diff options
Diffstat (limited to 'libre/qemu-user-static/0010-linux-user-init_guest_space-Try-to-make-ARM-space-co.patch')
| -rw-r--r-- | libre/qemu-user-static/0010-linux-user-init_guest_space-Try-to-make-ARM-space-co.patch | 99 |
1 files changed, 0 insertions, 99 deletions
diff --git a/libre/qemu-user-static/0010-linux-user-init_guest_space-Try-to-make-ARM-space-co.patch b/libre/qemu-user-static/0010-linux-user-init_guest_space-Try-to-make-ARM-space-co.patch deleted file mode 100644 index 587293564..000000000 --- a/libre/qemu-user-static/0010-linux-user-init_guest_space-Try-to-make-ARM-space-co.patch +++ /dev/null @@ -1,99 +0,0 @@ -From f8ccd5e7353937e0a48ccd8bfbc07202dc85afac Mon Sep 17 00:00:00 2001 -From: Luke Shumaker <lukeshu@parabola.nu> -Date: Thu, 28 Dec 2017 07:27:20 -0500 -Cc: paul@codesourcery.com -Subject: [PATCH 10/10] linux-user: init_guest_space: Try to make ARM - space+commpage continuous - -At a fixed distance after the usable memory that init_guest_space maps, for -32-bit ARM targets we also need to map a commpage. The normal -init_guest_space logic doesn't keep this in mind when searching for an -address range. - -If !host_start, then try to find a big continuous segment where we can put -both the usable memory and the commpage; we then munmap that segment and -set current_start to that address; and let the normal code mmap the usable -memory and the commpage separately. That is: if we don't have hint of -where to start looking for memory, come up with one that is better than -NULL. Depending on host_size and guest_start, there may or may not be a -gap between the usable memory and the commpage, so this is slightly more -restrictive than it needs to be; but it's only a hint, so that's OK. - -We only do that for !host start, because if host_start, then either: - - we got an address passed in with -B, in which case we don't want to - interfere with what the user said; - - or host_start is based off of the ELF image's loaddr. The check "if - (host_start && real_start != current_start)" suggests that we really - want lowest available address that is >= loaddr. I don't know why that - is, but I'm trusting that Paul Brook knew what he was doing when he - wrote the original version of that check in - c581deda322080e8beb88b2e468d4af54454e4b3 way back in 2010. - -Signed-off-by: Luke Shumaker <lukeshu@parabola.nu> ---- - linux-user/elfload.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++++ - 1 file changed, 49 insertions(+) - -diff --git a/linux-user/elfload.c b/linux-user/elfload.c -index 7736ea2c3a..cd3a7d877d 100644 ---- a/linux-user/elfload.c -+++ b/linux-user/elfload.c -@@ -1857,6 +1857,55 @@ unsigned long init_guest_space(unsigned long host_start, - - /* Otherwise, a non-zero size region of memory needs to be mapped - * and validated. */ -+ -+#if defined(TARGET_ARM) && !defined(TARGET_AARCH64) -+ /* On 32-bit ARM, we need to map not just the usable memory, but -+ * also the commpage. Try to find a suitable place by allocating -+ * a big chunk for all of it. If host_start, then the naive -+ * strategy probably does good enough. -+ */ -+ if (!host_start) { -+ unsigned long guest_full_size, host_full_size, real_start; -+ -+ guest_full_size = -+ (0xffff0f00 & qemu_host_page_mask) + qemu_host_page_size; -+ host_full_size = guest_full_size - guest_start; -+ real_start = (unsigned long) -+ mmap(NULL, host_full_size, PROT_NONE, flags, -1, 0); -+ if (real_start == (unsigned long)-1) { -+ if (host_size < host_full_size - qemu_host_page_size) { -+ /* We failed to map a continous segment, but we're -+ * allowed to have a gap between the usable memory and -+ * the commpage where other things can be mapped. -+ * This sparseness gives us more flexibility to find -+ * an address range. -+ */ -+ goto naive; -+ } -+ return (unsigned long)-1; -+ } -+ munmap((void *)real_start, host_full_size); -+ if (real_start & ~qemu_host_page_mask) { -+ /* The same thing again, but with an extra qemu_host_page_size -+ * so that we can shift around alignment. -+ */ -+ unsigned long real_size = host_full_size + qemu_host_page_size; -+ real_start = (unsigned long) -+ mmap(NULL, real_size, PROT_NONE, flags, -1, 0); -+ if (real_start == (unsigned long)-1) { -+ if (host_size < host_full_size - qemu_host_page_size) { -+ goto naive; -+ } -+ return (unsigned long)-1; -+ } -+ munmap((void *)real_start, real_size); -+ real_start = HOST_PAGE_ALIGN(real_start); -+ } -+ current_start = real_start; -+ } -+ naive: -+#endif -+ - while (1) { - unsigned long real_start, real_size, aligned_size; - aligned_size = real_size = host_size; --- -2.15.1 - |