diff options
Diffstat (limited to 'Documentation/powerpc/syscall64-abi.rst')
| -rw-r--r-- | Documentation/powerpc/syscall64-abi.rst | 30 |
1 files changed, 16 insertions, 14 deletions
diff --git a/Documentation/powerpc/syscall64-abi.rst b/Documentation/powerpc/syscall64-abi.rst index 46caaadbb029..cf9b2857c72a 100644 --- a/Documentation/powerpc/syscall64-abi.rst +++ b/Documentation/powerpc/syscall64-abi.rst @@ -49,20 +49,22 @@ Register preservation rules Register preservation rules match the ELF ABI calling sequence with the following differences: -=========== ============= ======================================== ---- For the sc instruction, differences with the ELF ABI --- -r0 Volatile (System call number.) -r3 Volatile (Parameter 1, and return value.) -r4-r8 Volatile (Parameters 2-6.) -cr0 Volatile (cr0.SO is the return error condition.) -cr1, cr5-7 Nonvolatile -lr Nonvolatile - ---- For the scv 0 instruction, differences with the ELF ABI --- -r0 Volatile (System call number.) -r3 Volatile (Parameter 1, and return value.) -r4-r8 Volatile (Parameters 2-6.) -=========== ============= ======================================== ++------------------------------------------------------------------------+ +| For the sc instruction, differences with the ELF ABI | ++--------------+--------------+------------------------------------------+ +| r0 | Volatile | (System call number.) | +| rr3 | Volatile | (Parameter 1, and return value.) | +| rr4-r8 | Volatile | (Parameters 2-6.) | +| rcr0 | Volatile | (cr0.SO is the return error condition.) | +| rcr1, cr5-7 | Nonvolatile | | +| rlr | Nonvolatile | | ++--------------+--------------+------------------------------------------+ +| For the scv 0 instruction, differences with the ELF ABI | ++--------------+--------------+------------------------------------------+ +| r0 | Volatile | (System call number.) | +| r3 | Volatile | (Parameter 1, and return value.) | +| r4-r8 | Volatile | (Parameters 2-6.) | ++--------------+--------------+------------------------------------------+ All floating point and vector data registers as well as control and status registers are nonvolatile. |