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Add E_FLAGS for the Atomic ABIs #383

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Add E_FLAGS for the Atomic ABIs #383

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15 changes: 12 additions & 3 deletions riscv-elf.adoc
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Original file line number Diff line number Diff line change
Expand Up @@ -193,9 +193,9 @@ below.
[cols="1,2,1,1,3,5"]
[width=80%]
|===
| Bit 0 | Bits 1 - 2 | Bit 3 | Bit 4 | Bits 5 - 23 | Bits 24 - 31
| Bit 0 | Bits 1 - 2 | Bit 3 | Bit 4 | Bits 5 - 6 | Bits 7 - 23 | Bits 24 - 31

| RVC | Float ABI | RVE | TSO | *Reserved* | *Non-standard extensions*
| RVC | Float ABI | RVE | TSO | Atomic ABI | *Reserved* | *Non-standard extensions*
|===

+
Expand Down Expand Up @@ -233,7 +233,13 @@ below.
EF_RISCV_TSO (0x0010)::: This bit is set when the binary requires the RVTSO
memory consistency model.

Until such a time that the *Reserved* bits (0x00ffffe0) are allocated by future
EF_RISCV_ATOMIC_A6 (0x0020)::: This bit is set when the binary is compatible
with the A.6 atomic mappings.

EF_RISCV_ATOMIC_A7 (0x0040)::: This bit is set when the binary is compatible
with the A.6 atomic mappings.
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"I wrote this before having coffee." => I think you need to change A.6 to A.7 here :)

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Looks like it's been NAK'd, so whatever ;)


Until such a time that the *Reserved* bits (0x00ffff70) are allocated by future
versions of this specification, they shall not be set by standard software.
Non-standard extensions are free to use bits 24-31 for any purpose. This may
conflict with other non-standard extensions.
Expand Down Expand Up @@ -268,6 +274,9 @@ raise an error.
TSO::: Linker should report errors if object files of different value
for TSO field.

Atomic ABI:::Linker should report errors if incompatible object files are
linked.

NOTE: The static linker may ignore the compatibility checks if all fields in the
`e_flags` are zero and all sections in the input file are non-executable
sections.
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