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plugins: extend API to get latest memory value accessed

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This value can be accessed only during a memory callback, using
new qemu_plugin_mem_get_value function.

Returned value can be extended when QEMU will support accesses wider
than 128 bits.

Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1719
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2152
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Xingtao Yao <yaoxt.fnst@fujitsu.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Message-Id: <20240724194708.1843704-3-pierrick.bouvier@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20240916085400.1046925-6-alex.bennee@linaro.org>
This commit is contained in:
Pierrick Bouvier 2024-09-16 09:53:47 +01:00 committed by Alex Bennée
parent b709da5d29
commit 9505f85e2d
3 changed files with 66 additions and 0 deletions
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32
include/qemu/qemu-plugin.h
View File

@ -262,6 +262,29 @@ enum qemu_plugin_mem_rw {
QEMU_PLUGIN_MEM_RW,
};
enum qemu_plugin_mem_value_type {
QEMU_PLUGIN_MEM_VALUE_U8,
QEMU_PLUGIN_MEM_VALUE_U16,
QEMU_PLUGIN_MEM_VALUE_U32,
QEMU_PLUGIN_MEM_VALUE_U64,
QEMU_PLUGIN_MEM_VALUE_U128,
};
/* typedef qemu_plugin_mem_value - value accessed during a load/store */
typedef struct {
enum qemu_plugin_mem_value_type type;
union {
uint8_t u8;
uint16_t u16;
uint32_t u32;
uint64_t u64;
struct {
uint64_t low;
uint64_t high;
} u128;
} data;
} qemu_plugin_mem_value;
/**
* enum qemu_plugin_cond - condition to enable callback
*
@ -551,6 +574,15 @@ bool qemu_plugin_mem_is_big_endian(qemu_plugin_meminfo_t info);
QEMU_PLUGIN_API
bool qemu_plugin_mem_is_store(qemu_plugin_meminfo_t info);
/**
* qemu_plugin_mem_get_mem_value() - return last value loaded/stored
* @info: opaque memory transaction handle
*
* Returns: memory value
*/
QEMU_PLUGIN_API
qemu_plugin_mem_value qemu_plugin_mem_get_value(qemu_plugin_meminfo_t info);
/**
* qemu_plugin_get_hwaddr() - return handle for memory operation
* @info: opaque memory info structure

33
plugins/api.c
View File

@ -351,6 +351,39 @@ bool qemu_plugin_mem_is_store(qemu_plugin_meminfo_t info)
return get_plugin_meminfo_rw(info) & QEMU_PLUGIN_MEM_W;
}
qemu_plugin_mem_value qemu_plugin_mem_get_value(qemu_plugin_meminfo_t info)
{
uint64_t low = current_cpu->neg.plugin_mem_value_low;
qemu_plugin_mem_value value;
switch (qemu_plugin_mem_size_shift(info)) {
case 0:
value.type = QEMU_PLUGIN_MEM_VALUE_U8;
value.data.u8 = (uint8_t)low;
break;
case 1:
value.type = QEMU_PLUGIN_MEM_VALUE_U16;
value.data.u16 = (uint16_t)low;
break;
case 2:
value.type = QEMU_PLUGIN_MEM_VALUE_U32;
value.data.u32 = (uint32_t)low;
break;
case 3:
value.type = QEMU_PLUGIN_MEM_VALUE_U64;
value.data.u64 = low;
break;
case 4:
value.type = QEMU_PLUGIN_MEM_VALUE_U128;
value.data.u128.low = low;
value.data.u128.high = current_cpu->neg.plugin_mem_value_high;
break;
default:
g_assert_not_reached();
}
return value;
}
/*
* Virtual Memory queries
*/

1
plugins/qemu-plugins.symbols
View File

@ -13,6 +13,7 @@
qemu_plugin_insn_size;
qemu_plugin_insn_symbol;
qemu_plugin_insn_vaddr;
qemu_plugin_mem_get_value;
qemu_plugin_mem_is_big_endian;
qemu_plugin_mem_is_sign_extended;
qemu_plugin_mem_is_store;