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kgdb: enable arch to support XML packet.

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The XML packet could be supported by required architecture if the
architecture defines CONFIG_HAVE_ARCH_KGDB_QXFER_PKT and implement its own
kgdb_arch_handle_qxfer_pkt(). Except for the kgdb_arch_handle_qxfer_pkt(),
the architecture also needs to record the feature supported by gdb stub
into the kgdb_arch_gdb_stub_feature, and these features will be reported
to host gdb when gdb stub receives the qSupported packet.

Signed-off-by: Vincent Chen <vincent.chen@sifive.com>
Acked-by: Daniel Thompson <daniel.thompson@linaro.org>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
This commit is contained in:
Vincent Chen 2020-06-23 13:36:42 +08:00 committed by Palmer Dabbelt
parent dcb7fd82c7
commit 8c080d3a97
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GPG Key ID: 2E1319F35FBB1889
3 changed files with 29 additions and 0 deletions
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11
include/linux/kgdb.h
View File

@ -176,6 +176,17 @@ kgdb_arch_handle_exception(int vector, int signo, int err_code,
char *remcom_out_buffer,
struct pt_regs *regs);
/**
* kgdb_arch_handle_qxfer_pkt - Handle architecture specific GDB XML
* packets.
* @remcom_in_buffer: The buffer of the packet we have read.
* @remcom_out_buffer: The buffer of %BUFMAX bytes to write a packet into.
*/
extern void
kgdb_arch_handle_qxfer_pkt(char *remcom_in_buffer,
char *remcom_out_buffer);
/**
* kgdb_call_nmi_hook - Call kgdb_nmicallback() on the current CPU
* @ignored: This parameter is only here to match the prototype.

13
kernel/debug/gdbstub.c
View File

@ -792,6 +792,19 @@ static void gdb_cmd_query(struct kgdb_state *ks)
}
break;
#endif
#ifdef CONFIG_HAVE_ARCH_KGDB_QXFER_PKT
case 'S':
if (!strncmp(remcom_in_buffer, "qSupported:", 11))
strcpy(remcom_out_buffer, kgdb_arch_gdb_stub_feature);
break;
case 'X':
if (!strncmp(remcom_in_buffer, "qXfer:", 6))
kgdb_arch_handle_qxfer_pkt(remcom_in_buffer,
remcom_out_buffer);
break;
#endif
default:
break;
}
}

5
lib/Kconfig.kgdb
View File

@ -3,6 +3,11 @@
config HAVE_ARCH_KGDB
bool
# set if architecture has the its kgdb_arch_handle_qxfer_pkt
# function to enable gdb stub to address XML packet sent from GDB.
config HAVE_ARCH_KGDB_QXFER_PKT
bool
menuconfig KGDB
bool "KGDB: kernel debugger"
depends on HAVE_ARCH_KGDB