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arch: arm: swap: Remove old context switch code

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Remove unused context switch code from the helper assembly file that
manages the SuperVisor Call invocations (SVCs). This is no longer in use
in the code, since all calls to __swap() now go through PendSV directly.

Signed-off-by: Carles Cufi <carles.cufi@nordicsemi.no>
This commit is contained in:
Carles Cufi 2018-05-23 13:33:18 +02:00 • committed by Andrew Boie
commit 5b37cd7346
1 changed files with 1 additions and 21 deletions
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22
arch/arm/core/swap_helper.S
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@ -305,7 +305,7 @@ SECTION_FUNC(TEXT, __svc)
/*
* grab service call number:
* 0: context switch
* 0: Unused
* 1: irq_offload (if configured)
* 2: kernel panic or oops (software generated fatal exception)
* 3: System call
@ -326,9 +326,7 @@ SECTION_FUNC(TEXT, __svc)
tst r2, #0x1
bne _oops
cmp r1, #0
#endif
beq _context_switch
cmp r1, #2
beq _oops
@ -342,24 +340,6 @@ SECTION_FUNC(TEXT, __svc)
b _IntExit
#endif
_context_switch:
/*
* Unlock interrupts:
* - in a SVC call, so protected against context switches
* - allow PendSV, since it's running at prio 0xff
*/
eors.n r0, r0
msr BASEPRI, r0
/* set PENDSV bit, pending the PendSV exception */
ldr r1, =_SCS_ICSR
ldr r2, =_SCS_ICSR_PENDSV
str r2, [r1, #0]
/* handler mode exit, to PendSV */
bx lr
_oops:
push {lr}
blx _do_kernel_oops