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sgx.h
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ /* * Copyright(c) 2016-20 Intel Corporation. */ #ifndef _ASM_X86_SGX_H #define _ASM_X86_SGX_H #include <linux/types.h> #include <linux/ioctl.h> /** * enum sgx_page_flags - page control flags * %SGX_PAGE_MEASURE: Measure the page contents with a sequence of * ENCLS[EEXTEND] operations. */ enum sgx_page_flags { SGX_PAGE_MEASURE = 0x01, }; #define SGX_MAGIC 0xA4 #define SGX_IOC_ENCLAVE_CREATE \ _IOW(SGX_MAGIC, 0x00, struct sgx_enclave_create) #define SGX_IOC_ENCLAVE_ADD_PAGES \ _IOWR(SGX_MAGIC, 0x01, struct sgx_enclave_add_pages) #define SGX_IOC_ENCLAVE_INIT \ _IOW(SGX_MAGIC, 0x02, struct sgx_enclave_init) #define SGX_IOC_ENCLAVE_PROVISION \ _IOW(SGX_MAGIC, 0x03, struct sgx_enclave_provision) #define SGX_IOC_VEPC_REMOVE_ALL \ _IO(SGX_MAGIC, 0x04) #define SGX_IOC_ENCLAVE_RESTRICT_PERMISSIONS \ _IOWR(SGX_MAGIC, 0x05, struct sgx_enclave_restrict_permissions) #define SGX_IOC_ENCLAVE_MODIFY_TYPES \ _IOWR(SGX_MAGIC, 0x06, struct sgx_enclave_modify_types) #define SGX_IOC_ENCLAVE_REMOVE_PAGES \ _IOWR(SGX_MAGIC, 0x07, struct sgx_enclave_remove_pages) /** * struct sgx_enclave_create - parameter structure for the * %SGX_IOC_ENCLAVE_CREATE ioctl * @src: address for the SECS page data */ struct sgx_enclave_create { __u64 src; }; /** * struct sgx_enclave_add_pages - parameter structure for the * %SGX_IOC_ENCLAVE_ADD_PAGE ioctl * @src: start address for the page data * @offset: starting page offset * @length: length of the data (multiple of the page size) * @secinfo: address for the SECINFO data * @flags: page control flags * @count: number of bytes added (multiple of the page size) */ struct sgx_enclave_add_pages { __u64 src; __u64 offset; __u64 length; __u64 secinfo; __u64 flags; __u64 count; }; /** * struct sgx_enclave_init - parameter structure for the * %SGX_IOC_ENCLAVE_INIT ioctl * @sigstruct: address for the SIGSTRUCT data */ struct sgx_enclave_init { __u64 sigstruct; }; /** * struct sgx_enclave_provision - parameter structure for the * %SGX_IOC_ENCLAVE_PROVISION ioctl * @fd: file handle of /dev/sgx_provision */ struct sgx_enclave_provision { __u64 fd; }; /** * struct sgx_enclave_restrict_permissions - parameters for ioctl * %SGX_IOC_ENCLAVE_RESTRICT_PERMISSIONS * @offset: starting page offset (page aligned relative to enclave base * address defined in SECS) * @length: length of memory (multiple of the page size) * @permissions:new permission bits for pages in range described by @offset * and @length * @result: (output) SGX result code of ENCLS[EMODPR] function * @count: (output) bytes successfully changed (multiple of page size) */ struct sgx_enclave_restrict_permissions { __u64 offset; __u64 length; __u64 permissions; __u64 result; __u64 count; }; /** * struct sgx_enclave_modify_types - parameters for ioctl * %SGX_IOC_ENCLAVE_MODIFY_TYPES * @offset: starting page offset (page aligned relative to enclave base * address defined in SECS) * @length: length of memory (multiple of the page size) * @page_type: new type for pages in range described by @offset and @length * @result: (output) SGX result code of ENCLS[EMODT] function * @count: (output) bytes successfully changed (multiple of page size) */ struct sgx_enclave_modify_types { __u64 offset; __u64 length; __u64 page_type; __u64 result; __u64 count; }; /** * struct sgx_enclave_remove_pages - %SGX_IOC_ENCLAVE_REMOVE_PAGES parameters * @offset: starting page offset (page aligned relative to enclave base * address defined in SECS) * @length: length of memory (multiple of the page size) * @count: (output) bytes successfully changed (multiple of page size) * * Regular (PT_REG) or TCS (PT_TCS) can be removed from an initialized * enclave if the system supports SGX2. First, the %SGX_IOC_ENCLAVE_MODIFY_TYPES * ioctl() should be used to change the page type to PT_TRIM. After that * succeeds ENCLU[EACCEPT] should be run from within the enclave and then * %SGX_IOC_ENCLAVE_REMOVE_PAGES can be used to complete the page removal. */ struct sgx_enclave_remove_pages { __u64 offset; __u64 length; __u64 count; }; struct sgx_enclave_run; /** * typedef sgx_enclave_user_handler_t - Exit handler function accepted by * __vdso_sgx_enter_enclave() * @run: The run instance given by the caller * * The register parameters contain the snapshot of their values at enclave * exit. An invalid ENCLU function number will cause -EINVAL to be returned * to the caller. * * Return: * - <= 0: The given value is returned back to the caller. * - > 0: ENCLU function to invoke, either EENTER or ERESUME. */ typedef int (*sgx_enclave_user_handler_t)(long rdi, long rsi, long rdx, long rsp, long r8, long r9, struct sgx_enclave_run *run); /** * struct sgx_enclave_run - the execution context of __vdso_sgx_enter_enclave() * @tcs: TCS used to enter the enclave * @function: The last seen ENCLU function (EENTER, ERESUME or EEXIT) * @exception_vector: The interrupt vector of the exception * @exception_error_code: The exception error code pulled out of the stack * @exception_addr: The address that triggered the exception * @user_handler: User provided callback run on exception * @user_data: Data passed to the user handler * @reserved Reserved for future extensions * * If @user_handler is provided, the handler will be invoked on all return paths * of the normal flow. The user handler may transfer control, e.g. via a * longjmp() call or a C++ exception, without returning to * __vdso_sgx_enter_enclave(). */ struct sgx_enclave_run { __u64 tcs; __u32 function; __u16 exception_vector; __u16 exception_error_code; __u64 exception_addr; __u64 user_handler; __u64 user_data; __u8 reserved[216]; }; /** * typedef vdso_sgx_enter_enclave_t - Prototype for __vdso_sgx_enter_enclave(), * a vDSO function to enter an SGX enclave. * @rdi: Pass-through value for RDI * @rsi: Pass-through value for RSI * @rdx: Pass-through value for RDX * @function: ENCLU function, must be EENTER or ERESUME * @r8: Pass-through value for R8 * @r9: Pass-through value for R9 * @run: struct sgx_enclave_run, must be non-NULL * * NOTE: __vdso_sgx_enter_enclave() does not ensure full compliance with the * x86-64 ABI, e.g. doesn't handle XSAVE state. Except for non-volatile * general purpose registers, EFLAGS.DF, and RSP alignment, preserving/setting * state in accordance with the x86-64 ABI is the responsibility of the enclave * and its runtime, i.e. __vdso_sgx_enter_enclave() cannot be called from C * code without careful consideration by both the enclave and its runtime. * * All general purpose registers except RAX, RBX and RCX are passed as-is to the * enclave. RAX, RBX and RCX are consumed by EENTER and ERESUME and are loaded * with @function, asynchronous exit pointer, and @run.tcs respectively. * * RBP and the stack are used to anchor __vdso_sgx_enter_enclave() to the * pre-enclave state, e.g. to retrieve @run.exception and @run.user_handler * after an enclave exit. All other registers are available for use by the * enclave and its runtime, e.g. an enclave can push additional data onto the * stack (and modify RSP) to pass information to the optional user handler (see * below). * * Most exceptions reported on ENCLU, including those that occur within the * enclave, are fixed up and reported synchronously instead of being delivered * via a standard signal. Debug Exceptions (#DB) and Breakpoints (#BP) are * never fixed up and are always delivered via standard signals. On synchrously * reported exceptions, -EFAULT is returned and details about the exception are * recorded in @run.exception, the optional sgx_enclave_exception struct. * * Return: * - 0: ENCLU function was successfully executed. * - -EINVAL: Invalid ENCL number (neither EENTER nor ERESUME). */ typedef int (*vdso_sgx_enter_enclave_t)(unsigned long rdi, unsigned long rsi, unsigned long rdx, unsigned int function, unsigned long r8, unsigned long r9, struct sgx_enclave_run *run); #endif /* _ASM_X86_SGX_H */
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