49e22fe678
This is a small change to make it easier to support architectures that need to restore more than just the sp and pc registers. In particular, it is needed for the AVR architecture that needs to restore the frame pointer (Y register).
48 строки
1,2 КиБ
ArmAsm
48 строки
1,2 КиБ
ArmAsm
#ifdef __MACH__
|
|
.global _tinygo_scanCurrentStack
|
|
_tinygo_scanCurrentStack:
|
|
#else
|
|
.section .text.tinygo_scanCurrentStack
|
|
.global tinygo_scanCurrentStack
|
|
.type tinygo_scanCurrentStack, %function
|
|
tinygo_scanCurrentStack:
|
|
#endif
|
|
// Sources:
|
|
// * https://developer.arm.com/architectures/learn-the-architecture/armv8-a-instruction-set-architecture/procedure-call-standard
|
|
// * https://godbolt.org/z/qrvrEh
|
|
|
|
// Save callee-saved registers.
|
|
stp x29, x30, [sp, #-96]!
|
|
stp x28, x27, [sp, #16]
|
|
stp x26, x25, [sp, #32]
|
|
stp x24, x23, [sp, #48]
|
|
stp x22, x21, [sp, #64]
|
|
stp x20, x19, [sp, #80]
|
|
|
|
// Scan the stack.
|
|
mov x0, sp
|
|
#ifdef __MACH__
|
|
bl _tinygo_scanstack
|
|
#else
|
|
bl tinygo_scanstack
|
|
#endif
|
|
|
|
// Restore stack state and return.
|
|
ldp x29, x30, [sp], #96
|
|
ret
|
|
|
|
|
|
#ifdef __MACH__
|
|
.global _tinygo_longjmp
|
|
_tinygo_longjmp:
|
|
#else
|
|
.section .text.tinygo_longjmp
|
|
.global tinygo_longjmp
|
|
.type tinygo_longjmp, %function
|
|
tinygo_longjmp:
|
|
#endif
|
|
// Note: the code we jump to assumes x0 is set to a non-zero value if we
|
|
// jump from here (which is conveniently already the case).
|
|
ldp x1, x2, [x0] // jumpSP, jumpPC
|
|
mov sp, x1
|
|
br x2
|