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system/memory: Introduce ldm_p() and stm_p() load/store helpers

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Introduce load/store helpers which take a MemOp argument.

Inspired-by: Paolo Bonzini <pbonzini@redhat.com>
Suggested-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20260118193509.42923-5-philmd@linaro.org>
This commit is contained in:
Philippe Mathieu-Daudé
2026-01-09 16:31:14 +01:00
parent e3bf323f53
commit cfb88b2ce3
1 changed files with 72 additions and 0 deletions
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72
include/qemu/bswap.h
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@@ -2,6 +2,7 @@
#define BSWAP_H
#include "qemu/target-info.h"
#include "exec/memop.h"
#undef bswap16
#define bswap16(_x) __builtin_bswap16(_x)
@@ -375,6 +376,77 @@ static inline void stq_be_p(void *ptr, uint64_t v)
stq_he_p(ptr, be_bswap(v, 64));
}
/**
* ldm_p: Load value from host memory (byteswapping if necessary)
*
* @ptr: the host pointer to be accessed
* @mop: #MemOp mask containing access size and optional byteswapping
*
* Convert the value stored at @ptr in host memory and byteswap if necessary.
*
* Returns: the converted value.
*/
static inline uint64_t ldm_p(const void *ptr, MemOp mop)
{
switch (mop & (MO_SIZE | MO_BSWAP)) {
case MO_8:
return ldub_p(ptr);
case MO_16 | MO_LE:
return lduw_le_p(ptr);
case MO_16 | MO_BE:
return lduw_be_p(ptr);
case MO_32 | MO_LE:
return ldl_le_p(ptr);
case MO_32 | MO_BE:
return ldl_be_p(ptr);
case MO_64 | MO_LE:
return ldq_le_p(ptr);
case MO_64 | MO_BE:
return ldq_be_p(ptr);
default:
g_assert_not_reached();
}
}
/**
* stm_p: Store value to host memory (byteswapping if necessary)
*
* @ptr: the host pointer to be accessed
* @mop: #MemOp mask containing access size and optional byteswapping
* @val: the value to store
*
* Convert the value (byteswap if necessary) and store at @ptr in host memory.
*/
static inline void stm_p(void *ptr, MemOp mop, uint64_t val)
{
switch (mop & (MO_SIZE | MO_BSWAP)) {
case MO_8:
stb_p(ptr, val);
break;
case MO_16 | MO_LE:
stw_le_p(ptr, val);
break;
case MO_16 | MO_BE:
stw_be_p(ptr, val);
break;
case MO_32 | MO_LE:
stl_le_p(ptr, val);
break;
case MO_32 | MO_BE:
stl_be_p(ptr, val);
break;
case MO_64 | MO_LE:
stq_le_p(ptr, val);
break;
case MO_64 | MO_BE:
stq_be_p(ptr, val);
break;
default:
g_assert_not_reached();
}
}
/* Store v to p as a sz byte value in host order */
#define DO_STN_LDN_P(END) \
static inline void stn_## END ## _p(void *ptr, int sz, uint64_t v) \