Transform the prot bit to a qemu internal page bit, and save
it in the page tables.
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id:
20201021173749.111103-3-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
/* FIXME: Code that sets/uses this is broken and needs to go away. */
#define PAGE_RESERVED 0x0020
#endif
+/* Target-specific bits that will be used via page_get_flags(). */
+#define PAGE_TARGET_1 0x0080
#if defined(CONFIG_USER_ONLY)
void page_dump(FILE *f);
*host_prot = (prot & (PROT_READ | PROT_WRITE))
| (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)) {
+ valid |= TARGET_PROT_BTI;
+ page_flags |= PAGE_BTI;
+ }
+ }
+#endif
+
return prot & ~valid ? 0 : page_flags;
}
#define TARGET_PROT_SEM 0x08
#endif
+#ifdef TARGET_AARCH64
+#define TARGET_PROT_BTI 0x10
+#endif
+
/* Common */
#define TARGET_MAP_SHARED 0x01 /* Share changes */
#define TARGET_MAP_PRIVATE 0x02 /* Changes are private */
#define arm_tlb_mte_tagged(x) (typecheck_memtxattrs(x)->target_tlb_bit1)
/*
+ * AArch64 usage of the PAGE_TARGET_* bits for linux-user.
+ */
+#define PAGE_BTI PAGE_TARGET_1
+
+/*
* Naming convention for isar_feature functions:
* Functions which test 32-bit ID registers should have _aa32_ in
* their name. Functions which test 64-bit ID registers should have
*/
static bool is_guarded_page(CPUARMState *env, DisasContext *s)
{
+ uint64_t addr = s->base.pc_first;
#ifdef CONFIG_USER_ONLY
- return false; /* FIXME */
+ return page_get_flags(addr) & PAGE_BTI;
#else
- uint64_t addr = s->base.pc_first;
int mmu_idx = arm_to_core_mmu_idx(s->mmu_idx);
unsigned int index = tlb_index(env, mmu_idx, addr);
CPUTLBEntry *entry = tlb_entry(env, mmu_idx, addr);