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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __BPF_MISC_H__
#define __BPF_MISC_H__
/* This set of attributes controls behavior of the
* test_loader.c:test_loader__run_subtests().
*
* The test_loader sequentially loads each program in a skeleton.
* Programs could be loaded in privileged and unprivileged modes.
* - __success, __failure, __msg imply privileged mode;
* - __success_unpriv, __failure_unpriv, __msg_unpriv imply
* unprivileged mode.
* If combination of privileged and unprivileged attributes is present
* both modes are used. If none are present privileged mode is implied.
*
* See test_loader.c:drop_capabilities() for exact set of capabilities
* that differ between privileged and unprivileged modes.
*
* For test filtering purposes the name of the program loaded in
* unprivileged mode is derived from the usual program name by adding
* `@unpriv' suffix.
*
* __msg Message expected to be found in the verifier log.
* Multiple __msg attributes could be specified.
* __msg_unpriv Same as __msg but for unprivileged mode.
*
* __success Expect program load success in privileged mode.
* __success_unpriv Expect program load success in unprivileged mode.
*
* __failure Expect program load failure in privileged mode.
* __failure_unpriv Expect program load failure in unprivileged mode.
*
* __retval Execute the program using BPF_PROG_TEST_RUN command,
* expect return value to match passed parameter:
* - a decimal number
* - a hexadecimal number, when starts from 0x
* - literal INT_MIN
* - literal POINTER_VALUE (see definition below)
* - literal TEST_DATA_LEN (see definition below)
* __retval_unpriv Same, but load program in unprivileged mode.
*
* __description Text to be used instead of a program name for display
* and filtering purposes.
*
* __log_level Log level to use for the program, numeric value expected.
*
* __flag Adds one flag use for the program, the following values are valid:
* - BPF_F_STRICT_ALIGNMENT;
* - BPF_F_TEST_RND_HI32;
* - BPF_F_TEST_STATE_FREQ;
* - BPF_F_SLEEPABLE;
* - BPF_F_XDP_HAS_FRAGS;
* - A numeric value.
* Multiple __flag attributes could be specified, the final flags
* value is derived by applying binary "or" to all specified values.
*
* __auxiliary Annotated program is not a separate test, but used as auxiliary
* for some other test cases and should always be loaded.
* __auxiliary_unpriv Same, but load program in unprivileged mode.
*/
#define __msg(msg) __attribute__((btf_decl_tag("comment:test_expect_msg=" msg)))
#define __failure __attribute__((btf_decl_tag("comment:test_expect_failure")))
#define __success __attribute__((btf_decl_tag("comment:test_expect_success")))
#define __description(desc) __attribute__((btf_decl_tag("comment:test_description=" desc)))
#define __msg_unpriv(msg) __attribute__((btf_decl_tag("comment:test_expect_msg_unpriv=" msg)))
#define __failure_unpriv __attribute__((btf_decl_tag("comment:test_expect_failure_unpriv")))
#define __success_unpriv __attribute__((btf_decl_tag("comment:test_expect_success_unpriv")))
#define __log_level(lvl) __attribute__((btf_decl_tag("comment:test_log_level="#lvl)))
#define __flag(flag) __attribute__((btf_decl_tag("comment:test_prog_flags="#flag)))
#define __retval(val) __attribute__((btf_decl_tag("comment:test_retval="#val)))
#define __retval_unpriv(val) __attribute__((btf_decl_tag("comment:test_retval_unpriv="#val)))
#define __auxiliary __attribute__((btf_decl_tag("comment:test_auxiliary")))
#define __auxiliary_unpriv __attribute__((btf_decl_tag("comment:test_auxiliary_unpriv")))
#define __btf_path(path) __attribute__((btf_decl_tag("comment:test_btf_path=" path)))
/* Convenience macro for use with 'asm volatile' blocks */
#define __naked __attribute__((naked))
#define __clobber_all "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "memory"
#define __clobber_common "r0", "r1", "r2", "r3", "r4", "r5", "memory"
#define __imm(name) [name]"i"(name)
#define __imm_const(name, expr) [name]"i"(expr)
#define __imm_addr(name) [name]"i"(&name)
#define __imm_ptr(name) [name]"p"(&name)
#define __imm_insn(name, expr) [name]"i"(*(long *)&(expr))
/* Magic constants used with __retval() */
#define POINTER_VALUE 0xcafe4all
#define TEST_DATA_LEN 64
#ifndef __used
#define __used __attribute__((used))
#endif
#if defined(__TARGET_ARCH_x86)
#define SYSCALL_WRAPPER 1
#define SYS_PREFIX "__x64_"
#elif defined(__TARGET_ARCH_s390)
#define SYSCALL_WRAPPER 1
#define SYS_PREFIX "__s390x_"
#elif defined(__TARGET_ARCH_arm64)
#define SYSCALL_WRAPPER 1
#define SYS_PREFIX "__arm64_"
#elif defined(__TARGET_ARCH_riscv)
#define SYSCALL_WRAPPER 1
#define SYS_PREFIX "__riscv_"
#else
#define SYSCALL_WRAPPER 0
#define SYS_PREFIX "__se_"
#endif
/* How many arguments are passed to function in register */
#if defined(__TARGET_ARCH_x86) || defined(__x86_64__)
#define FUNC_REG_ARG_CNT 6
#elif defined(__i386__)
#define FUNC_REG_ARG_CNT 3
#elif defined(__TARGET_ARCH_s390) || defined(__s390x__)
#define FUNC_REG_ARG_CNT 5
#elif defined(__TARGET_ARCH_arm) || defined(__arm__)
#define FUNC_REG_ARG_CNT 4
#elif defined(__TARGET_ARCH_arm64) || defined(__aarch64__)
#define FUNC_REG_ARG_CNT 8
#elif defined(__TARGET_ARCH_mips) || defined(__mips__)
#define FUNC_REG_ARG_CNT 8
#elif defined(__TARGET_ARCH_powerpc) || defined(__powerpc__) || defined(__powerpc64__)
#define FUNC_REG_ARG_CNT 8
#elif defined(__TARGET_ARCH_sparc) || defined(__sparc__)
#define FUNC_REG_ARG_CNT 6
#elif defined(__TARGET_ARCH_riscv) || defined(__riscv__)
#define FUNC_REG_ARG_CNT 8
#else
/* default to 5 for others */
#define FUNC_REG_ARG_CNT 5
#endif
/* make it look to compiler like value is read and written */
#define __sink(expr) asm volatile("" : "+g"(expr))
#endif
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