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[x86] Move reg_cycles to EBP, for better compatiblity

This commit is contained in:
David Guillen Fandos 2021-11-02 20:11:46 +01:00
parent 15cc02e03c
commit 4d0d8dc42d
2 changed files with 8 additions and 7 deletions
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6
x86/x86_emit.h
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@ -393,13 +393,13 @@ typedef enum
#define x86_emit_jmp_reg(source) \
x86_emit_opcode_1b_ext_reg(jmp_reg, source) \
#define reg_base ebx
#define reg_cycles edi
#define reg_base ebx // Saved register
#define reg_cycles ebp // Saved register
#define reg_a0 eax
#define reg_a1 edx
#define reg_a2 ecx
#define reg_rv eax
#define reg_s0 esi
#define reg_s0 esi // Any saved register
/* Offsets from reg_base, see stub.S */
#define SPSR_BASE_OFF 0xA9100

9
x86/x86_stub.S
View File

@ -76,6 +76,8 @@ _##symbol:
.equ IORAM_OFF, 0xA8D00
.equ SPSR_OFF, 0xA9100
#define REG_CYCLES %ebp
# destroys ecx and edx
.macro collapse_flag offset, shift
@ -129,7 +131,7 @@ defsymbl(x86_update_gba)
call _update_gba # process the next event
mov %eax, %edi # edi = new cycle count
mov %eax, REG_CYCLES # new cycle count
# did we just complete a frame? go back to main then
cmpl $0, COMPLETED_FRAME(%ebx)
@ -145,7 +147,6 @@ defsymbl(x86_update_gba)
# for BX and data processing to PC with the S bit set.
# eax: GBA address to branch to
# edi: Cycle counter
defsymbl(x86_indirect_branch_arm)
call _block_lookup_address_arm
@ -193,7 +194,7 @@ alert_loop:
cmp $0, %edx # 0 means it has
jnz alert_loop # if not go again
mov %eax, %edi # edi = new cycle count
mov %eax, REG_CYCLES # load new cycle count
jmp lookup_pc # pc has definitely changed
no_alert:
@ -445,7 +446,7 @@ defsymbl(execute_arm_translate_internal)
movl %edx, %ebx # load base register (arg1)
extract_flags # load flag variables
movl %eax, %edi # load edi cycle counter (arg0)
movl %eax, REG_CYCLES # load cycle counter (arg0)
movl REG_PC(%ebx), %eax # load PC