[kvm-unit-tests PATCH v2 3/8] RFC: s390x: Define STACK_FRAME_INT_SIZE macro

Janosch Frank
2021-02-17T14:43:24Z

Using sizeof is safer than using magic constants. However, it doesn't
really fit into asm-offsets.h as it's not an offset so I'm happy to
receive suggestions on where to put it.

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
---
lib/s390x/asm-offsets.c | 1 +
s390x/macros.S | 4 ++--
2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/lib/s390x/asm-offsets.c b/lib/s390x/asm-offsets.c
index 96cb21cf..2658b59a 100644
--- a/lib/s390x/asm-offsets.c
+++ b/lib/s390x/asm-offsets.c
@@ -86,6 +86,7 @@ int main(void)
OFFSET(STACK_FRAME_INT_CRS, stack_frame_int, crs);
OFFSET(STACK_FRAME_INT_GRS0, stack_frame_int, grs0);
OFFSET(STACK_FRAME_INT_GRS1, stack_frame_int, grs1);
+ DEFINE(STACK_FRAME_INT_SIZE, sizeof(struct stack_frame_int));

return 0;
}
diff --git a/s390x/macros.S b/s390x/macros.S
index d7eeeb55..a7d62c6f 100644
--- a/s390x/macros.S
+++ b/s390x/macros.S
@@ -43,14 +43,14 @@
/* Save registers on the stack (r15), so we can have stacked interrupts. */
.macro SAVE_REGS_STACK
/* Allocate a full stack frame */
- slgfi %r15, 32 * 8 + 4 * 8
+ slgfi %r15, STACK_FRAME_INT_SIZE
/* Store registers r0 to r14 on the stack */
stmg %r2, %r15, STACK_FRAME_INT_GRS0(%r15)
stg %r0, STACK_FRAME_INT_GRS1(%r15)
stg %r1, STACK_FRAME_INT_GRS1 + 8(%r15)
/* Store the gr15 value before we allocated the new stack */
lgr %r0, %r15
- algfi %r0, 32 * 8 + 4 * 8
+ algfi %r0, STACK_FRAME_INT_SIZE
stg %r0, 13 * 8 + STACK_FRAME_INT_GRS0(%r15)
stg %r0, STACK_FRAME_INT_BACKCHAIN(%r15)
/*
--
2.25.1