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