| /* Target-dependent code for PowerPC systems running NetBSD. |
| |
| Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc. |
| |
| Contributed by Wasabi Systems, 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., 51 Franklin Street, Fifth Floor, |
| Boston, MA 02110-1301, USA. */ |
| |
| #include "defs.h" |
| #include "gdbcore.h" |
| #include "regcache.h" |
| #include "target.h" |
| #include "breakpoint.h" |
| #include "value.h" |
| #include "osabi.h" |
| |
| #include "ppc-tdep.h" |
| #include "ppcnbsd-tdep.h" |
| #include "nbsd-tdep.h" |
| #include "tramp-frame.h" |
| #include "trad-frame.h" |
| #include "gdb_assert.h" |
| #include "solib-svr4.h" |
| |
| #define REG_FIXREG_OFFSET(x) ((x) * 4) |
| #define REG_LR_OFFSET (32 * 4) |
| #define REG_CR_OFFSET (33 * 4) |
| #define REG_XER_OFFSET (34 * 4) |
| #define REG_CTR_OFFSET (35 * 4) |
| #define REG_PC_OFFSET (36 * 4) |
| #define SIZEOF_STRUCT_REG (37 * 4) |
| |
| #define FPREG_FPR_OFFSET(x) ((x) * 8) |
| #define FPREG_FPSCR_OFFSET (32 * 8) |
| #define SIZEOF_STRUCT_FPREG (33 * 8) |
| |
| void |
| ppcnbsd_supply_reg (char *regs, int regno) |
| { |
| struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
| int i; |
| |
| for (i = 0; i < ppc_num_gprs; i++) |
| { |
| if (regno == tdep->ppc_gp0_regnum + i || regno == -1) |
| regcache_raw_supply (current_regcache, tdep->ppc_gp0_regnum + i, |
| regs + REG_FIXREG_OFFSET (i)); |
| } |
| |
| if (regno == tdep->ppc_lr_regnum || regno == -1) |
| regcache_raw_supply (current_regcache, tdep->ppc_lr_regnum, |
| regs + REG_LR_OFFSET); |
| |
| if (regno == tdep->ppc_cr_regnum || regno == -1) |
| regcache_raw_supply (current_regcache, tdep->ppc_cr_regnum, |
| regs + REG_CR_OFFSET); |
| |
| if (regno == tdep->ppc_xer_regnum || regno == -1) |
| regcache_raw_supply (current_regcache, tdep->ppc_xer_regnum, |
| regs + REG_XER_OFFSET); |
| |
| if (regno == tdep->ppc_ctr_regnum || regno == -1) |
| regcache_raw_supply (current_regcache, tdep->ppc_ctr_regnum, |
| regs + REG_CTR_OFFSET); |
| |
| if (regno == PC_REGNUM || regno == -1) |
| regcache_raw_supply (current_regcache, PC_REGNUM, |
| regs + REG_PC_OFFSET); |
| } |
| |
| void |
| ppcnbsd_fill_reg (char *regs, int regno) |
| { |
| struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
| int i; |
| |
| for (i = 0; i < ppc_num_gprs; i++) |
| { |
| if (regno == tdep->ppc_gp0_regnum + i || regno == -1) |
| regcache_raw_collect (current_regcache, tdep->ppc_gp0_regnum + i, |
| regs + REG_FIXREG_OFFSET (i)); |
| } |
| |
| if (regno == tdep->ppc_lr_regnum || regno == -1) |
| regcache_raw_collect (current_regcache, tdep->ppc_lr_regnum, |
| regs + REG_LR_OFFSET); |
| |
| if (regno == tdep->ppc_cr_regnum || regno == -1) |
| regcache_raw_collect (current_regcache, tdep->ppc_cr_regnum, |
| regs + REG_CR_OFFSET); |
| |
| if (regno == tdep->ppc_xer_regnum || regno == -1) |
| regcache_raw_collect (current_regcache, tdep->ppc_xer_regnum, |
| regs + REG_XER_OFFSET); |
| |
| if (regno == tdep->ppc_ctr_regnum || regno == -1) |
| regcache_raw_collect (current_regcache, tdep->ppc_ctr_regnum, |
| regs + REG_CTR_OFFSET); |
| |
| if (regno == PC_REGNUM || regno == -1) |
| regcache_raw_collect (current_regcache, PC_REGNUM, regs + REG_PC_OFFSET); |
| } |
| |
| void |
| ppcnbsd_supply_fpreg (char *fpregs, int regno) |
| { |
| struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
| int i; |
| |
| /* FIXME: jimb/2004-05-05: Some PPC variants don't have floating |
| point registers. Traditionally, GDB's register set has still |
| listed the floating point registers for such machines, so this |
| code is harmless. However, the new E500 port actually omits the |
| floating point registers entirely from the register set --- they |
| don't even have register numbers assigned to them. |
| |
| It's not clear to me how best to update this code, so this assert |
| will alert the first person to encounter the NetBSD/E500 |
| combination to the problem. */ |
| gdb_assert (ppc_floating_point_unit_p (current_gdbarch)); |
| |
| for (i = 0; i < ppc_num_fprs; i++) |
| { |
| if (regno == tdep->ppc_fp0_regnum + i || regno == -1) |
| regcache_raw_supply (current_regcache, tdep->ppc_fp0_regnum + i, |
| fpregs + FPREG_FPR_OFFSET (i)); |
| } |
| |
| if (regno == tdep->ppc_fpscr_regnum || regno == -1) |
| regcache_raw_supply (current_regcache, tdep->ppc_fpscr_regnum, |
| fpregs + FPREG_FPSCR_OFFSET); |
| } |
| |
| void |
| ppcnbsd_fill_fpreg (char *fpregs, int regno) |
| { |
| struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
| int i; |
| |
| /* FIXME: jimb/2004-05-05: Some PPC variants don't have floating |
| point registers. Traditionally, GDB's register set has still |
| listed the floating point registers for such machines, so this |
| code is harmless. However, the new E500 port actually omits the |
| floating point registers entirely from the register set --- they |
| don't even have register numbers assigned to them. |
| |
| It's not clear to me how best to update this code, so this assert |
| will alert the first person to encounter the NetBSD/E500 |
| combination to the problem. */ |
| gdb_assert (ppc_floating_point_unit_p (current_gdbarch)); |
| |
| for (i = 0; i < ppc_num_fprs; i++) |
| { |
| if (regno == tdep->ppc_fp0_regnum + i || regno == -1) |
| regcache_raw_collect (current_regcache, tdep->ppc_fp0_regnum + i, |
| fpregs + FPREG_FPR_OFFSET (i)); |
| } |
| |
| if (regno == tdep->ppc_fpscr_regnum || regno == -1) |
| regcache_raw_collect (current_regcache, tdep->ppc_fpscr_regnum, |
| fpregs + FPREG_FPSCR_OFFSET); |
| } |
| |
| static void |
| fetch_core_registers (char *core_reg_sect, unsigned core_reg_size, int which, |
| CORE_ADDR ignore) |
| { |
| char *regs, *fpregs; |
| |
| /* We get everything from one section. */ |
| if (which != 0) |
| return; |
| |
| regs = core_reg_sect; |
| fpregs = core_reg_sect + SIZEOF_STRUCT_REG; |
| |
| /* Integer registers. */ |
| ppcnbsd_supply_reg (regs, -1); |
| |
| /* Floating point registers. */ |
| ppcnbsd_supply_fpreg (fpregs, -1); |
| } |
| |
| static void |
| fetch_elfcore_registers (char *core_reg_sect, unsigned core_reg_size, int which, |
| CORE_ADDR ignore) |
| { |
| switch (which) |
| { |
| case 0: /* Integer registers. */ |
| if (core_reg_size != SIZEOF_STRUCT_REG) |
| warning (_("Wrong size register set in core file.")); |
| else |
| ppcnbsd_supply_reg (core_reg_sect, -1); |
| break; |
| |
| case 2: /* Floating point registers. */ |
| if (core_reg_size != SIZEOF_STRUCT_FPREG) |
| warning (_("Wrong size FP register set in core file.")); |
| else |
| ppcnbsd_supply_fpreg (core_reg_sect, -1); |
| break; |
| |
| default: |
| /* Don't know what kind of register request this is; just ignore it. */ |
| break; |
| } |
| } |
| |
| static struct core_fns ppcnbsd_core_fns = |
| { |
| bfd_target_unknown_flavour, /* core_flavour */ |
| default_check_format, /* check_format */ |
| default_core_sniffer, /* core_sniffer */ |
| fetch_core_registers, /* core_read_registers */ |
| NULL /* next */ |
| }; |
| |
| static struct core_fns ppcnbsd_elfcore_fns = |
| { |
| bfd_target_elf_flavour, /* core_flavour */ |
| default_check_format, /* check_format */ |
| default_core_sniffer, /* core_sniffer */ |
| fetch_elfcore_registers, /* core_read_registers */ |
| NULL /* next */ |
| }; |
| |
| /* NetBSD is confused. It appears that 1.5 was using the correct SVr4 |
| convention but, 1.6 switched to the below broken convention. For |
| the moment use the broken convention. Ulgh!. */ |
| |
| static enum return_value_convention |
| ppcnbsd_return_value (struct gdbarch *gdbarch, struct type *valtype, |
| struct regcache *regcache, void *readbuf, |
| const void *writebuf) |
| { |
| if ((TYPE_CODE (valtype) == TYPE_CODE_STRUCT |
| || TYPE_CODE (valtype) == TYPE_CODE_UNION) |
| && !((TYPE_LENGTH (valtype) == 16 || TYPE_LENGTH (valtype) == 8) |
| && TYPE_VECTOR (valtype)) |
| && !(TYPE_LENGTH (valtype) == 1 |
| || TYPE_LENGTH (valtype) == 2 |
| || TYPE_LENGTH (valtype) == 4 |
| || TYPE_LENGTH (valtype) == 8)) |
| return RETURN_VALUE_STRUCT_CONVENTION; |
| else |
| return ppc_sysv_abi_broken_return_value (gdbarch, valtype, regcache, |
| readbuf, writebuf); |
| } |
| |
| static void |
| ppcnbsd_sigtramp_cache_init (const struct tramp_frame *self, |
| struct frame_info *next_frame, |
| struct trad_frame_cache *this_cache, |
| CORE_ADDR func) |
| { |
| CORE_ADDR base; |
| CORE_ADDR offset; |
| int i; |
| struct gdbarch *gdbarch = get_frame_arch (next_frame); |
| struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| |
| base = frame_unwind_register_unsigned (next_frame, SP_REGNUM); |
| offset = base + 0x18 + 2 * tdep->wordsize; |
| for (i = 0; i < ppc_num_gprs; i++) |
| { |
| int regnum = i + tdep->ppc_gp0_regnum; |
| trad_frame_set_reg_addr (this_cache, regnum, offset); |
| offset += tdep->wordsize; |
| } |
| trad_frame_set_reg_addr (this_cache, tdep->ppc_lr_regnum, offset); |
| offset += tdep->wordsize; |
| trad_frame_set_reg_addr (this_cache, tdep->ppc_cr_regnum, offset); |
| offset += tdep->wordsize; |
| trad_frame_set_reg_addr (this_cache, tdep->ppc_xer_regnum, offset); |
| offset += tdep->wordsize; |
| trad_frame_set_reg_addr (this_cache, tdep->ppc_ctr_regnum, offset); |
| offset += tdep->wordsize; |
| trad_frame_set_reg_addr (this_cache, PC_REGNUM, offset); /* SRR0? */ |
| offset += tdep->wordsize; |
| |
| /* Construct the frame ID using the function start. */ |
| trad_frame_set_id (this_cache, frame_id_build (base, func)); |
| } |
| |
| /* Given the NEXT frame, examine the instructions at and around this |
| frame's resume address (aka PC) to see of they look like a signal |
| trampoline. Return the address of the trampolines first |
| instruction, or zero if it isn't a signal trampoline. */ |
| |
| static const struct tramp_frame ppcnbsd_sigtramp = { |
| SIGTRAMP_FRAME, |
| 4, /* insn size */ |
| { /* insn */ |
| { 0x38610018, -1 }, /* addi r3,r1,24 */ |
| { 0x38000127, -1 }, /* li r0,295 */ |
| { 0x44000002, -1 }, /* sc */ |
| { 0x38000001, -1 }, /* li r0,1 */ |
| { 0x44000002, -1 }, /* sc */ |
| { TRAMP_SENTINEL_INSN, -1 } |
| }, |
| ppcnbsd_sigtramp_cache_init |
| }; |
| |
| static void |
| ppcnbsd_init_abi (struct gdbarch_info info, |
| struct gdbarch *gdbarch) |
| { |
| /* For NetBSD, this is an on again, off again thing. Some systems |
| do use the broken struct convention, and some don't. */ |
| set_gdbarch_return_value (gdbarch, ppcnbsd_return_value); |
| set_solib_svr4_fetch_link_map_offsets (gdbarch, |
| nbsd_ilp32_solib_svr4_fetch_link_map_offsets); |
| tramp_frame_prepend_unwinder (gdbarch, &ppcnbsd_sigtramp); |
| } |
| |
| void |
| _initialize_ppcnbsd_tdep (void) |
| { |
| gdbarch_register_osabi (bfd_arch_powerpc, 0, GDB_OSABI_NETBSD_ELF, |
| ppcnbsd_init_abi); |
| |
| deprecated_add_core_fns (&ppcnbsd_core_fns); |
| deprecated_add_core_fns (&ppcnbsd_elfcore_fns); |
| } |