diff mbox series

[RFC,v2,3/7] plugins: provide helper functions for plugins

Message ID 152819517217.30857.1806942753626059939.stgit@pasha-ThinkPad-T60
State New
Headers show
Series QEMU binary instrumentation prototype | expand

Commit Message

Pavel Dovgalyuk June 5, 2018, 10:39 a.m. UTC 
From: Pavel Dovgalyuk <pavel.dovgaluk@ispras.ru>

This patch adds interface functions that may be called from the loaded plugins.
Such functions are needed to inspect the VM state and to pass data
to the QEMU (e.g., QEMU-side logging).

Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru>
---
 Makefile.target           |    2 +-
 plugins/include/plugins.h |    6 ++++++
 plugins/qemulib.c         |   31 +++++++++++++++++++++++++++++++
 3 files changed, 38 insertions(+), 1 deletion(-)
 create mode 100644 plugins/qemulib.c

Comments

Alex Bennée Sept. 7, 2018, 1:06 p.m. UTC | #1 
Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru> writes:

> From: Pavel Dovgalyuk <pavel.dovgaluk@ispras.ru>
>
> This patch adds interface functions that may be called from the loaded plugins.
> Such functions are needed to inspect the VM state and to pass data
> to the QEMU (e.g., QEMU-side logging).
>
> Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru>

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>

> ---
>  Makefile.target           |    2 +-
>  plugins/include/plugins.h |    6 ++++++
>  plugins/qemulib.c         |   31 +++++++++++++++++++++++++++++++
>  3 files changed, 38 insertions(+), 1 deletion(-)
>  create mode 100644 plugins/qemulib.c
>
> diff --git a/Makefile.target b/Makefile.target
> index 4cffd96..5648c9c 100644
> --- a/Makefile.target
> +++ b/Makefile.target
> @@ -93,7 +93,7 @@ all: $(PROGS) stap
>  # cpu emulator library
>  obj-y += exec.o
>  obj-y += accel/
> -obj-$(CONFIG_PLUGINS) += plugins/plugins.o
> +obj-$(CONFIG_PLUGINS) += plugins/plugins.o plugins/qemulib.o
>  obj-$(CONFIG_TCG) += tcg/tcg.o tcg/tcg-op.o tcg/tcg-op-vec.o tcg/tcg-op-gvec.o
>  obj-$(CONFIG_TCG) += tcg/tcg-common.o tcg/optimize.o
>  obj-$(CONFIG_TCG_INTERPRETER) += tcg/tci.o
> diff --git a/plugins/include/plugins.h b/plugins/include/plugins.h
> index 100a786..fa624ea 100644
> --- a/plugins/include/plugins.h
> +++ b/plugins/include/plugins.h
> @@ -9,4 +9,10 @@ bool plugin_init(const char *args);
>  bool plugin_needs_before_insn(uint64_t pc, void *cpu);
>  void plugin_before_insn(uint64_t pc, void *cpu);
>
> +/* QEMU interface */
> +
> +void qemulib_log(const char *fmt, ...) /*GCC_FMT_ATTR(1, 2)*/;
> +int qemulib_read_memory(void *cpu, uint64_t addr, uint8_t *buf, int len);
> +int qemulib_read_register(void *cpu, uint8_t *mem_buf, int reg);
> +
>  #endif /* PLUGINS_INTERFACE_H */
> diff --git a/plugins/qemulib.c b/plugins/qemulib.c
> new file mode 100644
> index 0000000..eb812c1
> --- /dev/null
> +++ b/plugins/qemulib.c
> @@ -0,0 +1,31 @@
> +#include "qemu/osdep.h"
> +#include "qemu-common.h"
> +#include "cpu.h"
> +#include "qemu/error-report.h"
> +#include "qemu/plugins.h"
> +#include "qemu/log.h"
> +#include "include/plugins.h"
> +
> +void qemulib_log(const char *fmt, ...)
> +{
> +    va_list args;
> +    va_start(args, fmt);
> +    qemu_log_vprintf(fmt, args);
> +    va_end(args);
> +}
> +
> +int qemulib_read_memory(void *cpu, uint64_t addr, uint8_t *buf, int len)
> +{
> +    return cpu_memory_rw_debug(cpu, addr, buf, len, false);
> +}
> +
> +int qemulib_read_register(void *cpu, uint8_t *mem_buf, int reg)
> +{
> +    CPUClass *cc = CPU_GET_CLASS(cpu);
> +
> +    if (reg < cc->gdb_num_core_regs) {
> +        return cc->gdb_read_register(cpu, mem_buf, reg);
> +    }
> +
> +    return 0;
> +}


--
Alex Bennée
diff mbox series

Patch

diff --git a/Makefile.target b/Makefile.target
index 4cffd96..5648c9c 100644
--- a/Makefile.target
+++ b/Makefile.target
@@ -93,7 +93,7 @@  all: $(PROGS) stap
 # cpu emulator library
 obj-y += exec.o
 obj-y += accel/
-obj-$(CONFIG_PLUGINS) += plugins/plugins.o
+obj-$(CONFIG_PLUGINS) += plugins/plugins.o plugins/qemulib.o
 obj-$(CONFIG_TCG) += tcg/tcg.o tcg/tcg-op.o tcg/tcg-op-vec.o tcg/tcg-op-gvec.o
 obj-$(CONFIG_TCG) += tcg/tcg-common.o tcg/optimize.o
 obj-$(CONFIG_TCG_INTERPRETER) += tcg/tci.o
diff --git a/plugins/include/plugins.h b/plugins/include/plugins.h
index 100a786..fa624ea 100644
--- a/plugins/include/plugins.h
+++ b/plugins/include/plugins.h
@@ -9,4 +9,10 @@  bool plugin_init(const char *args);
 bool plugin_needs_before_insn(uint64_t pc, void *cpu);
 void plugin_before_insn(uint64_t pc, void *cpu);
 
+/* QEMU interface */
+
+void qemulib_log(const char *fmt, ...) /*GCC_FMT_ATTR(1, 2)*/;
+int qemulib_read_memory(void *cpu, uint64_t addr, uint8_t *buf, int len);
+int qemulib_read_register(void *cpu, uint8_t *mem_buf, int reg);
+
 #endif /* PLUGINS_INTERFACE_H */
diff --git a/plugins/qemulib.c b/plugins/qemulib.c
new file mode 100644
index 0000000..eb812c1
--- /dev/null
+++ b/plugins/qemulib.c
@@ -0,0 +1,31 @@ 
+#include "qemu/osdep.h"
+#include "qemu-common.h"
+#include "cpu.h"
+#include "qemu/error-report.h"
+#include "qemu/plugins.h"
+#include "qemu/log.h"
+#include "include/plugins.h"
+
+void qemulib_log(const char *fmt, ...)
+{
+    va_list args;
+    va_start(args, fmt);
+    qemu_log_vprintf(fmt, args);
+    va_end(args);
+}
+
+int qemulib_read_memory(void *cpu, uint64_t addr, uint8_t *buf, int len)
+{
+    return cpu_memory_rw_debug(cpu, addr, buf, len, false);
+}
+
+int qemulib_read_register(void *cpu, uint8_t *mem_buf, int reg)
+{
+    CPUClass *cc = CPU_GET_CLASS(cpu);
+
+    if (reg < cc->gdb_num_core_regs) {
+        return cc->gdb_read_register(cpu, mem_buf, reg);
+    }
+
+    return 0;
+}