| Line 39... |
Line 39... |
*****************************************************************/
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*****************************************************************/
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// Test "Strange issue with r12 after TEQLSP"
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// Test "Strange issue with r12 after TEQLSP"
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// Tests for bug where testlsp command would switch the core
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// Tests for bug where testlsp command would switch the core
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// from supervisor into FIRQ mode if it were executed. However the condition is not
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// from supervisor into FIRQ mode if it were executed. However the condition is not
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// met so it is not executed. Thje bug is the next instrument works in FIRQ mode anyway.
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// met so it is not executed. The bug is the next instrument works in FIRQ mode anyway.
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// This was caused because the mode bits used in the ececute stage were not conditional on the
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// This was caused because the mode bits used in the ececute stage were not conditional on the
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// teq instrumention being executed.
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// teq instrumention being executed.
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// Also tests correct setting of carry flag when second operand is a constant
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#include "amber_registers.h"
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#include "amber_registers.h"
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#include "amber_macros.h"
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#include "amber_macros.h"
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.section .text
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.section .text
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.globl main
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.globl main
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Line 67... |
mov r12, r6 // user r12 or FIRQ r12 ?
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mov r12, r6 // user r12 or FIRQ r12 ?
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cmp r12, r6 // error if user mode r12 was not updated with new value
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cmp r12, r6 // error if user mode r12 was not updated with new value
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bne testfail
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bne testfail
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// check the carry flag
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// When a flexible second operand constant is used with the instructions MOVS, MVNS, ANDS, ORRS, ORNS, EORS, BICS,
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// TEQ or TST, the carry flag is updated to bit[31] of the constant, if the constant is greater than 255
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// and can be produced by shifting an 8-bit value. These instructions do not affect the carry flag if
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// Operand2 is any other constant.
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teq r4, #0x80000000
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bcc testfail
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// keeps carry flag the same
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teq r4, #0x00000000
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bcc testfail
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// sets the carry flag back to zero
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teq r4, #0x40000000
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bcs testfail
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// set the carry flag and verify that teq with register for operand 2 does not clear it
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teq r4, #0x80000000
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mov r4, #0
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mov r5, #0x40000000
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teq r4, r5
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bcc testfail
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b testpass
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b testpass
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testfail:
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testfail:
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ldr r11, AdrTestStatus
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ldr r11, AdrTestStatus
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str r10, [r11]
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str r10, [r11]
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