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root/cebix/SheepShaver/src/Unix/ppc_asm.S
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Comparing SheepShaver/src/Unix/ppc_asm.S (file contents):
Revision 1.5 by gbeauche, 2005-06-25T06:33:39Z vs.
Revision 1.8 by gbeauche, 2005-06-28T16:50:30Z

# Line 180 | Line 180 | C_SYMBOL_NAME(test_and_set):
180          isync
181          lwarx   r5,0,r3
182          cmpi    0,r5,0x0000
183 <        beq     1f
183 >        bne     1f
184          stwcx.  r4,0,r3
185          bne-    0b
186   1:      isync    
# Line 245 | Line 245 | C_SYMBOL_NAME(jump_to_rom):
245          // Restore PowerPC registers
246          lwz     r1,XLM_EMUL_RETURN_STACK(0)
247          RESTORE_SYSTEM_R2
248 –        RESTORE_SYSTEM_R13
248          lmw     r13,20(r1)
249          lfd     f14,20+19*4+0*8(r1)
250          lfd     f15,20+19*4+1*8(r1)
# Line 811 | Line 810 | C_SYMBOL_NAME(ppc_interrupt):
810          // Enter nanokernel
811          mtlr    r3
812          blr
813 +
814 +
815 + /*
816 + *  Define signal handlers with alternate stack initialization magic
817 + */
818 +
819 + #define SIG_STACK_SIZE 0x10000
820 +
821 + ASM_MACRO_START do_define_signal_handler        \
822 +        ASM_MACRO_ARG0_DEF /* name */           \
823 +        ASM_MACRO_ARG1_DEF /* stack */          \
824 +        ASM_MACRO_ARG2_DEF /* stack id */       \
825 +        ASM_MACRO_ARG3_DEF /* signal handler */
826 +
827 +        // Alternate stack lower base for this signal handler
828 +        .lcomm ASM_MACRO_ARG1,SIG_STACK_SIZE,ASM_ALIGN_2(4)
829 +        ASM_TYPE(ASM_MACRO_ARG1,@object)
830 +
831 +        // Represents the current nest level for this signal handler
832 +        // Note that in SheepShaver, SIGUSR2 signals are blocked while
833 +        // handling other signals so, it's unlikely we ever get a nest
834 +        // level greater than 1
835 +        .lcomm ASM_MACRO_ARG2,4,ASM_ALIGN_2(2)
836 +        ASM_TYPE(ASM_MACRO_ARG2,@object)
837 +
838 +        ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(ASM_MACRO_ARG0)
839 + C_SYMBOL_NAME(ASM_MACRO_ARG0):
840 +        // Preserve args in scratch registers
841 +        mflr    r14
842 +        mr      r15,r3
843 +        mr      r16,r4
844 +        mr      r17,r5
845 +        mr      r18,r1
846 +
847 +        // Atomically increase stack_id
848 +        lis     r19,ASM_HA16(ASM_MACRO_ARG2)
849 +        la      r19,ASM_LO16(ASM_MACRO_ARG2,r19)
850 +        li      r4,1
851 +        mr      r3,r19
852 +        bl      C_SYMBOL_NAME(atomic_add)
853 +        cmpwi   r3,0
854 +        bne-    1f
855 +
856 +        // ID was 0, we can use the local stack
857 +        lis     r9,ASM_HA16(ASM_MACRO_ARG1)
858 +        lis     r3,(SIG_STACK_SIZE>>16)
859 +        la      r9,ASM_LO16(ASM_MACRO_ARG1,r9)
860 +        addi    r3,r3,((SIG_STACK_SIZE&0xffff)-64)
861 +        add     r1,r9,r3
862 +
863 + 1:      // Invoke signal handler
864 +        stwu    r1,-16(r1)
865 +        mr      r3,r15
866 +        mr      r4,r16
867 +        mr      r5,r17
868 +        bl      C_SYMBOL_NAME(ASM_MACRO_ARG3)
869 +        addi    r1,r1,16
870 +
871 +        // Atomically decrease stack id
872 +        mr      r3,r19
873 +        li      r4,-1
874 +        bl      C_SYMBOL_NAME(atomic_add)
875 +
876 +        // Restore kernel stack and return
877 +        mtlr    r14
878 +        mr      r1,r18
879 +        blr
880 + ASM_MACRO_END
881 +
882 + #define DEFINE_SIGNAL_HANDLER(NAME)               \
883 +        do_define_signal_handler                  \
884 +        NAME##_handler_init     ASM_MACRO_ARG_SEP \
885 +        NAME##_stack            ASM_MACRO_ARG_SEP \
886 +        NAME##_stack_id         ASM_MACRO_ARG_SEP \
887 +        NAME##_handler
888 +
889 + DEFINE_SIGNAL_HANDLER(sigusr2)

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