103 lines
3 KiB
C
103 lines
3 KiB
C
/*
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* Copyright (c) 2015 Samsung Electronics Co., Ltd.
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* Authors: James Gleeson <jagleeso@gmail.com>
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* Wenbo Shen <wenbo.s@samsung.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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*/
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#ifndef __RKP_CFP_H__
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#define __RKP_CFP_H__
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/* We've reserved x16, x17, and x18 using GCC options:
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* KCFLAGS="-ffixed-x16 -ffixed-17 -ffixed-x18"
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* (RR = reserved register).
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*
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* Choose RRK to be x17, since x17 is used the least frequently in low-level assembly code already.
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*/
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#define RRX x16
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#define RRX_32 w16
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#define RRX_NUM 16
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#define RRK x17
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#define RRK_NUM 17
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#define RRS x18
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#define RRS_32 w18
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#define RRS_NUM 18
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/* Can't include TI_RRK from asm/asm-offsets.h due to conflicts (it's meant for assembly),
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* nor can we use offsetof.
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* Include this in asm/rkp_cfp.h and check consistency there.
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*/
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#define TI_RRK_AGAIN 88
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#ifndef __ASSEMBLY__
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extern unsigned long dump_stack_dec;
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struct task_struct;
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//two wrappers for replace and stringify
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#define _STR(x) #x
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#define STR(x) _STR(x)
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#ifdef CONFIG_RKP_CFP_ROPP
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void rkp_cfp_ropp_change_keys(struct task_struct *p);
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void reencrypt_task_return_addresses(struct task_struct * tsk, unsigned long);
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void reencrypt_return_addresses(unsigned long);
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#endif // CONFIG_RKP_CFP_ROPP
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#ifdef CONFIG_RKP_CFP_FIX_SMC_BUG
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#define PRE_SMC_INLINE \
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"stp " STR(RRX) ", " STR(RRS) ", [sp, #-16]!\n" \
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#ifdef CONFIG_RKP_CFP_ROPP_HYPKEY
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#define POST_SMC_INLINE \
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"dsb sy\n" \
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"isb\n" \
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/* "get_thread_info " STR(RRK) "\n" */ \
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"mov " STR(RRX) ", sp\n" \
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"and " STR(RRX) ", " STR(RRX) ", #" STR(~(THREAD_SIZE - 1)) " // top of stack\n" \
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/* load key from hypervisor */ \
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"stp x0, x1, [sp, #-16]!\n" \
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"mov x0, #0x3000\n" \
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"movk x0, #0x8389, lsl #16\n" \
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"mov x1, " STR(RRX) "\n" \
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"add x1, x1, #" STR(TI_RRK_AGAIN) "\n" \
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"hvc #0\n" \
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"ldp x0, x1, [sp], #16\n" \
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/*load RRX and RRS*/ \
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"ldp " STR(RRX) ", " STR(RRS) ", [sp], #16\n"
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#else //CONFIG_RKP_CFP_ROPP_HYPKEY
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#define POST_SMC_INLINE \
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"dsb sy\n" \
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"isb\n" \
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/* "get_thread_info " STR(RRK) "\n" */ \
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"mov " STR(RRX) ", sp\n" \
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"and " STR(RRX) ", " STR(RRX) ", #" STR(~(THREAD_SIZE - 1)) " // top of stack\n" \
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/* "load_key " STR(RRK) "\n" */ \
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"ldr " STR(RRK) ", [" STR(RRX) " , #" STR(TI_RRK_AGAIN) " ]\n" \
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"ldp " STR(RRX) ", " STR(RRS) ", [sp], #16\n"
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#endif //CONFIG_RKP_CFP_ROPP_HYPKEY
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#endif // CONFIG_RKP_CFP_FIX_SMC_BUG
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#endif //__ASSEMBLY__
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#endif //__RKP_CFP_H__
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