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| author | neonloop | 2021-07-03 20:17:38 +0000 |
|---|---|---|
| committer | neonloop | 2021-07-03 20:17:38 +0000 |
| commit | 0398338eac60a820bd636c23af34fa76f047681a (patch) | |
| tree | 2180bd5c52f600b3e98ca352aedbf230fe44fa27 /arm | |
| parent | 2815c248d76932787fb58d5bbaa0f26be7bcb2be (diff) | |
| download | picogpsp-0398338eac60a820bd636c23af34fa76f047681a.tar.gz picogpsp-0398338eac60a820bd636c23af34fa76f047681a.tar.bz2 picogpsp-0398338eac60a820bd636c23af34fa76f047681a.zip | |
Restores extract/extend functions for old ARM devices
Diffstat (limited to 'arm')
| -rw-r--r-- | arm/arm_stub.S | 29 |
1 files changed, 23 insertions, 6 deletions
diff --git a/arm/arm_stub.S b/arm/arm_stub.S index 848d311..4d7e22b 100644 --- a/arm/arm_stub.S +++ b/arm/arm_stub.S @@ -67,8 +67,14 @@ _##symbol: #define MODE_SUPERVISOR 3 -#define extract_u16(rd, rs) \ - uxth rd, rs +#if __ARM_ARCH >= 6 + #define extract_u16(rd, rs) \ + uxth rd, rs +#else + #define extract_u16(rd, rs) \ + bic rd, rs, #0xff000000 ;\ + bic rd, rd, #0x00ff0000 +#endif @ Will load the register set from memory into the appropriate cached registers. @ See arm_emit.h for listing explanation. @@ -772,11 +778,22 @@ lookup_pc: #define sign_extend_u16(reg) #define sign_extend_u32(reg) -#define sign_extend_s8(reg) ;\ - sxtb reg, reg +#if __ARM_ARCH >= 6 + #define sign_extend_s8(reg) ;\ + sxtb reg, reg + + #define sign_extend_s16(reg) ;\ + sxth reg, reg +#else + #define sign_extend_s8(reg) ;\ + mov reg, reg, lsl #24 /* shift reg into upper 8bits */;\ + mov reg, reg, asr #24 /* shift down, sign extending */;\ + + #define sign_extend_s16(reg) ;\ + mov reg, reg, lsl #16 /* shift reg into upper 16bits */;\ + mov reg, reg, asr #16 /* shift down, sign extending */;\ -#define sign_extend_s16(reg) ;\ - sxth reg, reg +#endif #define execute_load_op_u8(load_op) ;\ mov r0, r0, lsl #17 ;\ |