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Diffstat (limited to 'sim/doc/arch-aarch64.texi')
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diff --git a/sim/doc/arch-aarch64.texi b/sim/doc/arch-aarch64.texi new file mode 100644 index 00000000000..bbf6cd983c6 --- /dev/null +++ b/sim/doc/arch-aarch64.texi @@ -0,0 +1,28 @@ +@node AArch64 +@chapter AArch64 +Arm Ltd's 64-bit ARM64 RISC architecture. + +@node AArch64 Environment Support +@section Environment Support +Only the virtual environment is supported. + +@node AArch64 Virtual Environment Syscall ABI +@subsection Virtual Environment Syscall ABI +The syscall ABI, as used by the RDI (Angel) monitor and @value{libgloss} in the +virtual environment, uses the interface defined in the following table. + +@multitable @columnfractions .2 .3 .5 +@headitem Field @tab Assembly/Register @tab Description +@item instruction +@tab @center @code{hlt #0xf000;} +@tab The assembly instruction to invoke the syscall handler. +@item (in) syscall NR +@tab @center @code{w0} +@tab The system call number to select which function to run. +@item (in) parameters +@tab @center @code{x1} +@tab Pointer to the syscall argument array (64-bit elements). +@item (out) return & error +@tab @center @code{x0} +@tab The return value (most commonly used). +@end multitable |