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use and in SVC instruction #2131

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use and in SVC instruction #2131

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7 changes: 3 additions & 4 deletions sys/kern/src/arch/arm_m.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -862,8 +862,8 @@ cfg_if::cfg_if! {
SVCall:
@ Inspect LR to figure out the caller's mode.
mov r0, lr
ldr r1, =0xFFFFFFF3
bics r0, r0, r1
movs r1, #0xC
ands r0, r1
@ Is the call coming from thread mode + main stack, i.e.
@ from the kernel startup routine?
cmp r0, #0x8
Expand Down Expand Up @@ -939,8 +939,7 @@ cfg_if::cfg_if! {
SVCall:
@ Inspect LR to figure out the caller's mode.
mov r0, lr
mov r1, #0xFFFFFFF3
bic r0, r1
and r0, r0, #0xC
@ Is the call coming from thread mode + main stack, i.e.
@ from the kernel startup routine?
cmp r0, #0x8
Expand Down