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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [newlib/] [libc/] [machine/] [rx/] [setjmp.S] - Blame information for rev 207

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Line No. Rev Author Line
1 207 jeremybenn 
# setjmp/longjmp for Renesas RX.
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#
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# The jmpbuf looks like this:
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#
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# Register      jmpbuf offset
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# R0            0x0
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# R1            0x4
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# R2            0x8
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# R3            0xc
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# R4            0x10
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# R5            0x14
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# R6            0x18
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# R7            0x1c
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# R8            0x20
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# R9            0x24
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# R10           0x28
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# R11           0x2c
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# R12           0x30
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# R13           0x34
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# R14           0x38
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# R15           0x3c
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# PC            0x40
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#
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# R1 contains the pointer to jmpbuf:
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#
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#       int R1 = setjmp (jmp_buf R1)
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#       void longjmp (jmp_buf R1, int R2)
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#
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# The ABI allows for R1-R5 to be clobbered by functions.  We must be
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# careful to always leave the stack in a usable state in case an
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# interrupt happens.
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        .text
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        .global _setjmp
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        .type   _setjmp, @function
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_setjmp:
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        mov.l   r0, [r1]        ; save all the general registers
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        mov.l   r1, 0x4[r1]     ; longjmp won't use this, but someone else might.
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        mov.l   r2, 0x8[r1]
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        mov.l   r3, 0xc[r1]
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        mov.l   r4, 0x10[r1]
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        mov.l   r5, 0x14[r1]
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        mov.l   r6, 0x18[r1]
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        mov.l   r7, 0x1c[r1]
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        mov.l   r8, 0x20[r1]
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        mov.l   r9, 0x24[r1]
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        mov.l   r10, 0x28[r1]
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        mov.l   r11, 0x2c[r1]
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        mov.l   r12, 0x30[r1]
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        mov.l   r13, 0x34[r1]
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        mov.l   r14, 0x38[r1]
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        mov.l   r15, 0x3c[r1]
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        mov.l   [r0], r2        ; get return address off the stack
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        mov.l   r2, 0x40[r1]    ; PC
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        mov     #0, r1          ; Return 0.
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        rts
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.Lend1:
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        .size   _setjmp, .Lend1 - _setjmp
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        .global _longjmp
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        .type   _longjmp, @function
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_longjmp:
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        tst     r2, r2          ; Set the Z flag if r2 is 0.
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        stz     #1, r2          ; If the Z flag was set put 1 into the return register.
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        mov     r2, 4[r1]       ; Put r2 (our return value) into the setjmp buffer as r1.
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        mov.l   [r1], r0        ; Restore the stack - there's a slot for PC
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        mov.l   0x40[r1], r2    ; Get the saved PC
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        mov.l   r2, [r0]        ; Overwrite the old return address
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        mov.l   0x3c[r1], r15
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        mov.l   0x38[r1], r14
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        mov.l   0x34[r1], r13
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        mov.l   0x30[r1], r12
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        mov.l   0x2c[r1], r11
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        mov.l   0x28[r1], r10
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        mov.l   0x24[r1], r9
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        mov.l   0x20[r1], r8
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        mov.l   0x1c[r1], r7
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        mov.l   0x18[r1], r6
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        mov.l   0x14[r1], r5
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        mov.l   0x10[r1], r4
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        mov.l   0xc[r1], r3
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        mov.l   0x8[r1], r2
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        mov.l   0x4[r1], r1     ; This sets up the new return value
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        rts
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.Lend2:
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        .size   _longjmp, .Lend2 - _longjmp

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