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-/*
- * QuickThreads -- Threads-building toolkit.
- * Copyright (c) 1993 by David Keppel
- *
- * Permission to use, copy, modify and distribute this software and
- * its documentation for any purpose and without fee is hereby
- * granted, provided that the above copyright notice and this notice
- * appear in all copies. This software is provided as a
- * proof-of-concept and for demonstration purposes; there is no
- * representation about the suitability of this software for any
- * purpose.
- */
-
- .file "ksr1.s"
- .def .debug; .endef
-
- .align 128
- .globl qt_blocki
- .globl qt_blocki$TXT
- .globl qt_block
- .globl qt_block$TXT
- .globl qt_start$TXT
- .globl qt_start
- .globl qt_abort$TXT
- .globl qt_abort
- .globl qt_vstart
- .globl qt_vstart$TXT
-
-#
-# KSR convention: on procedure calls, load both the procedure address
-# and a pointer to a constant block. The address of function `f' is
-# `f$TXT', and the constant block address is `f'. The constant block
-# has several reserved values:
-#
-# 8 bytes fpu register save mask
-# 4 bytes ipu register save mask
-# 4 bytes ceu register save mask
-# f: f$TXT
-# ... whatever you want ... (not quite...read on)
-#
-# Note, by the way, that a pointer to a function is passed as a
-# pointer to the constant area, and the constant area has the text
-# address.
-#
-
-#
-# Procedures that do not return structures prefix their code with
-#
-# proc$TXT:
-# finop; cxnop
-# finop; cxnop
-# <proc code>
-#
-# Calls to those procedures branch to a 16 byte offset (4 instrs) in
-# to the procedure to skip those instructions.
-#
-# Procedures that return structures use a different code prefix:
-#
-# proc$TXT:
-# finop; beq.qt %rc, %rc, 24 # return value entry
-# finop; cxnop
-# finop; movi8 0, %rc # no return value entry
-# <proc code>
-#
-# Calls that want the returned structure branch directly to the
-# procedure address. Callers that don't want (or aren't expecting) a
-# return value branche 16 bytes in to the procedure, which will zero
-# %rc, telling the called procedure not to return a structure.
-#
-
-#
-# On entry:
-# %i2 -- control block of helper function to run
-# (dereference to get helper)
-# %i3 -- a1
-# %i4 -- a2
-# %i5 -- sp of new to run
-#
-
- .data
- .half 0x0, 0x0, 0x7ffff000, 0x7fff8000
-qt_blocki:
-qt_abort:
- .word qt_blocki$TXT
- .word qt_restore$TXT
-
- .text
-qt_abort$TXT:
-qt_blocki$TXT:
- finop ; cxnop # entry prefix
- finop ; cxnop # entry prefix
- add8.ntr 75,%i31,%i31 ; movi8 512,%c5 # ICR; stk adjust
- finop ; ssub8.ntr 0,%sp,%c5,%sp
- finop ; st8 %fp,504(%sp) # Save caller's fp
- finop ; st8 %cp,496(%sp) # Save caller's cp
- finop ; ld8 8(%c10),%c5 # ld qt_restore$TXT
- finop ; st8 %c14,0(%sp) # Save special ret addr
- finop ; mov8_8 %c10, %cp # Our cp
- finop ; sadd8.ntr 0,%sp,%c5,%fp # Our frame ptr
- finop ; st8 %c5,8(%sp) # st qt_restore$TXT
-#
-# CEU registers %c15-%c24, %c26-%c30 (%c14 we restore later)
-#
- finop ; st8 %c15,456(%sp)
- finop ; st8 %c16,448(%sp)
- finop ; st8 %c17,440(%sp)
- finop ; st8 %c18,432(%sp)
- finop ; st8 %c19,424(%sp)
- finop ; st8 %c20,416(%sp)
- finop ; st8 %c21,408(%sp)
- finop ; st8 %c22,400(%sp)
- finop ; st8 %c23,392(%sp)
- finop ; st8 %c24,384(%sp)
-#
-# %c25 is the Enclosing Frame Pointer (EFP) -- since C doesn't
-# use nested procedures, we ignore it (leaving a gap, though)
-#
- finop ; st8 %c26,368(%sp)
- finop ; st8 %c27,360(%sp)
- finop ; st8 %c28,352(%sp)
- finop ; st8 %c29,344(%sp)
- finop ; st8 %c30,336(%sp)
-#
-# IPU registers %i12-%i30
-#
- finop ; st8 %i12,328(%sp)
- finop ; st8 %i13,320(%sp)
- finop ; st8 %i14,312(%sp)
- finop ; st8 %i15,304(%sp)
-# (gap to get alignment for st64)
-# -- Doesn't work on version 1.1.3 of the OS
-# finop ; st64 %i16,256(%sp)
-
- finop ; st8 %i16,256(%sp)
- finop ; st8 %i17,248(%sp)
- finop ; st8 %i18,240(%sp)
- finop ; st8 %i19,232(%sp)
- finop ; st8 %i20,224(%sp)
- finop ; st8 %i21,216(%sp)
- finop ; st8 %i22,208(%sp)
- finop ; st8 %i23,200(%sp)
- finop ; st8 %i24,192(%sp)
- finop ; st8 %i25,184(%sp)
- finop ; st8 %i26,176(%sp)
- finop ; st8 %i27,168(%sp)
- finop ; st8 %i28,160(%sp)
- finop ; st8 %i29,152(%sp)
- finop ; st8 %i30,144(%sp)
-#
-# FPU already saved, or saving not necessary
-#
-
-#
-# Switch to the stack passed in as fourth argument to the block
-# routine (%i5) and call the helper routine passed in as the first
-# argument (%i2). Note that the address of the helper's constant
-# block is passed in, so we must derefence it to get the helper's text
-# address.
-#
- finop ; movb8_8 %i2,%c10 # helper's ConstBlock
- finop ; cxnop # Delay slot, fill w/
- finop ; cxnop # .. 2 st8 from above
- finop ; ld8 0(%c10),%c4 # load addr of helper
- finop ; movb8_8 %sp, %i2 # 1st arg to helper
- # is this stack; other
- # args remain in regs
- finop ; movb8_8 %i5,%sp # switch stacks
- finop ; jsr %c14,16(%c4) # call helper
- movi8 3, %i0 ; movi8 0,%c8 # nargs brain dmg
- finop ; cxnop
- finop ; cxnop
-#
-# Here is where behavior differs for threads being restored and threads
-# being started. Blocked threads have a pointer to qt_restore$TXT on
-# the top of their stacks; manufactured stacks have a pointer to qt_start$TXT
-# on the top of their stacks. With this setup, starting threads
-# skip the (unecessary) restore operations.
-#
-# We jump to an offset of 16 to either (1) skip past the two noop pairs
-# at the start of qt_start$TXT, or (2) skip past the two noop pairs
-# after qt_restore$TXT.
-#
- finop ; ld8 8(%sp),%c4
- finop ; cxnop
- finop ; cxnop
- finop ; jmp 16(%c4)
-qt_restore$TXT:
- finop ; cxnop
- finop ; cxnop
-#
-# Point of Restore:
-#
-# The helper funtion will return here. Any result it has placed in
-# a return register (most likely %i0) will not get overwritten below
-# and will consequently be the return value of the blocking routine.
-#
-
-#
-# CEU registers %c15-%c24, %c26-%c30 (%c14 we restore later)
-#
- finop ; ld8 456(%sp),%c15
- finop ; ld8 448(%sp),%c16
- finop ; ld8 440(%sp),%c17
- finop ; ld8 432(%sp),%c18
- finop ; ld8 424(%sp),%c19
- finop ; ld8 416(%sp),%c20
- finop ; ld8 408(%sp),%c21
- finop ; ld8 400(%sp),%c22
- finop ; ld8 392(%sp),%c23
- finop ; ld8 384(%sp),%c24
-#
-# %c25 is the Enclosing Frame Pointer (EFP) -- since C doesn't
-# use nested procedures, we ignore it (leaving a gap, though)
-#
- finop ; ld8 368(%sp),%c26
- finop ; ld8 360(%sp),%c27
- finop ; ld8 352(%sp),%c28
- finop ; ld8 344(%sp),%c29
- finop ; ld8 336(%sp),%c30
-#
-# IPU registers %i12-%i30
-#
- finop ; ld8 328(%sp),%i12
- finop ; ld8 320(%sp),%i13
- finop ; ld8 312(%sp),%i14
- finop ; ld8 304(%sp),%i15
-# (gap to get alignment for ld64)
-# -- Doesn't work on version 1.1.3 of the OS
-# finop ; ld64 256(%sp),%i16
-
- finop ; ld8 256(%sp),%i16
- finop ; ld8 248(%sp),%i17
- finop ; ld8 240(%sp),%i18
- finop ; ld8 232(%sp),%i19
- finop ; ld8 224(%sp),%i20
- finop ; ld8 216(%sp),%i21
- finop ; ld8 208(%sp),%i22
- finop ; ld8 200(%sp),%i23
- finop ; ld8 192(%sp),%i24
- finop ; ld8 184(%sp),%i25
- finop ; ld8 176(%sp),%i26
- finop ; ld8 168(%sp),%i27
- finop ; ld8 160(%sp),%i28
- finop ; ld8 152(%sp),%i29
- finop ; ld8 144(%sp),%i30
-
-#
-# FPU registers don't need to be loaded, or will be loaded by an
-# enclosing scope (e.g., if this is called by qt_block).
-#
-
-#
-# Load the special registers. We don't load the stack ptr because
-# the new stack is passed in as an argument, we don't load the EFP
-# because we don't use it, and we load the return address specially
-# off the top of the stack.
-#
- finop ; ld8 0(%sp),%c14 # return addr
- finop ; ld8 496(%sp),%cp
- finop ; ld8 504(%sp),%fp
-
- finop ; jmp 32(%c14) # jump back to thread
- finop ; movi8 512,%c5 # stack adjust
- finop ; sadd8.ntr 0,%sp,%c5,%sp
-
- .data
- .half 0x0, 0x0, 0x7ffff000, 0x7fff8000
-qt_block:
- .word qt_block$TXT
- .word qt_error
- .word qt_error$TXT
- .word qt_blocki
-#
-# Handle saving and restoring the FPU regs, relying on qt_blocki
-# to save and restore the remaining registers.
-#
- .text
-qt_block$TXT:
- finop ; cxnop # entry prefix
- finop ; cxnop # entry prefix
-
- add8.ntr 29,%i31,%i31 ; movi8 512,%c5 # ICR; stk adjust
- finop ; ssub8.ntr 0,%sp,%c5,%sp
- finop ; st8 %fp,504(%sp) # Save caller's fp
- finop ; st8 %cp,496(%sp) # Save caller's cp
- finop ; st8 %c14,488(%sp) # store ret addr
- finop ; sadd8.ntr 0,%sp,%c5,%fp # Our frame ptr
- finop ; mov8_8 %c10, %cp # Our cp
-
-#
-# Store 8 registers at once...destination must be a multiple of 64
-#
- finop ; st64 %f16,384(%sp)
- finop ; st64 %f24,320(%sp)
- finop ; st64 %f32,256(%sp)
- finop ; st64 %f40,192(%sp)
- finop ; st64 %f48,128(%sp)
- finop ; st64 %f56,64(%sp)
-
-#
-# Call the integer blocking routine, passing the arguments passed to us
-#
- finop ; ld8 24(%cp), %c10
- finop ; cxnop
- finop ; jsr %c14, qt_blocki$TXT
- finop ; cxnop
- finop ; cxnop
- movi8 4,%i0 ; movi8 0,%c8 # nargs brain dmg
-
-#
-# Load 8 registers at once...source must be a multiple of 64
-#
- finop ; ld64 64(%sp),%f56
- finop ; ld64 128(%sp),%f48
- finop ; ld64 192(%sp),%f40
- finop ; ld64 256(%sp),%f32
- finop ; ld64 320(%sp),%f24
- finop ; ld64 384(%sp),%f16
-
- finop ; ld8 488(%sp),%c14
- finop ; ld8 496(%sp),%cp
- finop ; ld8 504(%sp),%fp
- finop ; jmp 32(%c14) # jump back to thread
- finop ; movi8 512,%c5 # stack adjust
- finop ; sadd8.ntr 0,%sp,%c5,%sp
-
-
- .data
- .half 0x0, 0x0, 0x7ffff000, 0x7fff8000
-qt_start:
- .word qt_start$TXT
-#
-# A new thread is set up to "appear" as if it were executing code at
-# the beginning of qt_start and then it called a blocking routine
-# (qt_blocki). So when a new thread starts to run, it gets unblocked
-# by the code above and "returns" to `qt_start$TXT' in the
-# restore step of the switch. Blocked threads jump to 16(qt_restore$TXT),
-# and starting threads jump to 16(qt_start$TXT).
-#
- .text
-qt_start$TXT:
- finop ; cxnop #
- finop ; cxnop #
- finop ; ld8 40(%sp),%c10 # `only' constant block
- finop ; ld8 32(%sp),%i4 # `userf' arg.
- finop ; ld8 24(%sp),%i3 # `t' arg.
- finop ; ld8 0(%c10),%c4 # `only' text location
- finop ; ld8 16(%sp),%i2 # `u' arg.
- finop ; cxnop
- finop ; jsr %c14,16(%c4) # call `only'
-#
-# Pop the frame used to store the thread's initial data
-#
- finop ; sadd8.ntr 0,%sp,128,%sp
- finop ; cxnop
- movi8 2,%i0 ; movi8 0,%c8 # nargs brain dmg
-#
-# If we ever return, it's an error.
-#
- finop ; jmp qt_error$TXT
- finop ; cxnop
- finop ; cxnop
- movi8 0,%i0 ; movi8 0,%c8 # nargs brain dmg
-
-
-#
-# This stuff is broken
-#
- .data
- .half 0x0, 0x0, 0x7ffff000, 0x7fff8000
-qt_vstart:
- .word qt_vstart$TXT
-
- .text
-qt_vstart$TXT:
- finop ; cxnop # entry prefix
- finop ; cxnop # entry prefix
- finop ; cxnop
- finop ; cxnop
- add8.ntr 11,%i31,%i31 ; movi8 512,%c5
- finop ; ssub8.ntr 0,%sp,%c5,%sp # fix stack
- finop ; ld8 8(%sp),%i2 # load `t' as arg to
- finop ; cxnop # `startup'
- finop ; cxnop
- finop ; ld8 16(%sp),%c10 # `startup' const block
- finop ; cxnop
- finop ; cxnop
- finop ; ld8 0(%c10),%c4 # `startup' text loc.
- finop ; cxnop
- finop ; cxnop
- finop ; jsr %c14,16(%c4) # call `startup'
- finop ; cxnop
- finop ; cxnop
- movi8 1, %i0 ; movi8 0,%c8 # nargs brain dmg
-#
-# finop ; sadd 0,%sp,128,%sp # alter stack
-#
- finop ; ld8 8(%sp),%i2 # load `t' as arg to
- finop ; ld8 8(%sp),%i2 # load `t' as arg to
- finop ; ld8 8(%sp),%i2 # load `t' as arg to
- finop ; ld8 8(%sp),%i2 # load `t' as arg to
-
- finop ; ld8 32(%sp),%c10 # `only' constant block
- finop ; ld8 8(%sp),%i2 # `u' arg.
- finop ; ld8 16(%sp),%i3 # `t' arg.
- finop ; ld8 0(%c10),%c4 # `only' text location
- finop ; ld8 24(%sp),%i4 # `userf' arg.
- finop ; cxnop
- finop ; jsr %c4,16(%c4) # call `only'
- finop ; cxnop
- finop ; cxnop
-#
-# If the callee ever calls `nargs', the following instruction (pair)
-# will be executed. However, we don't know when we compile this code
-# how many args are being passed. So we give our best guess: 0.
-#
- movi8 0,%i0 ; movi8 0,%c8 # nargs brain dmg
-#
-# If we ever return, it's an error.
-#
- finop ; jmp qt_error$TXT
- finop ; cxnop
- finop ; cxnop
- movi8 0,%i0 ; movi8 0,%c8 # nargs brain dmg