Let gdb fetch_registers include cpu context x19~x28,
This may not mean for already scheduled tasks, but
gdb stack unwind show more args.
Before:
crash> gdb bt
#0 __switch_to (prev=<unavailable>, prev@entry=0xffffff80025f0000, next=next@entry=<unavailable>) at arch/arm64/kernel/process.c:566
#1 0xffffffc008f820b8 in context_switch (rq=0xffffff81fcf419c0, prev=0xffffff80025f0000, next=<unavailable>, rf=<optimized out>) at kernel/sched/core.c:5471
#2 __schedule (sched_mode=<optimized out>, sched_mode@entry=168999904) at kernel/sched/core.c:6857
#3 0xffffffc008f82514 in schedule () at kernel/sched/core.c:6933
...
After:
crash> gdb bt
#0 __switch_to (prev=prev@entry=0xffffff80025f0000, next=next@entry=0xffffff80026092c0) at arch/arm64/kernel/process.c:566
#1 0xffffffc008f820b8 in context_switch (rq=0xffffff81fcf419c0, prev=0xffffff80025f0000, next=0xffffff80026092c0, rf=<optimized out>) at kernel/sched/core.c:5471
#2 __schedule (sched_mode=<optimized out>, sched_mode@entry=168999904) at kernel/sched/core.c:6857
#3 0xffffffc008f82514 in schedule () at kernel/sched/core.c:6933
...
Signed-off-by: Guanyou.Chen <
chenguanyou@xiaomi.com>
---
arm64.c | 66 +++++++++++++++++++++++++++++++++++++++++++++++++++++--
defs.h | 20 +++++++++++++++++
symbols.c | 32 ++++++++++++++++++++++-----
3 files changed, 110 insertions(+), 8 deletions(-)
diff --git a/arm64.c b/arm64.c
index 4521b45..86dc341 100644
--- a/arm64.c
+++ b/arm64.c
@@ -2731,6 +2731,9 @@ arm64_stackframe_init(void)
long thread_struct_cpu_context;
long context_sp, context_pc, context_fp;
struct syment *sp1, *sp1n, *sp2, *sp2n, *sp3, *sp3n;
+ long context_x19, context_x20, context_x21, context_x22;
+ long context_x23, context_x24, context_x25, context_x26;
+ long context_x27, context_x28;
STRUCT_SIZE_INIT(note_buf, "note_buf_t");
STRUCT_SIZE_INIT(elf_prstatus, "elf_prstatus");
@@ -2814,6 +2817,16 @@ arm64_stackframe_init(void)
context_sp = MEMBER_OFFSET("cpu_context", "sp");
context_fp = MEMBER_OFFSET("cpu_context", "fp");
context_pc = MEMBER_OFFSET("cpu_context", "pc");
+ context_x19 = MEMBER_OFFSET("cpu_context", "x19");
+ context_x20 = MEMBER_OFFSET("cpu_context", "x20");
+ context_x21 = MEMBER_OFFSET("cpu_context", "x21");
+ context_x22 = MEMBER_OFFSET("cpu_context", "x22");
+ context_x23 = MEMBER_OFFSET("cpu_context", "x23");
+ context_x24 = MEMBER_OFFSET("cpu_context", "x24");
+ context_x25 = MEMBER_OFFSET("cpu_context", "x25");
+ context_x26 = MEMBER_OFFSET("cpu_context", "x26");
+ context_x27 = MEMBER_OFFSET("cpu_context", "x27");
+ context_x28 = MEMBER_OFFSET("cpu_context", "x28");
if (context_sp == INVALID_OFFSET) {
error(INFO, "cannot determine cpu_context.sp offset\n");
return;
@@ -2832,6 +2845,26 @@ arm64_stackframe_init(void)
task_struct_thread + thread_struct_cpu_context + context_fp;
ASSIGN_OFFSET(task_struct_thread_context_pc) =
task_struct_thread + thread_struct_cpu_context + context_pc;
+ ASSIGN_OFFSET(task_struct_thread_context_x19) =
+ task_struct_thread + thread_struct_cpu_context + context_x19;
+ ASSIGN_OFFSET(task_struct_thread_context_x20) =
+ task_struct_thread + thread_struct_cpu_context + context_x20;
+ ASSIGN_OFFSET(task_struct_thread_context_x21) =
+ task_struct_thread + thread_struct_cpu_context + context_x21;
+ ASSIGN_OFFSET(task_struct_thread_context_x22) =
+ task_struct_thread + thread_struct_cpu_context + context_x22;
+ ASSIGN_OFFSET(task_struct_thread_context_x23) =
+ task_struct_thread + thread_struct_cpu_context + context_x23;
+ ASSIGN_OFFSET(task_struct_thread_context_x24) =
+ task_struct_thread + thread_struct_cpu_context + context_x24;
+ ASSIGN_OFFSET(task_struct_thread_context_x25) =
+ task_struct_thread + thread_struct_cpu_context + context_x25;
+ ASSIGN_OFFSET(task_struct_thread_context_x26) =
+ task_struct_thread + thread_struct_cpu_context + context_x26;
+ ASSIGN_OFFSET(task_struct_thread_context_x27) =
+ task_struct_thread + thread_struct_cpu_context + context_x27;
+ ASSIGN_OFFSET(task_struct_thread_context_x28) =
+ task_struct_thread + thread_struct_cpu_context + context_x28;
}
#define KERNEL_MODE (1)
@@ -4256,6 +4289,16 @@ arm64_get_stackframe(struct bt_info *bt, struct arm64_stackframe *frame)
frame->sp = ULONG(tt->task_struct + OFFSET(task_struct_thread_context_sp));
frame->pc = ULONG(tt->task_struct + OFFSET(task_struct_thread_context_pc));
frame->fp = ULONG(tt->task_struct + OFFSET(task_struct_thread_context_fp));
+ frame->x19 = ULONG(tt->task_struct + OFFSET(task_struct_thread_context_x19));
+ frame->x20 = ULONG(tt->task_struct + OFFSET(task_struct_thread_context_x20));
+ frame->x21 = ULONG(tt->task_struct + OFFSET(task_struct_thread_context_x21));
+ frame->x22 = ULONG(tt->task_struct + OFFSET(task_struct_thread_context_x22));
+ frame->x23 = ULONG(tt->task_struct + OFFSET(task_struct_thread_context_x23));
+ frame->x24 = ULONG(tt->task_struct + OFFSET(task_struct_thread_context_x24));
+ frame->x25 = ULONG(tt->task_struct + OFFSET(task_struct_thread_context_x25));
+ frame->x26 = ULONG(tt->task_struct + OFFSET(task_struct_thread_context_x26));
+ frame->x27 = ULONG(tt->task_struct + OFFSET(task_struct_thread_context_x27));
+ frame->x28 = ULONG(tt->task_struct + OFFSET(task_struct_thread_context_x28));
return TRUE;
}
@@ -4280,10 +4323,29 @@ arm64_get_stack_frame(struct bt_info *bt, ulong *pcp, ulong *spp)
ur_bitmap->ur.pc = stackframe.pc;
ur_bitmap->ur.sp = stackframe.sp;
ur_bitmap->ur.regs[29] = stackframe.fp;
+ ur_bitmap->ur.regs[28] = stackframe.x28;
+ ur_bitmap->ur.regs[27] = stackframe.x27;
+ ur_bitmap->ur.regs[26] = stackframe.x26;
+ ur_bitmap->ur.regs[25] = stackframe.x25;
+ ur_bitmap->ur.regs[24] = stackframe.x24;
+ ur_bitmap->ur.regs[23] = stackframe.x23;
+ ur_bitmap->ur.regs[22] = stackframe.x22;
+ ur_bitmap->ur.regs[21] = stackframe.x21;
+ ur_bitmap->ur.regs[20] = stackframe.x20;
+ ur_bitmap->ur.regs[19] = stackframe.x19;
SET_BIT(ur_bitmap->bitmap, REG_SEQ(arm64_pt_regs, pc));
SET_BIT(ur_bitmap->bitmap, REG_SEQ(arm64_pt_regs, sp));
- SET_BIT(ur_bitmap->bitmap, REG_SEQ(arm64_pt_regs, regs[0])
- + X29_REGNUM - X0_REGNUM);
+ SET_BIT(ur_bitmap->bitmap, REG_SEQ(arm64_pt_regs, regs[0]) + X29_REGNUM - X0_REGNUM);
+ SET_BIT(ur_bitmap->bitmap, REG_SEQ(arm64_pt_regs, regs[0]) + X28_REGNUM - X0_REGNUM);
+ SET_BIT(ur_bitmap->bitmap, REG_SEQ(arm64_pt_regs, regs[0]) + X27_REGNUM - X0_REGNUM);
+ SET_BIT(ur_bitmap->bitmap, REG_SEQ(arm64_pt_regs, regs[0]) + X26_REGNUM - X0_REGNUM);
+ SET_BIT(ur_bitmap->bitmap, REG_SEQ(arm64_pt_regs, regs[0]) + X25_REGNUM - X0_REGNUM);
+ SET_BIT(ur_bitmap->bitmap, REG_SEQ(arm64_pt_regs, regs[0]) + X24_REGNUM - X0_REGNUM);
+ SET_BIT(ur_bitmap->bitmap, REG_SEQ(arm64_pt_regs, regs[0]) + X23_REGNUM - X0_REGNUM);
+ SET_BIT(ur_bitmap->bitmap, REG_SEQ(arm64_pt_regs, regs[0]) + X22_REGNUM - X0_REGNUM);
+ SET_BIT(ur_bitmap->bitmap, REG_SEQ(arm64_pt_regs, regs[0]) + X21_REGNUM - X0_REGNUM);
+ SET_BIT(ur_bitmap->bitmap, REG_SEQ(arm64_pt_regs, regs[0]) + X20_REGNUM - X0_REGNUM);
+ SET_BIT(ur_bitmap->bitmap, REG_SEQ(arm64_pt_regs, regs[0]) + X19_REGNUM - X0_REGNUM);
bt->machdep = ur_bitmap;
bt->need_free = TRUE;
}
diff --git a/defs.h b/defs.h
index 0f70827..191b394 100644
--- a/defs.h
+++ b/defs.h
@@ -2010,6 +2010,16 @@ struct offset_table { /* stash of commonly-used offsets */
long tnt_bit;
long tnt_true;
long tnt_false;
+ long task_struct_thread_context_x19;
+ long task_struct_thread_context_x20;
+ long task_struct_thread_context_x21;
+ long task_struct_thread_context_x22;
+ long task_struct_thread_context_x23;
+ long task_struct_thread_context_x24;
+ long task_struct_thread_context_x25;
+ long task_struct_thread_context_x26;
+ long task_struct_thread_context_x27;
+ long task_struct_thread_context_x28;
long task_struct_thread_context_fp;
long task_struct_thread_context_sp;
long task_struct_thread_context_pc;
@@ -3593,6 +3603,16 @@ struct machine_specific {
};
struct arm64_stackframe {
+ unsigned long x19;
+ unsigned long x20;
+ unsigned long x21;
+ unsigned long x22;
+ unsigned long x23;
+ unsigned long x24;
+ unsigned long x25;
+ unsigned long x26;
+ unsigned long x27;
+ unsigned long x28;
unsigned long fp;
unsigned long sp;
unsigned long pc;
diff --git a/symbols.c b/symbols.c
index f68cf0b..93ddf5a 100644
--- a/symbols.c
+++ b/symbols.c
@@ -9829,12 +9829,32 @@ dump_offset_table(char *spec, ulong makestruct)
OFFSET(task_struct_thread_reg29));
fprintf(fp, " task_struct_thread_reg31: %ld\n",
OFFSET(task_struct_thread_reg31));
- fprintf(fp, " task_struct_thread_context_fp: %ld\n",
- OFFSET(task_struct_thread_context_fp));
- fprintf(fp, " task_struct_thread_context_sp: %ld\n",
- OFFSET(task_struct_thread_context_sp));
- fprintf(fp, " task_struct_thread_context_pc: %ld\n",
- OFFSET(task_struct_thread_context_pc));
+ fprintf(fp, " task_struct_thread_context_x19: %ld\n",
+ OFFSET(task_struct_thread_context_x19));
+ fprintf(fp, " task_struct_thread_context_x20: %ld\n",
+ OFFSET(task_struct_thread_context_x20));
+ fprintf(fp, " task_struct_thread_context_x21: %ld\n",
+ OFFSET(task_struct_thread_context_x21));
+ fprintf(fp, " task_struct_thread_context_x22: %ld\n",
+ OFFSET(task_struct_thread_context_x22));
+ fprintf(fp, " task_struct_thread_context_x23: %ld\n",
+ OFFSET(task_struct_thread_context_x23));
+ fprintf(fp, " task_struct_thread_context_x24: %ld\n",
+ OFFSET(task_struct_thread_context_x24));
+ fprintf(fp, " task_struct_thread_context_x25: %ld\n",
+ OFFSET(task_struct_thread_context_x25));
+ fprintf(fp, " task_struct_thread_context_x26: %ld\n",
+ OFFSET(task_struct_thread_context_x26));
+ fprintf(fp, " task_struct_thread_context_x27: %ld\n",
+ OFFSET(task_struct_thread_context_x27));
+ fprintf(fp, " task_struct_thread_context_x28: %ld\n",
+ OFFSET(task_struct_thread_context_x28));
+ fprintf(fp, " task_struct_thread_context_fp: %ld\n",
+ OFFSET(task_struct_thread_context_fp));
+ fprintf(fp, " task_struct_thread_context_sp: %ld\n",
+ OFFSET(task_struct_thread_context_sp));
+ fprintf(fp, " task_struct_thread_context_pc: %ld\n",
+ OFFSET(task_struct_thread_context_pc));
fprintf(fp, " task_struct_processor: %ld\n",
OFFSET(task_struct_processor));
fprintf(fp, " task_struct_p_pptr: %ld\n",
--
2.34.1