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author | mhorne <mhorne@FreeBSD.org> | 2020-12-09 20:38:42 +0000 |
---|---|---|
committer | Mitchell Horne <mhorne@FreeBSD.org> | 2021-01-08 18:53:44 +0000 |
commit | bbfa199cbc1698631a0e932848e62dd76559d4d7 (patch) | |
tree | 210d991f5d5cba21bf253964e043842305d5f4b0 | |
parent | 5f66d5a313bf2b2254de92b2915e48e5cf528893 (diff) | |
download | src-bbfa199cbc1698631a0e932848e62dd76559d4d7.tar.gz src-bbfa199cbc1698631a0e932848e62dd76559d4d7.zip |
arm64: gdb(4) machine-dependent bits
Everything required for remote kernel debugging over a serial
connection. For FDT-based systems, a debug port can be specified by
setting hw.fdt.dbgport to the desired device tree node in loader.conf.
For example, hw.fdt.dbgport="uart1", or
hw.fdt.dbgport="serial@ff1a0000".
Looks good: emaste
Tested by: rwatson
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D27727
-rw-r--r-- | sys/arm64/arm64/gdb_machdep.c | 112 | ||||
-rw-r--r-- | sys/arm64/conf/GENERIC | 2 | ||||
-rw-r--r-- | sys/arm64/include/gdb_machdep.h | 81 | ||||
-rw-r--r-- | sys/conf/files.arm64 | 1 |
4 files changed, 195 insertions, 1 deletions
diff --git a/sys/arm64/arm64/gdb_machdep.c b/sys/arm64/arm64/gdb_machdep.c new file mode 100644 index 000000000000..dc0a7eeba692 --- /dev/null +++ b/sys/arm64/arm64/gdb_machdep.c @@ -0,0 +1,112 @@ +/*- + * SPDX-License-Identifier: BSD-2-Clause-FreeBSD + * + * Copyright (c) 2020 The FreeBSD Foundation + * + * This software was developed by Mitchell Horne under sponsorship from + * the FreeBSD Foundation. + * + * 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 AUTHOR AND CONTRIBUTORS ``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 AUTHOR OR CONTRIBUTORS 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. + */ + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/kdb.h> +#include <sys/kernel.h> +#include <sys/proc.h> +#include <sys/signal.h> + +#include <machine/armreg.h> +#include <machine/frame.h> +#include <machine/gdb_machdep.h> +#include <machine/pcb.h> + +#include <gdb/gdb.h> + +void * +gdb_cpu_getreg(int regnum, size_t *regsz) +{ + + *regsz = gdb_cpu_regsz(regnum); + + if (kdb_thread == curthread) { + switch (regnum) { + case GDB_REG_LR: return (&kdb_frame->tf_lr); + case GDB_REG_SP: return (&kdb_frame->tf_sp); + case GDB_REG_PC: return (&kdb_frame->tf_elr); + case GDB_REG_CSPR: return (&kdb_frame->tf_spsr); + } + } + switch (regnum) { + case GDB_REG_SP: return (&kdb_thrctx->pcb_sp); + case GDB_REG_PC: /* FALLTHROUGH */ + case GDB_REG_LR: return (&kdb_thrctx->pcb_lr); + default: + if (regnum >= GDB_REG_X0 && regnum <= GDB_REG_X29) + return (&kdb_thrctx->pcb_x[regnum]); + break; + } + + return (NULL); +} + +void +gdb_cpu_setreg(int regnum, void *val) +{ + register_t regval = *(register_t *)val; + + /* For curthread, keep the pcb and trapframe in sync. */ + if (kdb_thread == curthread) { + switch (regnum) { + case GDB_REG_PC: kdb_frame->tf_elr = regval; break; + case GDB_REG_SP: kdb_frame->tf_sp = regval; break; + default: + if (regnum >= GDB_REG_X0 && regnum <= GDB_REG_X29) { + kdb_frame->tf_x[regnum] = regval; + } + break; + } + } + switch (regnum) { + case GDB_REG_PC: /* FALLTHROUGH */ + case GDB_REG_LR: kdb_thrctx->pcb_lr = regval; break; + case GDB_REG_SP: kdb_thrctx->pcb_sp = regval; break; + default: + if (regnum >= GDB_REG_X0 && regnum <= GDB_REG_X29) { + kdb_thrctx->pcb_x[regnum] = regval; + } + break; + } +} + +int +gdb_cpu_signal(int type, int code __unused) +{ + + switch (type) { + case EXCP_WATCHPT_EL1: + case EXCP_SOFTSTP_EL1: + case EXCP_BRK: + return (SIGTRAP); + } + return (SIGEMT); +} diff --git a/sys/arm64/conf/GENERIC b/sys/arm64/conf/GENERIC index 280a5efeeb0b..268089dba1fc 100644 --- a/sys/arm64/conf/GENERIC +++ b/sys/arm64/conf/GENERIC @@ -87,7 +87,7 @@ options KDB # Enable kernel debugger support. options KDB_TRACE # Print a stack trace for a panic. # For full debugger support use (turn off in stable branch): options DDB # Support DDB. -#options GDB # Support remote GDB. +options GDB # Support remote GDB. options DEADLKRES # Enable the deadlock resolver options INVARIANTS # Enable calls of extra sanity checking options INVARIANT_SUPPORT # Extra sanity checks of internal structures, required by INVARIANTS diff --git a/sys/arm64/include/gdb_machdep.h b/sys/arm64/include/gdb_machdep.h new file mode 100644 index 000000000000..755c5d1657c0 --- /dev/null +++ b/sys/arm64/include/gdb_machdep.h @@ -0,0 +1,81 @@ +/*- + * SPDX-License-Identifier: BSD-2-Clause-FreeBSD + * + * Copyright (c) 2020 The FreeBSD Foundation + * + * This software was developed by Mitchell Horne under sponsorship from + * the FreeBSD Foundation. + * + * 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 AUTHOR AND CONTRIBUTORS ``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 AUTHOR OR CONTRIBUTORS 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. + */ + +#ifndef _MACHINE_GDB_MACHDEP_H_ +#define _MACHINE_GDB_MACHDEP_H_ + +#define GDB_BUFSZ 4096 +#define GDB_NREGS 68 +#define GDB_REG_X0 0 +#define GDB_REG_X29 29 +#define GDB_REG_LR 30 +#define GDB_REG_SP 31 +#define GDB_REG_PC 32 +#define GDB_REG_CSPR 33 +#define GDB_REG_V0 34 +#define GDB_REG_V31 65 +#define GDB_REG_FPSR 66 +#define GDB_REG_FPCR 67 +_Static_assert(GDB_BUFSZ >= (GDB_NREGS * 16), "buffer fits 'g' regs"); + +static __inline size_t +gdb_cpu_regsz(int regnum) +{ + if (regnum == GDB_REG_CSPR || regnum == GDB_REG_FPSR || + regnum == GDB_REG_FPCR) + return (4); + else if (regnum >= GDB_REG_V0 && regnum <= GDB_REG_V31) + return (16); + + return (8); +} + +static __inline int +gdb_cpu_query(void) +{ + return (0); +} + +static __inline void * +gdb_begin_write(void) +{ + return (NULL); +} + +static __inline void +gdb_end_write(void *arg __unused) +{ +} + +void *gdb_cpu_getreg(int, size_t *); +void gdb_cpu_setreg(int, void *); +int gdb_cpu_signal(int, int); + +#endif /* !_MACHINE_GDB_MACHDEP_H_ */ diff --git a/sys/conf/files.arm64 b/sys/conf/files.arm64 index 4bb454fd4e2a..3cd34c170778 100644 --- a/sys/conf/files.arm64 +++ b/sys/conf/files.arm64 @@ -168,6 +168,7 @@ arm64/arm64/elf32_machdep.c optional compat_freebsd32 arm64/arm64/elf_machdep.c standard arm64/arm64/exception.S standard arm64/arm64/freebsd32_machdep.c optional compat_freebsd32 +arm64/arm64/gdb_machdep.c optional gdb arm64/arm64/gicv3_its.c optional intrng fdt arm64/arm64/gic_v3.c standard arm64/arm64/gic_v3_acpi.c optional acpi |