diff options
| author | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2022-01-10 11:00:59 +0300 |
|---|---|---|
| committer | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2022-01-11 11:15:03 +0300 |
| commit | ebe756e466883b3c04d7973b47420f778345cb50 (patch) | |
| tree | d108eaeca61494ba3f16e114ef7182d36043b4a2 /newlib | |
| parent | 7f8fa1de4fd35c96b61d2f80155bc1aa09367e3d (diff) | |
powerpc/setjmp: Improve RTEMS support
For some RTEMS multilibs, the FPU and Altivec units are disabled during
interrupt handling. Do not save and restore the corresponding registers in
this case.
Diffstat (limited to 'newlib')
| -rw-r--r-- | newlib/libc/machine/powerpc/setjmp.S | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/newlib/libc/machine/powerpc/setjmp.S b/newlib/libc/machine/powerpc/setjmp.S index f327f31da..f4ccd1bb5 100644 --- a/newlib/libc/machine/powerpc/setjmp.S +++ b/newlib/libc/machine/powerpc/setjmp.S @@ -78,6 +78,14 @@ FUNC_START(setjmp) on its own would be enough for GCC 4.1 and above, but older compilers only define _SOFT_FLOAT, so check both. */ #if !defined (__NO_FPRS__) && !defined (_SOFT_FLOAT) +#if defined (__rtems__) && !defined (__PPC_CPU_E6500__) + /* For some RTEMS multilibs, the FPU and Altivec units are disabled + during interrupt handling. Do not save and restore the + corresponding registers in this case. */ + mfmsr 5 + andi. 5,5,0x2000 + beq 1f +#endif stfdu 14,8(3) # offset 96 stfdu 15,8(3) # offset 104 stfdu 16,8(3) # offset 112 @@ -96,12 +104,18 @@ FUNC_START(setjmp) stfdu 29,8(3) # offset 216 stfdu 30,8(3) # offset 224 stfdu 31,8(3) # offset 232 +1: #endif /* This requires a total of 21 * 4 + 18 * 8 + 4 + 4 + 4 bytes == 60 * 4 bytes == 240 bytes. */ #ifdef __ALTIVEC__ +#if defined (__rtems__) && !defined (__PPC_CPU_E6500__) + mfmsr 5 + andis. 5,5,0x200 + beq 1f +#endif /* save Altivec vrsave and vr20-vr31 registers */ mfspr 4,256 # vrsave register stwu 4,16(3) # offset 248 @@ -129,6 +143,7 @@ FUNC_START(setjmp) stvx 30,0,3 # offset 416 addi 3,3,16 stvx 31,0,3 # offset 432 +1: /* This requires a total of 240 + 8 + 8 + 12 * 16 == 448 bytes. */ #endif @@ -211,6 +226,11 @@ FUNC_START(longjmp) above, but older compilers only define _SOFT_FLOAT, so check both. */ #if !defined (__NO_FPRS__) && !defined (_SOFT_FLOAT) +#if defined (__rtems__) && !defined (__PPC_CPU_E6500__) + mfmsr 5 + andi. 5,5,0x2000 + beq 1f +#endif lfdu 14,8(3) # offset 96 lfdu 15,8(3) # offset 104 lfdu 16,8(3) # offset 112 @@ -229,9 +249,15 @@ FUNC_START(longjmp) lfdu 29,8(3) # offset 216 lfdu 30,8(3) # offset 224 lfdu 31,8(3) # offset 232 +1: #endif #ifdef __ALTIVEC__ +#if defined (__rtems__) && !defined (__PPC_CPU_E6500__) + mfmsr 5 + andis. 5,5,0x200 + beq 1f +#endif /* restore Altivec vrsave and v20-v31 registers */ lwzu 5,16(3) # offset 248 mtspr 256,5 # vrsave @@ -259,6 +285,7 @@ FUNC_START(longjmp) lvx 30,0,3 # offset 416 addi 3,3,16 lvx 31,0,3 # offset 432 +1: #endif mr. 3,4 |