GK SDK 源码库: XMIPCLinuxV100R005C00SPC030 (kernel/tools/open_source excluded)

source/trusted-firmware/trusted-firmware-a-2.8/services/std_svc/spm/common/aarch64/spm_helpers.S

@@ -0,0 +1,74 @@
+/*
+ * Copyright (c) 2017-2022, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <asm_macros.S>
+#include "spm_common.h"
+
+	.global spm_secure_partition_enter
+	.global spm_secure_partition_exit
+
+	/* ---------------------------------------------------------------------
+	 * This function is called with SP_EL0 as stack. Here we stash our EL3
+	 * callee-saved registers on to the stack as a part of saving the C
+	 * runtime and enter the secure payload.
+	 * 'x0' contains a pointer to the memory where the address of the C
+	 *  runtime context is to be saved.
+	 * ---------------------------------------------------------------------
+	 */
+func spm_secure_partition_enter
+	/* Make space for the registers that we're going to save */
+	mov	x3, sp
+	str	x3, [x0, #0]
+	sub	sp, sp, #SP_C_RT_CTX_SIZE
+
+	/* Save callee-saved registers on to the stack */
+	stp	x19, x20, [sp, #SP_C_RT_CTX_X19]
+	stp	x21, x22, [sp, #SP_C_RT_CTX_X21]
+	stp	x23, x24, [sp, #SP_C_RT_CTX_X23]
+	stp	x25, x26, [sp, #SP_C_RT_CTX_X25]
+	stp	x27, x28, [sp, #SP_C_RT_CTX_X27]
+	stp	x29, x30, [sp, #SP_C_RT_CTX_X29]
+
+	/* ---------------------------------------------------------------------
+	 * Everything is setup now. el3_exit() will use the secure context to
+	 * restore to the general purpose and EL3 system registers to ERET
+	 * into the secure payload.
+	 * ---------------------------------------------------------------------
+	 */
+	b	el3_exit
+endfunc spm_secure_partition_enter
+
+	/* ---------------------------------------------------------------------
+	 * This function is called with 'x0' pointing to a C runtime context
+	 * saved in spm_secure_partition_enter().
+	 * It restores the saved registers and jumps to that runtime with 'x0'
+	 * as the new SP register. This destroys the C runtime context that had
+	 * been built on the stack below the saved context by the caller. Later
+	 * the second parameter 'x1' is passed as a return value to the caller.
+	 * ---------------------------------------------------------------------
+	 */
+func spm_secure_partition_exit
+	/* Restore the previous stack */
+	mov	sp, x0
+
+	/* Restore callee-saved registers on to the stack */
+	ldp	x19, x20, [x0, #(SP_C_RT_CTX_X19 - SP_C_RT_CTX_SIZE)]
+	ldp	x21, x22, [x0, #(SP_C_RT_CTX_X21 - SP_C_RT_CTX_SIZE)]
+	ldp	x23, x24, [x0, #(SP_C_RT_CTX_X23 - SP_C_RT_CTX_SIZE)]
+	ldp	x25, x26, [x0, #(SP_C_RT_CTX_X25 - SP_C_RT_CTX_SIZE)]
+	ldp	x27, x28, [x0, #(SP_C_RT_CTX_X27 - SP_C_RT_CTX_SIZE)]
+	ldp	x29, x30, [x0, #(SP_C_RT_CTX_X29 - SP_C_RT_CTX_SIZE)]
+
+	/* ---------------------------------------------------------------------
+	 * This should take us back to the instruction after the call to the
+	 * last spm_secure_partition_enter().* Place the second parameter to x0
+	 * so that the caller will see it as a return value from the original
+	 * entry call.
+	 * ---------------------------------------------------------------------
+	 */
+	mov	x0, x1
+	ret
+endfunc spm_secure_partition_exit

source/trusted-firmware/trusted-firmware-a-2.8/services/std_svc/spm/common/include/spm_common.h

@@ -0,0 +1,42 @@
+/*
+ * Copyright (c) 2017-2022, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef SPM_COMMON_H
+#define SPM_COMMON_H
+
+#include <context.h>
+
+/*******************************************************************************
+ * Constants that allow assembler code to preserve callee-saved registers of the
+ * C runtime context while performing a security state switch.
+ ******************************************************************************/
+#define SP_C_RT_CTX_X19		0x0
+#define SP_C_RT_CTX_X20		0x8
+#define SP_C_RT_CTX_X21		0x10
+#define SP_C_RT_CTX_X22		0x18
+#define SP_C_RT_CTX_X23		0x20
+#define SP_C_RT_CTX_X24		0x28
+#define SP_C_RT_CTX_X25		0x30
+#define SP_C_RT_CTX_X26		0x38
+#define SP_C_RT_CTX_X27		0x40
+#define SP_C_RT_CTX_X28		0x48
+#define SP_C_RT_CTX_X29		0x50
+#define SP_C_RT_CTX_X30		0x58
+
+#define SP_C_RT_CTX_SIZE	0x60
+#define SP_C_RT_CTX_ENTRIES	(SP_C_RT_CTX_SIZE >> DWORD_SHIFT)
+
+#ifndef __ASSEMBLER__
+
+#include <stdint.h>
+
+/* Assembly helpers */
+uint64_t spm_secure_partition_enter(uint64_t *c_rt_ctx);
+void __dead2 spm_secure_partition_exit(uint64_t c_rt_ctx, uint64_t ret);
+
+#endif /* __ASSEMBLER__ */
+
+#endif /* SPM_COMMON_H */

source/trusted-firmware/trusted-firmware-a-2.8/services/std_svc/spm/common/spm.mk

@@ -0,0 +1,17 @@
+#
+# Copyright (c) 2022, ARM Limited and Contributors. All rights reserved.
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
+
+ifneq (${ARCH},aarch64)
+        $(error "Error: SPM is only supported on aarch64.")
+endif
+
+INCLUDES	+=	-Iservices/std_svc/spm/common/include
+
+SPM_SOURCES	:=	$(addprefix services/std_svc/spm/common/,\
+			${ARCH}/spm_helpers.S)
+
+# Let the top-level Makefile know that we intend to include a BL32 image
+NEED_BL32		:=	yes