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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
* Copyright(c) 2016-20 Intel Corporation.
*/
#ifndef _UAPI_ASM_X86_SGX_H
#define _UAPI_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)
/**
* 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_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 /* _UAPI_ASM_X86_SGX_H */
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