linux-user: Add strace for prlimit64() syscall

Add proper prlimit64() strace output.

Signed-off-by: Helge Deller <deller@gmx.de>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20221222190639.124078-1-deller@gmx.de>
[lvivier: use print_raw_param64()]
Signed-off-by: Laurent Vivier <laurent@vivier.eu>

linux-user/strace.c

@@ -3866,6 +3866,94 @@ print_futex(CPUArchState *cpu_env, const struct syscallname *name,
 }
 #endif
 
+#ifdef TARGET_NR_prlimit64
+static const char *target_ressource_string(abi_ulong r)
+{
+    #define RET_RES_ENTRY(res) case TARGET_##res:  return #res;
+    switch (r) {
+    RET_RES_ENTRY(RLIMIT_AS);
+    RET_RES_ENTRY(RLIMIT_CORE);
+    RET_RES_ENTRY(RLIMIT_CPU);
+    RET_RES_ENTRY(RLIMIT_DATA);
+    RET_RES_ENTRY(RLIMIT_FSIZE);
+    RET_RES_ENTRY(RLIMIT_LOCKS);
+    RET_RES_ENTRY(RLIMIT_MEMLOCK);
+    RET_RES_ENTRY(RLIMIT_MSGQUEUE);
+    RET_RES_ENTRY(RLIMIT_NICE);
+    RET_RES_ENTRY(RLIMIT_NOFILE);
+    RET_RES_ENTRY(RLIMIT_NPROC);
+    RET_RES_ENTRY(RLIMIT_RSS);
+    RET_RES_ENTRY(RLIMIT_RTPRIO);
+#ifdef RLIMIT_RTTIME
+    RET_RES_ENTRY(RLIMIT_RTTIME);
+#endif
+    RET_RES_ENTRY(RLIMIT_SIGPENDING);
+    RET_RES_ENTRY(RLIMIT_STACK);
+    default:
+        return NULL;
+    }
+    #undef RET_RES_ENTRY
+}
+
+static void
+print_rlimit64(abi_ulong rlim_addr, int last)
+{
+    if (rlim_addr) {
+        struct target_rlimit64 *rl;
+
+        rl = lock_user(VERIFY_READ, rlim_addr, sizeof(*rl), 1);
+        if (!rl) {
+            print_pointer(rlim_addr, last);
+            return;
+        }
+        print_raw_param64("{rlim_cur=%" PRId64, tswap64(rl->rlim_cur), 0);
+        print_raw_param64("rlim_max=%" PRId64 "}", tswap64(rl->rlim_max),
+                            last);
+        unlock_user(rl, rlim_addr, 0);
+    } else {
+        qemu_log("NULL%s", get_comma(last));
+    }
+}
+
+static void
+print_prlimit64(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)
+{
+    const char *rlim_name;
+
+    print_syscall_prologue(name);
+    print_raw_param("%d", arg0, 0);
+    rlim_name = target_ressource_string(arg1);
+    if (rlim_name) {
+        qemu_log("%s,", rlim_name);
+    } else {
+        print_raw_param("%d", arg1, 0);
+    }
+    print_rlimit64(arg2, 0);
+    print_pointer(arg3, 1);
+    print_syscall_epilogue(name);
+}
+
+static void
+print_syscall_ret_prlimit64(CPUArchState *cpu_env,
+                       const struct syscallname *name,
+                       abi_long ret, abi_long arg0, abi_long arg1,
+                       abi_long arg2, abi_long arg3, abi_long arg4,
+                       abi_long arg5)
+{
+    if (!print_syscall_err(ret)) {
+        qemu_log(TARGET_ABI_FMT_ld, ret);
+        if (arg3) {
+            qemu_log(" (");
+            print_rlimit64(arg3, 1);
+            qemu_log(")");
+        }
+    }
+    qemu_log("\n");
+}
+#endif
+
 #ifdef TARGET_NR_kill
 static void
 print_kill(CPUArchState *cpu_env, const struct syscallname *name,

linux-user/strace.list

@@ -1074,7 +1074,8 @@
 { TARGET_NR_preadv, "preadv" , NULL, NULL, NULL },
 #endif
 #ifdef TARGET_NR_prlimit64
-{ TARGET_NR_prlimit64, "prlimit64" , NULL, NULL, NULL },
+{ TARGET_NR_prlimit64, "prlimit64" , NULL, print_prlimit64,
+                    print_syscall_ret_prlimit64 },
 #endif
 #ifdef TARGET_NR_process_vm_readv
 { TARGET_NR_process_vm_readv, "process_vm_readv" , NULL, NULL, NULL },