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Diffstat (limited to 'doc/cpu_supplement/sparc.t')
| -rw-r--r-- | doc/cpu_supplement/sparc.t | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/doc/cpu_supplement/sparc.t b/doc/cpu_supplement/sparc.t index a6862c8aa2..d0b7641e28 100644 --- a/doc/cpu_supplement/sparc.t +++ b/doc/cpu_supplement/sparc.t @@ -401,6 +401,11 @@ The registers g2 through g4 are reserved for applications. GCC uses them as volatile registers by default. So they are treated like volatile registers in RTEMS as well. +The register g6 is reserved for the operating system and contains the address +of the per-CPU control block of the current processor. This register is +initialized during system start and then remains unchanged. It is not +saved/restored by the context switch or interrupt processing code. + The register g7 is reserved for the operating system and contains the thread pointer used for thread-local storage (TLS) as mandated by the SPARC ABI. |