26de4c1ab1
The new test rck_e.e segfaults on PowerPC unless I make some changes. The inline code for _rck_ was wrong because it didn't allow the trap handler to return. _sig_ forgot to push the old trap handler. Move plat/linuxppc/libsys/trap.s to mach/powerpc/libem/trp.s and rewrite it with simplified/extended mnemonics. Remove .trap alias for .trp procedure. Add a missing `mtspr lr, r0` so we can return from the trap handler. Call write() and _exit() so trp.s works with both linuxppc and osxppc. Before, Mac OS X was wrongly using the trap.s for Linux. In powerpc/libem, simplify .aar4; teach .csa and .csb to raise the trap if the default target is zero. C programs don't need these changes. You may relink your C programs with the changed .csa and .csb, but C code doesn't raise the trap. Modula-2 code can raise traps, so you may want to relink your Modula-2 programs with the changed libem, but you might keep your old .o files from Modula-2. You may need to recompile your Pascal programs (delete old .o files from Pascal) because the Pascal compiler might use _rck_.
33 lines
851 B
ArmAsm
33 lines
851 B
ArmAsm
.sect .text
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! this is not a subroutine, but just a
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! piece of code that computes the jump-
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! address and jumps to it.
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! traps if resulting address is zero
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!
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! Stack: ( value tableaddr -- )
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.define .csa
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.csa:
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lwz r3, 0(sp)
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lwz r4, 4(sp)
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addi sp, sp, 8
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lwz r5, 0(r3) ! r5 = default target
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lwz r6, 4(r3) ! fetch lower bound
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subf. r4, r6, r4 ! adjust value
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blt 1f ! jump to default if out of range
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lwz r6, 8(r3) ! fetch range
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cmplw r4, r6
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bgt 1f ! jump to default if out of range
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addi r3, r3, 12 ! skip header
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slwi r4, r4, 2 ! scale value (<<2)
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lwzx r5, r3, r4 ! r5 = new target
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1: mtspr ctr, r5
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mr. r5, r5 ! test it
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bnectr ! jump to target if non-zero
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b .trap_ecase ! otherwise trap
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