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# Blackfin testcase for returning to the right place while bouncing between
# multiple CEC levels (like in a Linux system call)
# mach: bfin
# sim: --environment operating
#include "test.h"
.include "testutils.inc"
# This test keeps P5 as the base of the EVT table
.macro set_evt lvl:req, sym:req
loadsym R1, \sym;
[P5 + 4 * \lvl\()] = R1;
.endm
start
# First mark all EVTs as fails (they shouldn't be activated)
imm32 P5, EVT0;
P1 = P5;
loadsym R1, fail_lvl
imm32 P2, 16
LSETUP (1f, 1f) LC0 = P2;
1: [P1++] = R1;
# The OS exception handler
set_evt 3, _evx;
# The OS system call handler
set_evt 15, _evt15;
# Lower ourselves to userspace
loadsym R1, _user;
loadsym R2, _next_user;
RETI = R1;
R7 = -1;
sti R7;
RTI;
_user:
EXCPT 0;
_next_user:
dbg_pass
_evx:
# RETX should be pointing to the right place
R1 = RETX;
CC = R1 == R2;
IF !CC JUMP fail_lvl;
# Lower ourselves to the system call handler
RAISE 15;
RTX;
_evt15:
# RETI should be pointing to the right place
R1 = RETI;
CC = R1 == R2;
IF !CC JUMP fail_lvl;
# Return to userspace now
RTI;
fail_lvl:
dbg_fail
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