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 $badaddr registers. This patchset has passed the kgdbts test suite provided by Linux kernel on HiFive unleashed board and QEMU.
Changes since v3: 1. remove duplicate macro defition 2. Rename CONFIG_ARCH_SUPPORTS_GDB_XML to CONFIG_HAVE_ARCH_KGDB_QXFER_PKT in the description of patch 03/05. Changes since v2: 1. Fix typos 2. Rename CONFIG_ARCH_SUPPORTS_GDB_XML to CONFIG_HAVE_ARCH_KGDB_QXFER_PKT 3. Add the prefix kgdb_ to the handler functions and arrays that handle "qxfer" packets 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 instructions 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/gdb_xml.h | 117 +++++++++++ arch/riscv/include/asm/kdebug.h | 12 ++ arch/riscv/include/asm/kgdb.h | 112 +++++++++++ arch/riscv/include/asm/parse_asm.h | 219 +++++++++++++++++++++ arch/riscv/kernel/Makefile | 1 + arch/riscv/kernel/kgdb.c | 390 +++++++++++++++++++++++++++++++++++++ arch/riscv/kernel/traps.c | 5 + include/linux/kgdb.h | 11 ++ kernel/debug/debug_core.c | 12 ++ kernel/debug/gdbstub.c | 13 ++ lib/Kconfig.kgdb | 5 + 12 files changed, 899 insertions(+) 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 -- 2.7.4 _______________________________________________ Kgdb-bugreport mailing list Kgdb-bugreport@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kgdb-bugreport
