Tidy the _set_tp function for RISC-V.
- Use a constant for the offset instead of a magic number. - Use an addi instruction that writes to tp directly instead of a mv that writes the result of a compiler-generated addi. Reviewed by: mhorne MFC after: 1 week Sponsored by: DARPA Differential Revision: https://reviews.freebsd.org/D23521
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svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=357643
@ -38,13 +38,14 @@ __FBSDID("$FreeBSD$");
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#include <string.h>
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#include <sys/types.h>
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#include <machine/sysarch.h>
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#include <stdlib.h>
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/* NB: size of 'struct tcb'. */
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#define TP_OFFSET (sizeof(void *) * 2)
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void
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_set_tp(void *tp)
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{
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__asm __volatile("mv tp, %0" :: "r"((char*)tp + 0x10));
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__asm __volatile("addi tp, %0, %1" :: "r" (tp), "I" (TP_OFFSET));
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}
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