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Signed-off-by: Richard Henderson Reviewed-by: Ilya Leoshkevich Reviewed-by: Pierrick Bouvier Acked-by: Helge Deller Message-Id: <20240102015808.132373-9-richard.henderson@linaro.org> --- linux-user/mmap.c | 66 +++++++++++++++++++++++------------------------ 1 file changed, 33 insertions(+), 33 deletions(-) diff --git a/linux-user/mmap.c b/linux-user/mmap.c index 96c9433e27..4d3c8717b9 100644 --- a/linux-user/mmap.c +++ b/linux-user/mmap.c @@ -165,6 +165,7 @@ static int target_to_host_prot(int prot) /* NOTE: all the constants are the HOST ones, but addresses are target. */ int target_mprotect(abi_ulong start, abi_ulong len, int target_prot) { + int host_page_size =3D qemu_real_host_page_size(); abi_ulong starts[3]; abi_ulong lens[3]; int prots[3]; @@ -189,13 +190,13 @@ int target_mprotect(abi_ulong start, abi_ulong len, i= nt target_prot) } =20 last =3D start + len - 1; - host_start =3D start & qemu_host_page_mask; + host_start =3D start & -host_page_size; host_last =3D HOST_PAGE_ALIGN(last) - 1; nranges =3D 0; =20 mmap_lock(); =20 - if (host_last - host_start < qemu_host_page_size) { + if (host_last - host_start < host_page_size) { /* Single host page contains all guest pages: sum the prot. */ prot1 =3D target_prot; for (abi_ulong a =3D host_start; a < start; a +=3D TARGET_PAGE_SIZ= E) { @@ -205,7 +206,7 @@ int target_mprotect(abi_ulong start, abi_ulong len, int= target_prot) prot1 |=3D page_get_flags(a + 1); } starts[nranges] =3D host_start; - lens[nranges] =3D qemu_host_page_size; + lens[nranges] =3D host_page_size; prots[nranges] =3D prot1; nranges++; } else { @@ -218,10 +219,10 @@ int target_mprotect(abi_ulong start, abi_ulong len, i= nt target_prot) /* If the resulting sum differs, create a new range. */ if (prot1 !=3D target_prot) { starts[nranges] =3D host_start; - lens[nranges] =3D qemu_host_page_size; + lens[nranges] =3D host_page_size; prots[nranges] =3D prot1; nranges++; - host_start +=3D qemu_host_page_size; + host_start +=3D host_page_size; } } =20 @@ -233,9 +234,9 @@ int target_mprotect(abi_ulong start, abi_ulong len, int= target_prot) } /* If the resulting sum differs, create a new range. */ if (prot1 !=3D target_prot) { - host_last -=3D qemu_host_page_size; + host_last -=3D host_page_size; starts[nranges] =3D host_last + 1; - lens[nranges] =3D qemu_host_page_size; + lens[nranges] =3D host_page_size; prots[nranges] =3D prot1; nranges++; } @@ -270,6 +271,7 @@ int target_mprotect(abi_ulong start, abi_ulong len, int= target_prot) static bool mmap_frag(abi_ulong real_start, abi_ulong start, abi_ulong las= t, int prot, int flags, int fd, off_t offset) { + int host_page_size =3D qemu_real_host_page_size(); abi_ulong real_last; void *host_start; int prot_old, prot_new; @@ -286,7 +288,7 @@ static bool mmap_frag(abi_ulong real_start, abi_ulong s= tart, abi_ulong last, return false; } =20 - real_last =3D real_start + qemu_host_page_size - 1; + real_last =3D real_start + host_page_size - 1; host_start =3D g2h_untagged(real_start); =20 /* Get the protection of the target pages outside the mapping. */ @@ -304,12 +306,12 @@ static bool mmap_frag(abi_ulong real_start, abi_ulong= start, abi_ulong last, * outside of the fragment we need to map. Allocate a new host * page to cover, discarding whatever else may have been present. */ - void *p =3D mmap(host_start, qemu_host_page_size, + void *p =3D mmap(host_start, host_page_size, target_to_host_prot(prot), flags | MAP_ANONYMOUS, -1, 0); if (p !=3D host_start) { if (p !=3D MAP_FAILED) { - munmap(p, qemu_host_page_size); + munmap(p, host_page_size); errno =3D EEXIST; } return false; @@ -324,7 +326,7 @@ static bool mmap_frag(abi_ulong real_start, abi_ulong s= tart, abi_ulong last, /* Adjust protection to be able to write. */ if (!(host_prot_old & PROT_WRITE)) { host_prot_old |=3D PROT_WRITE; - mprotect(host_start, qemu_host_page_size, host_prot_old); + mprotect(host_start, host_page_size, host_prot_old); } =20 /* Read or zero the new guest pages. */ @@ -338,7 +340,7 @@ static bool mmap_frag(abi_ulong real_start, abi_ulong s= tart, abi_ulong last, =20 /* Put final protection */ if (host_prot_new !=3D host_prot_old) { - mprotect(host_start, qemu_host_page_size, host_prot_new); + mprotect(host_start, host_page_size, host_prot_new); } return true; } @@ -373,17 +375,18 @@ static abi_ulong mmap_find_vma_reserved(abi_ulong sta= rt, abi_ulong size, */ abi_ulong mmap_find_vma(abi_ulong start, abi_ulong size, abi_ulong align) { + int host_page_size =3D qemu_real_host_page_size(); void *ptr, *prev; abi_ulong addr; int wrapped, repeat; =20 - align =3D MAX(align, qemu_host_page_size); + align =3D MAX(align, host_page_size); =20 /* If 'start' =3D=3D 0, then a default start address is used. */ if (start =3D=3D 0) { start =3D mmap_next_start; } else { - start &=3D qemu_host_page_mask; + start &=3D -host_page_size; } start =3D ROUND_UP(start, align); =20 @@ -492,6 +495,7 @@ abi_ulong mmap_find_vma(abi_ulong start, abi_ulong size= , abi_ulong align) abi_long target_mmap(abi_ulong start, abi_ulong len, int target_prot, int flags, int fd, off_t offset) { + int host_page_size =3D qemu_real_host_page_size(); abi_ulong ret, last, real_start, real_last, retaddr, host_len; abi_ulong passthrough_start =3D -1, passthrough_last =3D 0; int page_flags; @@ -537,8 +541,8 @@ abi_long target_mmap(abi_ulong start, abi_ulong len, in= t target_prot, } } =20 - real_start =3D start & qemu_host_page_mask; - host_offset =3D offset & qemu_host_page_mask; + real_start =3D start & -host_page_size; + host_offset =3D offset & -host_page_size; =20 /* * If the user is asking for the kernel to find a location, do that @@ -567,8 +571,7 @@ abi_long target_mmap(abi_ulong start, abi_ulong len, in= t target_prot, * may need to truncate file maps at EOF and add extra anonymous pages * up to the targets page boundary. */ - if ((qemu_real_host_page_size() < qemu_host_page_size) && - !(flags & MAP_ANONYMOUS)) { + if (host_page_size < TARGET_PAGE_SIZE && !(flags & MAP_ANONYMOUS)) { struct stat sb; =20 if (fstat(fd, &sb) =3D=3D -1) { @@ -595,11 +598,7 @@ abi_long target_mmap(abi_ulong start, abi_ulong len, i= nt target_prot, host_len =3D HOST_PAGE_ALIGN(host_len); host_prot =3D target_to_host_prot(target_prot); =20 - /* - * Note: we prefer to control the mapping address. It is - * especially important if qemu_host_page_size > - * qemu_real_host_page_size. - */ + /* Note: we prefer to control the mapping address. */ p =3D mmap(g2h_untagged(start), host_len, host_prot, flags | MAP_FIXED | MAP_ANONYMOUS, -1, 0); if (p =3D=3D MAP_FAILED) { @@ -665,7 +664,7 @@ abi_long target_mmap(abi_ulong start, abi_ulong len, in= t target_prot, * aligned, so we read it */ if (!(flags & MAP_ANONYMOUS) && - (offset & ~qemu_host_page_mask) !=3D (start & ~qemu_host_page_= mask)) { + (offset & (host_page_size - 1)) !=3D (start & (host_page_size = - 1))) { /* * msync() won't work here, so we return an error if write is * possible while it is a shared mapping @@ -694,7 +693,7 @@ abi_long target_mmap(abi_ulong start, abi_ulong len, in= t target_prot, =20 /* handle the start of the mapping */ if (start > real_start) { - if (real_last =3D=3D real_start + qemu_host_page_size - 1) { + if (real_last =3D=3D real_start + host_page_size - 1) { /* one single host page */ if (!mmap_frag(real_start, start, last, target_prot, flags, fd, offset)) { @@ -703,21 +702,21 @@ abi_long target_mmap(abi_ulong start, abi_ulong len, = int target_prot, goto the_end1; } if (!mmap_frag(real_start, start, - real_start + qemu_host_page_size - 1, + real_start + host_page_size - 1, target_prot, flags, fd, offset)) { goto fail; } - real_start +=3D qemu_host_page_size; + real_start +=3D host_page_size; } /* handle the end of the mapping */ if (last < real_last) { - abi_ulong real_page =3D real_last - qemu_host_page_size + 1; + abi_ulong real_page =3D real_last - host_page_size + 1; if (!mmap_frag(real_page, real_page, last, target_prot, flags, fd, offset + real_page - start)) { goto fail; } - real_last -=3D qemu_host_page_size; + real_last -=3D host_page_size; } =20 /* map the middle (easier) */ @@ -784,6 +783,7 @@ fail: =20 static int mmap_reserve_or_unmap(abi_ulong start, abi_ulong len) { + int host_page_size =3D qemu_real_host_page_size(); abi_ulong real_start; abi_ulong real_last; abi_ulong real_len; @@ -793,7 +793,7 @@ static int mmap_reserve_or_unmap(abi_ulong start, abi_u= long len) int prot; =20 last =3D start + len - 1; - real_start =3D start & qemu_host_page_mask; + real_start =3D start & -host_page_size; real_last =3D HOST_PAGE_ALIGN(last) - 1; =20 /* @@ -802,7 +802,7 @@ static int mmap_reserve_or_unmap(abi_ulong start, abi_u= long len) * The single page special case is required for the last page, * lest real_start overflow to zero. */ - if (real_last - real_start < qemu_host_page_size) { + if (real_last - real_start < host_page_size) { prot =3D 0; for (a =3D real_start; a < start; a +=3D TARGET_PAGE_SIZE) { prot |=3D page_get_flags(a); @@ -818,14 +818,14 @@ static int mmap_reserve_or_unmap(abi_ulong start, abi= _ulong len) prot |=3D page_get_flags(a); } if (prot !=3D 0) { - real_start +=3D qemu_host_page_size; + real_start +=3D host_page_size; } =20 for (prot =3D 0, a =3D last; a < real_last; a +=3D TARGET_PAGE_SIZ= E) { prot |=3D page_get_flags(a + 1); } if (prot !=3D 0) { - real_last -=3D qemu_host_page_size; + real_last -=3D host_page_size; } =20 if (real_last < real_start) { --=20 2.34.1