LoongArch: Add uprobes support
authorTiezhu Yang <yangtiezhu@loongson.cn>
Thu, 29 Jun 2023 12:58:44 +0000 (20:58 +0800)
committerHuacai Chen <chenhuacai@loongson.cn>
Thu, 29 Jun 2023 12:58:44 +0000 (20:58 +0800)
commit19bc6cb6409289106d38f9ad1b2ecf73980df6b5
tree23e10110a9a710a1ae89e026f971e735a91ec19a
parent6e320363339b585a36bf40d74592db3db021e017
LoongArch: Add uprobes support

Uprobes is the user-space counterpart to kprobes, this patch adds
uprobes support for LoongArch.

Here is a simple example with CONFIG_UPROBE_EVENTS=y:

  # cat test.c
  #include <stdio.h>

  int add(int a, int b)
  {
     return a + b;
  }

  int main()
  {
  return add(2, 7);
  }
  # gcc test.c -o /tmp/test
  # nm /tmp/test | grep add
  0000000120004194 T add
  # cd /sys/kernel/debug/tracing
  # echo > uprobe_events
  # echo "p:myuprobe /tmp/test:0x4194 %r4 %r5" > uprobe_events
  # echo "r:myuretprobe /tmp/test:0x4194 %r4" >> uprobe_events
  # echo 1 > events/uprobes/enable
  # echo 1 > tracing_on
  # /tmp/test
  # cat trace
  ...
  #           TASK-PID     CPU#  |||||  TIMESTAMP  FUNCTION
  #              | |         |   |||||     |         |
              test-1060    [001] DNZff  1015.770620: myuprobe: (0x120004194) arg1=0x2 arg2=0x7
              test-1060    [001] DNZff  1015.770930: myuretprobe: (0x1200041f0 <- 0x120004194) arg1=0x9

Tested-by: Jeff Xie <xiehuan09@gmail.com>
Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
arch/loongarch/Kconfig
arch/loongarch/include/asm/uprobes.h [new file with mode: 0644]
arch/loongarch/kernel/Makefile
arch/loongarch/kernel/traps.c
arch/loongarch/kernel/uprobes.c [new file with mode: 0644]