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Revert "internal/abi, runtime, cmd: merge StackSmall, StackBig consts into internal/abi"

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This reverts commit CL 486379.

Submitted out of order and breaks bootstrap.

Change-Id: Ie20a61cc56efc79a365841293ca4e7352b02d86b
Reviewed-on: https://go-review.googlesource.com/c/go/+/486917
TryBot-Bypass: Austin Clements <austin@google.com>
Reviewed-by: David Chase <drchase@google.com>
This commit is contained in:
Austin Clements 2023-04-20 16:10:15 +00:00
parent d11ff3f081
commit 466e6dae95
12 changed files with 53 additions and 66 deletions
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14
src/runtime/stack.go
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@ -85,6 +85,13 @@ const (
_FixedStack6 = _FixedStack5 | (_FixedStack5 >> 16)
_FixedStack = _FixedStack6 + 1
// Functions that need frames bigger than this use an extra
// instruction to do the stack split check, to avoid overflow
// in case SP - framesize wraps below zero.
// This value can be no bigger than the size of the unmapped
// space at zero.
_StackBig = 4096
// The stack guard is a pointer this many bytes above the
// bottom of the stack.
//
@ -94,10 +101,15 @@ const (
// This arithmetic must match that in cmd/internal/objabi/stack.go:StackLimit.
_StackGuard = 928*sys.StackGuardMultiplier + _StackSystem
// After a stack split check the SP is allowed to be this
// many bytes below the stack guard. This saves an instruction
// in the checking sequence for tiny frames.
_StackSmall = 128
// The maximum number of bytes that a chain of NOSPLIT
// functions can use.
// This arithmetic must match that in cmd/internal/objabi/stack.go:StackLimit.
_StackLimit = _StackGuard - _StackSystem - abi.StackSmall
_StackLimit = _StackGuard - _StackSystem - _StackSmall
)
const (