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/* Implementation of the AIX-like PowerPC ABI. Seems to be used by the big-endian PowerPC targets.
The following references were used during the implementation of this code:
https://www.ibm.com/support/knowledgecenter/en/ssw_aix_72/com.ibm.aix.alangref/idalangref_rntime_stack.htm
https://www.ibm.com/support/knowledgecenter/en/ssw_aix_72/com.ibm.aix.alangref/idalangref_reg_use_conv.htm
https://www.ibm.com/developerworks/library/l-powasm4/index.html
*/
#include "psm.h"
.text
.globl rust_psm_stack_direction
.p2align 2
.type rust_psm_stack_direction,@function
rust_psm_stack_direction:
/* extern "C" fn() -> u8 */
.cfi_startproc
li 3, STACK_DIRECTION_DESCENDING
blr
.rust_psm_stack_direction_end:
.size rust_psm_stack_direction,.rust_psm_stack_direction_end-rust_psm_stack_direction
.cfi_endproc
.globl rust_psm_stack_pointer
.p2align 2
.type rust_psm_stack_pointer,@function
rust_psm_stack_pointer:
/* extern "C" fn() -> *mut u8 */
.cfi_startproc
mr 3, 1
blr
.rust_psm_stack_pointer_end:
.size rust_psm_stack_pointer,.rust_psm_stack_pointer_end-rust_psm_stack_pointer
.cfi_endproc
.globl rust_psm_replace_stack
.p2align 2
.type rust_psm_replace_stack,@function
rust_psm_replace_stack:
/* extern "C" fn(3: usize, 4: extern "C" fn(usize), 5: *mut u8) */
.cfi_startproc
ld 2, 8(4)
ld 4, 0(4)
/* do not allocate the whole 112-byte sized frame, we know wont be used */
addi 5, 5, -48
mr 1, 5
mtctr 4
bctr
.rust_psm_replace_stack_end:
.size rust_psm_replace_stack,.rust_psm_replace_stack_end-rust_psm_replace_stack
.cfi_endproc
.globl rust_psm_on_stack
.p2align 2
.type rust_psm_on_stack,@function
rust_psm_on_stack:
/* extern "C" fn(3: usize, 4: usize, 5: extern "C" fn(usize, usize), 6: *mut u8) */
.cfi_startproc
mflr 0
std 2, -72(6)
std 0, -8(6)
sub 6, 6, 1
addi 6, 6, -112
stdux 1, 1, 6
.cfi_def_cfa r1, 112
.cfi_offset r1, -112
.cfi_offset r2, -72
.cfi_offset lr, -8
/* load the function pointer from TOC and make the call */
ld 2, 8(5)
ld 5, 0(5)
mtctr 5
bctrl
ld 2, 40(1)
.cfi_restore r2
ld 0, 104(1)
mtlr 0
.cfi_restore lr
/* FIXME: after this instruction backtrace breaks until control returns to the caller.
That being said compiler-generated code has the same issue, so I guess that is fine for now?
*/
ld 1, 0(1)
.cfi_restore r1
blr
.rust_psm_on_stack_end:
.size rust_psm_on_stack,.rust_psm_on_stack_end-rust_psm_on_stack
.cfi_endproc
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