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https://github.com/brain-hackers/u-boot-brain
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94f536fc4f
The inline assembly functions in mon.c assume that the caller will check for the return value in r0 according to regular ARM calling conventions. However, this assumption breaks down if the compiler inlines the functions. The caller is then under no obligation to use r0 for the result. To fix this disconnect, we must explicitly move the return value from the smc/bl call to the variable that the function returns. Signed-off-by: Madan Srinivas <madans@ti.com> Reviewed-by: Tom Rini <trini@konsulko.com>
142 lines
3.0 KiB
C
142 lines
3.0 KiB
C
/*
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* K2HK: secure kernel command file
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*
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* (C) Copyright 2012-2014
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* Texas Instruments Incorporated, <www.ti.com>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <command.h>
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#include <mach/mon.h>
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#include <spl.h>
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asm(".arch_extension sec\n\t");
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int mon_install(u32 addr, u32 dpsc, u32 freq, u32 bm_addr)
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{
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int result;
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__asm__ __volatile__ (
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"stmfd r13!, {lr}\n"
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"mov r0, %1\n"
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"mov r1, %2\n"
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"mov r2, %3\n"
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"mov r3, %4\n"
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"blx r0\n"
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"mov %0, r0\n"
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"ldmfd r13!, {lr}\n"
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: "=&r" (result)
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: "r" (addr), "r" (dpsc), "r" (freq), "r" (bm_addr)
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: "cc", "r0", "r1", "r2", "r3", "memory");
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return result;
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}
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int mon_power_on(int core_id, void *ep)
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{
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int result;
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asm volatile (
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"stmfd r13!, {lr}\n"
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"mov r1, %1\n"
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"mov r2, %2\n"
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"mov r0, #0\n"
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"smc #0\n"
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"mov %0, r0\n"
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"ldmfd r13!, {lr}\n"
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: "=&r" (result)
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: "r" (core_id), "r" (ep)
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: "cc", "r0", "r1", "r2", "memory");
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return result;
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}
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int mon_power_off(int core_id)
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{
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int result;
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asm volatile (
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"stmfd r13!, {lr}\n"
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"mov r1, %1\n"
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"mov r0, #1\n"
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"smc #1\n"
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"mov %0, r0\n"
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"ldmfd r13!, {lr}\n"
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: "=&r" (result)
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: "r" (core_id)
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: "cc", "r0", "r1", "memory");
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return result;
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}
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#ifdef CONFIG_TI_SECURE_DEVICE
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#define KS2_HS_SEC_HEADER_LEN 0x60
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#define KS2_HS_SEC_TAG_OFFSET 0x34
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#define KS2_AUTH_CMD 130
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/**
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* k2_hs_bm_auth() - Invokes security functions using a
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* proprietary TI interface. This binary and source for
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* this is available in the secure development package or
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* SECDEV. For details on how to access this please refer
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* doc/README.ti-secure
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*
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* @cmd: Secure monitor command
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* @arg1: Argument for command
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*
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* returns non-zero value on success, zero on error
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*/
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static int k2_hs_bm_auth(int cmd, void *arg1)
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{
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int result;
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asm volatile (
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"stmfd r13!, {r4-r12, lr}\n"
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"mov r0, %1\n"
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"mov r1, %2\n"
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"smc #2\n"
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"mov %0, r0\n"
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"ldmfd r13!, {r4-r12, lr}\n"
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: "=&r" (result)
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: "r" (cmd), "r" (arg1)
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: "cc", "r0", "r1", "memory");
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return result;
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}
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void board_fit_image_post_process(void **p_image, size_t *p_size)
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{
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int result = 0;
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void *image = *p_image;
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if (strncmp(image + KS2_HS_SEC_TAG_OFFSET, "KEYS", 4)) {
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printf("No signature found in image!\n");
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hang();
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}
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result = k2_hs_bm_auth(KS2_AUTH_CMD, image);
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if (result == 0) {
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printf("Authentication failed!\n");
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hang();
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}
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/*
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* Overwrite the image headers after authentication
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* and decryption. Update size to reflect removal
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* of header.
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*/
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*p_size -= KS2_HS_SEC_HEADER_LEN;
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memcpy(image, image + KS2_HS_SEC_HEADER_LEN, *p_size);
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/*
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* Output notification of successful authentication to re-assure the
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* user that the secure code is being processed as expected. However
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* suppress any such log output in case of building for SPL and booting
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* via YMODEM. This is done to avoid disturbing the YMODEM serial
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* protocol transactions.
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*/
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if (!(IS_ENABLED(CONFIG_SPL_BUILD) &&
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IS_ENABLED(CONFIG_SPL_YMODEM_SUPPORT) &&
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spl_boot_device() == BOOT_DEVICE_UART))
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printf("Authentication passed\n");
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}
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#endif
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