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Remove SPARE_USRSPACE.

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This constant was used to reserve space at the top of the stack to
hold translated system call arguments for non-default ABIs (the
"stackgap").  However, none of the compatibility ABIs have used the
stackgap in many years and the last use of SPARE_USRSPACE was removed
in r355373.

Reviewed by:	kib
Sponsored by:	DARPA
Differential Revision:	https://reviews.freebsd.org/D22697
This commit is contained in:
John Baldwin 2019-12-06 19:20:45 +00:00
parent cb847b8152
commit d3cf9f3c1f
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=355459
1 changed files with 0 additions and 1 deletions
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sys/sys/exec.h
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@ -77,7 +77,6 @@ struct execsw {
* Prefer the kern.ps_strings or kern.proc.ps_strings sysctls to this constant.
*/
#define PS_STRINGS (USRSTACK - sizeof(struct ps_strings))
#define SPARE_USRSPACE 4096
int exec_map_first_page(struct image_params *);
void exec_unmap_first_page(struct image_params *);