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[174.21.9.133]) by smtp.gmail.com with ESMTPSA id o133-v6sm24988124pfg.86.2018.10.16.18.54.58 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Tue, 16 Oct 2018 18:54:59 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=7LDAkXYqm0E1INzhyCfPvhMzExqgurjucKqSbAhcSOg=; b=OUVYb2xJEQxeUL7/0wbuFc5C0dAMjJg2SPvJgMBGzV3f98HZUiAeNBE6SD59Kdap04 MOreS8guKKeY18NMFc5qPj7tr19NtyW23fIV4uNQkvJ+GEvk4OLigSyYcJacsMx6eN+H 55T+YsBza/MsYZlu8aBROmH1rv7zl8rhDUYyY= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=7LDAkXYqm0E1INzhyCfPvhMzExqgurjucKqSbAhcSOg=; b=G1rRhroGEcP1QDrtvyZPnDQMVqAXLLor2TY2GsC8iAVX/ytsXEeVqBPJJu1+qrJvlU Q+Go1cAR3m9H5P1DhjXuWlbGnnlMatKC6FNRzkjRp698+i4dz0fQTUycC50MwiFUdVmX RVqQSkgNBFBVClAaHcGvCesNpcSz8cHYNp4ZivQ8aikUF2Frx2jRchxbKL5EY0WU4pNJ 6XLEPkRZJ6CGC2YGts2ztFr4tIjXsQxU8YU7qgB0Cr7uAR/vyluLXRGFQFhxZoobQYbR ep5wUPUQIqfEnrTdjsYQ4pqwOJ5v9k/3LL9BrSrVi2GXdeLu1FEpSZFKLwOJH6YS1a5J 2u/g== X-Gm-Message-State: ABuFfoi2mjudvih7or+nGBp9H4zbFF2LP/UzljAhYCPclAD/mxCio+iJ IfqZ32rLj3gT/6y2JgBioDgSzb5bqKk= X-Google-Smtp-Source: ACcGV63V2/Z+3F18u3YF3EXO6m6v+cUSZhNHHIIAwk6d2nmVqtGOANwUYfbcbIGsoL/4nX98LAmdmQ== X-Received: by 2002:a65:4301:: with SMTP id j1-v6mr6445832pgq.279.1539741300064; Tue, 16 Oct 2018 18:55:00 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Date: Tue, 16 Oct 2018 18:54:54 -0700 Message-Id: <20181017015456.3293-2-richard.henderson@linaro.org> X-Mailer: git-send-email 2.17.2 In-Reply-To: <20181017015456.3293-1-richard.henderson@linaro.org> References: <20181017015456.3293-1-richard.henderson@linaro.org> X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2607:f8b0:4864:20::541 Subject: [Qemu-devel] [PATCH 1/3] tests/tcg/multiarch/linux-test: Fix error check for shmat X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: laurent@vivier.eu Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) X-ZohoMail: RDMRC_1 RDKM_2 RSF_0 Z_629925259 SPT_0 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" The error indicator for this syscall is -1, not 0. Signed-off-by: Richard Henderson --- tests/tcg/multiarch/linux-test.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/tests/tcg/multiarch/linux-test.c b/tests/tcg/multiarch/linux-t= est.c index e80eccc0ce..6d2c02c5c0 100644 --- a/tests/tcg/multiarch/linux-test.c +++ b/tests/tcg/multiarch/linux-test.c @@ -503,8 +503,9 @@ static void test_shm(void) =20 shmid =3D chk_error(shmget(IPC_PRIVATE, SHM_SIZE, IPC_CREAT | 0777)); ptr =3D shmat(shmid, NULL, 0); - if (!ptr) + if (ptr =3D=3D (void *)-1) { error("shmat"); + } =20 memset(ptr, 0, SHM_SIZE); =20 --=20 2.17.2 From nobody Thu Nov 6 06:15:31 2025 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) client-ip=208.118.235.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; dkim=fail; spf=pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=linaro.org Return-Path: Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) by mx.zohomail.com with SMTPS id 1539741542923738.1666341720803; Tue, 16 Oct 2018 18:59:02 -0700 (PDT) Received: from localhost ([::1]:33390 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gCb6v-000529-FN for importer@patchew.org; Tue, 16 Oct 2018 21:58:57 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:47740) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gCb3C-0002WI-AC for qemu-devel@nongnu.org; Tue, 16 Oct 2018 21:55:07 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1gCb3A-00070p-UT for qemu-devel@nongnu.org; Tue, 16 Oct 2018 21:55:06 -0400 Received: from mail-pg1-x541.google.com ([2607:f8b0:4864:20::541]:39505) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1gCb39-0006za-7L for qemu-devel@nongnu.org; Tue, 16 Oct 2018 21:55:04 -0400 Received: by mail-pg1-x541.google.com with SMTP id r9-v6so11724005pgv.6 for ; Tue, 16 Oct 2018 18:55:03 -0700 (PDT) Received: from cloudburst.twiddle.net (174-21-9-133.tukw.qwest.net. [174.21.9.133]) by smtp.gmail.com with ESMTPSA id o133-v6sm24988124pfg.86.2018.10.16.18.55.00 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Tue, 16 Oct 2018 18:55:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=sllljg6tcJ+oEXIZfjxYL6mWo5HZ1+0sOlSaCS0XBMU=; b=frf52t1BK4uZi6sRNC1j8RwnVrW2INLxHDvocucPDyHrI2TvVKHVNAjTONHQi0qeWo pEz6B4g0IhB8vgM4zRPpSv12ytcfWjHmfvA0mVP0eO+KnOjI00RUBd3+vo31FzCoahRs /w6O09QE5gyR4AiKmvtbICCLocfFHwBT6KvGk= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=sllljg6tcJ+oEXIZfjxYL6mWo5HZ1+0sOlSaCS0XBMU=; b=TwaYbTqCgB+/kVNTJ0SXsO0/eB203kFWQV3EtmR3ooobhuujBiDVm82ZHRL7/BZx3P AOu8je8190UZxWLbBQspNmjiZdbMM0WbngpI+w9TIcaGAi6xcuM7V2gjaISKxfoByV/k bpdq67JfGxmlT/YRVbm5icz29ri18bQYPPFpFdOZwWM/ewMMv+1PUdnbIzn9JwtWZo9+ pizwH6OFaMPYy3GyZiopVBOCMN3rzdUIbAGp6Ot1bviMwZX2XwY4ax9KQ4GB4BiI3Xfw ryt6VlYcTBk9PSA/+j0xK2CJAyCdfzDW8iujWeVGeVouBN6Zoku5I9xs2QXW/6/xBt1n R06w== X-Gm-Message-State: ABuFfojOIGoSJ3cNngEc4lCqSo6rWwHwuFo87TTK21idPQJHKgbO6M9L GUFHDdepHCdVYZQM0x1s24aYTp5W52Q= X-Google-Smtp-Source: ACcGV63aTFzBsn4E9JijWJRrD8k4XTVx//qz0nEyFEpFXm0oINo16Rk4yNQP5x7PZUcwgRi8xZyoRg== X-Received: by 2002:a63:4904:: with SMTP id w4-v6mr22520972pga.303.1539741301710; Tue, 16 Oct 2018 18:55:01 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Date: Tue, 16 Oct 2018 18:54:55 -0700 Message-Id: <20181017015456.3293-3-richard.henderson@linaro.org> X-Mailer: git-send-email 2.17.2 In-Reply-To: <20181017015456.3293-1-richard.henderson@linaro.org> References: <20181017015456.3293-1-richard.henderson@linaro.org> X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2607:f8b0:4864:20::541 Subject: [Qemu-devel] [PATCH 2/3] linux-user: Fix shmat emulation by honoring host SHMLBA X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: laurent@vivier.eu Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) X-ZohoMail: RDMRC_1 RDKM_2 RSF_0 Z_629925259 SPT_0 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" For those hosts with SHMLBA > getpagesize, we don't automatically select a guest address that is compatible with the host. We can achieve this by boosting the alignment of guest_base and by adding an extra alignment argument to mmap_find_vma. Signed-off-by: Richard Henderson --- linux-user/qemu.h | 2 +- linux-user/elfload.c | 17 +++++----- linux-user/mmap.c | 74 +++++++++++++++++++++++--------------------- linux-user/syscall.c | 3 +- 4 files changed, 52 insertions(+), 44 deletions(-) diff --git a/linux-user/qemu.h b/linux-user/qemu.h index b4959e41c6..67a4f3c020 100644 --- a/linux-user/qemu.h +++ b/linux-user/qemu.h @@ -439,7 +439,7 @@ abi_long target_mremap(abi_ulong old_addr, abi_ulong ol= d_size, abi_ulong new_addr); extern unsigned long last_brk; extern abi_ulong mmap_next_start; -abi_ulong mmap_find_vma(abi_ulong, abi_ulong); +abi_ulong mmap_find_vma(abi_ulong, abi_ulong, abi_ulong); void mmap_fork_start(void); void mmap_fork_end(int child); =20 diff --git a/linux-user/elfload.c b/linux-user/elfload.c index 10bca65b99..ec200a39ad 100644 --- a/linux-user/elfload.c +++ b/linux-user/elfload.c @@ -3,6 +3,7 @@ #include =20 #include +#include =20 #include "qemu.h" #include "disas/disas.h" @@ -1942,6 +1943,8 @@ unsigned long init_guest_space(unsigned long host_sta= rt, unsigned long guest_start, bool fixed) { + /* In order to use host shmat, we must be able to honor SHMLBA. */ + unsigned long align =3D MAX(SHMLBA, qemu_host_page_size); unsigned long current_start, aligned_start; int flags; =20 @@ -1959,7 +1962,7 @@ unsigned long init_guest_space(unsigned long host_sta= rt, } =20 /* Setup the initial flags and start address. */ - current_start =3D host_start & qemu_host_page_mask; + current_start =3D host_start & -align; flags =3D MAP_ANONYMOUS | MAP_PRIVATE | MAP_NORESERVE; if (fixed) { flags |=3D MAP_FIXED; @@ -1995,8 +1998,8 @@ unsigned long init_guest_space(unsigned long host_sta= rt, 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 + if (real_start & (align - 1)) { + /* The same thing again, but with extra * so that we can shift around alignment. */ unsigned long real_size =3D host_full_size + qemu_host_page_si= ze; @@ -2009,7 +2012,7 @@ unsigned long init_guest_space(unsigned long host_sta= rt, return (unsigned long)-1; } munmap((void *)real_start, real_size); - real_start =3D HOST_PAGE_ALIGN(real_start); + real_start =3D ROUND_UP(real_start, align); } current_start =3D real_start; } @@ -2036,7 +2039,7 @@ unsigned long init_guest_space(unsigned long host_sta= rt, } =20 /* Ensure the address is properly aligned. */ - if (real_start & ~qemu_host_page_mask) { + if (real_start & (align - 1)) { /* Ideally, we adjust like * * pages: [ ][ ][ ][ ][ ] @@ -2064,7 +2067,7 @@ unsigned long init_guest_space(unsigned long host_sta= rt, if (real_start =3D=3D (unsigned long)-1) { return (unsigned long)-1; } - aligned_start =3D HOST_PAGE_ALIGN(real_start); + aligned_start =3D ROUND_UP(real_start, align); } else { aligned_start =3D real_start; } @@ -2101,7 +2104,7 @@ unsigned long init_guest_space(unsigned long host_sta= rt, * because of trouble with ARM commpage setup. */ munmap((void *)real_start, real_size); - current_start +=3D qemu_host_page_size; + current_start +=3D align; if (host_start =3D=3D current_start) { /* Theoretically possible if host doesn't have any suitably * aligned areas. Normally the first mmap will fail. diff --git a/linux-user/mmap.c b/linux-user/mmap.c index 41e0983ce8..47950ee9d7 100644 --- a/linux-user/mmap.c +++ b/linux-user/mmap.c @@ -202,49 +202,52 @@ unsigned long last_brk; =20 /* Subroutine of mmap_find_vma, used when we have pre-allocated a chunk of guest address space. */ -static abi_ulong mmap_find_vma_reserved(abi_ulong start, abi_ulong size) +static abi_ulong mmap_find_vma_reserved(abi_ulong start, abi_ulong size, + abi_ulong align) { - abi_ulong addr; - abi_ulong end_addr; + abi_ulong addr, end_addr, incr =3D qemu_host_page_size; int prot; - int looped =3D 0; + bool looped =3D false; =20 if (size > reserved_va) { return (abi_ulong)-1; } =20 - size =3D HOST_PAGE_ALIGN(size); - end_addr =3D start + size; - if (end_addr > reserved_va) { - end_addr =3D reserved_va; - } - addr =3D end_addr - qemu_host_page_size; + /* Note that start and size have already been aligned by mmap_find_vma= . */ =20 + end_addr =3D start + size; + if (start > reserved_va - size) { + /* Start at the top of the address space. */ + end_addr =3D ((reserved_va - size) & -align) + size; + looped =3D true; + } + + /* Search downward from END_ADDR, checking to see if a page is in use.= */ + addr =3D end_addr; while (1) { + addr -=3D incr; if (addr > end_addr) { if (looped) { + /* Failure. The entire address space has been searched. = */ return (abi_ulong)-1; } - end_addr =3D reserved_va; - addr =3D end_addr - qemu_host_page_size; - looped =3D 1; - continue; + /* Re-start at the top of the address space. */ + addr =3D end_addr =3D ((reserved_va - size) & -align) + size; + looped =3D true; + } else { + prot =3D page_get_flags(addr); + if (prot) { + /* Page in use. Restart below this page. */ + addr =3D end_addr =3D ((addr - size) & -align) + size; + } else if (addr && addr + size =3D=3D end_addr) { + /* Success! All pages between ADDR and END_ADDR are free.= */ + if (start =3D=3D mmap_next_start) { + mmap_next_start =3D addr; + } + return addr; + } } - prot =3D page_get_flags(addr); - if (prot) { - end_addr =3D addr; - } - if (addr && addr + size =3D=3D end_addr) { - break; - } - addr -=3D qemu_host_page_size; } - - if (start =3D=3D mmap_next_start) { - mmap_next_start =3D addr; - } - - return addr; } =20 /* @@ -253,7 +256,7 @@ 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. */ -abi_ulong mmap_find_vma(abi_ulong start, abi_ulong size) +abi_ulong mmap_find_vma(abi_ulong start, abi_ulong size, abi_ulong align) { void *ptr, *prev; abi_ulong addr; @@ -265,11 +268,12 @@ abi_ulong mmap_find_vma(abi_ulong start, abi_ulong si= ze) } else { start &=3D qemu_host_page_mask; } + start =3D ROUND_UP(start, align); =20 size =3D HOST_PAGE_ALIGN(size); =20 if (reserved_va) { - return mmap_find_vma_reserved(start, size); + return mmap_find_vma_reserved(start, size, align); } =20 addr =3D start; @@ -299,7 +303,7 @@ abi_ulong mmap_find_vma(abi_ulong start, abi_ulong size) if (h2g_valid(ptr + size - 1)) { addr =3D h2g(ptr); =20 - if ((addr & ~TARGET_PAGE_MASK) =3D=3D 0) { + if ((addr & (align - 1)) =3D=3D 0) { /* Success. */ if (start =3D=3D mmap_next_start && addr >=3D TASK_UNMAPPE= D_BASE) { mmap_next_start =3D addr + size; @@ -313,12 +317,12 @@ abi_ulong mmap_find_vma(abi_ulong start, abi_ulong si= ze) /* Assume the result that the kernel gave us is the first with enough free space, so start again at the next higher target page. */ - addr =3D TARGET_PAGE_ALIGN(addr); + addr =3D ROUND_UP(addr, align); break; case 1: /* Sometimes the kernel decides to perform the allocation at the top end of memory instead. */ - addr &=3D TARGET_PAGE_MASK; + addr &=3D -align; break; case 2: /* Start over at low memory. */ @@ -416,7 +420,7 @@ abi_long target_mmap(abi_ulong start, abi_ulong len, in= t prot, if (!(flags & MAP_FIXED)) { host_len =3D len + offset - host_offset; host_len =3D HOST_PAGE_ALIGN(host_len); - start =3D mmap_find_vma(real_start, host_len); + start =3D mmap_find_vma(real_start, host_len, TARGET_PAGE_SIZE); if (start =3D=3D (abi_ulong)-1) { errno =3D ENOMEM; goto fail; @@ -710,7 +714,7 @@ abi_long target_mremap(abi_ulong old_addr, abi_ulong ol= d_size, } else if (flags & MREMAP_MAYMOVE) { abi_ulong mmap_start; =20 - mmap_start =3D mmap_find_vma(0, new_size); + mmap_start =3D mmap_find_vma(0, new_size, TARGET_PAGE_SIZE); =20 if (mmap_start =3D=3D -1) { errno =3D ENOMEM; diff --git a/linux-user/syscall.c b/linux-user/syscall.c index ae3c0dfef7..7a69855344 100644 --- a/linux-user/syscall.c +++ b/linux-user/syscall.c @@ -3815,7 +3815,8 @@ static inline abi_ulong do_shmat(CPUArchState *cpu_en= v, else { abi_ulong mmap_start; =20 - mmap_start =3D mmap_find_vma(0, shm_info.shm_segsz); + /* In order to use the host shmat, we need to honor host SHMLBA. = */ + mmap_start =3D mmap_find_vma(0, shm_info.shm_segsz, MAX(SHMLBA, sh= mlba)); =20 if (mmap_start =3D=3D -1) { errno =3D ENOMEM; --=20 2.17.2 From nobody Thu Nov 6 06:15:31 2025 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) client-ip=208.118.235.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; dkim=fail; spf=pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=linaro.org Return-Path: Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) by mx.zohomail.com with SMTPS id 1539741469516377.08255854039123; Tue, 16 Oct 2018 18:57:49 -0700 (PDT) Received: from localhost ([::1]:33387 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gCb5n-0004Dh-Sx for importer@patchew.org; Tue, 16 Oct 2018 21:57:47 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:47736) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gCb3B-0002WC-Ry for qemu-devel@nongnu.org; Tue, 16 Oct 2018 21:55:06 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1gCb3B-00071U-39 for qemu-devel@nongnu.org; Tue, 16 Oct 2018 21:55:05 -0400 Received: from mail-pl1-x643.google.com ([2607:f8b0:4864:20::643]:35131) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1gCb3A-0006zx-NJ for qemu-devel@nongnu.org; Tue, 16 Oct 2018 21:55:04 -0400 Received: by mail-pl1-x643.google.com with SMTP id f8-v6so11891485plb.2 for ; Tue, 16 Oct 2018 18:55:04 -0700 (PDT) Received: from cloudburst.twiddle.net (174-21-9-133.tukw.qwest.net. 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X-Received-From: 2607:f8b0:4864:20::643 Subject: [Qemu-devel] [PATCH 3/3] linux-user: Align mmap_find_vma to host page size X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: laurent@vivier.eu Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) X-ZohoMail: RDMRC_1 RDKM_2 RSF_0 Z_629925259 SPT_0 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" This can avoid stack allocation failures for i386 guest on ppc64 (64k page) host. Suggested-by: Laurent Vivier Signed-off-by: Richard Henderson --- linux-user/mmap.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/linux-user/mmap.c b/linux-user/mmap.c index 47950ee9d7..735bc928fe 100644 --- a/linux-user/mmap.c +++ b/linux-user/mmap.c @@ -262,6 +262,8 @@ abi_ulong mmap_find_vma(abi_ulong start, abi_ulong size= , abi_ulong align) abi_ulong addr; int wrapped, repeat; =20 + align =3D MAX(align, qemu_host_page_size); + /* If 'start' =3D=3D 0, then a default start address is used. */ if (start =3D=3D 0) { start =3D mmap_next_start; --=20 2.17.2