[PATCH v3 3/5] linux-user: Implement stracing madvise()

[Ilya Leoshkevich <iii@linux.ibm.com>]

The default implementation has several problems: the first argument is
not displayed as a pointer, making it harder to grep; the third
argument is not symbolized; and there are several extra unused
arguments.

Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
---
 linux-user/strace.c    | 41 +++++++++++++++++++++++++++++++++++++++++
 linux-user/strace.list |  2 +-
 2 files changed, 42 insertions(+), 1 deletion(-)

diff --git a/linux-user/strace.c b/linux-user/strace.c
index 7d882526da..c262c0c9b6 100644
--- a/linux-user/strace.c
+++ b/linux-user/strace.c
@@ -17,6 +17,7 @@
 #include "qemu.h"
 #include "user-internals.h"
 #include "strace.h"
+#include "target_mman.h"
 
 struct syscallname {
     int nr;
@@ -2969,6 +2970,46 @@ print_stat(CPUArchState *cpu_env, const struct syscallname *name,
 #define print_lstat64   print_stat
 #endif
 
+#if defined(TARGET_NR_madvise)
+static struct enums madvise_advice[] = {
+    ENUM_TARGET(MADV_NORMAL),
+    ENUM_TARGET(MADV_RANDOM),
+    ENUM_TARGET(MADV_SEQUENTIAL),
+    ENUM_TARGET(MADV_WILLNEED),
+    ENUM_TARGET(MADV_DONTNEED),
+    ENUM_TARGET(MADV_FREE),
+    ENUM_TARGET(MADV_REMOVE),
+    ENUM_TARGET(MADV_DONTFORK),
+    ENUM_TARGET(MADV_DOFORK),
+    ENUM_TARGET(MADV_MERGEABLE),
+    ENUM_TARGET(MADV_UNMERGEABLE),
+    ENUM_TARGET(MADV_HUGEPAGE),
+    ENUM_TARGET(MADV_NOHUGEPAGE),
+    ENUM_TARGET(MADV_DONTDUMP),
+    ENUM_TARGET(MADV_DODUMP),
+    ENUM_TARGET(MADV_WIPEONFORK),
+    ENUM_TARGET(MADV_KEEPONFORK),
+    ENUM_TARGET(MADV_COLD),
+    ENUM_TARGET(MADV_PAGEOUT),
+    ENUM_TARGET(MADV_POPULATE_READ),
+    ENUM_TARGET(MADV_POPULATE_WRITE),
+    ENUM_TARGET(MADV_DONTNEED_LOCKED),
+    ENUM_END,
+};
+
+static void
+print_madvise(CPUArchState *cpu_env, const struct syscallname *name,
+              abi_long arg0, abi_long arg1, abi_long arg2,
+              abi_long arg3, abi_long arg4, abi_long arg5)
+{
+    print_syscall_prologue(name);
+    print_pointer(arg0, 0);
+    print_raw_param("%d", arg1, 0);
+    print_enums(madvise_advice, arg2, 1);
+    print_syscall_epilogue(name);
+}
+#endif
+
 #if defined(TARGET_NR_fstat) || defined(TARGET_NR_fstat64)
 static void
 print_fstat(CPUArchState *cpu_env, const struct syscallname *name,
diff --git a/linux-user/strace.list b/linux-user/strace.list
index 72e17b1acf..c93effdbc8 100644
--- a/linux-user/strace.list
+++ b/linux-user/strace.list
@@ -541,7 +541,7 @@
 { TARGET_NR_lstat64, "lstat64" , NULL, print_lstat64, NULL },
 #endif
 #ifdef TARGET_NR_madvise
-{ TARGET_NR_madvise, "madvise" , NULL, NULL, NULL },
+{ TARGET_NR_madvise, "madvise" , NULL, print_madvise, NULL },
 #endif
 #ifdef TARGET_NR_madvise1
 { TARGET_NR_madvise1, "madvise1" , NULL, NULL, NULL },
-- 
2.37.2