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[PATCH v4.5 13/29] gdbstub: abstract target specific details from gdb_pu
From: |
Richard Henderson |
Subject: |
[PATCH v4.5 13/29] gdbstub: abstract target specific details from gdb_put_packet_binary |
Date: |
Thu, 2 Mar 2023 18:57:49 -0800 |
From: Alex Bennée <alex.bennee@linaro.org>
We unfortunately handle the checking of packet acknowledgement
differently for user and softmmu modes. Abstract the user mode stuff
behind gdb_got_immediate_ack with a stub for softmmu.
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20230302190846.2593720-14-alex.bennee@linaro.org>
---
gdbstub/internals.h | 15 +++++++++++++++
gdbstub/gdbstub.c | 10 ++--------
gdbstub/softmmu.c | 8 ++++++++
gdbstub/user.c | 19 +++++++++++++++++++
4 files changed, 44 insertions(+), 8 deletions(-)
diff --git a/gdbstub/internals.h b/gdbstub/internals.h
index 6bd6a05657..6534e373cb 100644
--- a/gdbstub/internals.h
+++ b/gdbstub/internals.h
@@ -110,6 +110,21 @@ void gdb_memtohex(GString *buf, const uint8_t *mem, int
len);
void gdb_memtox(GString *buf, const char *mem, int len);
void gdb_read_byte(uint8_t ch);
+/*
+ * Packet acknowledgement - we handle this slightly differently
+ * between user and softmmu mode, mainly to deal with the differences
+ * between the flexible chardev and the direct fd approaches.
+ *
+ * We currently don't support a negotiated QStartNoAckMode
+ */
+
+/**
+ * gdb_got_immediate_ack() - check ok to continue
+ *
+ * Returns true to continue, false to re-transmit for user only, the
+ * softmmu stub always returns true.
+ */
+bool gdb_got_immediate_ack(void);
/* utility helpers */
CPUState *gdb_first_attached_cpu(void);
void gdb_append_thread_id(CPUState *cpu, GString *buf);
diff --git a/gdbstub/gdbstub.c b/gdbstub/gdbstub.c
index 6907bdc99c..0476ee7039 100644
--- a/gdbstub/gdbstub.c
+++ b/gdbstub/gdbstub.c
@@ -239,15 +239,9 @@ int gdb_put_packet_binary(const char *buf, int len, bool
dump)
gdb_put_buffer(gdbserver_state.last_packet->data,
gdbserver_state.last_packet->len);
-#ifdef CONFIG_USER_ONLY
- i = gdb_get_char();
- if (i < 0)
- return -1;
- if (i == '+')
+ if (gdb_got_immediate_ack()) {
break;
-#else
- break;
-#endif
+ }
}
return 0;
}
diff --git a/gdbstub/softmmu.c b/gdbstub/softmmu.c
index 6796761fd9..04e75449a2 100644
--- a/gdbstub/softmmu.c
+++ b/gdbstub/softmmu.c
@@ -55,6 +55,14 @@ int gdb_get_cpu_index(CPUState *cpu)
return cpu->cpu_index + 1;
}
+/*
+ * We check the status of the last message in the chardev receive code
+ */
+bool gdb_got_immediate_ack(void)
+{
+ return true;
+}
+
/*
* GDB Connection management. For system emulation we do all of this
* via our existing Chardev infrastructure which allows us to support
diff --git a/gdbstub/user.c b/gdbstub/user.c
index 23b2e726f6..0c8cd028b1 100644
--- a/gdbstub/user.c
+++ b/gdbstub/user.c
@@ -54,6 +54,25 @@ int gdb_get_char(void)
return ch;
}
+bool gdb_got_immediate_ack(void)
+{
+ int i;
+
+ i = gdb_get_char();
+ if (i < 0) {
+ /* no response, continue anyway */
+ return true;
+ }
+
+ if (i == '+') {
+ /* received correctly, continue */
+ return true;
+ }
+
+ /* anything else, including '-' then try again */
+ return false;
+}
+
void gdb_put_buffer(const uint8_t *buf, int len)
{
int ret;
--
2.34.1
- [PATCH v4.5 05/29] gdbstub: define separate user/system structures, (continued)
- [PATCH v4.5 05/29] gdbstub: define separate user/system structures, Richard Henderson, 2023/03/02
- [PATCH v4.5 06/29] gdbstub: move GDBState to shared internals header, Richard Henderson, 2023/03/02
- [PATCH v4.5 08/29] gdbstub: move fromhex/tohex routines to internals, Richard Henderson, 2023/03/02
- [PATCH v4.5 09/29] gdbstub: make various helpers visible to the rest of the module, Richard Henderson, 2023/03/02
- [PATCH v4.5 10/29] gdbstub: move chunk of softmmu functionality to own file, Richard Henderson, 2023/03/02
- [PATCH v4.5 12/29] gdbstub: rationalise signal mapping in softmmu, Richard Henderson, 2023/03/02
- [PATCH v4.5 11/29] gdbstub: move chunks of user code into own files, Richard Henderson, 2023/03/02
- [PATCH v4.5 03/29] gdbstub: Make syscall_complete/[gs]et_reg target-agnostic typedefs, Richard Henderson, 2023/03/02
- [PATCH v4.5 04/29] gdbstub: clean-up indent on gdb_exit, Richard Henderson, 2023/03/02
- [PATCH v4.5 16/29] gdbstub: introduce gdb_get_max_cpus, Richard Henderson, 2023/03/02
- [PATCH v4.5 13/29] gdbstub: abstract target specific details from gdb_put_packet_binary,
Richard Henderson <=
- [PATCH v4.5 14/29] gdbstub: specialise handle_query_attached, Richard Henderson, 2023/03/02
- [PATCH v4.5 15/29] gdbstub: specialise target_memory_rw_debug, Richard Henderson, 2023/03/02
- [PATCH v4.5 07/29] includes: move tb_flush into its own header, Richard Henderson, 2023/03/02
- [PATCH v4.5 17/29] gdbstub: specialise stub_can_reverse, Richard Henderson, 2023/03/02
- [PATCH v4.5 19/29] gdbstub: don't use target_ulong while handling registers, Richard Henderson, 2023/03/02
- [PATCH v4.5 18/29] gdbstub: fix address type of gdb_set_cpu_pc, Richard Henderson, 2023/03/02
- [PATCH v4.5 20/29] gdbstub: move register helpers into standalone include, Richard Henderson, 2023/03/02
- [PATCH v4.5 22/29] gdbstub: only compile gdbstub twice for whole build, Richard Henderson, 2023/03/02
- [PATCH v4.5 21/29] gdbstub: move syscall handling to new file, Richard Henderson, 2023/03/02
- [PATCH v4.5 25/29] gdbstub: split out softmmu/user specifics for syscall handling, Richard Henderson, 2023/03/02