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arm: cpu: handle BE32 user-mode as BE

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endian with address manipulations on subword accesses (to give the
illusion of BE). But user-mode cannot tell the difference and is
already implemented as straight BE. So handle the difference in the
endianess query, where USER mode is BE and system is not.

Backports commit b2e62d9a7b9a2eb10e451a57813bad168376e122 from qemu
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Peter Crosthwaite 2018-02-21 02:12:16 -05:00 committed by Lioncash
parent 1457b73a13
commit 38f4a833a4
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1 changed files with 16 additions and 1 deletions
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17
qemu/target-arm/cpu.h
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@ -2174,7 +2174,22 @@ static inline bool arm_cpu_data_is_big_endian(CPUARMState *env)
/* In 32bit endianness is determined by looking at CPSR's E bit */
if (!is_a64(env)) {
return (env->uncached_cpsr & CPSR_E) ? 1 : 0;
return
#ifdef CONFIG_USER_ONLY
/* In system mode, BE32 is modelled in line with the
* architecture (as word-invariant big-endianness), where loads
* and stores are done little endian but from addresses which
* are adjusted by XORing with the appropriate constant. So the
* endianness to use for the raw data access is not affected by
* SCTLR.B.
* In user mode, however, we model BE32 as byte-invariant
* big-endianness (because user-only code cannot tell the
* difference), and so we need to use a data access endianness
* that depends on SCTLR.B.
*/
arm_sctlr_b(env) ||
#endif
((env->uncached_cpsr & CPSR_E) ? 1 : 0);
}
cur_el = arm_current_el(env);