142 lines
3 KiB
Diff
142 lines
3 KiB
Diff
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From: Felix Fietkau <nbd@openwrt.org>
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Date: Wed, 8 Jul 2015 13:56:37 +0200
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Subject: [PATCH] Add PowerPC soft-float support
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Some PowerPC CPUs (e.g. Freescale MPC85xx) have a completely different
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instruction set for floating point operations (SPE).
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Executing regular PowerPC floating point instructions results in
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"Illegal instruction" errors.
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Until support for SPE FPU is added, make it possible to run these
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devices in soft-float mode.
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Signed-off-by: Felix Fietkau <nbd@openwrt.org>
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---
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create mode 100644 src/fenv/powerpc-sf/fenv.sub
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create mode 100644 src/setjmp/powerpc-sf/longjmp.s
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create mode 100644 src/setjmp/powerpc-sf/longjmp.sub
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create mode 100644 src/setjmp/powerpc-sf/setjmp.s
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create mode 100644 src/setjmp/powerpc-sf/setjmp.sub
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--- a/configure
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+++ b/configure
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@@ -498,6 +498,10 @@ trycppif "_MIPSEL || __MIPSEL || __MIPSE
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trycppif __mips_soft_float "$t" && SUBARCH=${SUBARCH}-sf
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fi
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+if test "$ARCH" = "powerpc" ; then
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+trycppif _SOFT_FLOAT "$t" && SUBARCH=${SUBARCH}-sf
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+fi
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+
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test "$ARCH" = "microblaze" && trycppif __MICROBLAZEEL__ "$t" \
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&& SUBARCH=${SUBARCH}el
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--- /dev/null
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+++ b/src/fenv/powerpc-sf/fenv.sub
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@@ -0,0 +1 @@
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+../fenv.c
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--- /dev/null
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+++ b/src/setjmp/powerpc-sf/longjmp.s
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@@ -0,0 +1,47 @@
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+ .global _longjmp
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+ .global longjmp
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+ .type _longjmp,@function
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+ .type longjmp,@function
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+_longjmp:
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+longjmp:
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+# void longjmp(jmp_buf env, int val);
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+# put val into return register and restore the env saved in setjmp
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+# if val(r4) is 0, put 1 there.
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+ # 0) move old return address into r0
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+ lwz 0, 0(3)
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+ # 1) put it into link reg
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+ mtlr 0
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+ #2 ) restore stack ptr
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+ lwz 1, 4(3)
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+ #3) restore control reg
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+ lwz 0, 8(3)
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+ mtcr 0
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+ #4) restore r14-r31
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+ lwz 14, 12(3)
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+ lwz 15, 16(3)
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+ lwz 16, 20(3)
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+ lwz 17, 24(3)
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+ lwz 18, 28(3)
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+ lwz 19, 32(3)
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+ lwz 20, 36(3)
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+ lwz 21, 40(3)
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+ lwz 22, 44(3)
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+ lwz 23, 48(3)
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+ lwz 24, 52(3)
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+ lwz 25, 56(3)
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+ lwz 26, 60(3)
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+ lwz 27, 64(3)
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+ lwz 28, 68(3)
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+ lwz 29, 72(3)
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+ lwz 30, 76(3)
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+ lwz 31, 80(3)
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+ #5) put val into return reg r3
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+ mr 3, 4
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+
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+ #6) check if return value is 0, make it 1 in that case
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+ cmpwi cr7, 4, 0
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+ bne cr7, 1f
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+ li 3, 1
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+1:
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+ blr
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+
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--- /dev/null
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+++ b/src/setjmp/powerpc-sf/longjmp.sub
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@@ -0,0 +1 @@
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+longjmp.s
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--- /dev/null
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+++ b/src/setjmp/powerpc-sf/setjmp.s
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@@ -0,0 +1,43 @@
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+ .global ___setjmp
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+ .hidden ___setjmp
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+ .global __setjmp
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+ .global _setjmp
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+ .global setjmp
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+ .type __setjmp,@function
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+ .type _setjmp,@function
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+ .type setjmp,@function
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+___setjmp:
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+__setjmp:
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+_setjmp:
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+setjmp:
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+ # 0) store IP int 0, then into the jmpbuf pointed to by r3 (first arg)
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+ mflr 0
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+ stw 0, 0(3)
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+ # 1) store reg1 (SP)
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+ stw 1, 4(3)
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+ # 2) store cr
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+ mfcr 0
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+ stw 0, 8(3)
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+ # 3) store r14-31
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+ stw 14, 12(3)
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+ stw 15, 16(3)
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+ stw 16, 20(3)
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+ stw 17, 24(3)
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+ stw 18, 28(3)
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+ stw 19, 32(3)
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+ stw 20, 36(3)
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+ stw 21, 40(3)
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+ stw 22, 44(3)
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+ stw 23, 48(3)
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+ stw 24, 52(3)
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+ stw 25, 56(3)
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+ stw 26, 60(3)
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+ stw 27, 64(3)
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+ stw 28, 68(3)
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+ stw 29, 72(3)
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+ stw 30, 76(3)
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+ stw 31, 80(3)
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+ # 4) set return value to 0
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+ li 3, 0
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+ # 5) return
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+ blr
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--- /dev/null
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+++ b/src/setjmp/powerpc-sf/setjmp.sub
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@@ -0,0 +1 @@
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+setjmp.s
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