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From: Corinna Vinschen <corinna@sourceware.org> To: newlib-cvs@sourceware.org Subject: [newlib-cygwin/main] RISC-V: Initialize the jvt CSR Date: Mon, 8 Jan 2024 12:12:27 +0000 (GMT) [thread overview] Message-ID: <20240108121228.04582385842D@sourceware.org> (raw) https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=573458e7fc4f5247874b139a17e7e54827c92440 commit 573458e7fc4f5247874b139a17e7e54827c92440 Author: Hau Hsu <hau.hsu@sifive.com> AuthorDate: Fri Jan 5 15:06:39 2024 +0800 Commit: Corinna Vinschen <corinna@vinschen.de> CommitDate: Mon Jan 8 13:12:06 2024 +0100 RISC-V: Initialize the jvt CSR Set symbol '__jvt_base$' as weak. So if the symbol is not set in the linker script, the address would be 0. We initialize jvt CSR only if the address is not 0. Also use csr number directly instead of using symbolic name to prevent the backward incompatible issue. psabi reference: https://github.com/riscv-non-isa/riscv-elf-psabi-doc/blob/2d770815dc9a8b11e61ea1abd487cb25ee56ad5e/riscv-elf.adoc#table-jump-relaxation Diff: --- libgloss/riscv/crt0.S | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/libgloss/riscv/crt0.S b/libgloss/riscv/crt0.S index 7a4e4e32c146..f1c5419a5eb4 100644 --- a/libgloss/riscv/crt0.S +++ b/libgloss/riscv/crt0.S @@ -26,6 +26,17 @@ _start: addi gp, gp, %pcrel_lo(1b) .option pop + /* Initialize jvt CSR (reg addr: 0x0017) */ + .weak __jvt_base$ + lla a0, __jvt_base$ + beqz a0, .Ljvt_init_end +.option push +.option norelax +.option arch, +zicsr + csrw 0x17, a0 +.option pop +.Ljvt_init_end: + # Clear the bss segment la a0, __bss_start la a2, _end
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