lifning
/
gpsp
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Merge pull request #98 from davidgfnet/master 

ARM dynarec: Do not use the stack at all
This commit is contained in:
Autechre 2021-03-05 18:27:13 +01:00 committed by GitHub
parent fa45d3701a d21478e06e
commit cbcb5df7da
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 15 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
arm/arm_stub.S
View File

@ -40,6 +40,8 @@
#define CPU_HALT_STATE (30 * 4) #define CPU_HALT_STATE (30 * 4)
#define CHANGED_PC_STATUS (31 * 4) #define CHANGED_PC_STATUS (31 * 4)
#define REG_HOST_SP (32 * 4)
#define reg_a0 r0 #define reg_a0 r0
#define reg_a1 r1 #define reg_a1 r1
@ -141,13 +143,15 @@
@ Align the stack to 64 bits (ABIs that don't require it, still recommend so) @ Align the stack to 64 bits (ABIs that don't require it, still recommend so)
#define call_c_saved_regs r2, r3, r12, lr #define call_c_saved_regs r2, r3, r12, lr
@ Calls a C function - all caller save registers which are important to the @ Calls a C function - reloads the stack pointer and saves all caller save
@ dynarec and to returning from this function are saved. @ registers which are important to the dynarec.
#define call_c_function(function) ;\ #define call_c_function(function) ;\
ldr sp, [reg_base, #REG_HOST_SP] ;\
stmdb sp!, { call_c_saved_regs } ;\ stmdb sp!, { call_c_saved_regs } ;\
bl function ;\ bl function ;\
ldmia sp!, { call_c_saved_regs } ;\ ldmia sp!, { call_c_saved_regs } ;\
ldr sp, =base_reg_area ;\
@ Update the GBA hardware (video, sound, input, etc) @ Update the GBA hardware (video, sound, input, etc)
@ -475,7 +479,9 @@ execute_swi_function_builder(div, thumb)
.globl _execute_arm_translate .globl _execute_arm_translate
execute_arm_translate: 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 mvn reg_cycles, r0 @ load cycle counter
@ -603,7 +609,7 @@ write_epilogue:
store_registers_arm() @ save ARM registers store_registers_arm() @ save ARM registers
3: 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 mvn reg_cycles, r0 @ load new cycle count
ldr r0, [reg_base, #REG_PC] @ load new PC 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_read 0x8000
.comm memory_map_write 0x8000 .comm memory_map_write 0x8000
.data
base_reg_area:
.space 0x100, 0