--- trunk/reactos/boot/freeldr/bootsect/ofwboot.s 2006-01-31 19:04:20 UTC (rev 65)
+++ trunk/reactos/boot/freeldr/bootsect/ofwboot.s 2006-01-31 19:09:28 UTC (rev 66)
@@ -1,1242 +0,0 @@
- .section .text
-_start:
- .long 0xe00000 + 12
- .long 0
- .long 0
-
-/*
- * LIFTED FROM arch/macppc/stand/ofwboot/Locore.c
- * Copyright (C) 1995, 1996 Wolfgang Solfrank.
- * Copyright (C) 1995, 1996 TooLs GmbH.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by TooLs GmbH.
- * 4. The name of TooLs GmbH may not be used to endorse or promote products
- * derived from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
- * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES ; LOSS OF USE, DATA, OR PROFITS;
- * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
- * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
- * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
- * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-_begin:
- sync
- isync
-
- lis %r1,stack@ha
- addi %r1,%r1,stack@l
- addi %r1,%r1,16384 - 0x10
-
- mfmsr %r8
- li %r0,0
- mtmsr %r0
- isync
-
- mtibatu 0,%r0
- mtibatu 1,%r0
- mtibatu 2,%r0
- mtibatu 3,%r0
- mtdbatu 0,%r0
- mtdbatu 1,%r0
- mtdbatu 2,%r0
- mtdbatu 3,%r0
-
- li %r9,0x12 /* BATL(0, BAT_M, BAT_PP_RW) */
- mtibatl 0,%r9
- mtdbatl 0,%r9
- li %r10,0x1ffe /* BATU(0, BAT_BL_256M, BAT_Vs) */
- mtibatu 0,%r10
- mtdbatu 0,%r10
-
- isync
-
- li %r8,0x3030
- mtmsr %r8
-
- /* Store ofw call addr */
- mr %r21,%r5
- lis %r10,0xe00000@ha
- stw %r5,ofw_call_addr - _start@l(%r10)
-
- lis %r4,_binary_freeldr_tmp_end@ha
- addi %r4,%r4,_binary_freeldr_tmp_end@l
- lis %r3,_binary_freeldr_tmp_start@ha
- addi %r3,%r3,_binary_freeldr_tmp_start@l
-
- lis %r5,0x8000@ha
- addi %r5,%r5,0x8000@l
-
- bl copy_bits
-
- bl zero_registers
-
- lis %r3,0xe00000@ha
- addi %r3,%r3,freeldr_banner - _start
-
- bl ofw_print_string
-
- bl ofw_print_eol
-
- bl setup_exc
-
- /* Zero CTR */
- mtcr %r31
-
- lis %r3,0x8000@ha
- addi %r3,%r3,0x8000@l
-
- mtlr %r3
-
- lis %r3,call_ofw@ha
- addi %r3,%r3,call_ofw - _start
-
- b call_freeldr
-
- .align 4
-call_freeldr:
- /* Get the address of the functions list --
- * Note:
- * Because of little endian switch we must use an even number of
- * instructions here.. Pad with a nop if needed. */
- mfmsr %r10
- ori %r10,%r10,1
- mtmsr %r10
-
- nop
-
- /* Note that this is little-endian from here on */
- blr
- nop
-
- .align 4
-call_ofw:
- /* R3 has the function offset to call (n * 4)
- * Other arg registers are unchanged.
- * Note that these 4 instructions are in reverse order due to
- * little-endian convention */
- andi. %r0,%r0,65534
- mfmsr %r0
- mtmsr %r0
- /* Now normal ordering resumes */
- subi %r1,%r1,0x100
-
- stw %r8,4(%r1)
- stw %r9,8(%r1)
- stw %r10,12(%r1)
- mflr %r8
- stw %r8,16(%r1)
-
- lis %r10,0xe00000@ha
- add %r9,%r3,%r10
- lwz %r3,ofw_functions - _start@l(%r9)
- mtctr %r3
-
- mr %r3,%r4
- mr %r4,%r5
- mr %r5,%r6
- mr %r6,%r7
- mr %r7,%r8
-
- /* Goto the swapped function */
- bctrl
-
- lwz %r8,16(%r1)
- mtlr %r8
-
- lwz %r8,4(%r1)
- lwz %r9,8(%r1)
- lwz %r10,12(%r1)
-
- addi %r1,%r1,0x100
- /* Ok, go back to little endian */
- mfmsr %r0
- ori %r0,%r0,1
- mtmsr %r0
-
- /* Note that this is little-endian from here on */
- blr
- nop
-
-zero_registers:
- xor %r2,%r2,%r2
- mr %r0,%r2
- mr %r3,%r2
-
- mr %r4,%r2
- mr %r5,%r2
- mr %r6,%r2
- mr %r7,%r2
-
- mr %r8,%r2
- mr %r9,%r2
- mr %r10,%r2
- mr %r11,%r2
-
- mr %r12,%r2
- mr %r13,%r2
- mr %r14,%r2
- mr %r15,%r2
-
- mr %r12,%r2
- mr %r13,%r2
- mr %r14,%r2
- mr %r15,%r2
-
- mr %r16,%r2
- mr %r17,%r2
- mr %r18,%r2
- mr %r19,%r2
-
- mr %r20,%r2
- mr %r21,%r2
- mr %r22,%r2
- mr %r23,%r2
-
- mr %r24,%r2
- mr %r25,%r2
- mr %r26,%r2
- mr %r27,%r2
-
- mr %r28,%r2
- mr %r29,%r2
- mr %r30,%r2
- mr %r31,%r2
-
- blr
-
-prim_strlen:
- mr %r5,%r3
-prim_strlen_loop:
- lbz %r4,0(%r3)
- cmpi 0,0,%r4,0
- beq prim_strlen_done
- addi %r3,%r3,1
- b prim_strlen_loop
-
-prim_strlen_done:
- sub %r3,%r3,%r5
- blr
-
-copy_bits:
- cmp 0,0,%r3,%r4
- beqlr
- lwz %r6,0(%r3)
- stw %r6,0(%r5)
- addi %r3,%r3,4
- addi %r5,%r5,4
- b copy_bits
-
-ofw_print_string_hook:
- bl ofw_print_number
- bl ofw_exit
-
-ofw_print_string:
- /* Reserve some stack space */
- subi %r1,%r1,32
-
- /* Save args */
- stw %r3,0(%r1)
-
- /* Save the lr, a scratch register */
- stw %r8,8(%r1)
- mflr %r8
- stw %r8,12(%r1)
-
- /* Load the package name */
- lis %r3,0xe00000@ha
- addi %r3,%r3,ofw_chosen_name - _start
-
- /* Fire */
- bl ofw_finddevice
-
- /* Load up for getprop */
- stw %r3,16(%r1)
-
- lis %r4,0xe00000@ha
- addi %r4,%r4,ofw_stdout_name - _start
-
- addi %r5,%r1,20
-
- li %r6,4
-
- bl ofw_getprop
-
- /* Measure the string and remember the length */
- lwz %r3,0(%r1)
- bl prim_strlen
- mr %r5,%r3
-
- lwz %r3,20(%r1)
- lwz %r4,0(%r1)
-
- /* Write the string */
- bl ofw_write
-
- /* Return */
- lwz %r8,12(%r1)
- mtlr %r8
- lwz %r8,8(%r1)
-
- addi %r1,%r1,32
- blr
-
- /* Print 8 hex digits representing a number in r3 */
-ofw_print_number:
- subi %r1,%r1,32
- stw %r8,0(%r1)
- mflr %r8
- stw %r8,4(%r1)
- stw %r9,8(%r1)
-
- xor %r9,%r9,%r9
- stw %r9,12(%r1)
-
- /* Set up and, devide, shift */
- mr %r8,%r3
- lis %r6,0xf0000000@ha
- lis %r7,0x10000000@ha
- li %r9,8
-
-ofw_number_loop:
- nop
- cmpi 0,0,%r9,0
- beq ofw_number_return
- subi %r9,%r9,1
-
- /* Body: isolate digit, divide, print */
- and %r5,%r6,%r8
- divwu %r4,%r5,%r7
- srwi %r6,%r6,4
- srwi %r7,%r7,4
-
- nop
-
- cmpi 0,0,%r4,10
- bge ofw_number_letter
- addi %r4,%r4,'0'
- b ofw_number_digit_out
-
-ofw_number_letter:
- addi %r4,%r4,'A' - 10
-
-ofw_number_digit_out:
- stb %r4,12(%r1)
- addi %r3,%r1,12
-
- stw %r6,16(%r1)
- stw %r7,20(%r1)
- stw %r8,24(%r1)
- stw %r9,28(%r1)
-
- bl ofw_print_string
-
- lwz %r6,16(%r1)
- lwz %r7,20(%r1)
- lwz %r8,24(%r1)
- lwz %r9,28(%r1)
-
- b ofw_number_loop
-
-ofw_number_return:
- /* Return */
- lwz %r9,8(%r1)
- lwz %r8,4(%r1)
- mtlr %r8
- lwz %r8,0(%r1)
- addi %r1,%r1,32
- blr
-
-ofw_print_eol:
- subi %r1,%r1,16
- stw %r8,0(%r1)
- mflr %r8
- stw %r8,4(%r1)
- li %r4,0x0d0a
- sth %r4,8(%r1)
- xor %r4,%r4,%r4
- sth %r4,10(%r1)
- addi %r3,%r1,8
- bl ofw_print_string
- lwz %r8,4(%r1)
- mtlr %r8
- lwz %r8,0(%r1)
- addi %r1,%r1,16
- blr
-
-ofw_print_nothing:
- subi %r1,%r1,16
- stw %r8,0(%r1)
- mflr %r8
- stw %r8,4(%r1)
- li %r4,0
- sth %r4,8(%r1)
- xor %r4,%r4,%r4
- sth %r4,10(%r1)
- addi %r3,%r1,8
- bl ofw_print_string
- lwz %r8,4(%r1)
- mtlr %r8
- lwz %r8,0(%r1)
- addi %r1,%r1,16
- blr
-
-ofw_print_space:
- subi %r1,%r1,16
- stw %r8,0(%r1)
- mflr %r8
- stw %r8,4(%r1)
- li %r4,0x2000
- sth %r4,8(%r1)
- xor %r4,%r4,%r4
- sth %r4,10(%r1)
- addi %r3,%r1,8
- bl ofw_print_string
- lwz %r8,4(%r1)
- mtlr %r8
- lwz %r8,0(%r1)
- addi %r1,%r1,16
- blr
-
-ofw_print_regs:
- /* Construct ofw exit call */
- subi %r1,%r1,0xa0
-
- stw %r0,0(%r1)
- stw %r1,4(%r1)
- stw %r2,8(%r1)
- stw %r3,12(%r1)
-
- stw %r4,16(%r1)
- stw %r5,20(%r1)
- stw %r6,24(%r1)
- stw %r7,28(%r1)
-
- stw %r8,32(%r1)
- stw %r9,36(%r1)
- stw %r10,40(%r1)
- stw %r11,44(%r1)
-
- stw %r12,48(%r1)
- stw %r13,52(%r1)
- stw %r14,56(%r1)
- stw %r15,60(%r1)
-
- stw %r16,64(%r1)
- stw %r17,68(%r1)
- stw %r18,72(%r1)
- stw %r19,76(%r1)
-
- stw %r20,80(%r1)
- stw %r21,84(%r1)
- stw %r22,88(%r1)
- stw %r23,92(%r1)
-
- stw %r24,96(%r1)
- stw %r25,100(%r1)
- stw %r26,104(%r1)
- stw %r27,108(%r1)
-
- stw %r28,112(%r1)
- stw %r29,116(%r1)
- stw %r30,120(%r1)
- stw %r31,124(%r1)
-
- mflr %r0
- stw %r0,128(%r1)
- mfcr %r0
- stw %r0,132(%r1)
- mfctr %r0
- stw %r0,136(%r1)
- mfmsr %r0
- stw %r0,140(%r1)
-
- /* Count at zero */
- xor %r0,%r0,%r0
- stw %r0,144(%r1)
- mr %r3,%r1
- stw %r3,148(%r1)
-
- /* Body, print the regname, then the register */
-ofw_register_loop:
- lwz %r3,144(%r1)
- cmpi 0,0,%r3,32
- beq ofw_register_special
- lis %r3,0xe00000@ha
- addi %r3,%r3,freeldr_reg_init - _start
- bl ofw_print_string
- lwz %r3,144(%r1)
- bl ofw_print_number
- bl ofw_print_space
- lwz %r3,144(%r1)
- mulli %r3,%r3,4
- add %r3,%r1,%r3
- lwz %r3,0(%r3)
- stw %r3,152(%r1)
- bl ofw_print_number
- lwz %r3,144(%r1)
- addi %r3,%r3,1
- stw %r3,144(%r1)
- b done_dump
-
-dump_optional:
- bl ofw_print_space
- bl ofw_print_space
- lwz %r3,152(%r1)
- lwz %r3,0(%r3)
- bl ofw_print_number
- bl ofw_print_space
- lwz %r3,152(%r1)
- lwz %r3,4(%r3)
- bl ofw_print_number
- bl ofw_print_space
- lwz %r3,152(%r1)
- lwz %r3,8(%r3)
- bl ofw_print_number
- bl ofw_print_space
- lwz %r3,152(%r1)
- lwz %r3,12(%r3)
- bl ofw_print_number
- bl ofw_print_space
-done_dump:
- bl ofw_print_eol
- b ofw_register_loop
-
-ofw_register_special:
- /* LR */
- lis %r3,0xe00000@ha
- addi %r3,%r3,freeldr_reg_lr - _start
- bl ofw_print_string
- bl ofw_print_space
- lwz %r3,128(%r1)
- bl ofw_print_number
- bl ofw_print_eol
-
- /* CR */
- lis %r3,0xe00000@ha
- addi %r3,%r3,freeldr_reg_cr - _start
- bl ofw_print_string
- bl ofw_print_space
- lwz %r3,132(%r1)
- bl ofw_print_number
- bl ofw_print_eol
-
- /* CTR */
- lis %r3,0xe00000@ha
- addi %r3,%r3,freeldr_reg_ctr - _start
- bl ofw_print_string
- bl ofw_print_space
- lwz %r3,136(%r1)
- bl ofw_print_number
- bl ofw_print_eol
-
- /* MSR */
- lis %r3,0xe00000@ha
- addi %r3,%r3,freeldr_reg_msr - _start
- bl ofw_print_string
- bl ofw_print_space
- lwz %r3,140(%r1)
- bl ofw_print_number
- bl ofw_print_eol
-
- /* Return */
- lwz %r0,128(%r1)
- mtlr %r0
-
- lwz %r0,0(%r1)
- lwz %r2,8(%r1)
- lwz %r3,12(%r1)
-
- lwz %r4,16(%r1)
- lwz %r5,20(%r1)
- lwz %r6,24(%r1)
- lwz %r7,28(%r1)
-
- addi %r1,%r1,0xa0
-
- blr
-
-ofw_finddevice_hook:
- subi %r1,%r1,32
- stw %r3,0(%r1)
- mflr %r3
- stw %r3,4(%r1)
- lwz %r3,0(%r1)
- bl ofw_finddevice
- stw %r3,0(%r1)
- lwz %r3,4(%r1)
- mtlr %r3
- lwz %r3,0(%r1)
- addi %r1,%r1,32
- blr
-
-ofw_finddevice:
- /* Reserve stack space ...
- * 20 bytes for the ofw call,
- * r8, r9, and lr */
- subi %r1,%r1,32
-
- /* Store r8, r9, lr */
- stw %r8,20(%r1)
- stw %r9,24(%r1)
- mflr %r8
- stw %r8,28(%r1)
-
- /* Get finddevice name */
- lis %r8,0xe00000@ha
- addi %r9,%r8,ofw_finddevice_name - _start
- stw %r9,0(%r1)
-
- /* 1 Argument and 1 return */
- li %r9,1
- stw %r9,4(%r1)
- stw %r9,8(%r1)
-
- stw %r3,12(%r1)
-
- /* Load up the call address */
- lwz %r9,ofw_call_addr - _start(%r8)
- mtlr %r9
-
- /* Set argument */
- mr %r3,%r1
-
- /* Fire */
- blrl
-
- lwz %r3,16(%r1)
-
- /* Restore registers */
- lwz %r8,28(%r1)
- mtlr %r8
- lwz %r9,24(%r1)
- lwz %r8,20(%r1)
-
- addi %r1,%r1,32
-
- /* Return */
- blr
-
-ofw_open:
- /* Reserve stack space ...
- * 20 bytes for the ofw call,
- * r8, r9, and lr */
- subi %r1,%r1,32
-
- /* Store r8, r9, lr */
- stw %r8,20(%r1)
- stw %r9,24(%r1)
- mflr %r8
- stw %r8,28(%r1)
-
- /* Get open name */
- lis %r8,0xe00000@ha
- addi %r9,%r8,ofw_open_name - _start
- stw %r9,0(%r1)
-
- /* 1 Argument and 1 return */
- li %r9,1
- stw %r9,4(%r1)
- stw %r9,8(%r1)
-
- stw %r3,12(%r1)
-
- /* Load up the call address */
- lwz %r9,ofw_call_addr - _start(%r8)
- mtlr %r9
-
- /* Set argument */
- mr %r3,%r1
-
- /* Fire */
- blrl
-
- lwz %r3,16(%r1)
-
- /* Restore registers */
- lwz %r8,28(%r1)
- mtlr %r8
- lwz %r9,24(%r1)
- lwz %r8,20(%r1)
-
- addi %r1,%r1,32
-
- /* Return */
- blr
-
-ofw_getprop_hook:
- /* Reserve stack space:
- * 32 bytes for the ofw call
- * 12 bytes for r8, r9, lr
- */
- /* Reserve stack space ...
- * 20 bytes for the ofw call,
- * r8, r9, and lr */
- subi %r1,%r1,48
-
- /* Store r8, r9, lr */
- stw %r8,32(%r1)
- stw %r9,36(%r1)
- mflr %r8
- stw %r8,40(%r1)
-
- /* Get getprop name */
- lis %r8,0xe00000@ha
- addi %r9,%r8,ofw_getprop_name - _start
- stw %r9,0(%r1)
-
- /* 4 Argument and 1 return */
- li %r9,4
- stw %r9,4(%r1)
- li %r9,1
- stw %r9,8(%r1)
-
- stw %r3,12(%r1) /* Package */
- stw %r4,16(%r1) /* Property */
- stw %r5,20(%r1) /* Return buffer */
- stw %r6,24(%r1) /* Buffer size */
-
- /* Load up the call address */
- lwz %r9,ofw_call_addr - _start(%r8)
- mtlr %r9
-
- /* Set argument */
- mr %r3,%r1
-
- /* Fire */
- blrl
-
- /* Workaround to a wierd crash ... not sure what causes it.
- * XXX investigate me */
- bl ofw_print_nothing
-
- /* Return */
- lwz %r3,28(%r1)
-
- /* Restore registers */
- lwz %r8,40(%r1)
- mtlr %r8
- lwz %r9,36(%r1)
- lwz %r8,32(%r1)
-
- addi %r1,%r1,48
-
- /* Return */
- blr
-
-ofw_getprop:
- /* Reserve stack space:
- * 32 bytes for the ofw call
- * 12 bytes for r8, r9, lr
- */
- /* Reserve stack space ...
- * 20 bytes for the ofw call,
- * r8, r9, and lr */
- subi %r1,%r1,48
-
- /* Store r8, r9, lr */
- stw %r8,32(%r1)
- stw %r9,36(%r1)
- mflr %r8
- stw %r8,40(%r1)
-
- /* Get getprop name */
- lis %r8,0xe00000@ha
- addi %r9,%r8,ofw_getprop_name - _start
- stw %r9,0(%r1)
-
- /* 4 Argument and 1 return */
- li %r9,4
- stw %r9,4(%r1)
- li %r9,1
- stw %r9,8(%r1)
-
- stw %r3,12(%r1) /* Package */
- stw %r4,16(%r1) /* Property */
- stw %r5,20(%r1) /* Return buffer */
- stw %r6,24(%r1) /* Buffer size */
-
- /* Load up the call address */
- lwz %r9,ofw_call_addr - _start(%r8)
- mtlr %r9
-
- /* Set argument */
- mr %r3,%r1
-
- /* Fire */
- blrl
-
- /* Return */
- lwz %r3,28(%r1)
-
- /* Restore registers */
- lwz %r8,40(%r1)
-
- mtlr %r8
- lwz %r9,36(%r1)
- lwz %r8,32(%r1)
-
- addi %r1,%r1,48
-
- /* Return */
- blr
-
-ofw_write:
- /* Reserve stack space:
- * 28 bytes for the ofw call
- * 12 bytes for r8, r9, lr
- */
- /* Reserve stack space ...
- * 20 bytes for the ofw call,
- * r8, r9, and lr */
- subi %r1,%r1,48
-
- nop
-
- /* Store r8, r9, lr */
- stw %r8,28(%r1)
- stw %r9,32(%r1)
- mflr %r8
- stw %r8,36(%r1)
-
- /* Get write name */
- lis %r8,0xe00000@ha
- addi %r9,%r8,ofw_write_name - _start
- stw %r9,0(%r1)
-
- /* 3 Arguments and 1 return */
- li %r9,3
- stw %r9,4(%r1)
- li %r9,1
- stw %r9,8(%r1)
-
- stw %r3,12(%r1)
- stw %r4,16(%r1)
- stw %r5,20(%r1)
-
- /* Load up the call address */
- lwz %r9,ofw_call_addr - _start(%r8)
- mtlr %r9
-
- /* Set argument */
- mr %r3,%r1
-
- /* Fire */
- blrl
-
- /* Return */
- lwz %r3,24(%r1)
-
- /* Restore registers */
- lwz %r8,36(%r1)
- mtlr %r8
- lwz %r9,32(%r1)
- lwz %r8,28(%r1)
-
- addi %r1,%r1,48
-
- /* Return */
- blr
-
-ofw_read:
- /* Reserve stack space:
- * 28 bytes for the ofw call
- * 12 bytes for r8, r9, lr
- */
- /* Reserve stack space ...
- * 20 bytes for the ofw call,
- * r8, r9, and lr */
- subi %r1,%r1,48
-
- nop
-
- /* Store r8, r9, lr */
- stw %r8,28(%r1)
- stw %r9,32(%r1)
- mflr %r8
- stw %r8,36(%r1)
-
- /* Get read name */
- lis %r8,0xe00000@ha
- addi %r9,%r8,ofw_read_name - _start
- stw %r9,0(%r1)
-
- /* 3 Arguments and 1 return */
- li %r9,3
- stw %r9,4(%r1)
- li %r9,1
- stw %r9,8(%r1)
-
- stw %r3,12(%r1)
- stw %r4,16(%r1)
- stw %r5,20(%r1)
-
- /* Load up the call address */
- lwz %r9,ofw_call_addr - _start(%r8)
- mtlr %r9
-
- /* Set argument */
- mr %r3,%r1
-
- /* Fire */
- blrl
-
- /* Return */
- lwz %r3,24(%r1)
-
- /* Restore registers */
- lwz %r8,36(%r1)
- mtlr %r8
- lwz %r9,32(%r1)
- lwz %r8,28(%r1)
-
- addi %r1,%r1,48
-
- /* Return */
- blr
-
-ofw_exit:
- lis %r3,0xe00000@ha
- addi %r3,%r3,freeldr_halt - _start
-
- bl ofw_print_string
-/*
-ofw_exit_loop:
- b ofw_exit_loop
-*/
- /* Load the exit name */
- lis %r8,0xe00000@ha
- addi %r9,%r8,ofw_exit_name - _start
- stw %r9,0(%r1)
-
- /* Zero args, zero returns */
- xor %r9,%r9,%r9
- stw %r9,4(%r1)
- stw %r9,8(%r1)
-
- /* Load up the call address */
- lwz %r9,ofw_call_addr - _start(%r8)
- mtlr %r9
-
- mr %r3,%r1
-
- /* Fire */
- blrl
- /* No return from exit */
-
-ofw_child:
- /* Reserve stack space ...
- * 20 bytes for the ofw call,
- * r8, r9, and lr */
- subi %r1,%r1,32
-
- /* Store r8, r9, lr */
- stw %r8,20(%r1)
- stw %r9,24(%r1)
- mflr %r8
- stw %r8,28(%r1)
-
- /* Get child name */
- lis %r8,0xe00000@ha
- addi %r9,%r8,ofw_child_name - _start
- stw %r9,0(%r1)
-
- /* 1 Argument and 1 return */
- li %r9,1
- stw %r9,4(%r1)
- stw %r9,8(%r1)
-
- stw %r3,12(%r1)
-
- /* Load up the call address */
- lwz %r9,ofw_call_addr - _start(%r8)
- mtlr %r9
-
- /* Set argument */
- mr %r3,%r1
-
- /* Fire */
- blrl
-
- lwz %r3,16(%r1)
-
- /* Restore registers */
- lwz %r8,28(%r1)
- mtlr %r8
- lwz %r9,24(%r1)
- lwz %r8,20(%r1)
-
- addi %r1,%r1,32
-
- /* Return */
- blr
-
-ofw_peer:
- /* Reserve stack space ...
- * 20 bytes for the ofw call,
- * r8, r9, and lr */
- subi %r1,%r1,32
-
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