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accel/tcg: Return bool from page_check_range 

Replace the 0/-1 result with true/false.
Invert the sense of the test of all callers.
Document the function.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20230707204054.8792-25-richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2023-07-07 21:40:52 +01:00
parent 91e9e116fe
commit bef6f008b9
9 changed files with 31 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
accel/tcg/ldst_atomicity.c.inc
View File

@ -159,7 +159,7 @@ static uint64_t load_atomic8_or_exit(CPUArchState *env, uintptr_t ra, void *pv)
* another process, because the fallback start_exclusive solution
* provides no protection across processes.
*/
if (!page_check_range(h2g(pv), 8, PAGE_WRITE_ORG)) {
if (page_check_range(h2g(pv), 8, PAGE_WRITE_ORG)) {
uint64_t *p = __builtin_assume_aligned(pv, 8);
return *p;
}
@ -194,7 +194,7 @@ static Int128 load_atomic16_or_exit(CPUArchState *env, uintptr_t ra, void *pv)
* another process, because the fallback start_exclusive solution
* provides no protection across processes.
*/
if (!page_check_range(h2g(p), 16, PAGE_WRITE_ORG)) {
if (page_check_range(h2g(p), 16, PAGE_WRITE_ORG)) {
return *p;
}
#endif

22
accel/tcg/user-exec.c
View File

@ -520,19 +520,19 @@ void page_set_flags(target_ulong start, target_ulong last, int flags)
}
}
int page_check_range(target_ulong start, target_ulong len, int flags)
bool page_check_range(target_ulong start, target_ulong len, int flags)
{
target_ulong last;
int locked; /* tri-state: =0: unlocked, +1: global, -1: local */
int ret;
bool ret;
if (len == 0) {
return 0; /* trivial length */
return true; /* trivial length */
}
last = start + len - 1;
if (last < start) {
return -1; /* wrap around */
return false; /* wrap around */
}
locked = have_mmap_lock();
@ -551,33 +551,33 @@ int page_check_range(target_ulong start, target_ulong len, int flags)
p = pageflags_find(start, last);
}
if (!p) {
ret = -1; /* entire region invalid */
ret = false; /* entire region invalid */
break;
}
}
if (start < p->itree.start) {
ret = -1; /* initial bytes invalid */
ret = false; /* initial bytes invalid */
break;
}
missing = flags & ~p->flags;
if (missing & ~PAGE_WRITE) {
ret = -1; /* page doesn't match */
ret = false; /* page doesn't match */
break;
}
if (missing & PAGE_WRITE) {
if (!(p->flags & PAGE_WRITE_ORG)) {
ret = -1; /* page not writable */
ret = false; /* page not writable */
break;
}
/* Asking about writable, but has been protected: undo. */
if (!page_unprotect(start, 0)) {
ret = -1;
ret = false;
break;
}
/* TODO: page_unprotect should take a range, not a single page. */
if (last - start < TARGET_PAGE_SIZE) {
ret = 0; /* ok */
ret = true; /* ok */
break;
}
start += TARGET_PAGE_SIZE;
@ -585,7 +585,7 @@ int page_check_range(target_ulong start, target_ulong len, int flags)
}
if (last <= p->itree.last) {
ret = 0; /* ok */
ret = true; /* ok */
break;
}
start = p->itree.last + 1;

2
bsd-user/qemu.h
View File

@ -267,7 +267,7 @@ abi_long do_freebsd_sysarch(void *cpu_env, abi_long arg1, abi_long arg2);
static inline bool access_ok(int type, abi_ulong addr, abi_ulong size)
{
return page_check_range((target_ulong)addr, size, type) == 0;
return page_check_range((target_ulong)addr, size, type);
}
/*

13
include/exec/cpu-all.h
View File

@ -222,7 +222,18 @@ int walk_memory_regions(void *, walk_memory_regions_fn);
int page_get_flags(target_ulong address);
void page_set_flags(target_ulong start, target_ulong last, int flags);
void page_reset_target_data(target_ulong start, target_ulong last);
int page_check_range(target_ulong start, target_ulong len, int flags);
/**
* page_check_range
* @start: first byte of range
* @len: length of range
* @flags: flags required for each page
*
* Return true if every page in [@start, @start+@len) has @flags set.
* Return false if any page is unmapped. Thus testing flags == 0 is
* equivalent to testing for flags == PAGE_VALID.
*/
bool page_check_range(target_ulong start, target_ulong last, int flags);
/**
* page_check_range_empty:

2
linux-user/qemu.h
View File

@ -182,7 +182,7 @@ static inline bool access_ok_untagged(int type, abi_ulong addr, abi_ulong size)
: !guest_range_valid_untagged(addr, size)) {
return false;
}
return page_check_range((target_ulong)addr, size, type) == 0;
return page_check_range((target_ulong)addr, size, type);
}
static inline bool access_ok(CPUState *cpu, int type,

2
linux-user/syscall.c
View File

@ -8122,7 +8122,7 @@ static int open_self_maps_1(CPUArchState *cpu_env, int fd, bool smaps)
max = h2g_valid(max - 1) ?
max : (uintptr_t) g2h_untagged(GUEST_ADDR_MAX) + 1;
if (page_check_range(h2g(min), max - min, flags) == -1) {
if (!page_check_range(h2g(min), max - min, flags)) {
continue;
}

2
target/hppa/op_helper.c
View File

@ -168,7 +168,7 @@ target_ureg HELPER(probe)(CPUHPPAState *env, target_ulong addr,
uint32_t level, uint32_t want)
{
#ifdef CONFIG_USER_ONLY
return (page_check_range(addr, 1, want) == 0) ? 1 : 0;
return page_check_range(addr, 1, want);
#else
int prot, excp;
hwaddr phys;

2
target/riscv/vector_helper.c
View File

@ -583,7 +583,7 @@ vext_ldff(void *vd, void *v0, target_ulong base,
cpu_mmu_index(env, false));
if (host) {
#ifdef CONFIG_USER_ONLY
if (page_check_range(addr, offset, PAGE_READ) < 0) {
if (page_check_range(addr, offset, PAGE_READ)) {
vl = i;
goto ProbeSuccess;
}

2
target/sparc/ldst_helper.c
View File

@ -1191,7 +1191,7 @@ uint64_t helper_ld_asi(CPUSPARCState *env, target_ulong addr,
case ASI_PNFL: /* Primary no-fault LE */
case ASI_SNF: /* Secondary no-fault */
case ASI_SNFL: /* Secondary no-fault LE */
if (page_check_range(addr, size, PAGE_READ) == -1) {
if (!page_check_range(addr, size, PAGE_READ)) {
ret = 0;
break;
}