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[Qemu-devel] [PULL v2 07/15] linux-user/arm: Adjust MAX_RESERVED_VA for
From: |
Laurent Vivier |
Subject: |
[Qemu-devel] [PULL v2 07/15] linux-user/arm: Adjust MAX_RESERVED_VA for M-profile |
Date: |
Wed, 11 Sep 2019 08:49:12 +0200 |
From: Richard Henderson <address@hidden>
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 <address@hidden>
Reviewed-by: Peter Maydell <address@hidden>
Message-Id: <address@hidden>
Signed-off-by: Laurent Vivier <address@hidden>
---
linux-user/arm/target_cpu.h | 24 +++++++++++++++++++++---
1 file changed, 21 insertions(+), 3 deletions(-)
diff --git a/linux-user/arm/target_cpu.h b/linux-user/arm/target_cpu.h
index 279ea532d5b7..3f79356a07fc 100644
--- a/linux-user/arm/target_cpu.h
+++ b/linux-user/arm/target_cpu.h
@@ -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)
{
--
2.21.0
- [Qemu-devel] [PULL v2 00/15] Linux user for 4.2 patches, Laurent Vivier, 2019/09/11
- [Qemu-devel] [PULL v2 02/15] linux-user: Add AT_HWCAP2 for aarch64-linux-user, Laurent Vivier, 2019/09/11
- [Qemu-devel] [PULL v2 03/15] linux-user: erroneous fd_trans_unregister call, Laurent Vivier, 2019/09/11
- [Qemu-devel] [PULL v2 04/15] linux-user: fail and report on bad dfilter specs, Laurent Vivier, 2019/09/11
- [Qemu-devel] [PULL v2 07/15] linux-user/arm: Adjust MAX_RESERVED_VA for M-profile,
Laurent Vivier <=
- [Qemu-devel] [PULL v2 13/15] linux-user: Add support for FDFLUSH ioctl, Laurent Vivier, 2019/09/11
- [Qemu-devel] [PULL v2 05/15] linux-user: add memfd_create, Laurent Vivier, 2019/09/11
- [Qemu-devel] [PULL v2 06/15] linux-user: Pass CPUState to MAX_RESERVED_VA, Laurent Vivier, 2019/09/11
- [Qemu-devel] [PULL v2 08/15] linux-user: Support gdb 'qOffsets' query for ELF, Laurent Vivier, 2019/09/11
- [Qemu-devel] [PULL v2 09/15] target/xtensa: linux-user: add call0 ABI support, Laurent Vivier, 2019/09/11
- [Qemu-devel] [PULL v2 11/15] linux-user: Add support for RNDRESEEDCRNG ioctl, Laurent Vivier, 2019/09/11
- [Qemu-devel] [PULL v2 01/15] linux-user: remove useless variable, Laurent Vivier, 2019/09/11
- [Qemu-devel] [PULL v2 10/15] linux-user: drop redundant handling of environment variables, Laurent Vivier, 2019/09/11
- [Qemu-devel] [PULL v2 12/15] linux-user: Add support for FIOGETOWN and FIOSETOWN ioctls, Laurent Vivier, 2019/09/11
- [Qemu-devel] [PULL v2 15/15] linux-user: Add support for FDRESET, FDRAWCMD, FDTWADDLE, and FDEJECT ioctls, Laurent Vivier, 2019/09/11