diff --git a/meson.build b/meson.build index e52b427..3457bbd 100644 --- a/meson.build +++ b/meson.build @@ -86,6 +86,8 @@ elif arch == 'arm' bitness = 32 elif arch == 'aarch64' bitness = 64 +elif arch == 'riscv64' + bitness = 64 else error('Architecture "@0@" is not supported.'.format(arch)) endif diff --git a/src/asm/trampoline-riscv64.S b/src/asm/trampoline-riscv64.S new file mode 100644 index 0000000..d7bda6c --- /dev/null +++ b/src/asm/trampoline-riscv64.S @@ -0,0 +1,60 @@ +/* + * The MIT License (MIT) + * + * Copyright © 2018 Franklin "Snaipe" Mathieu + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + * THE SOFTWARE. + */ +#include "config.h" +#include "mangling.h" + +#ifdef ASSEMBLER_SUPPORTS_HIDDEN +.hidden MANGLE(bxfi_trampoline) +#endif +.globl MANGLE(bxfi_trampoline) +MANGLE(bxfi_trampoline): + ld a0, addr_data + jr a0 + +/* + * On riscv64gc, these will expand into 3 instructions: + * auipc a0, 0x0 4 bytes + * ld a0, offset(a0) 4 bytes + * jr a0 2 bytes + * + * 'offset' is the length between `auipc` and `addr_data`. + */ + +.align 1 + +#ifdef ASSEMBLER_SUPPORTS_HIDDEN +.hidden MANGLE(bxfi_trampoline_addr) +#endif +.globl MANGLE(bxfi_trampoline_addr) +MANGLE(bxfi_trampoline_addr): +addr_data: +.fill 8, 1, 0 + +#ifdef ASSEMBLER_SUPPORTS_HIDDEN +.hidden MANGLE(bxfi_trampoline_end) +#endif +.globl MANGLE(bxfi_trampoline_end) +MANGLE(bxfi_trampoline_end): + +#include "stackfix.h"