| /* |
| * Copyright 2018, Data61, CSIRO (ABN 41 687 119 230) |
| * |
| * SPDX-License-Identifier: BSD-2-Clause |
| */ |
| #include <autoconf.h> |
| #include <utils/gen_config.h> |
| #include <utils/stack.h> |
| |
| void * |
| utils_run_on_stack(void *stack_top, void * (*func)(void *arg), void *arg) |
| { |
| void *ret; |
| asm volatile ( |
| "mv s0, sp\n\t" /* Save sp - s0 is callee saved so we don't need to save it. */ |
| "mv sp, %[new_stack]\n\t" /* Switch to new stack. */ |
| "mv a0, %[arg]\n\t" /* Setup argument to func. */ |
| "jalr %[func]\n\t" |
| "mv sp, s0\n\t" |
| "mv %[ret], a0\n\t" |
| : [ret] "=r" (ret) |
| : [new_stack] "r" (stack_top), |
| [func] "r" (func), |
| [arg] "r" (arg) |
| /* caller saved registers */ |
| : "t0", "t1", "t2", "t3", "t4", "t5", "t6", "a0", "a1", "a2", "a3", "a4", "a5", "a6", "a7", "ra"); |
| return ret; |
| } |
