Remember the PROT_MTE bit as PAGE_MTE/PAGE_TARGET_2.
Otherwise this does not yet have effect.
Reviewed-by: Peter Maydell <peter.mayd...@linaro.org>
Signed-off-by: Richard Henderson <richard.hender...@linaro.org>
---
v3: Do not overlap PAGE_TARGET_2 with PAGE_RESERVED.
---
include/exec/cpu-all.h | 1 +
linux-user/syscall_defs.h | 1 +
target/arm/cpu.h | 1 +
linux-user/mmap.c | 22 ++++++++++++++--------
4 files changed, 17 insertions(+), 8 deletions(-)
diff --git a/include/exec/cpu-all.h b/include/exec/cpu-all.h
index c52180e8e6..b2a72f70ec 100644
--- a/include/exec/cpu-all.h
+++ b/include/exec/cpu-all.h
@@ -284,6 +284,7 @@ extern intptr_t qemu_host_page_mask;
#endif
/* Target-specific bits that will be used via page_get_flags(). */
#define PAGE_TARGET_1 0x0080
+#define PAGE_TARGET_2 0x0200
#if defined(CONFIG_USER_ONLY)
void page_dump(FILE *f);
diff --git a/linux-user/syscall_defs.h b/linux-user/syscall_defs.h
index f98c1c1c8d..46a960fccb 100644
--- a/linux-user/syscall_defs.h
+++ b/linux-user/syscall_defs.h
@@ -1311,6 +1311,7 @@ struct target_winsize {
#ifdef TARGET_AARCH64
#define TARGET_PROT_BTI 0x10
+#define TARGET_PROT_MTE 0x20
#endif
/* Common */
diff --git a/target/arm/cpu.h b/target/arm/cpu.h
index 0db6e65467..7a79dde6f6 100644
--- a/target/arm/cpu.h
+++ b/target/arm/cpu.h
@@ -3605,6 +3605,7 @@ static inline MemTxAttrs *typecheck_memtxattrs(MemTxAttrs
*x)
* AArch64 usage of the PAGE_TARGET_* bits for linux-user.
*/
#define PAGE_BTI PAGE_TARGET_1
+#define PAGE_MTE PAGE_TARGET_2
#ifdef TARGET_TAGGED_ADDRESSES
/**
diff --git a/linux-user/mmap.c b/linux-user/mmap.c
index 7fb4c628e1..34bd114f97 100644
--- a/linux-user/mmap.c
+++ b/linux-user/mmap.c
@@ -84,18 +84,24 @@ static int validate_prot_to_pageflags(int *host_prot, int
prot)
| (prot & PROT_EXEC ? PROT_READ : 0);
#ifdef TARGET_AARCH64
- /*
- * The PROT_BTI bit is only accepted if the cpu supports the feature.
- * Since this is the unusual case, don't bother checking unless
- * the bit has been requested. If set and valid, record the bit
- * within QEMU's page_flags.
- */
- if (prot & TARGET_PROT_BTI) {
+ {
ARMCPU *cpu = ARM_CPU(thread_cpu);
- if (cpu_isar_feature(aa64_bti, cpu)) {
+
+ /*
+ * The PROT_BTI bit is only accepted if the cpu supports the feature.
+ * Since this is the unusual case, don't bother checking unless
+ * the bit has been requested. If set and valid, record the bit
+ * within QEMU's page_flags.
+ */
+ if ((prot & TARGET_PROT_BTI) && cpu_isar_feature(aa64_bti, cpu)) {
valid |= TARGET_PROT_BTI;
page_flags |= PAGE_BTI;
}
+ /* Similarly for the PROT_MTE bit. */
+ if ((prot & TARGET_PROT_MTE) && cpu_isar_feature(aa64_mte, cpu)) {
+ valid |= TARGET_PROT_MTE;
+ page_flags |= PAGE_MTE;
+ }
}
#endif
--
2.25.1
