| /* PPC GNU/Linux native support. |
| Copyright 1988, 1989, 1991, 1992, 1994, 1996, 2000, 2001, 2002 |
| 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 2 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, write to the Free Software |
| Foundation, Inc., 59 Temple Place - Suite 330, |
| Boston, MA 02111-1307, USA. */ |
| |
| #include "defs.h" |
| #include "frame.h" |
| #include "inferior.h" |
| #include "gdbcore.h" |
| #include "regcache.h" |
| |
| #include <sys/types.h> |
| #include <sys/param.h> |
| #include <signal.h> |
| #include <sys/user.h> |
| #include <sys/ioctl.h> |
| #include <sys/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" |
| |
| #ifndef PT_READ_U |
| #define PT_READ_U PTRACE_PEEKUSR |
| #endif |
| #ifndef PT_WRITE_U |
| #define PT_WRITE_U PTRACE_POKEUSR |
| #endif |
| |
| /* Default the type of the ptrace transfer to int. */ |
| #ifndef PTRACE_XFER_TYPE |
| #define PTRACE_XFER_TYPE int |
| #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 |
| |
| /* 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]; |
| |
| /* For runtime check of ptrace support for VRREGS. */ |
| int have_ptrace_getvrregs = 1; |
| |
| int |
| kernel_u_size (void) |
| { |
| return (sizeof (struct user)); |
| } |
| |
| /* *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 (int regno) |
| { |
| int u_addr = -1; |
| struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
| |
| /* General purpose registers occupy 1 slot each in the buffer */ |
| if (regno >= tdep->ppc_gp0_regnum && regno <= tdep->ppc_gplast_regnum ) |
| u_addr = ((PT_R0 + regno) * 4); |
| |
| /* Floating point regs: 2 slots each */ |
| if (regno >= FP0_REGNUM && regno <= FPLAST_REGNUM) |
| u_addr = ((PT_FPR0 + (regno - FP0_REGNUM) * 2) * 4); |
| |
| /* UISA special purpose registers: 1 slot each */ |
| if (regno == PC_REGNUM) |
| u_addr = PT_NIP * 4; |
| if (regno == tdep->ppc_lr_regnum) |
| u_addr = PT_LNK * 4; |
| if (regno == tdep->ppc_cr_regnum) |
| u_addr = PT_CCR * 4; |
| if (regno == tdep->ppc_xer_regnum) |
| u_addr = PT_XER * 4; |
| if (regno == tdep->ppc_ctr_regnum) |
| u_addr = PT_CTR * 4; |
| if (regno == tdep->ppc_mq_regnum) |
| u_addr = PT_MQ * 4; |
| if (regno == tdep->ppc_ps_regnum) |
| u_addr = PT_MSR * 4; |
| if (regno == tdep->ppc_fpscr_regnum) |
| u_addr = PT_FPSCR * 4; |
| |
| return u_addr; |
| } |
| |
| static int |
| ppc_ptrace_cannot_fetch_store_register (int regno) |
| { |
| return (ppc_register_u_addr (regno) == -1); |
| } |
| |
| /* 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 (int tid, int regno) |
| { |
| int ret; |
| int offset = 0; |
| gdb_vrregset_t regs; |
| struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
| int vrregsize = REGISTER_RAW_SIZE (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_RAW_SIZE (tdep->ppc_vrsave_regnum); |
| |
| supply_register (regno, |
| regs + (regno - tdep->ppc_vr0_regnum) * vrregsize + offset); |
| } |
| |
| static void |
| fetch_register (int tid, int regno) |
| { |
| /* This isn't really an address. But ptrace thinks of it as one. */ |
| char mess[128]; /* For messages */ |
| register int i; |
| unsigned int offset; /* Offset of registers within the u area. */ |
| char *buf = alloca (MAX_REGISTER_RAW_SIZE); |
| CORE_ADDR regaddr = ppc_register_u_addr (regno); |
| |
| if (altivec_register_p (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 (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 (regaddr == -1) |
| { |
| memset (buf, '\0', REGISTER_RAW_SIZE (regno)); /* Supply zeroes */ |
| supply_register (regno, buf); |
| return; |
| } |
| |
| for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (PTRACE_XFER_TYPE)) |
| { |
| errno = 0; |
| *(PTRACE_XFER_TYPE *) & buf[i] = ptrace (PT_READ_U, tid, |
| (PTRACE_ARG3_TYPE) regaddr, 0); |
| regaddr += sizeof (PTRACE_XFER_TYPE); |
| if (errno != 0) |
| { |
| sprintf (mess, "reading register %s (#%d)", |
| REGISTER_NAME (regno), regno); |
| perror_with_name (mess); |
| } |
| } |
| supply_register (regno, buf); |
| } |
| |
| static void |
| supply_vrregset (gdb_vrregset_t *vrregsetp) |
| { |
| int i; |
| struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
| int num_of_vrregs = tdep->ppc_vrsave_regnum - tdep->ppc_vr0_regnum + 1; |
| int vrregsize = REGISTER_RAW_SIZE (tdep->ppc_vr0_regnum); |
| int offset = vrregsize - REGISTER_RAW_SIZE (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)) |
| supply_register (tdep->ppc_vr0_regnum + i, |
| *vrregsetp + i * vrregsize + offset); |
| else |
| supply_register (tdep->ppc_vr0_regnum + i, *vrregsetp + i * vrregsize); |
| } |
| } |
| |
| static void |
| fetch_altivec_registers (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 (®s); |
| } |
| |
| static void |
| fetch_ppc_registers (int tid) |
| { |
| int i; |
| struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
| |
| for (i = 0; i <= tdep->ppc_fpscr_regnum; i++) |
| fetch_register (tid, i); |
| if (tdep->ppc_mq_regnum != -1) |
| fetch_register (tid, tdep->ppc_mq_regnum); |
| if (have_ptrace_getvrregs) |
| if (tdep->ppc_vr0_regnum != -1 && tdep->ppc_vrsave_regnum != -1) |
| fetch_altivec_registers (tid); |
| } |
| |
| /* 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. */ |
| void |
| fetch_inferior_registers (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 (tid); |
| else |
| fetch_register (tid, regno); |
| } |
| |
| /* Store one register. */ |
| static void |
| store_altivec_register (int tid, int regno) |
| { |
| int ret; |
| int offset = 0; |
| gdb_vrregset_t regs; |
| struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
| int vrregsize = REGISTER_RAW_SIZE (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_RAW_SIZE (tdep->ppc_vrsave_regnum); |
| |
| regcache_collect (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"); |
| } |
| |
| static void |
| store_register (int tid, int regno) |
| { |
| /* This isn't really an address. But ptrace thinks of it as one. */ |
| CORE_ADDR regaddr = ppc_register_u_addr (regno); |
| char mess[128]; /* For messages */ |
| register int i; |
| unsigned int offset; /* Offset of registers within the u area. */ |
| char *buf = alloca (MAX_REGISTER_RAW_SIZE); |
| |
| if (altivec_register_p (regno)) |
| { |
| store_altivec_register (tid, regno); |
| return; |
| } |
| |
| if (regaddr == -1) |
| return; |
| |
| regcache_collect (regno, buf); |
| for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (PTRACE_XFER_TYPE)) |
| { |
| errno = 0; |
| ptrace (PT_WRITE_U, tid, (PTRACE_ARG3_TYPE) regaddr, |
| *(PTRACE_XFER_TYPE *) & buf[i]); |
| regaddr += sizeof (PTRACE_XFER_TYPE); |
| |
| if (errno == EIO |
| && regno == gdbarch_tdep (current_gdbarch)->ppc_fpscr_regnum) |
| { |
| /* Some older kernel versions don't allow fpscr to be written. */ |
| continue; |
| } |
| |
| if (errno != 0) |
| { |
| sprintf (mess, "writing register %s (#%d)", |
| REGISTER_NAME (regno), regno); |
| perror_with_name (mess); |
| } |
| } |
| } |
| |
| static void |
| fill_vrregset (gdb_vrregset_t *vrregsetp) |
| { |
| int i; |
| struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
| int num_of_vrregs = tdep->ppc_vrsave_regnum - tdep->ppc_vr0_regnum + 1; |
| int vrregsize = REGISTER_RAW_SIZE (tdep->ppc_vr0_regnum); |
| int offset = vrregsize - REGISTER_RAW_SIZE (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_collect (tdep->ppc_vr0_regnum + i, |
| *vrregsetp + i * vrregsize + offset); |
| else |
| regcache_collect (tdep->ppc_vr0_regnum + i, *vrregsetp + i * vrregsize); |
| } |
| } |
| |
| static void |
| store_altivec_registers (int tid) |
| { |
| int ret; |
| gdb_vrregset_t regs; |
| |
| ret = ptrace (PTRACE_GETVRREGS, tid, 0, (int) ®s); |
| if (ret < 0) |
| { |
| if (errno == EIO) |
| { |
| have_ptrace_getvrregs = 0; |
| return; |
| } |
| perror_with_name ("Couldn't get AltiVec registers"); |
| } |
| |
| fill_vrregset (®s); |
| |
| if (ptrace (PTRACE_SETVRREGS, tid, 0, (int) ®s) < 0) |
| perror_with_name ("Couldn't write AltiVec registers"); |
| } |
| |
| static void |
| store_ppc_registers (int tid) |
| { |
| int i; |
| struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
| |
| for (i = 0; i <= tdep->ppc_fpscr_regnum; i++) |
| store_register (tid, i); |
| if (tdep->ppc_mq_regnum != -1) |
| store_register (tid, tdep->ppc_mq_regnum); |
| if (have_ptrace_getvrregs) |
| if (tdep->ppc_vr0_regnum != -1 && tdep->ppc_vrsave_regnum != -1) |
| store_altivec_registers (tid); |
| } |
| |
| void |
| store_inferior_registers (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 (tid, regno); |
| else |
| store_ppc_registers (tid); |
| } |
| |
| void |
| supply_gregset (gdb_gregset_t *gregsetp) |
| { |
| ppc_linux_supply_gregset ((char *) gregsetp); |
| } |
| |
| void |
| fill_gregset (gdb_gregset_t *gregsetp, int regno) |
| { |
| int regi; |
| elf_greg_t *regp = (elf_greg_t *) gregsetp; |
| struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
| |
| for (regi = 0; regi < 32; regi++) |
| { |
| if ((regno == -1) || regno == regi) |
| regcache_collect (regi, regp + PT_R0 + regi); |
| } |
| |
| if ((regno == -1) || regno == PC_REGNUM) |
| regcache_collect (PC_REGNUM, regp + PT_NIP); |
| if ((regno == -1) || regno == tdep->ppc_lr_regnum) |
| regcache_collect (tdep->ppc_lr_regnum, regp + PT_LNK); |
| if ((regno == -1) || regno == tdep->ppc_cr_regnum) |
| regcache_collect (tdep->ppc_cr_regnum, regp + PT_CCR); |
| if ((regno == -1) || regno == tdep->ppc_xer_regnum) |
| regcache_collect (tdep->ppc_xer_regnum, regp + PT_XER); |
| if ((regno == -1) || regno == tdep->ppc_ctr_regnum) |
| regcache_collect (tdep->ppc_ctr_regnum, regp + PT_CTR); |
| if (((regno == -1) || regno == tdep->ppc_mq_regnum) |
| && (tdep->ppc_mq_regnum != -1)) |
| regcache_collect (tdep->ppc_mq_regnum, regp + PT_MQ); |
| if ((regno == -1) || regno == tdep->ppc_ps_regnum) |
| regcache_collect (tdep->ppc_ps_regnum, regp + PT_MSR); |
| } |
| |
| void |
| supply_fpregset (gdb_fpregset_t * fpregsetp) |
| { |
| ppc_linux_supply_fpregset ((char *) fpregsetp); |
| } |
| |
| /* Given a pointer to a floating point register set in /proc format |
| (fpregset_t *), update the register specified by REGNO from gdb's |
| idea of the current floating point register set. If REGNO is -1, |
| update them all. */ |
| void |
| fill_fpregset (gdb_fpregset_t *fpregsetp, int regno) |
| { |
| int regi; |
| struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
| |
| for (regi = 0; regi < 32; regi++) |
| { |
| if ((regno == -1) || (regno == FP0_REGNUM + regi)) |
| regcache_collect (FP0_REGNUM + regi, (char *) (*fpregsetp + regi)); |
| } |
| if ((regno == -1) || regno == tdep->ppc_fpscr_regnum) |
| regcache_collect (tdep->ppc_fpscr_regnum, (char *) (*fpregsetp + regi)); |
| } |