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[Qemu-devel] [PULL 26/28] linux-user: Allow targets to specify a minimum
From: |
Peter Maydell |
Subject: |
[Qemu-devel] [PULL 26/28] linux-user: Allow targets to specify a minimum uname release |
Date: |
Tue, 10 Sep 2013 19:52:20 +0100 |
For newer target architectures, glibc can be picky about the kernel
version: for example, it will not run on an aarch64 system unless
the kernel reports itself as at least 3.8.0. Accommodate this by
enhancing the existing support for faking the kernel version so
that each target can optionally specify a minimum version: if
the user doesn't force a specific fake version then we will override
with the minimum required version only if the real host kernel
version is insufficient.
Use this facility to let aarch64 report a minimum of 3.8.0.
Signed-off-by: Peter Maydell <address@hidden>
Message-id: address@hidden
---
linux-user/main.c | 2 ++
linux-user/qemu.h | 1 +
linux-user/syscall.c | 62 ++++++++++++++++++++++++++++++++++++++------------
3 files changed, 51 insertions(+), 14 deletions(-)
diff --git a/linux-user/main.c b/linux-user/main.c
index b6e434a..8838305 100644
--- a/linux-user/main.c
+++ b/linux-user/main.c
@@ -3676,6 +3676,8 @@ int main(int argc, char **argv, char **envp)
/* Scan interp_prefix dir for replacement files. */
init_paths(interp_prefix);
+ init_qemu_uname_release();
+
if (cpu_model == NULL) {
#if defined(TARGET_I386)
#ifdef TARGET_X86_64
diff --git a/linux-user/qemu.h b/linux-user/qemu.h
index 4df4fcb..6ffe5a2 100644
--- a/linux-user/qemu.h
+++ b/linux-user/qemu.h
@@ -197,6 +197,7 @@ extern THREAD CPUState *thread_cpu;
void cpu_loop(CPUArchState *env);
char *target_strerror(int err);
int get_osversion(void);
+void init_qemu_uname_release(void);
void fork_start(void);
void fork_end(int child);
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index ea04db1..c62d875 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -4863,12 +4863,35 @@ int host_to_target_waitstatus(int status)
return status;
}
+static int relstr_to_int(const char *s)
+{
+ /* Convert a uname release string like "2.6.18" to an integer
+ * of the form 0x020612. (Beware that 0x020612 is *not* 2.6.12.)
+ */
+ int i, n, tmp;
+
+ tmp = 0;
+ for (i = 0; i < 3; i++) {
+ n = 0;
+ while (*s >= '0' && *s <= '9') {
+ n *= 10;
+ n += *s - '0';
+ s++;
+ }
+ tmp = (tmp << 8) + n;
+ if (*s == '.') {
+ s++;
+ }
+ }
+ return tmp;
+}
+
int get_osversion(void)
{
static int osversion;
struct new_utsname buf;
const char *s;
- int i, n, tmp;
+
if (osversion)
return osversion;
if (qemu_uname_release && *qemu_uname_release) {
@@ -4878,22 +4901,33 @@ int get_osversion(void)
return 0;
s = buf.release;
}
- tmp = 0;
- for (i = 0; i < 3; i++) {
- n = 0;
- while (*s >= '0' && *s <= '9') {
- n *= 10;
- n += *s - '0';
- s++;
- }
- tmp = (tmp << 8) + n;
- if (*s == '.')
- s++;
- }
- osversion = tmp;
+ osversion = relstr_to_int(s);
return osversion;
}
+void init_qemu_uname_release(void)
+{
+ /* Initialize qemu_uname_release for later use.
+ * If the host kernel is too old and the user hasn't asked for
+ * a specific fake version number, we might want to fake a minimum
+ * target kernel version.
+ */
+#ifdef UNAME_MINIMUM_RELEASE
+ struct new_utsname buf;
+
+ if (qemu_uname_release && *qemu_uname_release) {
+ return;
+ }
+
+ if (sys_uname(&buf)) {
+ return;
+ }
+
+ if (relstr_to_int(buf.release) < relstr_to_int(UNAME_MINIMUM_RELEASE)) {
+ qemu_uname_release = UNAME_MINIMUM_RELEASE;
+ }
+#endif
+}
static int open_self_maps(void *cpu_env, int fd)
{
--
1.7.9.5
- [Qemu-devel] [PULL 00/28] target-arm queue, Peter Maydell, 2013/09/10
- [Qemu-devel] [PULL 06/28] pl110: Clarify comment about PL110 ID on VersatilePB, Peter Maydell, 2013/09/10
- [Qemu-devel] [PULL 28/28] configure: Add handling code for AArch64 targets, Peter Maydell, 2013/09/10
- [Qemu-devel] [PULL 26/28] linux-user: Allow targets to specify a minimum uname release,
Peter Maydell <=
- [Qemu-devel] [PULL 23/28] linux-user: Make sure NWFPE code is 32 bit ARM only, Peter Maydell, 2013/09/10
- [Qemu-devel] [PULL 25/28] linux-user: Add AArch64 termbits.h definitions, Peter Maydell, 2013/09/10
- [Qemu-devel] [PULL 21/28] linux-user: Fix up AArch64 syscall handlers, Peter Maydell, 2013/09/10
- [Qemu-devel] [PULL 19/28] linux-user: Add cpu loop for AArch64, Peter Maydell, 2013/09/10
- [Qemu-devel] [PULL 18/28] linux-user: Don't treat AArch64 cpu names specially, Peter Maydell, 2013/09/10
- [Qemu-devel] [PULL 24/28] linux-user: Implement cpu_set_tls() and cpu_clone_regs() for AArch64, Peter Maydell, 2013/09/10
- [Qemu-devel] [PULL 10/28] target-arm: Export cpu_env, Peter Maydell, 2013/09/10
- [Qemu-devel] [PULL 20/28] linux-user: Add syscall number definitions for AArch64, Peter Maydell, 2013/09/10
- [Qemu-devel] [PULL 07/28] abitypes.h: Remove incorrect ARM ABI_LLONG_ALIGNMENT, Peter Maydell, 2013/09/10
- [Qemu-devel] [PULL 14/28] target-arm: Disable 32 bit CPUs in 64 bit linux-user builds, Peter Maydell, 2013/09/10