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include/exec: Provide the cpu_internal_tswap() functions

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These functions are needed to support semihosting on CPUs that support
runtime-configurable endianness. They should not be used in other contexts.

Signed-off-by: Martin Kröning <martin.kroening@eonerc.rwth-aachen.de>
Message-id: 20260311-semihosting-cpu-tswap-v3-2-8e239575ec08@eonerc.rwth-aachen.de
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Tested-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Martin Kröning
2026-03-11 17:27:15 +01:00
committed by Peter Maydell
parent 95b1f7cfd1
commit c24e94fd15
1 changed files with 36 additions and 0 deletions
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36
include/exec/tswap.h
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@@ -10,6 +10,7 @@
#include "qemu/bswap.h"
#include "qemu/target-info.h"
#include "hw/core/cpu.h"
/*
* If we're in target-specific code, we can hard-code the swapping
@@ -72,4 +73,39 @@ static inline void tswap64s(uint64_t *s)
}
#endif
/*
* If we're in semihosting code, have to swap depending on the currently
* configured endianness of the CPU. These functions should not be used in
* other contexts.
*/
#define cpu_internal_needs_bswap(cpu) \
(HOST_BIG_ENDIAN != cpu_internal_is_big_endian(cpu))
static inline uint16_t cpu_internal_tswap16(CPUState *cpu, uint16_t s)
{
if (cpu_internal_needs_bswap(cpu)) {
return bswap16(s);
} else {
return s;
}
}
static inline uint32_t cpu_internal_tswap32(CPUState *cpu, uint32_t s)
{
if (cpu_internal_needs_bswap(cpu)) {
return bswap32(s);
} else {
return s;
}
}
static inline uint64_t cpu_internal_tswap64(CPUState *cpu, uint64_t s)
{
if (cpu_internal_needs_bswap(cpu)) {
return bswap64(s);
} else {
return s;
}
}
#endif /* TSWAP_H */