Merge tag 'pull-tcg-20240301' of https://gitlab.com/rth7680/qemu into staging

linux-user: Rewrite elf coredump
tcg/aarch64: Apple does not align __int128_t in even registers
accel/tcg: Fixes for page tables in mmio memory
linux-user: Remove qemu_host_page_{size,mask}, HOST_PAGE_ALIGN
migration: Remove qemu_host_page_size
hw/tpm: Remove qemu_host_page_size
softmmu: Remove qemu_host_page_{size,mask}, HOST_PAGE_ALIGN
linux-user: Split and reorganize target_mmap.
*-user: Deprecate and disable -p pagesize
linux-user: Allow TARGET_PAGE_BITS_VARY
target/alpha: Enable TARGET_PAGE_BITS_VARY for user-only
target/arm: Enable TARGET_PAGE_BITS_VARY for AArch64 user-only
target/ppc: Enable TARGET_PAGE_BITS_VARY for user-only
linux-user: Remove pgb_dynamic alignment assertion
tcg/optimize: fix uninitialized variable
linux-user: Rewrite shmat

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* tag 'pull-tcg-20240301' of https://gitlab.com/rth7680/qemu: (60 commits)
  tests/tcg: Check that shmat() does not break /proc/self/maps
  linux-user: Rewrite target_shmat
  linux-user: Add strace for shmat
  linux-user/loongarch64: Remove TARGET_FORCE_SHMLBA
  linux-user/x86_64: Handle the vsyscall page in open_self_maps_{2,4}
  tcg/optimize: fix uninitialized variable
  linux-user: Remove pgb_dynamic alignment assertion
  target/alpha: Enable TARGET_PAGE_BITS_VARY for user-only
  target/ppc: Enable TARGET_PAGE_BITS_VARY for user-only
  linux-user: Bound mmap_min_addr by host page size
  target/arm: Enable TARGET_PAGE_BITS_VARY for AArch64 user-only
  linux-user: Allow TARGET_PAGE_BITS_VARY
  accel/tcg: Disconnect TargetPageDataNode from page size
  cpu: Remove page_size_init
  *-user: Deprecate and disable -p pagesize
  tests/tcg: Extend file in linux-madvise.c
  tests/tcg: Remove run-test-mmap-*
  linux-user: Split out mmap_h_gt_g
  linux-user: Split out mmap_h_lt_g
  linux-user: Split out mmap_h_eq_g
  ...

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 16 insertions, 0 deletions

diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index e384e14248..bc8c06522f 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -7994,6 +7994,10 @@ static void open_self_maps_4(const struct open_self_maps_data *d,
         path = "[heap]";
     } else if (start == info->vdso) {
         path = "[vdso]";
+#ifdef TARGET_X86_64
+    } else if (start == TARGET_VSYSCALL_PAGE) {
+        path = "[vsyscall]";
+#endif
     }
 
     /* Except null device (MAP_ANON), adjust offset for this fragment. */
@@ -8082,6 +8086,18 @@ static int open_self_maps_2(void *opaque, target_ulong guest_start,
     uintptr_t host_start = (uintptr_t)g2h_untagged(guest_start);
     uintptr_t host_last = (uintptr_t)g2h_untagged(guest_end - 1);
 
+#ifdef TARGET_X86_64
+    /*
+     * Because of the extremely high position of the page within the guest
+     * virtual address space, this is not backed by host memory at all.
+     * Therefore the loop below would fail.  This is the only instance
+     * of not having host backing memory.
+     */
+    if (guest_start == TARGET_VSYSCALL_PAGE) {
+        return open_self_maps_3(opaque, guest_start, guest_end, flags);
+    }
+#endif
+
     while (1) {
         IntervalTreeNode *n =
             interval_tree_iter_first(d->host_maps, host_start, host_start);