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head/devel/gdb/files/kgdb/aarch64-fbsd-kern.c
| Property | Old Value | New Value |
|---|---|---|
| svn:eol-style | null | native \ No newline at end of property |
| svn:keywords | null | FreeBSD=%H \ No newline at end of property |
| svn:mime-type | null | text/plain \ No newline at end of property |
| /*- | |||||
| * Copyright (c) 2017 John Baldwin <jhb@FreeBSD.org> | |||||
| * All rights reserved. | |||||
| * | |||||
| * Redistribution and use in source and binary forms, with or without | |||||
| * modification, are permitted provided that the following conditions | |||||
| * are met: | |||||
| * | |||||
| * 1. Redistributions of source code must retain the above copyright | |||||
| * notice, this list of conditions and the following disclaimer. | |||||
| * 2. Redistributions in binary form must reproduce the above copyright | |||||
| * notice, this list of conditions and the following disclaimer in the | |||||
| * documentation and/or other materials provided with the distribution. | |||||
| * | |||||
| * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR | |||||
| * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |||||
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |||||
| * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT, | |||||
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |||||
| * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |||||
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |||||
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |||||
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |||||
| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |||||
| * | |||||
| * $FreeBSD$ | |||||
| */ | |||||
| /* Target-dependent code for FreeBSD/aarch64 kernels. */ | |||||
| #include "defs.h" | |||||
| #include "aarch64-tdep.h" | |||||
| #include "frame-unwind.h" | |||||
| #include "gdbcore.h" | |||||
| #include "osabi.h" | |||||
| #include "regcache.h" | |||||
| #include "regset.h" | |||||
| #include "solib.h" | |||||
| #include "target.h" | |||||
| #include "trad-frame.h" | |||||
| #include "kgdb.h" | |||||
| static const struct regcache_map_entry aarch64_fbsd_pcbmap[] = | |||||
| { | |||||
| { 30, AARCH64_X0_REGNUM, 8 }, /* x0 ... x29 */ | |||||
| { 1, AARCH64_LR_REGNUM, 8 }, | |||||
| { 1, AARCH64_SP_REGNUM, 8 }, | |||||
| { 1, AARCH64_PC_REGNUM, 8 }, | |||||
| { 0 } | |||||
| }; | |||||
| static const struct regset aarch64_fbsd_pcbregset = | |||||
| { | |||||
| aarch64_fbsd_pcbmap, | |||||
| regcache_supply_regset, regcache_collect_regset | |||||
| }; | |||||
| static void | |||||
| aarch64_fbsd_supply_pcb(struct regcache *regcache, CORE_ADDR pcb_addr) | |||||
| { | |||||
| gdb_byte buf[8 * 33]; | |||||
| if (target_read_memory (pcb_addr, buf, sizeof buf) == 0) | |||||
| regcache_supply_regset (&aarch64_fbsd_pcbregset, regcache, -1, buf, | |||||
| sizeof (buf)); | |||||
| } | |||||
| static struct trad_frame_cache * | |||||
| aarch64_fbsd_trapframe_cache (struct frame_info *this_frame, void **this_cache) | |||||
| { | |||||
| struct gdbarch *gdbarch = get_frame_arch (this_frame); | |||||
| enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |||||
| struct trad_frame_cache *cache; | |||||
| CORE_ADDR addr, func, pc, sp; | |||||
| const char *name; | |||||
| int i; | |||||
| if (*this_cache != NULL) | |||||
| return ((struct trad_frame_cache *)*this_cache); | |||||
| cache = trad_frame_cache_zalloc (this_frame); | |||||
| *this_cache = cache; | |||||
| func = get_frame_func (this_frame); | |||||
| sp = get_frame_register_unsigned (this_frame, AARCH64_SP_REGNUM); | |||||
| find_pc_partial_function (func, &name, NULL, NULL); | |||||
| if (strcmp(name, "fork_trampoline") == 0 && get_frame_pc (this_frame) == func) | |||||
| { | |||||
| /* fork_exit hasn't been called (kthread has never run), so SP | |||||
| hasn't been initialized yet. The stack pointer is stored in | |||||
| the X2 in the pcb. */ | |||||
| sp = get_frame_register_unsigned (this_frame, AARCH64_X0_REGNUM + 2); | |||||
| } | |||||
| trad_frame_set_reg_addr (cache, AARCH64_SP_REGNUM, sp); | |||||
| trad_frame_set_reg_addr (cache, AARCH64_LR_REGNUM, sp + 8); | |||||
| trad_frame_set_reg_addr (cache, AARCH64_PC_REGNUM, sp + 16); | |||||
| trad_frame_set_reg_addr (cache, AARCH64_CPSR_REGNUM, sp + 24); | |||||
| for (i = 0; i < 30; i++) | |||||
| trad_frame_set_reg_addr (cache, AARCH64_X0_REGNUM + 1, sp + 32 + i * 8); | |||||
| /* Read $PC from trap frame. */ | |||||
| pc = read_memory_unsigned_integer (sp + 16, 8, byte_order); | |||||
| if (pc == 0 && strcmp(name, "fork_trampoline") == 0) | |||||
| { | |||||
| /* Initial frame of a kthread; terminate backtrace. */ | |||||
| trad_frame_set_id (cache, outer_frame_id); | |||||
| } | |||||
| else | |||||
| { | |||||
| /* Construct the frame ID using the function start. */ | |||||
| trad_frame_set_id (cache, frame_id_build (sp + 8 * 34, func)); | |||||
| } | |||||
| return cache; | |||||
| } | |||||
| static void | |||||
| aarch64_fbsd_trapframe_this_id (struct frame_info *this_frame, | |||||
| void **this_cache, struct frame_id *this_id) | |||||
| { | |||||
| struct trad_frame_cache *cache = | |||||
| aarch64_fbsd_trapframe_cache (this_frame, this_cache); | |||||
| trad_frame_get_id (cache, this_id); | |||||
| } | |||||
| static struct value * | |||||
| aarch64_fbsd_trapframe_prev_register (struct frame_info *this_frame, | |||||
| void **this_cache, int regnum) | |||||
| { | |||||
| struct trad_frame_cache *cache = | |||||
| aarch64_fbsd_trapframe_cache (this_frame, this_cache); | |||||
| return trad_frame_get_register (cache, this_frame, regnum); | |||||
| } | |||||
| static int | |||||
| aarch64_fbsd_trapframe_sniffer (const struct frame_unwind *self, | |||||
| struct frame_info *this_frame, | |||||
| void **this_prologue_cache) | |||||
| { | |||||
| const char *name; | |||||
| find_pc_partial_function (get_frame_func (this_frame), &name, NULL, NULL); | |||||
| return (name && ((strcmp (name, "handle_el1h_sync") == 0) | |||||
| || (strcmp (name, "handle_el1h_irq") == 0) | |||||
| || (strcmp (name, "handle_el0h_sync") == 0) | |||||
| || (strcmp (name, "handle_el0h_irq") == 0) | |||||
| || (strcmp (name, "handle_el0h_error") == 0) | |||||
| || (strcmp (name, "fork_trampoline") == 0))); | |||||
| } | |||||
| static const struct frame_unwind aarch64_fbsd_trapframe_unwind = { | |||||
| SIGTRAMP_FRAME, | |||||
| default_frame_unwind_stop_reason, | |||||
| aarch64_fbsd_trapframe_this_id, | |||||
| aarch64_fbsd_trapframe_prev_register, | |||||
| NULL, | |||||
| aarch64_fbsd_trapframe_sniffer | |||||
| }; | |||||
| /* Implement the 'init_osabi' method of struct gdb_osabi_handler. */ | |||||
| static void | |||||
| aarch64_fbsd_kernel_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |||||
| { | |||||
| struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |||||
| frame_unwind_prepend_unwinder (gdbarch, &aarch64_fbsd_trapframe_unwind); | |||||
| set_solib_ops (gdbarch, &kld_so_ops); | |||||
| /* Enable longjmp. */ | |||||
| tdep->jb_pc = 13; | |||||
| fbsd_vmcore_set_supply_pcb (gdbarch, aarch64_fbsd_supply_pcb); | |||||
| fbsd_vmcore_set_cpu_pcb_addr (gdbarch, kgdb_trgt_stop_pcb); | |||||
| } | |||||
| /* Provide a prototype to silence -Wmissing-prototypes. */ | |||||
| extern initialize_file_ftype _initialize_aarch64_kgdb_tdep; | |||||
| void | |||||
| _initialize_aarch64_kgdb_tdep (void) | |||||
| { | |||||
| gdbarch_register_osabi_sniffer(bfd_arch_aarch64, | |||||
| bfd_target_elf_flavour, | |||||
| fbsd_kernel_osabi_sniffer); | |||||
| gdbarch_register_osabi (bfd_arch_aarch64, 0, GDB_OSABI_FREEBSD_KERNEL, | |||||
| aarch64_fbsd_kernel_init_abi); | |||||
| } | |||||