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plugins: Add register write API

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This patch adds a function to the plugins API to allow plugins to write
register contents. It also moves the qemu_plugin_read_register function
so all the register-related functions are grouped together in the file.

Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Signed-off-by: Rowan Hart <rowanbhart@gmail.com>
Message-ID: <20250624175351.440780-3-rowanbhart@gmail.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-ID: <20250627112512.1880708-7-alex.bennee@linaro.org>
This commit is contained in:
Rowan Hart 2025-06-27 12:25:02 +01:00 • committed by Alex Bennée
parent 1bb6403a34
commit 1a92b65859
2 changed files with 56 additions and 24 deletions
Download patch file Download diff file Expand all files Collapse all files

54
include/qemu/qemu-plugin.h
View file

@ -871,7 +871,8 @@ struct qemu_plugin_register;
/**
* typedef qemu_plugin_reg_descriptor - register descriptions
*
* @handle: opaque handle for retrieving value with qemu_plugin_read_register
* @handle: opaque handle for retrieving value with qemu_plugin_read_register or
* writing value with qemu_plugin_write_register
* @name: register name
* @feature: optional feature descriptor, can be NULL
*/
@ -893,6 +894,41 @@ typedef struct {
QEMU_PLUGIN_API
GArray *qemu_plugin_get_registers(void);
/**
* qemu_plugin_read_register() - read register for current vCPU
*
* @handle: a @qemu_plugin_reg_handle handle
* @buf: A GByteArray for the data owned by the plugin
*
* This function is only available in a context that register read access is
* explicitly requested via the QEMU_PLUGIN_CB_R_REGS flag.
*
* Returns the size of the read register. The content of @buf is in target byte
* order. On failure returns -1.
*/
QEMU_PLUGIN_API
int qemu_plugin_read_register(struct qemu_plugin_register *handle,
GByteArray *buf);
/**
* qemu_plugin_write_register() - write register for current vCPU
*
* @handle: a @qemu_plugin_reg_handle handle
* @buf: A GByteArray for the data owned by the plugin
*
* This function is only available in a context that register write access is
* explicitly requested via the QEMU_PLUGIN_CB_RW_REGS flag.
*
* The size of @buf must be at least the size of the requested register.
* Attempting to write a register with @buf smaller than the register size
* will result in a crash or other undesired behavior.
*
* Returns the number of bytes written. On failure returns 0.
*/
QEMU_PLUGIN_API
int qemu_plugin_write_register(struct qemu_plugin_register *handle,
GByteArray *buf);
/**
* qemu_plugin_read_memory_vaddr() - read from memory using a virtual address
*
@ -915,22 +951,6 @@ QEMU_PLUGIN_API
bool qemu_plugin_read_memory_vaddr(uint64_t addr,
GByteArray *data, size_t len);
/**
* qemu_plugin_read_register() - read register for current vCPU
*
* @handle: a @qemu_plugin_reg_handle handle
* @buf: A GByteArray for the data owned by the plugin
*
* This function is only available in a context that register read access is
* explicitly requested via the QEMU_PLUGIN_CB_R_REGS flag.
*
* Returns the size of the read register. The content of @buf is in target byte
* order. On failure returns -1.
*/
QEMU_PLUGIN_API
int qemu_plugin_read_register(struct qemu_plugin_register *handle,
GByteArray *buf);
/**
* qemu_plugin_scoreboard_new() - alloc a new scoreboard
*

26
plugins/api.c
View file

@ -433,6 +433,25 @@ GArray *qemu_plugin_get_registers(void)
return create_register_handles(regs);
}
int qemu_plugin_read_register(struct qemu_plugin_register *reg, GByteArray *buf)
{
g_assert(current_cpu);
return gdb_read_register(current_cpu, buf, GPOINTER_TO_INT(reg) - 1);
}
int qemu_plugin_write_register(struct qemu_plugin_register *reg,
GByteArray *buf)
{
g_assert(current_cpu);
if (buf->len == 0 || qemu_plugin_get_cb_flags() != QEMU_PLUGIN_CB_RW_REGS) {
return -1;
}
return gdb_write_register(current_cpu, buf->data, GPOINTER_TO_INT(reg) - 1);
}
bool qemu_plugin_read_memory_vaddr(uint64_t addr, GByteArray *data, size_t len)
{
g_assert(current_cpu);
@ -453,13 +472,6 @@ bool qemu_plugin_read_memory_vaddr(uint64_t addr, GByteArray *data, size_t len)
return true;
}
int qemu_plugin_read_register(struct qemu_plugin_register *reg, GByteArray *buf)
{
g_assert(current_cpu);
return gdb_read_register(current_cpu, buf, GPOINTER_TO_INT(reg) - 1);
}
struct qemu_plugin_scoreboard *qemu_plugin_scoreboard_new(size_t element_size)
{
return plugin_scoreboard_new(element_size);