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. --- arch/riscv64/reloc.h | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) create mode 100644 arch/riscv64/reloc.h (limited to 'arch/riscv64/reloc.h') diff --git a/arch/riscv64/reloc.h b/arch/riscv64/reloc.h new file mode 100644 index 00000000..1ca13811 --- /dev/null +++ b/arch/riscv64/reloc.h @@ -0,0 +1,22 @@ +#if defined __riscv_float_abi_soft +#define RISCV_FP_SUFFIX "-sf" +#elif defined __riscv_float_abi_single +#define RISCV_FP_SUFFIX "-sp" +#elif defined __riscv_float_abi_double +#define RISCV_FP_SUFFIX "" +#endif + +#define LDSO_ARCH "riscv64" RISCV_FP_SUFFIX + +#define TPOFF_K 0 + +#define REL_SYMBOLIC R_RISCV_64 +#define REL_PLT R_RISCV_JUMP_SLOT +#define REL_RELATIVE R_RISCV_RELATIVE +#define REL_COPY R_RISCV_COPY +#define REL_DTPMOD R_RISCV_TLS_DTPMOD64 +#define REL_DTPOFF R_RISCV_TLS_DTPREL64 +#define REL_TPOFF R_RISCV_TLS_TPREL64 + +#define CRTJMP(pc,sp) __asm__ __volatile__( \ + "mv sp, %1 ; jr %0" : : "r"(pc), "r"(sp) : "memory" ) -- cgit v1.2.3-70-g09d2