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authorHui Li <lihui@loongson.cn>2024-06-11 19:21:25 +0800
committerTiezhu Yang <yangtiezhu@loongson.cn>2024-06-25 05:50:08 +0800
commitc1cdee0e2c1715718c1e6224038096142ccabe40 (patch)
tree1e50ae293e34a0f0bde9f21c71fc68a956cb24ed /include/elf
parent5ae5974d60378fa3faecff64725e00c8695bcc7d (diff)
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gdb: LoongArch: Add support for hardware watchpoint
LoongArch defines hardware watchpoint functions for load/store operations. After the software configures the watchpoints for load/store, the processor hardware will monitor the access addresses of the load/store operations and trigger watchpoint exception when the watchpoint setting conditions are met. After this patch, watch/rwatch/awatch command are supported. Refer to the following document for hardware watchpoint. https://loongson.github.io/LoongArch-Documentation/LoongArch-Vol1-EN.html#control-and-status-registers-related-to-watchpoints A simple test is as follows: lihui@bogon:~$ cat test.c #include <stdio.h> int a = 0; int main() { printf("start test\n"); a = 1; printf("a = %d\n", a); printf("end test\n"); return 0; } lihui@bogon:~$ gcc -g test.c -o test without this patch: lihui@bogon:~$ gdb test ... (gdb) start ... Temporary breakpoint 1, main () at test.c:5 5 printf("start test\n"); (gdb) awatch a Target does not support this type of hardware watchpoint. ... with this patch: lihui@bogon:~$ gdb test ... (gdb) start ... Temporary breakpoint 1, main () at test.c:5 5 printf("start test\n"); (gdb) awatch a Hardware access (read/write) watchpoint 2: a (gdb) c Continuing. start test Hardware access (read/write) watchpoint 2: a Old value = 0 New value = 1 main () at test.c:7 7 printf("a = %d\n", a); (gdb) c Continuing. Hardware access (read/write) watchpoint 2: a Value = 1 0x00000001200006e0 in main () at test.c:7 7 printf("a = %d\n", a); (gdb) c Continuing. a = 1 end test [Inferior 1 (process 22250) exited normally] Signed-off-by: Hui Li <lihui@loongson.cn> Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Diffstat (limited to 'include/elf')
-rw-r--r--include/elf/common.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/elf/common.h b/include/elf/common.h
index 78c85bd..2d18334 100644
--- a/include/elf/common.h
+++ b/include/elf/common.h
@@ -751,6 +751,8 @@
/* note name must be "LINUX". */
#define NT_LARCH_LBT 0xa04 /* LoongArch Binary Translation registers */
/* note name must be "CORE". */
+#define NT_LOONGARCH_HW_WATCH 0xa06 /* LoongArch hardware watchpoint registers */
+ /* note name must be "LINUX". */
#define NT_RISCV_CSR 0x900 /* RISC-V Control and Status Registers */
/* note name must be "LINUX". */
#define NT_SIGINFO 0x53494749 /* Fields of siginfo_t. */