On Tue, 31 Mar 2020 08:23:06 PDT (-0700), vincent.c...@sifive.com wrote:
This patch set implements required ports to enable RISC-V kernel to support
KGDB and KDB features. Because there is no immediate value in the RISC-V
trap instruction, the kernel cannot identify the purpose of each trap
exception through the opcode. This makes the existing identification
schemes in other architecture unsuitable for the RISC-V kernel. In order
to solve this problem, this patch adds the kgdb_has_hit_break() to kgdb.c
to help the RISC-V kernel identify the KGDB trap exception. In addition,
the XML target description was introduced in this patch set to enable KGDB
to report the contents of the status, cause and steal registers.
This patchset has passed the kgdbts test suite provided by Linux kernel on
HiFive unleashed board and QEMU.
Changes since v1:
1. Replace the magic number with macro when filling the gdb_regs[].
2. Only support GDB XML packet instead of all query packets.
3. Move the macros used to parse instrcuton to parse_asm.h
Vincent Chen (5):
kgdb: Add kgdb_has_hit_break function
riscv: Add KGDB support
kgdb: enable arch to support XML packet support.
riscv: Use the XML target descriptions to report 3 system registers
riscv: Add SW single-step support for KDB
arch/riscv/Kconfig | 2 +
arch/riscv/include/asm/Kbuild | 1 -
arch/riscv/include/asm/gdb_xml.h | 117 ++++++++++++
arch/riscv/include/asm/kdebug.h | 12 ++
arch/riscv/include/asm/kgdb.h | 113 +++++++++++
arch/riscv/include/asm/parse_asm.h | 214 +++++++++++++++++++++
arch/riscv/kernel/Makefile | 1 +
arch/riscv/kernel/kgdb.c | 382 +++++++++++++++++++++++++++++++++++++
arch/riscv/kernel/traps.c | 5 +
include/linux/kgdb.h | 9 +
kernel/debug/debug_core.c | 12 ++
kernel/debug/gdbstub.c | 13 ++
lib/Kconfig.kgdb | 5 +
13 files changed, 885 insertions(+), 1 deletion(-)
create mode 100644 arch/riscv/include/asm/gdb_xml.h
create mode 100644 arch/riscv/include/asm/kdebug.h
create mode 100644 arch/riscv/include/asm/kgdb.h
create mode 100644 arch/riscv/include/asm/parse_asm.h
create mode 100644 arch/riscv/kernel/kgdb.c
Looks like there's some comments on #3, so I'm going to drop this patch set and
assum there will be another version coming.
Thanks!
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