.sect .text
-! Index into a bounds-checked array.
+! Get address of element of bounds-checked array.
!
-! On entry:
-! r3 = ptr to descriptor
-! r4 = index
-! r5 = address of array
-! Yields:
-! r3 = address of element
-! r0 = size of element (used by .lar4, .sar4)
+! Stack: ( array-adr index descriptor-adr -- element-adr )
+! Sets r3 = size of element for .los4, .sts4
! Preserves r10 for .lar4, .sar4
.define .aar4
ori r0, r0, lo16[.trap_earray]
mtspr ctr, r0 ! load CTR with trap address
- lwz r0, 0(r3)
- subf. r4, r0, r4 ! adjust range
- bltctr ! check lower bound
+ lwz r4, 0(sp) ! r4 = address of descriptor
+ lwz r5, 4(sp) ! r5 = index
+ lwz r6, 8(sp) ! r6 = address of array
- lwz r0, 4(r3)
- cmplw r4, r3
- bgectr ! check upper bound
+ lwz r0, 0(r4)
+ subf. r5, r0, r5 ! subtract lower bound from index
+ bltctr ! check lower bound
- lwz r0, 8(r3)
- mullw r4, r4, r0 ! scale index
- add r3, r4, r5 ! calculate element address
+ lwz r0, 4(r4)
+ cmplw r5, r0
+ bgtctr ! check upper bound
+ lwz r3, 8(r4) ! r3 = size of element
+ mullw r5, r5, r3 ! scale index by size
+ add r6, r6, r5
+ stw r6, 8(sp) ! push address of element
+ addi sp, sp, 8
blr
acklibrary {
name = "lib_"..plat,
srcs = {
- "./*.s",
+ "./*.s", -- los4.s, sts4.s
},
vars = { plat = plat },
deps = {
! Load from bounds-checked array.
!
-! On entry:
-! r3 = ptr to descriptor
-! r4 = index
-! r5 = address of array
+! Stack: ( array-adr index descriptor-adr -- element )
.define .lar4
.lar4:
mfspr r10, lr
bl .aar4
+ ! pass r3 = size from .aar4 to .los4
+ bl .los4
mtspr lr, r10
- ! r3 = ptr to element
- ! r0 = size of element
-
- cmpwi r0, 1
- bne 1f
- ! Load 1 byte.
- lbz r4, 0(r3)
- stwu r4, -4(sp)
- blr
-1:
- cmpwi r0, 2
- bne 2f
- ! Load 2 bytes.
- lhz r4, 0(r3)
- stwu r4, -4(sp)
- blr
-2:
- ! Load r0 bytes, where r0 must be a positive multiple of 4.
- subf sp, r0, sp ! move stack pointer down
- or r5, r0, r0 ! index r5 = length r0
-3:
- addic. r5, r5, -4 ! r5 -= 4
- lwzx r4, r5, r3
- stwx r4, r5, sp
- bgt 3b ! loop if r5 > 0
blr
+++ /dev/null
-.sect .text
-
-! Loads a variable-sized structure onto the stack.
-!
-! r3 = size
-! r4 = address
-
-.define .los
-.los:
- ! These sizes are handled specially.
-
- cmplwi r3, 1
- ble size1
-
- cmplwi r3, 2
- ble size2
-
- cmplwi r3, 4
- ble size4
-
- ! Variable-sized structure.
-
- addi r3, r3, 3
- clrrwi r3, r3, 2 ! align size
-
- add r4, r4, r3 ! adjust address to top of block
-
- srwi r3, r3, 2 ! convert size to the number of words
- mtspr ctr, r3
-
-1:
- lwzu r5, -4(r4)
- stwu r5, -4(sp)
- bdnz 1b ! decrement CTR, jump if non-zero
- blr
-
-size1:
- lbz r3, 0(r4)
- b 1f
-size2:
- lhz r3, 0(r4)
- b 1f
-size4:
- lwz r3, 0(r4)
-1:
- stwu r3, -4(sp)
- blr
--- /dev/null
+.sect .text
+
+! Loads a variable-sized block onto the stack.
+!
+! On entry: r3 = size
+! Stack: ( address -- block )
+! Preserves r10 for .lar4
+
+.define .los4
+.los4:
+ lwz r4, 0(sp) ! r4 = address
+
+ ! Sizes 1 and 2 are handled specially.
+ cmplwi r3, 1
+ ble 1f
+ cmplwi r3, 2
+ ble 2f
+
+ ! Else the size must be a multiple of 4.
+ srwi r5, r3, 2
+ mtspr ctr, r5 ! ctr = number of words
+ addi sp, sp, 4
+ add r4, r4, r3 ! adjust address to end of block
+4: lwzu r5, -4(r4)
+ stwu r5, -4(sp)
+ bdnz 4b ! decrement ctr, jump if non-zero
+ blr
+
+1: lbz r5, 0(r4)
+ stw r5, 0(sp)
+ blr
+2: lhz r5, 0(r4)
+ stw r5, 0(sp)
+ blr
! Store to bounds-checked array.
!
-! On entry:
-! r3 = ptr to descriptor
-! r4 = index
-! r5 = address of array
+! Stack: ( element array-adr index descriptor-adr -- )
.define .sar4
.sar4:
mfspr r10, lr
bl .aar4
+ ! pass r3 = size from .aar4 to .sts4
+ bl .sts4
mtspr lr, r10
- ! r3 = ptr to element
- ! r0 = size of element
-
- cmpwi r0, 1
- bne 1f
- ! Store 1 byte.
- lwz r4, 0(sp)
- addi sp, sp, 4
- stb r4, 0(r3)
- blr
-1:
- cmpwi r0, 2
- bne 2f
- ! Store 2 bytes.
- lwz r4, 0(sp)
- addi sp, sp, 4
- sth r4, 0(r3)
- blr
-2:
- ! Store r0 bytes, where r0 must be a positive multiple of 4.
- or r5, r0, r0 ! index r5 = length r0
-3:
- addic. r5, r5, -4 ! r5 -= 4
- lwzx r4, r5, sp
- stwx r4, r5, r3
- bgt 3b ! loop if r5 > 0
- add sp, r0, sp ! move stack pointer up
blr
+++ /dev/null
-.sect .text
-
-! Stores a variable-sized structure from the stack.
-!
-! r3 = size
-! r4 = address
-
-.define .sts
-.sts:
- ! These sizes are handled specially.
-
- lwz r5, 0(sp)
-
- cmplwi r3, 1
- ble size1
-
- cmplwi r3, 2
- ble size2
-
- cmplwi r3, 4
- ble size4
-
- ! Variable-sized structure.
-
- addi r3, r3, 3
- clrrwi r3, r3, 2 ! align size
-
- srwi r3, r3, 2 ! convert size to the number of words
- mtspr ctr, r3
-
-1:
- lwz r5, 0(sp)
- addi sp, sp, 4
- stw r5, 0(r4)
- addi r4, r4, 4
-
- bdnz 1b ! decrement CTR, jump if non-zero
- blr
-
-size1:
- stb r5, 0(r4)
- b 1f
-size2:
- sth r5, 0(r4)
- b 1f
-size4:
- stw r5, 0(r4)
-1:
- addi sp, sp, 4
- blr
--- /dev/null
+.sect .text
+
+! Stores a variable-sized block from the stack.
+!
+! On entry: r3 = size
+! Stack: ( block address -- )
+! Preserves r10 for .sar4
+
+.define .sts4
+.sts4:
+ lwz r4, 0(sp) ! r4 = address
+
+ ! Sizes 1 and 2 are handled specially.
+ cmplwi r3, 1
+ ble 1f
+ cmplwi r3, 2
+ ble 2f
+
+ ! Else the size must be a multiple of 4.
+ srwi r5, r3, 2
+ mtspr ctr, r5 ! ctr = number of words
+ addi r4, r4, -4 ! adjust address to before block
+4: lwzu r5, 4(sp)
+ stwu r5, 4(r4)
+ bdnz 4b ! decrement ctr, jump if non-zero
+ addi sp, sp, 4
+ blr
+
+1: lwz r5, 4(sp)
+ stb r5, 0(r4)
+ b 3f
+2: lwz r5, 4(sp)
+ sth r5, 0(r4)
+3: addi sp, sp, 8
+ blr
pat loi /* Load arbitrary size */
leaving
loc $1
- los INT32
+ los 4
- pat los $1==INT32 /* Load arbitrary size */
- with GPR3 GPR4 STACK
+ pat los $1==4 /* Load arbitrary size */
+ with GPR3 STACK
kills ALL
gen
- bl {LABEL, ".los"}
+ bl {LABEL, ".los4"}
pat sti $1==INT8 /* Store byte indirect */
with REG REG
pat sti /* Store arbitrary size */
leaving
loc $1
- sts INT32
+ sts 4
- pat sts $1==INT32 /* Store arbitrary size */
- with GPR3 GPR4 STACK
+ pat sts $1==4 /* Store arbitrary size */
+ with GPR3 STACK
kills ALL
gen
- bl {LABEL, ".sts"}
+ bl {LABEL, ".sts4"}
/* Arithmetic wrappers */
yields %a
-
/* Arrays */
- pat aar $1==INT32 /* Index array */
- with GPR3 GPR4 GPR5
+ pat aar $1==4 /* Address of array element */
+ leaving
+ cal ".aar4"
+
+ pat lar $1==4 /* Load from array */
+ with STACK
kills ALL
gen
bl {LABEL, ".aar4"}
- yields R3
+ /* pass r3 = size from .aar4 to .los4 */
+ bl {LABEL, ".los4"}
- pat lae lar $2==INT32 && nicesize(rom($1, 3)) /* Load array */
+ pat lae lar $2==4 && nicesize(rom($1, 3))
leaving
lae $1
- aar INT32
+ aar 4
loi rom($1, 3)
- pat lar $1==INT32 /* Load array */
- with GPR3 GPR4 GPR5 STACK
+ pat sar $1==4 /* Store to array */
+ with STACK
kills ALL
gen
- bl {LABEL, ".lar4"}
+ bl {LABEL, ".aar4"}
+ /* pass r3 = size from .aar4 to .sts4 */
+ bl {LABEL, ".sts4"}
- pat lae sar $2==INT32 && nicesize(rom($1, 3)) /* Store array */
+ pat lae sar $2==4 && nicesize(rom($1, 3))
leaving
lae $1
- aar INT32
+ aar 4
sti rom($1, 3)
- pat sar $1==INT32 /* Store array */
- with GPR3 GPR4 GPR5 STACK
- kills ALL
- gen
- bl {LABEL, ".sar4"}
-
/* Sets */
public / ack.git / commitdiff