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* patch by Bernd which fixes InterLockedxxx functions on ARMv4T, resolves #25518

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git-svn-id: trunk@26792 -
This commit is contained in:
florian 2014-02-16 09:10:00 +00:00
parent 1882ab8d5a
commit 6e32f8ee8f
1 changed files with 46 additions and 5 deletions
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51
rtl/arm/arm.inc
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@ -584,8 +584,16 @@ asm
sub r3, r3, #0x3F
sub r1, r0, #1 // Decrement value
{$ifdef CPUARM_HAS_BLX}
blx r3 // Call kuser_cmpxchg, sets C-Flag on success
{$else}
mov lr, pc
{$ifdef CPUARM_HAS_BX}
bx r3
{$else}
mov pc, r3
{$endif}
{$endif}
// MOVS sets the Z flag when the result reaches zero, this can be used later on
// The C-Flag will not be modified by this because we're not doing any shifting
movcss r0, r1 // We expect that to work most of the time so keep it pipeline friendly
@ -675,8 +683,16 @@ asm
sub r3, r3, #0x3F
add r1, r0, #1 // Increment value
{$ifdef CPUARM_HAS_BLX}
blx r3 // Call kuser_cmpxchg, sets C-Flag on success
{$else}
mov lr, pc
{$ifdef CPUARM_HAS_BX}
bx r3
{$else}
mov pc, r3
{$endif}
{$endif}
movcs r0, r1 // We expect that to work most of the time so keep it pipeline friendly
ldmcsfd r13!, {pc}
b .Latomic_inc_loop // kuser_cmpxchg sets C flag on error
@ -738,8 +754,16 @@ asm
mvn r3, #0x0000f000
sub r3, r3, #0x3F
mov r4, r0 // save the current value because kuser_cmpxchg clobbers r0
{$ifdef CPUARM_HAS_BLX}
blx r3 // Call kuser_cmpxchg, sets C-Flag on success
{$else}
mov lr, pc
{$ifdef CPUARM_HAS_BX}
bx r3
{$else}
mov pc, r3
{$endif}
{$endif}
// restore the original value if needed
movcs r0, r4
ldmcsfd r13!, {r4, pc}
@ -803,7 +827,16 @@ asm
sub r3, r3, #0x3F
add r1, r0, r4 // Add to value
{$ifdef CPUARM_HAS_BLX}
blx r3 // Call kuser_cmpxchg, sets C-Flag on success
{$else}
mov lr, pc
{$ifdef CPUARM_HAS_BX}
bx r3
{$else}
mov pc, r3
{$endif}
{$endif}
// r1 does not get clobbered, so just get back the original value
// Otherwise we would have to allocate one more register and store the
// temporary value
@ -866,8 +899,16 @@ asm
// r1 and r2 will not be clobbered by kuser_cmpxchg
// If we have to loop, r0 will be set to the original Comperand
.Linterlocked_compare_exchange_loop:
blx r3 // Call kuser_cmpxchg sets C-Flag on success
{$ifdef CPUARM_HAS_BLX}
blx r3 // Call kuser_cmpxchg, sets C-Flag on success
{$else}
mov lr, pc
{$ifdef CPUARM_HAS_BX}
bx r3
{$else}
mov pc, r3
{$endif}
{$endif}
movcs r0, r4 // Return the previous value on success
ldmcsfd r13!, {r4, pc}
// The error case is a bit tricky, kuser_cmpxchg does not return the current value