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linux-user/aarch64: Implement PROT_MTE

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Remember the PROT_MTE bit as PAGE_MTE/PAGE_TARGET_2.
Otherwise this does not yet have effect.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20210212184902.1251044-25-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Richard Henderson 2021-02-12 10:48:55 -08:00 committed by Peter Maydell
parent bfd0572f43
commit d109b46d8d
4 changed files with 17 additions and 8 deletions
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1
include/exec/cpu-all.h
View File

@ -276,6 +276,7 @@ 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);

22
linux-user/mmap.c
View File

@ -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

1
linux-user/syscall_defs.h
View File

@ -1311,6 +1311,7 @@ struct target_winsize {
#ifdef TARGET_AARCH64
#define TARGET_PROT_BTI 0x10
#define TARGET_PROT_MTE 0x20
#endif
/* Common */

1
target/arm/cpu.h
View File

@ -3608,6 +3608,7 @@ 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
/**