Passing Parameters on the Stack (Example 10.5): m=r7, n=r4, p=r5 SRAM_BASE EQU Ox40000000 AREA PassbyStack, CODE, READONLY ENTRY LDR Sp, =SRAM_BASE MOV r1, #0x40000000 MOV r2, #2 STMIA sp!, {r1, r2} ; push parameters onto stack BL saturate LDMDBSP!, {r1, r2} ; pop results off stack ; Performs r4 = saturate32 (r5 << r7) STMIA sp!, {r3-r7, k} ; LR on stack for reentrancy LDR r5, {sp, #-0x20} LDR 17, {sp, #-Ox1C} SATURATE ALGORITHM STR r4, [sp, #-0x20] LDMDBsp!, {r3-r7, pc} END saturate ; get 1* parameter off stack ; get 2nd parameter off stack ; move result to bottom of stack ; return

Passing Parameters on the Stack (Example 10.5): m=r7, n=r4, p=r5 SRAM_BASE EQU Ox40000000 AREA PassbyStack, CODE, READONLY ENTRY LDR Sp, =SRAM_BASE MOV r1, #0x40000000 MOV r2, #2 STMIA sp!, {r1, r2} ; push parameters onto stack BL saturate LDMDBSP!, {r1, r2} ; pop results off stack ; Performs r4 = saturate32 (r5 << r7) STMIA sp!, {r3-r7, k} ; LR on stack for reentrancy LDR r5, {sp, #-0x20} LDR 17, {sp, #-Ox1C} SATURATE ALGORITHM STR r4, [sp, #-0x20] LDMDBsp!, {r3-r7, pc} END saturate ; get 1* parameter off stack ; get 2nd parameter off stack ; move result to bottom of stack ; return

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

Rewrite Example 10.5 (Passing on Stack) using full descending stacks.

Passing Parameters on the Stack (Example 10.5): m=r7, n=r4, p=r5
SRAM_BASE EQU Ox40000000
AREA PassbyStack, CODE, READONLY
ENTRY
LDR Sp, =SRAM_BASE
MOV r1, #0x40000000
MOV r2, #2
STMIA sp!, {r1, r2} ; push parameters onto stack
BL
saturate
LDMDBSP!, {r1, r2} ; pop results off stack
; Performs r4 = saturate32 (r5 << r7)
STMIA sp!, {r3-r7, k} ; LR on stack for reentrancy
LDR r5, {sp, #-0x20}
LDR 17, {sp, #-Ox1C}
SATURATE ALGORITHM
STR r4, [sp, #-0x20]
LDMDBsp!, {r3-r7, pc}
END
saturate
; get 1* parameter off stack
; get 2nd parameter off stack
; move result to bottom of stack
; return

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