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602 smtp trap handler pushpop fails for ecalls 1 #613

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602 smtp trap handler pushpop fails for ecalls 1 #613

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f7f758d
Smtp: Making stack layout normative
christian-herber-nxp Sep 22, 2025
dca3ed4
Smtp: Fixing typo in stack definition
christian-herber-nxp Sep 22, 2025
d65e7ba
Smtp: changing stack offsets to negative ones
christian-herber-nxp Sep 26, 2025
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40 changes: 20 additions & 20 deletions src/aclic.adoc
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Original file line number Diff line number Diff line change
Expand Up @@ -1044,9 +1044,9 @@ Once the instruction retires, or the interrupts are disabled, no late preemption

=== Stack layout

To ease debugging, a stack layout is recommended for the saved context.

NOTE: This stack layout is not mandated to allow e.g. shadow register sets
Trap handlers may need to access stacked context.
E.g. an ECALL handler needs to increment the epc value by 4 to avoid re-executing the ECALL instruction.
To simplify access to the stacked context, the stack layout is defined as follows.

[source]
----
Expand All @@ -1056,23 +1056,23 @@ NOTE: This stack layout is not mandated to allow e.g. shadow register sets

stack pointer adjustment: 32

24: x15
20: x14
16: x13
12: x12
8: x11
4: x10
-24: x15
-20: x14
-16: x13
-12: x12
-8: x11
-4: x10

** XLEN = 64:

stack pointer adjustment: 48

48: x15
40: x14
32: x13
24: x12
16: x11
8: x10
-48: x15
-40: x14
-32: x13
-24: x12
-16: x11
-8: x10

* Smnip/Ssnip present:

Expand All @@ -1082,15 +1082,15 @@ start of stackframe remains same. In addition:

stack pointer adjustment: 32

32: xpistatus (XLEN)
28: xpepc (XLEN)
-32: xpistatus (XLEN)
-28: xpepc (XLEN)

** XLEN = 32
** XLEN = 64

stack pointer adjustment: 64

60: xpistatus (XLEN)
56: xpepc (XLEN)
-64: xpistatus (XLEN)
-56: xpepc (XLEN)
----

=== Fault handling
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