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jeremybenn |
/*
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Copyright (c) 2007, Toshiba Corporation
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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* Neither the names of Toshiba nor the names of its
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contributors may be used to endorse or promote products derived from this
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software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* This file contains code use to construct a PIC, spu side, syscall
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* function with variable parameters in accordance with the CBE ABI.
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*
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* This function is equivalent to constructing a va_list structure and
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* calling the va_list form of the function. Therefore, for example,
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* a printf function stack frame will look like this:
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*
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* | Stack | high memory
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* | Parms |
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* | |
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* |------------|
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* | Link Reg |
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* |------------|
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* | Back Chain |<-----. <---- input SP
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* |------------| |
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* | Reg 74 | |
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* |------------| |
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* | Reg 73 | |
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* |------------| |
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* // ... // |
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* |------------| |
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* | Reg 5 | |
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* |------------| |
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* | Reg 4 |<--. |
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* |------------| | |
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* va_list.| call_stack |------'
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* |------------| |
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* va_list.| next_arg |---'
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* |------------|
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* | format (r3)| <---- start of parameters
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* |------------| |------------|
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* | stack | | |
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* | code | |(Back Chain)| <---- output SP
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* | 1-3 qwords | <---- code_ptr `------------'
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* `------------'
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* low memory
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*
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* This was written in assembly so that it is smaller than what would
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* be produced by using va_start.
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*/
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#include "c99ppe.h"
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#define parms $2 /* Number of fixed arguments */
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#define offset $67
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#define flag $68
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#define regdec $69
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#define link $70
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#define code_ptr $71
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#define ptr $72
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#define inst $73
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#define tmp $74
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.text
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.global __stack_reg_va
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.type __stack_reg_va, @function
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__stack_reg_va:
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/* Save registers 69-74 explicitly so that we have some
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* working registers.
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*/
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stqd $74, 16*(-1)($sp)
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stqd $73, 16*(-2)($sp)
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stqd $72, 16*(-3)($sp)
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stqd $71, 16*(-4)($sp)
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stqd $70, 16*(-5)($sp)
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stqd $69, 16*(-6)($sp)
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/* Construct self-modifying stack code that saves the remaining
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* volatile registers onto the stack.
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*/
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il regdec, -1 /* for decrement register value in save instruction */
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shlqbyi regdec, regdec, 12
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il tmp, -(SPE_STACK_REGS+2+3)*16
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a code_ptr, $sp, tmp
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lqr tmp, save_regs_1 /* store stack code */
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stqd tmp, 0(code_ptr)
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lqr inst, save_regs_2
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ai ptr, $sp, 16*(-6)
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sync
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bisl link, code_ptr /* branch to the constructed stack code */
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/* Adjust pointer so that it points to the first variable
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* argument on the stack.
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*/
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ai offset, parms, -1 /* offset = parms - 1 */
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mpyi offset, offset, 16 /* offset = offset * 16 */
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a ptr, ptr, offset /* ptr = ptr + offset */
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/* Store the va_list to the parameter list.
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*/
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stqd $sp, 16*(-1)(ptr)
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stqd ptr, 16*(-2)(ptr)
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/* Make $3 store address.
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*/
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ai offset, parms, 2 /* offset = parms + 2 */
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mpyi offset, offset, -16 /* offset = offset * -16 */
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a ptr, ptr, offset /* ptr = ptr + offset */
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/* Save all the fixed (non-variable arguments on the stack)
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*/
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ceqi flag, parms, 0x01 /* if(parms==1) flag=0xFFFFFFFF */
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brnz flag, reg_3 /* if(flag!=0) jump */
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ceqi flag, parms, 0x02 /* if(parms==2) flag=0xFFFFFFFF */
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brnz flag, reg_4 /* if(flag!=0) jump */
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stqd $5, 16*2(ptr)
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reg_4:
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stqd $4, 16*1(ptr)
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reg_3:
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stqd $3, 0(ptr)
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il $3, -16*(SPE_STACK_REGS+2+2)
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stqx $sp, $3, $sp /* save back chain */
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a $sp, $sp, $3
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bi $0 /* return to caller */
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/***************************** stack code *********************************************/
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/* The following code is copied into the stack for re-entract,
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* self-modified, code execution. This code copies the volatile
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* registers into a va_list parameter array.
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*/
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.balignl 16, 0
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save_regs_1:
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stqd inst, 16(code_ptr) /* store instruction */
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sync
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a inst, inst, regdec /* decrement register number in the instruction */
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ceqbi tmp, inst, 3 /* if (reg-num == 3) tmp = 0x000000FF 000..0 */
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save_regs_2:
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stqd $68, -16(ptr)
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ai ptr, ptr, -16
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brz tmp, save_regs_1 /* if (tmp == 0) jump */
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bi link /* finish to make va_list */
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.size __stack_reg_va, .-__stack_reg_va
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