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| author | Andrew Waterman <andrew@sifive.com> | 2018-02-07 20:12:45 -0800 |
|---|---|---|
| committer | Andrew Waterman <andrew@sifive.com> | 2018-02-07 20:13:07 -0800 |
| commit | 936150c05957ff6ab99047f70695417aff1cfb29 (patch) | |
| tree | c4e96fd673ece9c9e287c97b82bc13e5e59608a6 /src/a.tex | |
| parent | ac2fe91755833a226cd11fef0e32e391bb5fecd1 (diff) | |
| download | riscv-isa-manual-936150c05957ff6ab99047f70695417aff1cfb29.zip riscv-isa-manual-936150c05957ff6ab99047f70695417aff1cfb29.tar.gz riscv-isa-manual-936150c05957ff6ab99047f70695417aff1cfb29.tar.bz2 | |
Add commentary about LR/SC forward-progress guarantee
Diffstat (limited to 'src/a.tex')
| -rw-r--r-- | src/a.tex | 5 |
1 files changed, 5 insertions, 0 deletions
@@ -202,6 +202,11 @@ that can be spent in the sequence. Floating-point operations and integer multiply/divide were disallowed to simplify the operating system's emulation of these instructions on implementations lacking appropriate hardware support. + +Although software is not forbidden from using LR/SC sequences that do not meet +the forward-progress constraints, portable software must detect the case that +the sequence repeatedly fails, then fall back to an alternate code sequence +that does not run afoul of the forward-progress constraints. \end{commentary} An implementation can reserve an arbitrary subset of the memory space |