[RFC PATCH] linux-user: don't adjust base of found hole

[Alex Bennée]

The pgb_find_hole function goes to the trouble of taking account of
both mmap_min_addr and any offset we've applied to decide the starting
address of a potential hole. This is especially important for
emulating 32bit ARM in a 32bit build as we have applied the offset to
ensure there will be space to map the ARM_COMMPAGE bellow the main
guest map (using wrapped arithmetic).

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/690
---
 linux-user/elfload.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/linux-user/elfload.c b/linux-user/elfload.c
index 238979b8b6..8d839b79fb 100644
--- a/linux-user/elfload.c
+++ b/linux-user/elfload.c
@@ -2334,7 +2334,7 @@ static uintptr_t pgb_find_hole(uintptr_t guest_loaddr, 
uintptr_t guest_size,
 
         /* Record the lowest successful match. */
         if (ret < 0) {
-            ret = align_start - guest_loaddr;
+            ret = align_start;
         }
         /* If this hole contains the identity map, select it. */
         if (align_start <= guest_loaddr &&
-- 
2.30.2