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tcg: Add helper_unaligned_{ld,st} for user-only sigbus 

To be called from tcg generated code on hosts that support
unaligned accesses natively, in response to an access that
is supposed to be aligned.

Reviewed-by: Warner Losh <imp@bsdimp.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2021-07-27 19:41:04 -10:00
parent 9395cd0a38
commit 37e891e38f
2 changed files with 16 additions and 0 deletions
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11
accel/tcg/user-exec.c
View File

@ -27,6 +27,7 @@
#include "exec/helper-proto.h"
#include "qemu/atomic128.h"
#include "trace/trace-root.h"
#include "tcg/tcg-ldst.h"
#include "internal.h"
__thread uintptr_t helper_retaddr;
@ -215,6 +216,16 @@ static void validate_memop(MemOpIdx oi, MemOp expected)
#endif
}
void helper_unaligned_ld(CPUArchState *env, target_ulong addr)
{
cpu_loop_exit_sigbus(env_cpu(env), addr, MMU_DATA_LOAD, GETPC());
}
void helper_unaligned_st(CPUArchState *env, target_ulong addr)
{
cpu_loop_exit_sigbus(env_cpu(env), addr, MMU_DATA_STORE, GETPC());
}
static void *cpu_mmu_lookup(CPUArchState *env, target_ulong addr,
MemOpIdx oi, uintptr_t ra, MMUAccessType type)
{

5
include/tcg/tcg-ldst.h
View File

@ -70,5 +70,10 @@ void helper_be_stl_mmu(CPUArchState *env, target_ulong addr, uint32_t val,
void helper_be_stq_mmu(CPUArchState *env, target_ulong addr, uint64_t val,
MemOpIdx oi, uintptr_t retaddr);
#else
void QEMU_NORETURN helper_unaligned_ld(CPUArchState *env, target_ulong addr);
void QEMU_NORETURN helper_unaligned_st(CPUArchState *env, target_ulong addr);
#endif /* CONFIG_SOFTMMU */
#endif /* TCG_LDST_H */