On 05/03/18 23:43, Douglas Anderson wrote:
This is the equivalent of commit 001bf455d206 ("ARM: 8428/1: kgdb: Fix registers on sleeping tasks") but for arm64. Nuff said....well, perhaps I could also add that task_pt_regs are userspace registers and that's not what kgdb is supposed to be reporting. We're supposed to be reporting kernel registers. Signed-off-by: Douglas Anderson <diand...@chromium.org>
I hacked together a (still very immature) kgdb test suite[1] around the turn of the year. Whilst its not quite solid enough for me to recommend others deploy it except out of curiosity... so I haven't yet started yelling about test suite failures except in the privacy of my own head.
However I can confirm that this patch fixes one of the test suite failures I haven't had time to blame allocate yet!
So... Tested-by: Daniel Thompson <daniel.thomp...@linaro.org> BTW is this something that should Cc: stable? Daniel. [1] https://github.com/daniel-thompson/kgdbtest
--- Changes in v2: - Init cpu_context in one line - Explain that task_pt_regs are userspace arch/arm64/kernel/kgdb.c | 21 ++++++++++++++++----- 1 file changed, 16 insertions(+), 5 deletions(-) diff --git a/arch/arm64/kernel/kgdb.c b/arch/arm64/kernel/kgdb.c index 2122cd187f19..a20de58061a8 100644 --- a/arch/arm64/kernel/kgdb.c +++ b/arch/arm64/kernel/kgdb.c @@ -138,14 +138,25 @@ int dbg_set_reg(int regno, void *mem, struct pt_regs *regs) void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *task) { - struct pt_regs *thread_regs; + struct cpu_context *cpu_context = &task->thread.cpu_context;/* Initialize to zero */memset((char *)gdb_regs, 0, NUMREGBYTES); - thread_regs = task_pt_regs(task); - memcpy((void *)gdb_regs, (void *)thread_regs->regs, GP_REG_BYTES); - /* Special case for PSTATE (check comments in asm/kgdb.h for details) */ - dbg_get_reg(33, gdb_regs + GP_REG_BYTES, thread_regs); + + gdb_regs[19] = cpu_context->x19; + gdb_regs[20] = cpu_context->x20; + gdb_regs[21] = cpu_context->x21; + gdb_regs[22] = cpu_context->x22; + gdb_regs[23] = cpu_context->x23; + gdb_regs[24] = cpu_context->x24; + gdb_regs[25] = cpu_context->x25; + gdb_regs[26] = cpu_context->x26; + gdb_regs[27] = cpu_context->x27; + gdb_regs[28] = cpu_context->x28; + gdb_regs[29] = cpu_context->fp; + + gdb_regs[31] = cpu_context->sp; + gdb_regs[32] = cpu_context->pc; }void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long pc)
