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plugins: Copy memory in qemu_plugin_insn_data

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Instead of returning a host pointer, copy the data into
storage provided by the caller.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2024-04-02 21:24:52 -10:00
parent bf4bb074b7
commit 4abc892362
4 changed files with 17 additions and 14 deletions
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5
contrib/plugins/execlog.c
View File

@ -258,8 +258,9 @@ static void vcpu_tb_trans(qemu_plugin_id_t id, struct qemu_plugin_tb *tb)
NULL);
}
} else {
uint32_t insn_opcode;
insn_opcode = *((uint32_t *)qemu_plugin_insn_data(insn));
uint32_t insn_opcode = 0;
qemu_plugin_insn_data(insn, &insn_opcode, sizeof(insn_opcode));
char *output = g_strdup_printf("0x%"PRIx64", 0x%"PRIx32", \"%s\"",
insn_vaddr, insn_opcode, insn_disas);

4
contrib/plugins/howvec.c
View File

@ -252,7 +252,7 @@ static struct qemu_plugin_scoreboard *find_counter(
{
int i;
uint64_t *cnt = NULL;
uint32_t opcode;
uint32_t opcode = 0;
InsnClassExecCount *class = NULL;
/*
@ -261,7 +261,7 @@ static struct qemu_plugin_scoreboard *find_counter(
* They would probably benefit from a more tailored plugin.
* However we can fall back to individual instruction counting.
*/
opcode = *((uint32_t *)qemu_plugin_insn_data(insn));
qemu_plugin_insn_data(insn, &opcode, sizeof(opcode));
for (i = 0; !cnt && i < class_table_sz; i++) {
class = &class_table[i];

15
include/qemu/qemu-plugin.h
View File

@ -61,7 +61,7 @@ typedef uint64_t qemu_plugin_id_t;
extern QEMU_PLUGIN_EXPORT int qemu_plugin_version;
#define QEMU_PLUGIN_VERSION 2
#define QEMU_PLUGIN_VERSION 3
/**
* struct qemu_info_t - system information for plugins
@ -394,17 +394,16 @@ struct qemu_plugin_insn *
qemu_plugin_tb_get_insn(const struct qemu_plugin_tb *tb, size_t idx);
/**
* qemu_plugin_insn_data() - return ptr to instruction data
* qemu_plugin_insn_data() - copy instruction data
* @insn: opaque instruction handle from qemu_plugin_tb_get_insn()
* @dest: destination into which data is copied
* @len: length of dest
*
* Note: data is only valid for duration of callback. See
* qemu_plugin_insn_size() to calculate size of stream.
*
* Returns: pointer to a stream of bytes containing the value of this
* instructions opcode.
* Returns the number of bytes copied, minimum of @len and insn size.
*/
QEMU_PLUGIN_API
const void *qemu_plugin_insn_data(const struct qemu_plugin_insn *insn);
size_t qemu_plugin_insn_data(const struct qemu_plugin_insn *insn,
void *dest, size_t len);
/**
* qemu_plugin_insn_size() - return size of instruction

7
plugins/api.c
View File

@ -216,9 +216,12 @@ qemu_plugin_tb_get_insn(const struct qemu_plugin_tb *tb, size_t idx)
* instruction being translated.
*/
const void *qemu_plugin_insn_data(const struct qemu_plugin_insn *insn)
size_t qemu_plugin_insn_data(const struct qemu_plugin_insn *insn,
void *dest, size_t len)
{
return insn->data->data;
len = MIN(len, insn->data->len);
memcpy(dest, insn->data->data, len);
return len;
}
size_t qemu_plugin_insn_size(const struct qemu_plugin_insn *insn)