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Merge "riscv64: increase jmp_buf size." into main

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Treehugger Robot 2023-08-22 15:23:43 +00:00 committed by Gerrit Code Review
commit d4c9419441
1 changed files with 6 additions and 4 deletions
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10
libc/include/setjmp.h
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@ -66,12 +66,14 @@
/**
* The size in words of a riscv64 jmp_buf. Room for callee-saved registers,
* including floating point, stack pointer and program counter, various
* internal implementation details, and leaving some free space.
* internal implementation details, and leaving lots of free space.
*
* Coincidentally matches OpenBSD, though they also save/restore the
* floating point status register too.
* Deliberately very large given the uncertainty around the final form of
* hardware shadow stack, and the fact that x86-64 glibc needed to steal
* space from their enormous sigset_t (which we don't have) to be able to
* implement the CET shadow stack.
*/
#define _JBLEN 32
#define _JBLEN 64
#elif defined(__x86_64__)
/** The size in words of an x86-64 jmp_buf. Inherited from OpenBSD. */
#define _JBLEN 11