From 0a48860c27a8eb291bcc7616ea9eb073dc660cab Mon Sep 17 00:00:00 2001 From: Rich Felker Date: Fri, 24 May 2019 10:46:08 -0400 Subject: add riscv64 architecture support Author: Alex Suykov Author: Aric Belsito Author: Drew DeVault Author: Michael Clark Author: Michael Forney Author: Stefan O'Rear This port has involved the work of many people over several years. I have tried to ensure that everyone with substantial contributions has been credited above; if any omissions are found they will be noted later in an update to the authors/contributors list in the COPYRIGHT file. The version committed here comes from the riscv/riscv-musl repo's commit 3fe7e2c75df78eef42dcdc352a55757729f451e2, with minor changes by me for issues found during final review: - a_ll/a_sc atomics are removed (according to the ISA spec, lr/sc are not safe to use in separate inline asm fragments) - a_cas[_p] is fixed to be a memory barrier - the call from the _start assembly into the C part of crt1/ldso is changed to allow for the possibility that the linker does not place them nearby each other. - DTP_OFFSET is defined correctly so that local-dynamic TLS works - reloc.h LDSO_ARCH logic is simplified and made explicit. - unused, non-functional crti/n asm files are removed. - an empty .sdata section is added to crt1 so that the __global_pointer reference is resolvable. - indentation style errors in some asm files are fixed. --- src/linux/cache.c | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) (limited to 'src/linux') diff --git a/src/linux/cache.c b/src/linux/cache.c index 84a138a4..0eb051c2 100644 --- a/src/linux/cache.c +++ b/src/linux/cache.c @@ -1,4 +1,6 @@ +#include #include "syscall.h" +#include "atomic.h" #ifdef SYS_cacheflush int _flush_cache(void *addr, int len, int op) @@ -15,3 +17,34 @@ int __cachectl(void *addr, int len, int op) } weak_alias(__cachectl, cachectl); #endif + +#ifdef SYS_riscv_flush_icache + +#define VDSO_FLUSH_ICACHE_SYM "__vdso_flush_icache" +#define VDSO_FLUSH_ICACHE_VER "LINUX_4.5" + +static void *volatile vdso_func; + +static int flush_icache_init(void *start, void *end, unsigned long int flags) +{ + void *p = __vdsosym(VDSO_FLUSH_ICACHE_VER, VDSO_FLUSH_ICACHE_SYM); + int (*f)(void *, void *, unsigned long int) = + (int (*)(void *, void *, unsigned long int))p; + a_cas_p(&vdso_func, (void *)flush_icache_init, p); + return f ? f(start, end, flags) : -ENOSYS; +} + +static void *volatile vdso_func = (void *)flush_icache_init; + +int __riscv_flush_icache(void *start, void *end, unsigned long int flags) +{ + int (*f)(void *, void *, unsigned long int) = + (int (*)(void *, void *, unsigned long int))vdso_func; + if (f) { + int r = f(start, end, flags); + if (!r) return r; + if (r != -ENOSYS) return __syscall_ret(r); + } +} +weak_alias(__riscv_flush_icache, riscv_flush_icache); +#endif -- cgit v1.2.1