[v6,01/20] arm64: ilp32: add documentation on the ILP32 ABI for ARM64

Commit Message

Yury Norov Dec. 15, 2015, 9:42 p.m. UTC

Based on Andrew Pinski's patch-series.

Signed-off-by: Yury Norov <[e-mail]>
---
 Documentation/arm64/ilp32.txt | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)
 create mode 100644 Documentation/arm64/ilp32.txt

Patch

diff --git a/Documentation/arm64/ilp32.txt b/Documentation/arm64/ilp32.txt
new file mode 100644
index 0000000..ad3a48e
--- /dev/null
+++ b/Documentation/arm64/ilp32.txt
@@ -0,0 +1,17 @@ 
+ILP32 AARCH64 SYSCALL ABI
+=========================
+
+This document describes the ILP32 syscall ABI and where it differs
+from the generic compat linux syscall interface.
+
+Syscalls which normally would pass 64bit values as two arguments;
+now pass the 64bit value as one argument.
+
+struct rt_sigframe is redefined and contains struct compat_siginfo,
+as compat syscalls expects, and struct sigframe, taken from lp64 to
+handle AARCH64 register set.
+
+Syscalls openat and open_by_handle_at are as non-compat as, it's
+temporary solution. There is expected global refactoring for all
+platforms.
+