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arch/arm: only compare callee-saved registers for fpu

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Registers S0-S15 (D0-D7, Q0-Q3) do not need to be preserved. They can be used for passing
arguments or returning results in standard procedure-call variants.
Registers D16-D31 (Q8-Q15), do not need to be preserved.

Signed-off-by: zhangyuan21 <zhangyuan21@xiaomi.com>
This commit is contained in:
zhangyuan21 2022-12-08 19:43:18 +08:00 committed by Xiang Xiao
parent 6711b37662
commit ffd2eb5b14
5 changed files with 36 additions and 9 deletions
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8
arch/arm/src/armv7-a/arm_fpucmp.c
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@ -36,6 +36,8 @@
#ifdef CONFIG_ARCH_FPU
# define FPU_CALLEE_REGS (16)
/****************************************************************************
* Public Functions
****************************************************************************/
@ -60,6 +62,10 @@ bool up_fpucmp(const void *saveregs1, const void *saveregs2)
const uint32_t *regs1 = saveregs1;
const uint32_t *regs2 = saveregs2;
return memcmp(&regs1[REG_S0], &regs2[REG_S0], 4 * FPU_CONTEXT_REGS) == 0;
/* Only compare callee-saved registers, caller-saved registers do not
* need to be preserved.
*/
return memcmp(&regs1[REG_S16], &regs2[REG_S16], 4 * FPU_CALLEE_REGS) == 0;
}
#endif /* CONFIG_ARCH_FPU */

8
arch/arm/src/armv7-m/arm_fpucmp.c
View File

@ -60,10 +60,12 @@ bool up_fpucmp(const void *saveregs1, const void *saveregs2)
const uint32_t *regs1 = saveregs1;
const uint32_t *regs2 = saveregs2;
/* Only compare callee-saved registers, caller-saved registers do not
* need to be preserved.
*/
/* compare of hardware fp registers should skip REG_FP_RESERVED */
return memcmp(&regs1[REG_S0], &regs2[REG_S0],
4 * (HW_FPU_REGS - 1)) == 0 &&
memcmp(&regs1[REG_S16], &regs2[REG_S16], 4 * SW_FPU_REGS) == 0;
return memcmp(&regs1[REG_S16], &regs2[REG_S16], 4 * SW_FPU_REGS) == 0;
}
#endif /* CONFIG_ARCH_FPU */

8
arch/arm/src/armv7-r/arm_fpucmp.c
View File

@ -36,6 +36,8 @@
#ifdef CONFIG_ARCH_FPU
# define FPU_CALLEE_REGS (16)
/****************************************************************************
* Public Functions
****************************************************************************/
@ -60,6 +62,10 @@ bool up_fpucmp(const void *saveregs1, const void *saveregs2)
const uint32_t *regs1 = saveregs1;
const uint32_t *regs2 = saveregs2;
return memcmp(&regs1[REG_S0], &regs2[REG_S0], 4 * FPU_CONTEXT_REGS) == 0;
/* Only compare callee-saved registers, caller-saved registers do not
* need to be preserved.
*/
return memcmp(&regs1[REG_S16], &regs2[REG_S16], 4 * FPU_CALLEE_REGS) == 0;
}
#endif /* CONFIG_ARCH_FPU */

8
arch/arm/src/armv8-m/arm_fpucmp.c
View File

@ -60,10 +60,12 @@ bool up_fpucmp(const void *saveregs1, const void *saveregs2)
const uint32_t *regs1 = saveregs1;
const uint32_t *regs2 = saveregs2;
/* Only compare callee-saved registers, caller-saved registers do not
* need to be preserved.
*/
/* compare of hardware fp registers should skip REG_FP_RESERVED */
return memcmp(&regs1[REG_S0], &regs2[REG_S0],
4 * (HW_FPU_REGS - 1)) == 0 &&
memcmp(&regs1[REG_S16], &regs2[REG_S16], 4 * SW_FPU_REGS) == 0;
return memcmp(&regs1[REG_S16], &regs2[REG_S16], 4 * SW_FPU_REGS) == 0;
}
#endif /* CONFIG_ARCH_FPU */

13
arch/arm64/src/common/arm64_fpu.c
View File

@ -41,6 +41,12 @@
#include "arm64_fatal.h"
#include "arm64_fpu.h"
/***************************************************************************
* Pre-processor Definitions
***************************************************************************/
#define FPU_CALLEE_REGS (8)
/***************************************************************************
* Private Data
***************************************************************************/
@ -245,5 +251,10 @@ bool up_fpucmp(const void *saveregs1, const void *saveregs2)
const uint64_t *regs1 = saveregs1 + XCPTCONTEXT_GP_SIZE;
const uint64_t *regs2 = saveregs2 + XCPTCONTEXT_GP_SIZE;
return memcmp(regs1, regs2, 8 * XCPTCONTEXT_FPU_REGS) == 0;
/* Only compare callee-saved registers, caller-saved registers do not
* need to be preserved.
*/
return memcmp(&regs1[FPU_REG_Q4], &regs2[FPU_REG_Q4],
8 * FPU_CALLEE_REGS) == 0;
}