github.com/mikpe.pdp10-tools
1
0
Fork 0
mirror of https://github.com/mikpe/pdp10-tools.git synced 2026-01-27 12:42:22 +00:00
Code Issues Projects Releases Wiki Activity

sim: sim_kernel: add FIXME about improved syscall return convention

Browse Source
This commit is contained in:
Mikael Pettersson
2020-07-10 21:51:17 +02:00
parent a1eac8e351
commit 81b46c4781
1 changed files with 4 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
erlang/apps/sim/src/sim_kernel.erl
View File

@@ -37,6 +37,10 @@
%% bits of EA, and the parameters in AC1 to AC7.
%% A successful call clears the Overflow flag and returns a value in AC1.
%% A failed call sets the Overflow flag and returns an error code in AC1.
%% [FIXME: Change to return success as 0 in AC0 and a value in AC1, and failure
%% as a non-zero errno in AC0 and -1 in AC1. A more common approach on Linux
%% is to signal failure by returning -errno, detectable by being >= -4095U, but
%% implementing that comparison on the PDP10 is fairly expensive.]
%% System call numbers are from Linux' <asm-generic/unistd.h>, and error codes
%% are from Linux' <asm-generic/errno.h>.