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0a48860c27
Author: Alex Suykov <alex.suykov@gmail.com> Author: Aric Belsito <lluixhi@gmail.com> Author: Drew DeVault <sir@cmpwn.com> Author: Michael Clark <mjc@sifive.com> Author: Michael Forney <mforney@mforney.org> Author: Stefan O'Rear <sorear2@gmail.com> 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.
35 lines
697 B
C
35 lines
697 B
C
#define a_barrier a_barrier
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static inline void a_barrier()
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{
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__asm__ __volatile__ ("fence rw,rw" : : : "memory");
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}
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#define a_cas a_cas
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static inline int a_cas(volatile int *p, int t, int s)
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{
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int old, tmp;
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__asm__("\n1: lr.w.aqrl %0, %2\n"
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" bne %0, %3, 1f\n"
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" sc.w.aqrl %1, %4, %2\n"
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" bnez %1, 1b\n"
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"1:"
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: "=&r"(old), "+r"(tmp), "+A"(*p)
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: "r"(t), "r"(s));
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return old;
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}
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#define a_cas_p a_cas_p
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static inline void *a_cas_p(volatile void *p, void *t, void *s)
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{
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void *old;
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int tmp;
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__asm__("\n1: lr.d.aqrl %0, %2\n"
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" bne %0, %3, 1f\n"
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" sc.d.aqrl %1, %4, %2\n"
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" bnez %1, 1b\n"
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"1:"
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: "=&r"(old), "+r"(tmp), "+A"(*(long *)p)
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: "r"(t), "r"(s));
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return old;
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}
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