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bsd-user: Propagate alignment argument to mmap_find_vma()

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Propagate the alignment to mmap_find_vma(), effectively
embedding mmap_find_vma_aligned() within mmap_find_vma().

Add a comment in do_bsd_shmat() to clarify alignment above
page size is not required.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Warner Losh <imp@bsdimp.com>
Message-Id: <20250308122842.76377-3-philmd@linaro.org>
This commit is contained in:
Philippe Mathieu-Daudé 2025-03-07 13:47:21 +01:00
parent 019b4e84ed
commit 84d66261be
3 changed files with 6 additions and 10 deletions
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4
bsd-user/bsd-mem.h
View file

@ -370,9 +370,11 @@ static inline abi_long do_bsd_shmat(int shmid, abi_ulong shmaddr, int shmflg)
if (shmaddr) {
host_raddr = shmat(shmid, (void *)g2h_untagged(shmaddr), shmflg);
} else {
abi_ulong alignment;
abi_ulong mmap_start;
mmap_start = mmap_find_vma(0, shm_info.shm_segsz);
alignment = 0; /* alignment above page size not required */
mmap_start = mmap_find_vma(0, shm_info.shm_segsz, alignment);
if (mmap_start == -1) {
return -TARGET_ENOMEM;

10
bsd-user/mmap.c
View file

@ -275,8 +275,7 @@ static abi_ulong mmap_find_vma_reserved(abi_ulong start, abi_ulong size,
* It must be called with mmap_lock() held.
* Return -1 if error.
*/
static abi_ulong mmap_find_vma_aligned(abi_ulong start, abi_ulong size,
abi_ulong alignment)
abi_ulong mmap_find_vma(abi_ulong start, abi_ulong size, abi_ulong alignment)
{
void *ptr, *prev;
abi_ulong addr;
@ -395,11 +394,6 @@ static abi_ulong mmap_find_vma_aligned(abi_ulong start, abi_ulong size,
}
}
abi_ulong mmap_find_vma(abi_ulong start, abi_ulong size)
{
return mmap_find_vma_aligned(start, size, 0);
}
/* NOTE: all the constants are the HOST ones */
abi_long target_mmap(abi_ulong start, abi_ulong len, int prot,
int flags, int fd, off_t offset)
@ -494,7 +488,7 @@ abi_long target_mmap(abi_ulong start, abi_ulong len, int prot,
host_len = len + offset - host_offset;
host_len = HOST_PAGE_ALIGN(host_len);
alignment = (flags & MAP_ALIGNMENT_MASK) >> MAP_ALIGNMENT_SHIFT;
start = mmap_find_vma_aligned(real_start, host_len, alignment);
start = mmap_find_vma(real_start, host_len, alignment);
if (start == (abi_ulong)-1) {
errno = ENOMEM;
goto fail;

2
bsd-user/qemu.h
View file

@ -242,7 +242,7 @@ abi_long target_mremap(abi_ulong old_addr, abi_ulong old_size,
abi_ulong new_addr);
int target_msync(abi_ulong start, abi_ulong len, int flags);
extern abi_ulong mmap_next_start;
abi_ulong mmap_find_vma(abi_ulong start, abi_ulong size);
abi_ulong mmap_find_vma(abi_ulong start, abi_ulong size, abi_ulong alignment);
void mmap_reserve(abi_ulong start, abi_ulong size);
void TSA_NO_TSA mmap_fork_start(void);
void TSA_NO_TSA mmap_fork_end(int child);