[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[RFC v4 04/11] linux-user: Implement native-bypass option support
From: |
Yeqi Fu |
Subject: |
[RFC v4 04/11] linux-user: Implement native-bypass option support |
Date: |
Tue, 8 Aug 2023 22:17:32 +0800 |
This commit implements the -native-bypass support in linux-user. The
native_calls_enabled() function can be true only when the
'-native-bypass' option is given.
Signed-off-by: Yeqi Fu <fufuyqqqqqq@gmail.com>
---
include/native/native.h | 9 +++++++++
linux-user/main.c | 38 ++++++++++++++++++++++++++++++++++++++
2 files changed, 47 insertions(+)
create mode 100644 include/native/native.h
diff --git a/include/native/native.h b/include/native/native.h
new file mode 100644
index 0000000000..62951fafb1
--- /dev/null
+++ b/include/native/native.h
@@ -0,0 +1,9 @@
+/*
+ * Check if the native bypass feature is enabled.
+ */
+#if defined(CONFIG_USER_ONLY) && defined(CONFIG_NATIVE_CALL)
+extern char *native_lib_path;
+#define native_bypass_enabled() native_lib_path ? true : false
+#else
+#define native_bypass_enabled() false
+#endif
diff --git a/linux-user/main.c b/linux-user/main.c
index dba67ffa36..86ea0191f7 100644
--- a/linux-user/main.c
+++ b/linux-user/main.c
@@ -60,6 +60,11 @@
#include "semihosting/semihost.h"
#endif
+#if defined(CONFIG_NATIVE_CALL)
+#include "native/native.h"
+char *native_lib_path;
+#endif
+
#ifndef AT_FLAGS_PRESERVE_ARGV0
#define AT_FLAGS_PRESERVE_ARGV0_BIT 0
#define AT_FLAGS_PRESERVE_ARGV0 (1 << AT_FLAGS_PRESERVE_ARGV0_BIT)
@@ -293,6 +298,17 @@ static void handle_arg_set_env(const char *arg)
free(r);
}
+#if defined(CONFIG_NATIVE_CALL)
+static void handle_arg_native_bypass(const char *arg)
+{
+ if (access(arg, F_OK) != 0) {
+ fprintf(stderr, "native library %s does not exist\n", arg);
+ exit(EXIT_FAILURE);
+ }
+ native_lib_path = strdup(arg);
+}
+#endif
+
static void handle_arg_unset_env(const char *arg)
{
char *r, *p, *token;
@@ -522,6 +538,10 @@ static const struct qemu_argument arg_table[] = {
"", "Generate a /tmp/perf-${pid}.map file for perf"},
{"jitdump", "QEMU_JITDUMP", false, handle_arg_jitdump,
"", "Generate a jit-${pid}.dump file for perf"},
+#if defined(CONFIG_NATIVE_CALL)
+ {"native-bypass", "QEMU_NATIVE_BYPASS", true, handle_arg_native_bypass,
+ "", "native bypass for library calls in user mode only."},
+#endif
{NULL, NULL, false, NULL, NULL, NULL}
};
@@ -834,6 +854,24 @@ int main(int argc, char **argv, char **envp)
}
}
+#if defined(CONFIG_NATIVE_CALL)
+ /* Set the library for native bypass */
+ if (native_lib_path) {
+ if (g_file_test(native_lib_path, G_FILE_TEST_EXISTS)) {
+ GString *lib = g_string_new(native_lib_path);
+ lib = g_string_prepend(lib, "LD_PRELOAD=");
+ if (envlist_appendenv(envlist, g_string_free(lib, false), ":")) {
+ fprintf(stderr,
+ "failed to append the native library to environment.\n");
+ exit(EXIT_FAILURE);
+ }
+ } else {
+ fprintf(stderr, "native library %s does not exist.\n",
+ native_lib_path);
+ exit(EXIT_FAILURE);
+ }
+ }
+#endif
target_environ = envlist_to_environ(envlist, NULL);
envlist_free(envlist);
--
2.34.1
- Re: [RFC v4 01/11] build: Implement logic for sharing cross-building config files, (continued)
- [RFC v4 03/11] linux-user: Implement envlist_appendenv and add tests for envlist, Yeqi Fu, 2023/08/08
- [RFC v4 05/11] linux-user/elfload: Add support for parsing symbols of native libraries., Yeqi Fu, 2023/08/08
- [RFC v4 04/11] linux-user: Implement native-bypass option support,
Yeqi Fu <=
- [RFC v4 06/11] tcg: Add tcg opcodes and helpers for native library calls, Yeqi Fu, 2023/08/08
- [RFC v4 07/11] target/i386: Add support for native library calls, Yeqi Fu, 2023/08/08
- [RFC v4 08/11] target/mips: Add support for native library calls, Yeqi Fu, 2023/08/08
- [RFC v4 09/11] target/arm: Add support for native library calls, Yeqi Fu, 2023/08/08
- [RFC v4 10/11] tests/tcg/multiarch: Add nativecall.c test, Yeqi Fu, 2023/08/08