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27 March 2024, 02:37:15 UTC
Revision 41d71fe59cce41237f24f3b7bdc1b414069a34ed authored by Heiko Carstens on 05 July 2021, 18:16:10 UTC, committed by Vasily Gorbik on 08 July 2021, 20:12:17 UTC 
s390: introduce proper type handling call_on_stack() macro
 
The existing CALL_ON_STACK() macro allows for subtle bugs:

- There is no type checking of the function that is being called. That
  is: missing or too many arguments do not cause any compile error or
  warning. The same is true if the return type of the called function
  changes. This can lead to quite random bugs.

- Sign and zero extension of arguments is missing. Given that the s390
  C ABI requires that the caller of a function performs proper sign
  and zero extension this can also lead to subtle bugs.

- If arguments to the CALL_ON_STACK() macros contain functions calls
  register corruption can happen due to register asm constructs being
  used.

Therefore introduce a new call_on_stack() macro which is supposed to
fix all these problems.

Reviewed-by: Sven Schnelle <svens@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
1 parent bb250e6
History
Tip revision: 41d71fe59cce41237f24f3b7bdc1b414069a34ed authored by Heiko Carstens on 05 July 2021, 18:16:10 UTC
s390: introduce proper type handling call_on_stack() macro
Tip revision: 41d71fe
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