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authorVincent Chen <vincent.chen@sifive.com>2020-04-16 10:38:04 +0800
committerPalmer Dabbelt <palmerdabbelt@google.com>2020-05-18 11:38:09 -0700
commitf83b04d36e52cc3d941120ec859374fcda36eb31 (patch)
treee063a9c036c048bbcbd25828f0b1702caa35dba0 /kernel/debug
parenteb077c9c387f931767d7b737bdf696b753c57e46 (diff)
kgdb: Add kgdb_has_hit_break function
The break instruction in RISC-V does not have an immediate value field, so the kernel cannot identify the purpose of each trap exception through the opcode. This makes the existing identification schemes in other architecture unsuitable for the RISC-V kernel. To solve this problem, this patch adds kgdb_has_hit_break(), which can help RISC-V kernel identify the KGDB trap exception. Signed-off-by: Vincent Chen <vincent.chen@sifive.com> Reviewed-by: Palmer Dabbelt <palmerdabbelt@google.com> Acked-by: Daniel Thompson <daniel.thompson@linaro.org> Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
Diffstat (limited to 'kernel/debug')
-rw-r--r--kernel/debug/debug_core.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/kernel/debug/debug_core.c b/kernel/debug/debug_core.c
index 2b7c9b67931d..01bc3eea3d4d 100644
--- a/kernel/debug/debug_core.c
+++ b/kernel/debug/debug_core.c
@@ -417,6 +417,18 @@ int kgdb_isremovedbreak(unsigned long addr)
return 0;
}
+int kgdb_has_hit_break(unsigned long addr)
+{
+ int i;
+
+ for (i = 0; i < KGDB_MAX_BREAKPOINTS; i++) {
+ if (kgdb_break[i].state == BP_ACTIVE &&
+ kgdb_break[i].bpt_addr == addr)
+ return 1;
+ }
+ return 0;
+}
+
int dbg_remove_all_break(void)
{
int error;