_order); ptr += sizeof_auxv_field; *valp = extract_unsigned_integer (ptr, sizeof_auxv_field, byte_order); ptr += sizeof_auxv_field; *readptr = ptr; return 1; } static const struct target_desc * ppc_linux_read_description (struct target_ops *ops) { int altivec = 0; int vsx = 0; int isa205 = 0; int cell = 0; int tid = TIDGET (inferior_ptid); if (tid == 0) tid = PIDGET (inferior_ptid); if (have_ptrace_getsetevrregs) { struct gdb_evrregset_t evrregset; if (ptrace (PTRACE_GETEVRREGS, tid, 0, &evrregset) >= 0) return tdesc_powerpc_e500l; /* EIO means that the PTRACE_GETEVRREGS request isn't supported. Anything else needs to be reported. */ else if (errno != EIO) perror_with_name (_("Unable to fetch SPE registers")); } if (have_ptrace_getsetvsxregs) { gdb_vsxregset_t vsxregset; if (ptrace (PTRACE_GETVSXREGS, tid, 0, &vsxregset) >= 0) vsx = 1; /* EIO means that the PTRACE_GETVSXREGS request isn't supported. Anything else needs to be reported. */ else if (errno != EIO) perror_with_name (_("Unable to fetch VSX registers")); } if (have_ptrace_getvrregs) { gdb_vrregset_t vrregset; if (ptrace (PTRACE_GETVRREGS, tid, 0, &vrregset) >= 0) altivec = 1; /* EIO means that the PTRACE_GETVRREGS request isn't supported. Anything else needs to be reported. */ else if (errno != EIO) perror_with_name (_("Unable to fetch AltiVec registers")); } /* Power ISA 2.05 (implemented by Power 6 and newer processors) increases the FPSCR from 32 bits to 64 bits. Even though Power 7 supports this ISA version, it doesn't have PPC_FEATURE_ARCH_2_05 set, only PPC_FEATURE_ARCH_2_06. Since for now the only bits used in the higher half of the register are for Decimal Floating Point, we check if that feature is available to decide the size of the FPSCR. */ if (ppc_linux_get_hwcap () & PPC_FEATURE_HAS_DFP) isa205 = 1; if (ppc_linux_get_hwcap () & PPC_FEATURE_CELL) cell = 1; if (ppc_linux_target_wordsize () == 8) { if (cell) return tdesc_powerpc_cell64l; else if (vsx) return isa205? tdesc_powerpc_isa205_vsx64l : tdesc_powerpc_vsx64l; else if (altivec) return isa205? tdesc_powerpc_isa205_altivec64l : tdesc_powerpc_altivec64l; return isa205? tdesc_powerpc_isa205_64l : tdesc_powerpc_64l; } if (cell) return tdesc_powerpc_cell32l; else if (vsx) return isa205? tdesc_powerpc_isa205_vsx32l : tdesc_powerpc_vsx32l; else if (altivec) return isa205? tdesc_powerpc_isa205_altivec32l : tdesc_powerpc_altivec32l; return isa205? tdesc_powerpc_isa205_32l : tdesc_powerpc_32l; } void _initialize_ppc_linux_nat (void); void _initialize_ppc_linux_nat (void) { struct target_ops *t; /* Fill in the generic GNU/Linux methods. */ t = linux_target (); /* Add our register access methods. */ t->to_fetch_registers = ppc_linux_fetch_inferior_registers; t->to_store_registers = ppc_linux_store_inferior_registers; /* Add our watchpoint methods. */ t->to_can_use_hw_breakpoint = ppc_linux_check_watch_resources; t->to_region_ok_for_hw_watchpoint = ppc_linux_region_ok_for_hw_watchpoint; t->to_insert_watchpoint = ppc_linux_insert_watchpoint; t->to_remove_watchpoint = ppc_linux_remove_watchpoint; t->to_stopped_by_watchpoint = ppc_linux_stopped_by_watchpoint; t->to_stopped_data_address = ppc_linux_stopped_data_address; t->to_watchpoint_addr_within_range = ppc_linux_watchpoint_addr_within_range; t->to_read_description = ppc_linux_read_description; t->to_auxv_parse = ppc_linux_auxv_parse; /* Register the target. */ linux_nat_add_target (t); linux_nat_set_new_thread (t, ppc_linux_new_thread); }
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