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linux-user/arm: Adjust MAX_RESERVED_VA for M-profile

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Limit the virtual address space for M-profile cpus to 2GB,
so that we avoid all of the magic addresses in the top half
of the M-profile system map.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-Id: <20190822185929.16891-3-richard.henderson@linaro.org>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This commit is contained in:
Richard Henderson 2019-08-22 11:59:29 -07:00 committed by Laurent Vivier
parent 8f67b9c694
commit 0b689da375
1 changed files with 21 additions and 3 deletions
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24
linux-user/arm/target_cpu.h
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@ -19,9 +19,27 @@
#ifndef ARM_TARGET_CPU_H
#define ARM_TARGET_CPU_H
/* We need to be able to map the commpage.
See validate_guest_space in linux-user/elfload.c. */
#define MAX_RESERVED_VA(CPU) 0xffff0000ul
static inline unsigned long arm_max_reserved_va(CPUState *cs)
{
ARMCPU *cpu = ARM_CPU(cs);
if (arm_feature(&cpu->env, ARM_FEATURE_M)) {
/*
* There are magic return addresses above 0xfe000000,
* and in general a lot of M-profile system stuff in
* the high addresses. Restrict linux-user to the
* cached write-back RAM in the system map.
*/
return 0x80000000ul;
} else {
/*
* We need to be able to map the commpage.
* See validate_guest_space in linux-user/elfload.c.
*/
return 0xffff0000ul;
}
}
#define MAX_RESERVED_VA arm_max_reserved_va
static inline void cpu_clone_regs(CPUARMState *env, target_ulong newsp)
{