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| author | Qing Zhang <zhangqing@loongson.cn> | 2023-09-06 16:53:55 +0200 |
|---|---|---|
| committer | Huacai Chen <chenhuacai@loongson.cn> | 2023-09-06 16:53:55 +0200 |
| commit | e14dd076964ef11e9d6e3b06a2f1c6bb7d034133 (patch) | |
| tree | 18cf9ddd3cc4b36b0e4d8b57a1ac7a281001af4a /arch/loongarch/kernel/traps.c | |
| parent | LoongArch: Add Loongson Binary Translation (LBT) extension support (diff) | |
| download | linux-e14dd076964ef11e9d6e3b06a2f1c6bb7d034133.tar.xz linux-e14dd076964ef11e9d6e3b06a2f1c6bb7d034133.zip | |
LoongArch: Add basic KGDB & KDB support
KGDB is intended to be used as a source level debugger for the Linux
kernel. It is used along with gdb to debug a Linux kernel. GDB can be
used to "break in" to the kernel to inspect memory, variables and regs
similar to the way an application developer would use GDB to debug an
application. KDB is a frontend of KGDB which is similar to GDB.
By now, in addition to the generic KGDB features, the LoongArch KGDB
implements the following features:
- Hardware breakpoints/watchpoints;
- Software single-step support for KDB.
Signed-off-by: Qing Zhang <zhangqing@loongson.cn> # Framework & CoreFeature
Signed-off-by: Binbin Zhou <zhoubinbin@loongson.cn> # BreakPoint & SingleStep
Signed-off-by: Hui Li <lihui@loongson.cn> # Some Minor Improvements
Signed-off-by: Randy Dunlap <rdunlap@infradead.org> # Some Build Error Fixes
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Diffstat (limited to 'arch/loongarch/kernel/traps.c')
| -rw-r--r-- | arch/loongarch/kernel/traps.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/loongarch/kernel/traps.c b/arch/loongarch/kernel/traps.c index 7ed01a7b2542..65214774ef7c 100644 --- a/arch/loongarch/kernel/traps.c +++ b/arch/loongarch/kernel/traps.c @@ -38,6 +38,7 @@ #include <asm/fpu.h> #include <asm/lbt.h> #include <asm/inst.h> +#include <asm/kgdb.h> #include <asm/loongarch.h> #include <asm/mmu_context.h> #include <asm/pgtable.h> @@ -703,6 +704,11 @@ asmlinkage void noinstr do_bp(struct pt_regs *regs) * pertain to them. */ switch (bcode) { + case BRK_KDB: + if (kgdb_breakpoint_handler(regs)) + goto out; + else + break; case BRK_KPROBE_BP: if (kprobe_breakpoint_handler(regs)) goto out; @@ -769,6 +775,9 @@ asmlinkage void noinstr do_watch(struct pt_regs *regs) #ifndef CONFIG_HAVE_HW_BREAKPOINT pr_warn("Hardware watch point handler not implemented!\n"); #else + if (kgdb_breakpoint_handler(regs)) + goto out; + if (test_tsk_thread_flag(current, TIF_SINGLESTEP)) { int llbit = (csr_read32(LOONGARCH_CSR_LLBCTL) & 0x1); unsigned long pc = instruction_pointer(regs); |