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docs: powerpc: Fix tables in syscall64-abi.rst
Commit209b44c804
("docs: powerpc: syscall64-abi.rst: fix a malformed table") attempted to fix the formatting of tables in syscall64-abi.rst, but inadvertently changed some register names. Redo the tables with the correct register names, and while we're here, clean things up to separate the registers into different rows and add headings. Fixes:209b44c804
("docs: powerpc: syscall64-abi.rst: fix a malformed table") Signed-off-by: Andrew Donnellan <ajd@linux.ibm.com> Link: https://lore.kernel.org/r/20210225060857.16083-1-ajd@linux.ibm.com Signed-off-by: Jonathan Corbet <corbet@lwn.net>
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@ -46,25 +46,38 @@ stack frame LR and CR save fields are not used.
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Register preservation rules
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---------------------------
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Register preservation rules match the ELF ABI calling sequence with the
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following differences:
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Register preservation rules match the ELF ABI calling sequence with some
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differences.
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+------------------------------------------------------------------------+
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| For the sc instruction, differences with the ELF ABI |
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+--------------+--------------+------------------------------------------+
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| r0 | Volatile | (System call number.) |
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| rr3 | Volatile | (Parameter 1, and return value.) |
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| rr4-r8 | Volatile | (Parameters 2-6.) |
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| rcr0 | Volatile | (cr0.SO is the return error condition.) |
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| rcr1, cr5-7 | Nonvolatile | |
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| rlr | Nonvolatile | |
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+--------------+--------------+------------------------------------------+
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| For the scv 0 instruction, differences with the ELF ABI |
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+--------------+--------------+------------------------------------------+
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| r0 | Volatile | (System call number.) |
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| r3 | Volatile | (Parameter 1, and return value.) |
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| r4-r8 | Volatile | (Parameters 2-6.) |
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+--------------+--------------+------------------------------------------+
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For the sc instruction, the differences from the ELF ABI are as follows:
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+--------------+--------------------+-----------------------------------------+
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| Register | Preservation Rules | Purpose |
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+==============+====================+=========================================+
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| r0 | Volatile | (System call number.) |
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+--------------+--------------------+-----------------------------------------+
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| r3 | Volatile | (Parameter 1, and return value.) |
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+--------------+--------------------+-----------------------------------------+
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| r4-r8 | Volatile | (Parameters 2-6.) |
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+--------------+--------------------+-----------------------------------------+
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| cr0 | Volatile | (cr0.SO is the return error condition.) |
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+--------------+--------------------+-----------------------------------------+
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| cr1, cr5-7 | Nonvolatile | |
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+--------------+--------------------+-----------------------------------------+
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| lr | Nonvolatile | |
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+--------------+--------------------+-----------------------------------------+
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For the scv 0 instruction, the differences from the ELF ABI are as follows:
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+--------------+--------------------+-----------------------------------------+
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| Register | Preservation Rules | Purpose |
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+==============+====================+=========================================+
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| r0 | Volatile | (System call number.) |
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+--------------+--------------------+-----------------------------------------+
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| r3 | Volatile | (Parameter 1, and return value.) |
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+--------------+--------------------+-----------------------------------------+
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| r4-r8 | Volatile | (Parameters 2-6.) |
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+--------------+--------------------+-----------------------------------------+
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All floating point and vector data registers as well as control and status
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registers are nonvolatile.
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