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Date: Mon, 25 Jan 2016 13:20:52 +0100
From: Felix Fietkau <nbd@...nwrt.org>
To: musl@...ts.openwall.com
Subject: [PATCH v3] Add PowerPC soft-float support
Some PowerPC CPUs (e.g. Freescale MPC85xx) have a completely different
instruction set for floating point operations (SPE).
Executing regular PowerPC floating point instructions results in
"Illegal instruction" errors.
Make it possible to run these devices in soft-float mode.
Signed-off-by: Felix Fietkau <nbd@...nwrt.org>
---
arch/powerpc/bits/fenv.h | 5 ++
arch/powerpc/reloc.h | 8 ++-
configure | 4 ++
src/fenv/powerpc/fenv-sf.c | 3 +
src/fenv/powerpc/fenv.S | 129 +++++++++++++++++++++++++++++++++++++++++++
src/fenv/powerpc/fenv.s | 123 -----------------------------------------
src/setjmp/powerpc/longjmp.S | 69 +++++++++++++++++++++++
src/setjmp/powerpc/longjmp.s | 65 ----------------------
src/setjmp/powerpc/setjmp.S | 63 +++++++++++++++++++++
src/setjmp/powerpc/setjmp.s | 61 --------------------
10 files changed, 280 insertions(+), 250 deletions(-)
create mode 100644 src/fenv/powerpc/fenv-sf.c
create mode 100644 src/fenv/powerpc/fenv.S
delete mode 100644 src/fenv/powerpc/fenv.s
create mode 100644 src/setjmp/powerpc/longjmp.S
delete mode 100644 src/setjmp/powerpc/longjmp.s
create mode 100644 src/setjmp/powerpc/setjmp.S
delete mode 100644 src/setjmp/powerpc/setjmp.s
diff --git a/arch/powerpc/bits/fenv.h b/arch/powerpc/bits/fenv.h
index 2f722e6..c5a3e5c 100644
--- a/arch/powerpc/bits/fenv.h
+++ b/arch/powerpc/bits/fenv.h
@@ -1,3 +1,7 @@
+#ifdef _SOFT_FLOAT
+#define FE_ALL_EXCEPT 0
+#define FE_TONEAREST 0
+#else
#define FE_TONEAREST 0
#define FE_TOWARDZERO 1
#define FE_UPWARD 2
@@ -24,6 +28,7 @@
#define FE_ALL_INVALID 0x01f80700
#endif
+#endif
typedef unsigned fexcept_t;
typedef double fenv_t;
diff --git a/arch/powerpc/reloc.h b/arch/powerpc/reloc.h
index b8b6589..1b4cab3 100644
--- a/arch/powerpc/reloc.h
+++ b/arch/powerpc/reloc.h
@@ -1,4 +1,10 @@
-#define LDSO_ARCH "powerpc"
+#ifdef _SOFT_FLOAT
+#define FP_SUFFIX "-sf"
+#else
+#define FP_SUFFIX ""
+#endif
+
+#define LDSO_ARCH "powerpc" FP_SUFFIX
#define TPOFF_K (-0x7000)
diff --git a/configure b/configure
index 5b97f71..e173b3d 100755
--- a/configure
+++ b/configure
@@ -595,6 +595,10 @@ trycppif "_MIPSEL || __MIPSEL || __MIPSEL__" "$t" && SUBARCH=${SUBARCH}el
trycppif __mips_soft_float "$t" && SUBARCH=${SUBARCH}-sf
fi
+if test "$ARCH" = "powerpc" ; then
+trycppif _SOFT_FLOAT "$t" && SUBARCH=${SUBARCH}-sf
+fi
+
test "$ARCH" = "microblaze" && trycppif __MICROBLAZEEL__ "$t" \
&& SUBARCH=${SUBARCH}el
diff --git a/src/fenv/powerpc/fenv-sf.c b/src/fenv/powerpc/fenv-sf.c
new file mode 100644
index 0000000..85bef40
--- /dev/null
+++ b/src/fenv/powerpc/fenv-sf.c
@@ -0,0 +1,3 @@
+#ifdef _SOFT_FLOAT
+#include "../fenv.c"
+#endif
diff --git a/src/fenv/powerpc/fenv.S b/src/fenv/powerpc/fenv.S
new file mode 100644
index 0000000..1516eb5
--- /dev/null
+++ b/src/fenv/powerpc/fenv.S
@@ -0,0 +1,129 @@
+#ifndef _SOFT_FLOAT
+.global feclearexcept
+.type feclearexcept,@function
+feclearexcept:
+ andis. 3,3,0x3e00
+ /* if (r3 & FE_INVALID) r3 |= all_invalid_flags */
+ andis. 0,3,0x2000
+ stwu 1,-16(1)
+ beq- 0,1f
+ oris 3,3,0x01f8
+ ori 3,3,0x0700
+1:
+ /*
+ * note: fpscr contains various fpu status and control
+ * flags and we dont check if r3 may alter other flags
+ * than the exception related ones
+ * ufpscr &= ~r3
+ */
+ mffs 0
+ stfd 0,8(1)
+ lwz 9,12(1)
+ andc 9,9,3
+ stw 9,12(1)
+ lfd 0,8(1)
+ mtfsf 255,0
+
+ /* return 0 */
+ li 3,0
+ addi 1,1,16
+ blr
+
+.global feraiseexcept
+.type feraiseexcept,@function
+feraiseexcept:
+ andis. 3,3,0x3e00
+ /* if (r3 & FE_INVALID) r3 |= software_invalid_flag */
+ andis. 0,3,0x2000
+ stwu 1,-16(1)
+ beq- 0,1f
+ ori 3,3,0x0400
+1:
+ /* fpscr |= r3 */
+ mffs 0
+ stfd 0,8(1)
+ lwz 9,12(1)
+ or 9,9,3
+ stw 9,12(1)
+ lfd 0,8(1)
+ mtfsf 255,0
+
+ /* return 0 */
+ li 3,0
+ addi 1,1,16
+ blr
+
+.global fetestexcept
+.type fetestexcept,@function
+fetestexcept:
+ andis. 3,3,0x3e00
+ /* return r3 & fpscr */
+ stwu 1,-16(1)
+ mffs 0
+ stfd 0,8(1)
+ lwz 9,12(1)
+ addi 1,1,16
+ and 3,3,9
+ blr
+
+.global fegetround
+.type fegetround,@function
+fegetround:
+ /* return fpscr & 3 */
+ stwu 1,-16(1)
+ mffs 0
+ stfd 0,8(1)
+ lwz 3,12(1)
+ addi 1,1,16
+ clrlwi 3,3,30
+ blr
+
+.global __fesetround
+.type __fesetround,@function
+__fesetround:
+ /*
+ * note: invalid input is not checked, r3 < 4 must hold
+ * fpscr = (fpscr & -4U) | r3
+ */
+ stwu 1,-16(1)
+ mffs 0
+ stfd 0,8(1)
+ lwz 9,12(1)
+ clrrwi 9,9,2
+ or 9,9,3
+ stw 9,12(1)
+ lfd 0,8(1)
+ mtfsf 255,0
+
+ /* return 0 */
+ li 3,0
+ addi 1,1,16
+ blr
+
+.global fegetenv
+.type fegetenv,@function
+fegetenv:
+ /* *r3 = fpscr */
+ mffs 0
+ stfd 0,0(3)
+ /* return 0 */
+ li 3,0
+ blr
+
+.global fesetenv
+.type fesetenv,@function
+fesetenv:
+ cmpwi 3, -1
+ bne 1f
+ mflr 4
+ bl 2f
+ .zero 8
+2: mflr 3
+ mtlr 4
+1: /* fpscr = *r3 */
+ lfd 0,0(3)
+ mtfsf 255,0
+ /* return 0 */
+ li 3,0
+ blr
+#endif
diff --git a/src/fenv/powerpc/fenv.s b/src/fenv/powerpc/fenv.s
deleted file mode 100644
index e34a999..0000000
--- a/src/fenv/powerpc/fenv.s
+++ /dev/null
@@ -1,123 +0,0 @@
-.global feclearexcept
-.type feclearexcept,@function
-feclearexcept:
- andis. 3,3,0x3e00
- # if (r3 & FE_INVALID) r3 |= all_invalid_flags
- andis. 0,3,0x2000
- stwu 1,-16(1)
- beq- 0,1f
- oris 3,3,0x01f8
- ori 3,3,0x0700
-1:
- # note: fpscr contains various fpu status and control
- # flags and we dont check if r3 may alter other flags
- # than the exception related ones
- # fpscr &= ~r3
- mffs 0
- stfd 0,8(1)
- lwz 9,12(1)
- andc 9,9,3
- stw 9,12(1)
- lfd 0,8(1)
- mtfsf 255,0
-
- # return 0
- li 3,0
- addi 1,1,16
- blr
-
-.global feraiseexcept
-.type feraiseexcept,@function
-feraiseexcept:
- andis. 3,3,0x3e00
- # if (r3 & FE_INVALID) r3 |= software_invalid_flag
- andis. 0,3,0x2000
- stwu 1,-16(1)
- beq- 0,1f
- ori 3,3,0x0400
-1:
- # fpscr |= r3
- mffs 0
- stfd 0,8(1)
- lwz 9,12(1)
- or 9,9,3
- stw 9,12(1)
- lfd 0,8(1)
- mtfsf 255,0
-
- # return 0
- li 3,0
- addi 1,1,16
- blr
-
-.global fetestexcept
-.type fetestexcept,@function
-fetestexcept:
- andis. 3,3,0x3e00
- # return r3 & fpscr
- stwu 1,-16(1)
- mffs 0
- stfd 0,8(1)
- lwz 9,12(1)
- addi 1,1,16
- and 3,3,9
- blr
-
-.global fegetround
-.type fegetround,@function
-fegetround:
- # return fpscr & 3
- stwu 1,-16(1)
- mffs 0
- stfd 0,8(1)
- lwz 3,12(1)
- addi 1,1,16
- clrlwi 3,3,30
- blr
-
-.global __fesetround
-.type __fesetround,@function
-__fesetround:
- # note: invalid input is not checked, r3 < 4 must hold
- # fpscr = (fpscr & -4U) | r3
- stwu 1,-16(1)
- mffs 0
- stfd 0,8(1)
- lwz 9,12(1)
- clrrwi 9,9,2
- or 9,9,3
- stw 9,12(1)
- lfd 0,8(1)
- mtfsf 255,0
-
- # return 0
- li 3,0
- addi 1,1,16
- blr
-
-.global fegetenv
-.type fegetenv,@function
-fegetenv:
- # *r3 = fpscr
- mffs 0
- stfd 0,0(3)
- # return 0
- li 3,0
- blr
-
-.global fesetenv
-.type fesetenv,@function
-fesetenv:
- cmpwi 3, -1
- bne 1f
- mflr 4
- bl 2f
- .zero 8
-2: mflr 3
- mtlr 4
-1: # fpscr = *r3
- lfd 0,0(3)
- mtfsf 255,0
- # return 0
- li 3,0
- blr
diff --git a/src/setjmp/powerpc/longjmp.S b/src/setjmp/powerpc/longjmp.S
new file mode 100644
index 0000000..e598bd0
--- /dev/null
+++ b/src/setjmp/powerpc/longjmp.S
@@ -0,0 +1,69 @@
+ .global _longjmp
+ .global longjmp
+ .type _longjmp,@function
+ .type longjmp,@function
+_longjmp:
+longjmp:
+ /*
+ * void longjmp(jmp_buf env, int val);
+ * put val into return register and restore the env saved in setjmp
+ * if val(r4) is 0, put 1 there.
+ */
+ /* 0) move old return address into r0 */
+ lwz 0, 0(3)
+ /* 1) put it into link reg */
+ mtlr 0
+ /* 2 ) restore stack ptr */
+ lwz 1, 4(3)
+ /* 3) restore control reg */
+ lwz 0, 8(3)
+ mtcr 0
+ /* 4) restore r14-r31 */
+ lwz 14, 12(3)
+ lwz 15, 16(3)
+ lwz 16, 20(3)
+ lwz 17, 24(3)
+ lwz 18, 28(3)
+ lwz 19, 32(3)
+ lwz 20, 36(3)
+ lwz 21, 40(3)
+ lwz 22, 44(3)
+ lwz 23, 48(3)
+ lwz 24, 52(3)
+ lwz 25, 56(3)
+ lwz 26, 60(3)
+ lwz 27, 64(3)
+ lwz 28, 68(3)
+ lwz 29, 72(3)
+ lwz 30, 76(3)
+ lwz 31, 80(3)
+#ifndef _SOFT_FLOAT
+ lfd 14,88(3)
+ lfd 15,96(3)
+ lfd 16,104(3)
+ lfd 17,112(3)
+ lfd 18,120(3)
+ lfd 19,128(3)
+ lfd 20,136(3)
+ lfd 21,144(3)
+ lfd 22,152(3)
+ lfd 23,160(3)
+ lfd 24,168(3)
+ lfd 25,176(3)
+ lfd 26,184(3)
+ lfd 27,192(3)
+ lfd 28,200(3)
+ lfd 29,208(3)
+ lfd 30,216(3)
+ lfd 31,224(3)
+#endif
+ /* 5) put val into return reg r3 */
+ mr 3, 4
+
+ /* 6) check if return value is 0, make it 1 in that case */
+ cmpwi cr7, 4, 0
+ bne cr7, 1f
+ li 3, 1
+1:
+ blr
+
diff --git a/src/setjmp/powerpc/longjmp.s b/src/setjmp/powerpc/longjmp.s
deleted file mode 100644
index bab1751..0000000
--- a/src/setjmp/powerpc/longjmp.s
+++ /dev/null
@@ -1,65 +0,0 @@
- .global _longjmp
- .global longjmp
- .type _longjmp,@function
- .type longjmp,@function
-_longjmp:
-longjmp:
-# void longjmp(jmp_buf env, int val);
-# put val into return register and restore the env saved in setjmp
-# if val(r4) is 0, put 1 there.
- # 0) move old return address into r0
- lwz 0, 0(3)
- # 1) put it into link reg
- mtlr 0
- #2 ) restore stack ptr
- lwz 1, 4(3)
- #3) restore control reg
- lwz 0, 8(3)
- mtcr 0
- #4) restore r14-r31
- lwz 14, 12(3)
- lwz 15, 16(3)
- lwz 16, 20(3)
- lwz 17, 24(3)
- lwz 18, 28(3)
- lwz 19, 32(3)
- lwz 20, 36(3)
- lwz 21, 40(3)
- lwz 22, 44(3)
- lwz 23, 48(3)
- lwz 24, 52(3)
- lwz 25, 56(3)
- lwz 26, 60(3)
- lwz 27, 64(3)
- lwz 28, 68(3)
- lwz 29, 72(3)
- lwz 30, 76(3)
- lwz 31, 80(3)
- lfd 14,88(3)
- lfd 15,96(3)
- lfd 16,104(3)
- lfd 17,112(3)
- lfd 18,120(3)
- lfd 19,128(3)
- lfd 20,136(3)
- lfd 21,144(3)
- lfd 22,152(3)
- lfd 23,160(3)
- lfd 24,168(3)
- lfd 25,176(3)
- lfd 26,184(3)
- lfd 27,192(3)
- lfd 28,200(3)
- lfd 29,208(3)
- lfd 30,216(3)
- lfd 31,224(3)
- #5) put val into return reg r3
- mr 3, 4
-
- #6) check if return value is 0, make it 1 in that case
- cmpwi cr7, 4, 0
- bne cr7, 1f
- li 3, 1
-1:
- blr
-
diff --git a/src/setjmp/powerpc/setjmp.S b/src/setjmp/powerpc/setjmp.S
new file mode 100644
index 0000000..cd91a20
--- /dev/null
+++ b/src/setjmp/powerpc/setjmp.S
@@ -0,0 +1,63 @@
+ .global ___setjmp
+ .hidden ___setjmp
+ .global __setjmp
+ .global _setjmp
+ .global setjmp
+ .type __setjmp,@function
+ .type _setjmp,@function
+ .type setjmp,@function
+___setjmp:
+__setjmp:
+_setjmp:
+setjmp:
+ /* 0) store IP int 0, then into the jmpbuf pointed to by r3 (first arg) */
+ mflr 0
+ stw 0, 0(3)
+ /* 1) store reg1 (SP) */
+ stw 1, 4(3)
+ /* 2) store cr */
+ mfcr 0
+ stw 0, 8(3)
+ /* 3) store r14-31 */
+ stw 14, 12(3)
+ stw 15, 16(3)
+ stw 16, 20(3)
+ stw 17, 24(3)
+ stw 18, 28(3)
+ stw 19, 32(3)
+ stw 20, 36(3)
+ stw 21, 40(3)
+ stw 22, 44(3)
+ stw 23, 48(3)
+ stw 24, 52(3)
+ stw 25, 56(3)
+ stw 26, 60(3)
+ stw 27, 64(3)
+ stw 28, 68(3)
+ stw 29, 72(3)
+ stw 30, 76(3)
+ stw 31, 80(3)
+#ifndef _SOFT_FLOAT
+ stfd 14,88(3)
+ stfd 15,96(3)
+ stfd 16,104(3)
+ stfd 17,112(3)
+ stfd 18,120(3)
+ stfd 19,128(3)
+ stfd 20,136(3)
+ stfd 21,144(3)
+ stfd 22,152(3)
+ stfd 23,160(3)
+ stfd 24,168(3)
+ stfd 25,176(3)
+ stfd 26,184(3)
+ stfd 27,192(3)
+ stfd 28,200(3)
+ stfd 29,208(3)
+ stfd 30,216(3)
+ stfd 31,224(3)
+#endif
+ /* 4) set return value to 0 */
+ li 3, 0
+ /* 5) return */
+ blr
diff --git a/src/setjmp/powerpc/setjmp.s b/src/setjmp/powerpc/setjmp.s
deleted file mode 100644
index 122177f..0000000
--- a/src/setjmp/powerpc/setjmp.s
+++ /dev/null
@@ -1,61 +0,0 @@
- .global ___setjmp
- .hidden ___setjmp
- .global __setjmp
- .global _setjmp
- .global setjmp
- .type __setjmp,@function
- .type _setjmp,@function
- .type setjmp,@function
-___setjmp:
-__setjmp:
-_setjmp:
-setjmp:
- # 0) store IP int 0, then into the jmpbuf pointed to by r3 (first arg)
- mflr 0
- stw 0, 0(3)
- # 1) store reg1 (SP)
- stw 1, 4(3)
- # 2) store cr
- mfcr 0
- stw 0, 8(3)
- # 3) store r14-31
- stw 14, 12(3)
- stw 15, 16(3)
- stw 16, 20(3)
- stw 17, 24(3)
- stw 18, 28(3)
- stw 19, 32(3)
- stw 20, 36(3)
- stw 21, 40(3)
- stw 22, 44(3)
- stw 23, 48(3)
- stw 24, 52(3)
- stw 25, 56(3)
- stw 26, 60(3)
- stw 27, 64(3)
- stw 28, 68(3)
- stw 29, 72(3)
- stw 30, 76(3)
- stw 31, 80(3)
- stfd 14,88(3)
- stfd 15,96(3)
- stfd 16,104(3)
- stfd 17,112(3)
- stfd 18,120(3)
- stfd 19,128(3)
- stfd 20,136(3)
- stfd 21,144(3)
- stfd 22,152(3)
- stfd 23,160(3)
- stfd 24,168(3)
- stfd 25,176(3)
- stfd 26,184(3)
- stfd 27,192(3)
- stfd 28,200(3)
- stfd 29,208(3)
- stfd 30,216(3)
- stfd 31,224(3)
- # 4) set return value to 0
- li 3, 0
- # 5) return
- blr
--
2.2.2
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