[klibc] [klibc:master] add-mips64-support-arch-mips64-specific

[klibc-bot for Dejan Latinovic]

Commit-ID:  3438d861da2e6939a6b0d454ffe247c19ead5993
Gitweb:     http://git.kernel.org/?p=libs/klibc/klibc.git;a=commit;h=3438d861da2e6939a6b0d454ffe247c19ead5993
Author:     Dejan Latinovic <Dejan.Latinovic at imgtec.com>
AuthorDate: Thu, 5 Mar 2015 16:51:45 -0800
Committer:  H. Peter Anvin <hpa at linux.intel.com>
CommitDate: Thu, 5 Mar 2015 16:51:45 -0800

add-mips64-support-arch-mips64-specific

Description: Adding mips64 specific chagnes.
Modeled on mips 32 and adapted for 64 bit ABI.
 - MCONFIG:  using existing klibc.ld scrpit
 - crt0.S:   adapted gp initialization
 - setjmp.S: do not save floating-point state

---
 usr/klibc/arch/mips64/MCONFIG  |  2 ++
 usr/klibc/arch/mips64/crt0.S   | 31 ++++++++++++++++++++++++++
 usr/klibc/arch/mips64/setjmp.S | 50 ++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 83 insertions(+)

diff --git a/usr/klibc/arch/mips64/MCONFIG b/usr/klibc/arch/mips64/MCONFIG
index 5c50b8d..b37cc6a 100644
--- a/usr/klibc/arch/mips64/MCONFIG
+++ b/usr/klibc/arch/mips64/MCONFIG
@@ -9,3 +9,5 @@
 
 KLIBCOPTFLAGS += -Os
 KLIBCBITSIZE  = 64
+
+KLIBCSHAREDFLAGS  = -T $(src)/arch/mips/klibc.ld
diff --git a/usr/klibc/arch/mips64/crt0.S b/usr/klibc/arch/mips64/crt0.S
new file mode 100644
index 0000000..775a919
--- /dev/null
+++ b/usr/klibc/arch/mips64/crt0.S
@@ -0,0 +1,31 @@
+#
+# arch/mips64/crt0.S
+#
+# Does arch-specific initialization and invokes __libc_init
+# with the appropriate arguments.
+#
+# See __static_init.c or __shared_init.c for the expected
+# arguments.
+#
+
+#include <machine/asm.h>
+
+NESTED(__start, 64, sp)
+	daddiu  sp,sp,-64
+	sd	zero, 32(sp)
+
+					# Initialize gp
+	lui gp,%highest(_gp) 		# load highest "halfword"
+	daddiu gp,gp,%higher(_gp) 	# merge next "halfword"
+	dsll gp,gp,16 			# shift by one halfword
+	daddiu gp,gp,%hi(_gp) 		# merge next "halfword"
+	dsll gp,gp,16 			# shift into final position
+	daddiu gp,gp,%lo(_gp) 		# merge lowest "halfword"
+
+	daddiu	a0, sp, 64		# Pointer to ELF entry structure
+	move	a1, v0			# Kernel-provided atexit() pointer
+
+	ld  t9, %call16(__libc_init)(gp)
+	jalr t9
+
+	END(__start)
diff --git a/usr/klibc/arch/mips64/setjmp.S b/usr/klibc/arch/mips64/setjmp.S
new file mode 100644
index 0000000..5d902e2
--- /dev/null
+++ b/usr/klibc/arch/mips64/setjmp.S
@@ -0,0 +1,50 @@
+#
+# arch/mips64/setjmp.S
+#
+# setjmp/longjmp for the MIPS architecture
+#
+# The jmp_buf is assumed to contain the following, in order:
+#	s0..s7
+#	gp
+#	sp
+#	s8
+#	ra
+#
+
+#include <machine/asm.h>
+
+LEAF(setjmp)
+	sd	s0,  0(a0)
+	sd	s1,  8(a0)
+	sd	s2, 16(a0)
+	sd	s3, 24(a0)
+	sd	s4, 32(a0)
+	sd	s5, 40(a0)
+	sd	s6, 48(a0)
+	sd	s7, 56(a0)
+	sd	gp, 64(a0)
+	sd	sp, 72(a0)
+	sd	s8, 80(a0)
+	sd	ra, 88(a0)
+	move	v0, zero
+	jr	ra
+
+	END(setjmp)
+
+LEAF(longjmp)
+	ld	s0,  0(a0)
+	ld	s1,  8(a0)
+	ld	s2, 16(a0)
+	ld	s3, 24(a0)
+	ld	s4, 32(a0)
+	ld	s5, 40(a0)
+	ld	s6, 48(a0)
+	ld	s7, 56(a0)
+	ld	gp, 64(a0)
+	ld	sp, 72(a0)
+	ld	s8, 80(a0)
+	ld	ra, 88(a0)
+	move	v0, a1
+	jr	ra
+
+	END(longjmp)