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ARM dynarec: Do not use the stack at all 

Fix a C func call while at it. This is a prerequisite to make the
dynarec re-entrant and get rid of libco
This commit is contained in:
David Guillen Fandos 2021-03-05 17:47:20 +01:00
parent 7bebd3051c
commit d21478e06e
1 changed files with 15 additions and 4 deletions
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19
arm/arm_stub.S
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@ -40,6 +40,8 @@
#define CPU_HALT_STATE (30 * 4)
#define CHANGED_PC_STATUS (31 * 4)
#define REG_HOST_SP (32 * 4)
#define reg_a0 r0
#define reg_a1 r1
@ -141,13 +143,15 @@
@ Align the stack to 64 bits (ABIs that don't require it, still recommend so)
#define call_c_saved_regs r2, r3, r12, lr
@ Calls a C function - all caller save registers which are important to the
@ dynarec and to returning from this function are saved.
@ Calls a C function - reloads the stack pointer and saves all caller save
@ registers which are important to the dynarec.
#define call_c_function(function) ;\
ldr sp, [reg_base, #REG_HOST_SP] ;\
stmdb sp!, { call_c_saved_regs } ;\
bl function ;\
ldmia sp!, { call_c_saved_regs } ;\
ldr sp, =base_reg_area ;\
@ Update the GBA hardware (video, sound, input, etc)
@ -475,7 +479,9 @@ execute_swi_function_builder(div, thumb)
.globl _execute_arm_translate
execute_arm_translate:
_execute_arm_translate:
sub sp, sp, #0x100 @ allocate room for register data
ldr r1, =base_reg_area @ base_reg_area to r1
str sp, [r1, #REG_HOST_SP] @ store the current sp
ldr sp, =base_reg_area @ reg_base = sp (loading addr)
mvn reg_cycles, r0 @ load cycle counter
@ -603,7 +609,7 @@ write_epilogue:
store_registers_arm() @ save ARM registers
3:
bl update_gba @ update GBA until CPU isn't halted
call_c_function(update_gba) @ update GBA until CPU isn't halted
mvn reg_cycles, r0 @ load new cycle count
ldr r0, [reg_base, #REG_PC] @ load new PC
@ -727,3 +733,8 @@ execute_load_builder(u32, 32, ldrne, #0xF0000000)
.comm memory_map_read 0x8000
.comm memory_map_write 0x8000
.data
base_reg_area:
.space 0x100, 0