mirror of
https://github.com/zephyrproject-rtos/zephyr
synced 2025-09-14 11:21:57 +00:00
990bf16206
This used to exist because in earlier versions of the system call interfaces, an "extern" declaration of the system call implementation function would precede the real inline version of the implementation. The compiler would not like this and would throw "static declaration of ‘foo’ follows non-static declaration". So alternate macros were needed which declare the implementation function as 'static inline' instead of extern. However, currently the inline version of these system call implementations appear first, the K_SYSCALL_DECLARE() macros appear in the header generated by gen_syscalls.py, which is always included at the end of the header file. The compiler does not complain if a static inline function is succeeded by an extern prototype of the same function. This lets us simplify the generated system call macros and just use __syscall everywhere. The disassembly of this was checked on x86 to ensure that for kernel-only or CONFIG_USERSPACE=n scenarios, everything is still being inlined as expected. Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
115 lines
3.0 KiB
Python
Executable File
115 lines
3.0 KiB
Python
Executable File
#!/usr/bin/env python3
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#
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# Copyright (c) 2017 Intel Corporation
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#
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# SPDX-License-Identifier: Apache-2.0
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import sys
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def gen_macro(ret, argc):
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sys.stdout.write("K_SYSCALL_DECLARE%d%s(id, name" % (argc,
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("" if ret else "_VOID")))
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if (ret):
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sys.stdout.write(", ret")
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for i in range(argc):
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sys.stdout.write(", t%d, p%d" % (i, i))
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sys.stdout.write(")")
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def gen_fn(ret, argc, name, extern=False):
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sys.stdout.write("\t%s %s %s(" %
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(("extern" if extern else "static inline"),
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("ret" if ret else "void"), name))
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if argc == 0:
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sys.stdout.write("void");
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else:
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for i in range(argc):
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sys.stdout.write("t%d p%d" % (i, i))
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if i != (argc - 1):
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sys.stdout.write(", ")
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sys.stdout.write(")")
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def gen_make_syscall(ret, argc):
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if (ret):
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sys.stdout.write("return (ret)")
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if (argc <= 6):
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sys.stdout.write("_arch")
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sys.stdout.write("_syscall_invoke%d(" % (argc))
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for i in range(argc):
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sys.stdout.write("(u32_t)p%d, " % (i))
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sys.stdout.write("id); \\\n")
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def gen_call_impl(ret, argc):
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if (ret):
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sys.stdout.write("return ")
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sys.stdout.write("_impl_##name(")
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for i in range(argc):
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sys.stdout.write("p%d" % (i))
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if i != (argc - 1):
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sys.stdout.write(", ")
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sys.stdout.write("); \\\n")
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def newline():
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sys.stdout.write(" \\\n")
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def gen_defines_inner(ret, argc, kernel_only=False, user_only=False):
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sys.stdout.write("#define ")
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gen_macro(ret, argc)
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newline()
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if not user_only:
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gen_fn(ret, argc, "_impl_##name", extern=True)
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sys.stdout.write(";")
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newline()
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gen_fn(ret, argc, "name");
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newline()
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sys.stdout.write("\t{")
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newline()
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if kernel_only:
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sys.stdout.write("\t\t")
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gen_call_impl(ret, argc)
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elif user_only:
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sys.stdout.write("\t\t")
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gen_make_syscall(ret, argc)
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else:
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sys.stdout.write("\t\tif (_is_user_context()) {")
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newline()
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sys.stdout.write("\t\t\t")
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gen_make_syscall(ret, argc)
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sys.stdout.write("\t\t} else {")
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newline()
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sys.stdout.write("\t\t\t")
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gen_call_impl(ret, argc)
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sys.stdout.write("\t\t}")
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newline()
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sys.stdout.write("\t}\n\n")
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def gen_defines(argc, kernel_only=False, user_only=False):
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gen_defines_inner(False, argc, kernel_only, user_only)
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gen_defines_inner(True, argc, kernel_only, user_only)
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sys.stdout.write("/* Auto-generated by gen_syscall_header.py, do not edit! */\n\n")
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sys.stdout.write("#ifndef GEN_SYSCALL_H\n#define GEN_SYSCALL_H\n\n")
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for i in range(11):
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sys.stdout.write("#if !defined(CONFIG_USERSPACE) || defined(__ZEPHYR_KERNEL__)\n")
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gen_defines(i, kernel_only=True)
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sys.stdout.write("#elif defined(__ZEPHYR_USER__)\n")
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gen_defines(i, user_only=True)
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sys.stdout.write("#else /* mixed kernel/user macros */\n")
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gen_defines(i)
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sys.stdout.write("#endif /* mixed kernel/user macros */\n\n")
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sys.stdout.write("#endif /* GEN_SYSCALL_H */\n")
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