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accel/tcg: Simplify page_get/alloc_target_data

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Since the only user, Arm MTE, always requires allocation,
merge the get and alloc functions to always produce a
non-null result.  Also assume that the user has already
checked page validity.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2022-10-04 15:40:22 -07:00
parent 0fe6108432
commit 8269c01417
3 changed files with 10 additions and 31 deletions
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16
accel/tcg/user-exec.c
View File

@ -242,19 +242,11 @@ void page_reset_target_data(target_ulong start, target_ulong end)
void *page_get_target_data(target_ulong address)
{
PageDesc *p = page_find(address >> TARGET_PAGE_BITS);
return p ? p->target_data : NULL;
}
void *ret = p->target_data;
void *page_alloc_target_data(target_ulong address)
{
PageDesc *p = page_find(address >> TARGET_PAGE_BITS);
void *ret = NULL;
if (p->flags & PAGE_VALID) {
ret = p->target_data;
if (!ret) {
p->target_data = ret = g_malloc0(TARGET_PAGE_DATA_SIZE);
}
if (!ret) {
ret = g_malloc0(TARGET_PAGE_DATA_SIZE);
p->target_data = ret;
}
return ret;
}

21
include/exec/cpu-all.h
View File

@ -281,27 +281,18 @@ void page_reset_target_data(target_ulong start, target_ulong end);
int page_check_range(target_ulong start, target_ulong len, int flags);
/**
* page_alloc_target_data(address)
* page_get_target_data(address)
* @address: guest virtual address
*
* Allocate TARGET_PAGE_DATA_SIZE bytes of out-of-band data to associate
* with the guest page at @address. If the page is not mapped, NULL will
* be returned. If there is existing data associated with @address,
* no new memory will be allocated.
* Return TARGET_PAGE_DATA_SIZE bytes of out-of-band data to associate
* with the guest page at @address, allocating it if necessary. The
* caller should already have verified that the address is valid.
*
* The memory will be freed when the guest page is deallocated,
* e.g. with the munmap system call.
*/
void *page_alloc_target_data(target_ulong address);
/**
* page_get_target_data(address)
* @address: guest virtual address
*
* Return any out-of-bound memory assocated with the guest page
* at @address, as per page_alloc_target_data.
*/
void *page_get_target_data(target_ulong address);
void *page_get_target_data(target_ulong address)
__attribute__((returns_nonnull));
#endif
CPUArchState *cpu_copy(CPUArchState *env);

4
target/arm/mte_helper.c
View File

@ -95,10 +95,6 @@ static uint8_t *allocation_tag_mem(CPUARMState *env, int ptr_mmu_idx,
}
tags = page_get_target_data(clean_ptr);
if (tags == NULL) {
tags = page_alloc_target_data(clean_ptr);
assert(tags != NULL);
}
index = extract32(ptr, LOG2_TAG_GRANULE + 1,
TARGET_PAGE_BITS - LOG2_TAG_GRANULE - 1);