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kgdb: Add kgdb_has_hit_break function

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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>
This commit is contained in:
Vincent Chen 2020-04-16 10:38:04 +08:00 committed by Palmer Dabbelt
parent eb077c9c38
commit f83b04d36e
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1 changed files with 12 additions and 0 deletions
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12
kernel/debug/debug_core.c
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@ -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;