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Fix BE32 usermode address XOR

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lazymio
2022-04-05 11:55:58 +02:00
parent 7e64e620d2
commit e3d0a33ab8
3 changed files with 38 additions and 8 deletions
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10
qemu/target/arm/cpu.c
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@@ -2167,17 +2167,17 @@ ARMCPU *cpu_arm_init(struct uc_struct *uc)
qemu_init_vcpu(cs);
// UC_MODE_BIG_ENDIAN means big endian code and big endian
// data (BE32), which is only supported before ARMv7-A.
// UC_MODE_BIG_ENDIAN means big endian code and big endian data (BE32), which
// is only supported before ARMv7-A (and it only makes sense in qemu usermode!).
//
// UC_MODE_ARMBE8 shouldn't exist in fact. We do this for
// UC_MODE_ARMBE8 & BE32 difference shouldn't exist in fact. We do this for
// backward compatibility.
//
// UC_MODE_ARMBE8 -> little endian code, big endian data
// UC_MODE_ARMBE8 | UC_MODE_BIG_ENDIAN -> big endian code, big endian data
//
// In QEMU, all arm instruction fetch **should be** little endian, however
// we hack it to support BE32.
// In QEMU system, all arm instruction fetch **should be** little endian, however
// we hack it to support (usermode) BE32.
//
// Reference:
// https://developer.arm.com/documentation/ddi0406/c/Application-Level-Architecture/Application-Level-Memory-Model/Endian-support/Instruction-endianness?lang=en