Alexandre Oliva writes:

This patch adds code to uClibc to support a new ABI designed for the
FR-V architecture, that enables text segments of executables and
shared libraries to be shared by multiple processes on an OS such as
uClinux, that can run on FR-V processors without an MMU.

Patches for binutils and GCC have just been posted in the
corresponding mailing lists.  The binutils patch was approved,
but there's one additional patch pending review, that I posted
this week.  An updated GCC patch will be posted to
gcc-patches@gcc.gnu.org as soon as I complete testing (I used a
known-good compiler to test the uClibc patch below).

Since the existing dynamic loader code didn't support independent
relocation of segments, it required changes that were somewhat
extensive.  I've added a number of new machine-specific macros to try
to keep the platform and ABI-specific details outside the generic
code.  I hope this is not a problem.

1 files changed, 451 insertions, 0 deletions

diff --git a/libc/sysdeps/linux/frv/sys/ucontext.h b/libc/sysdeps/linux/frv/sys/ucontext.h
new file mode 100644
index 000000000..2385a072e
--- /dev/null
+++ b/libc/sysdeps/linux/frv/sys/ucontext.h
@@ -0,0 +1,451 @@
+/* Copyright (C) 1999, 2000, 2001, 2003 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 of the
+   License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#ifndef _SYS_UCONTEXT_H
+#define _SYS_UCONTEXT_H	1
+
+#include <features.h>
+#include <signal.h>
+
+/* We need the signal context definitions even if they are not used
+   included in <signal.h>.  */
+#include <bits/sigcontext.h>
+
+
+typedef unsigned long greg_t;
+
+/* Number of general registers.  */
+#define NGREG	(10+2+64)
+
+/* Container for all general registers.  */
+typedef greg_t gregset_t[NGREG];
+
+#ifdef __USE_GNU
+/* Number of each register is the `gregset_t' array.  */
+enum
+{
+  PSR = 0,
+#define PSR	PSR
+  ISR = 1,
+#define ISR	ISR
+  CCR = 2,
+#define CCR	CCR
+  CCCR = 3,
+#define CCCR	CCCR
+  LR = 4,
+#define LR	LR
+  LCR = 5,
+#define LCR	LCR
+  PC = 6,
+#define PC	PC
+  __STATUS = 7,
+#define __STATUS	__STATUS
+  SYSCALLNO = 8,
+#define SYSCALLNO	SYSCALLNO
+  ORIG_GR8 = 9,
+#define ORIG_GR8	ORIG_GR8
+  GNER0 = 10,
+#define GNER0	GNER0
+  GNER1 = 11,
+#define GNER1	GNER1
+  GR0 = 12,
+#define GR0	GR0
+  GR1 = 13,
+#define GR1	GR1
+  GR2 = 14,
+#define GR2	GR2
+  GR3 = 15,
+#define GR3	GR3
+  GR4 = 16,
+#define GR4	GR4
+  GR5 = 17,
+#define GR5	GR5
+  GR6 = 18,
+#define GR6	GR6
+  GR7 = 19,
+#define GR7	GR7
+  GR8 = 20,
+#define GR8	GR8
+  GR9 = 21,
+#define GR9	GR9
+  GR10 = 22,
+#define GR10	GR10
+  GR11 = 23,
+#define GR11	GR11
+  GR12 = 24,
+#define GR12	GR12
+  GR13 = 25,
+#define GR13	GR13
+  GR14 = 26,
+#define GR14	GR14
+  GR15 = 27,
+#define GR15	GR15
+  GR16 = 28,
+#define GR16	GR16
+  GR17 = 29,
+#define GR17	GR17
+  GR18 = 30,
+#define GR18	GR18
+  GR19 = 31,
+#define GR19	GR19
+  GR20 = 32,
+#define GR20	GR20
+  GR21 = 33,
+#define GR21	GR21
+  GR22 = 34,
+#define GR22	GR22
+  GR23 = 35,
+#define GR23	GR23
+  GR24 = 36,
+#define GR24	GR24
+  GR25 = 37,
+#define GR25	GR25
+  GR26 = 38,
+#define GR26	GR26
+  GR27 = 39,
+#define GR27	GR27
+  GR28 = 40,
+#define GR28	GR28
+  GR29 = 41,
+#define GR29	GR29
+  GR30 = 42,
+#define GR30	GR30
+  GR31 = 43,
+#define GR31	GR31
+  GR32 = 44,
+#define GR32	GR32
+  GR33 = 45,
+#define GR33	GR33
+  GR34 = 46,
+#define GR34	GR34
+  GR35 = 47,
+#define GR35	GR35
+  GR36 = 48,
+#define GR36	GR36
+  GR37 = 49,
+#define GR37	GR37
+  GR38 = 50,
+#define GR38	GR38
+  GR39 = 51,
+#define GR39	GR39
+  GR40 = 52,
+#define GR40	GR40
+  GR41 = 53,
+#define GR41	GR41
+  GR42 = 54,
+#define GR42	GR42
+  GR43 = 55,
+#define GR43	GR43
+  GR44 = 56,
+#define GR44	GR44
+  GR45 = 57,
+#define GR45	GR45
+  GR46 = 58,
+#define GR46	GR46
+  GR47 = 59,
+#define GR47	GR47
+  GR48 = 60,
+#define GR48	GR48
+  GR49 = 61,
+#define GR49	GR49
+  GR50 = 62,
+#define GR50	GR50
+  GR51 = 63,
+#define GR51	GR51
+  GR52 = 64,
+#define GR52	GR52
+  GR53 = 65,
+#define GR53	GR53
+  GR54 = 66,
+#define GR54	GR54
+  GR55 = 67,
+#define GR55	GR55
+  GR56 = 68,
+#define GR56	GR56
+  GR57 = 69,
+#define GR57	GR57
+  GR58 = 70,
+#define GR58	GR58
+  GR59 = 71,
+#define GR59	GR59
+  GR60 = 72,
+#define GR60	GR60
+  GR61 = 73,
+#define GR61	GR61
+  GR62 = 74,
+#define GR62	GR62
+  GR63 = 75,
+#define GR63	GR63
+};
+#endif
+
+typedef unsigned long freg_t;
+
+/* Number of FPU registers.  */
+#define NFPREG	(64+2+2+8+2+1)
+
+#ifdef __USE_GNU
+/* Number of each register is the `gregset_t' array.  */
+enum
+{
+  FR0 = 0,
+#define FR0	FR0
+  FR1 = 1,
+#define FR1	FR1
+  FR2 = 2,
+#define FR2	FR2
+  FR3 = 3,
+#define FR3	FR3
+  FR4 = 4,
+#define FR4	FR4
+  FR5 = 5,
+#define FR5	FR5
+  FR6 = 6,
+#define FR6	FR6
+  FR7 = 7,
+#define FR7	FR7
+  FR8 = 8,
+#define FR8	FR8
+  FR9 = 9,
+#define FR9	FR9
+  FR10 = 10,
+#define FR10	FR10
+  FR11 = 11,
+#define FR11	FR11
+  FR12 = 12,
+#define FR12	FR12
+  FR13 = 13,
+#define FR13	FR13
+  FR14 = 14,
+#define FR14	FR14
+  FR15 = 15,
+#define FR15	FR15
+  FR16 = 16,
+#define FR16	FR16
+  FR17 = 17,
+#define FR17	FR17
+  FR18 = 18,
+#define FR18	FR18
+  FR19 = 19,
+#define FR19	FR19
+  FR20 = 20,
+#define FR20	FR20
+  FR21 = 21,
+#define FR21	FR21
+  FR22 = 22,
+#define FR22	FR22
+  FR23 = 23,
+#define FR23	FR23
+  FR24 = 24,
+#define FR24	FR24
+  FR25 = 25,
+#define FR25	FR25
+  FR26 = 26,
+#define FR26	FR26
+  FR27 = 27,
+#define FR27	FR27
+  FR28 = 28,
+#define FR28	FR28
+  FR29 = 29,
+#define FR29	FR29
+  FR30 = 30,
+#define FR30	FR30
+  FR31 = 31,
+#define FR31	FR31
+  FR32 = 32,
+#define FR32	FR32
+  FR33 = 33,
+#define FR33	FR33
+  FR34 = 34,
+#define FR34	FR34
+  FR35 = 35,
+#define FR35	FR35
+  FR36 = 36,
+#define FR36	FR36
+  FR37 = 37,
+#define FR37	FR37
+  FR38 = 38,
+#define FR38	FR38
+  FR39 = 39,
+#define FR39	FR39
+  FR40 = 40,
+#define FR40	FR40
+  FR41 = 41,
+#define FR41	FR41
+  FR42 = 42,
+#define FR42	FR42
+  FR43 = 43,
+#define FR43	FR43
+  FR44 = 44,
+#define FR44	FR44
+  FR45 = 45,
+#define FR45	FR45
+  FR46 = 46,
+#define FR46	FR46
+  FR47 = 47,
+#define FR47	FR47
+  FR48 = 48,
+#define FR48	FR48
+  FR49 = 49,
+#define FR49	FR49
+  FR50 = 50,
+#define FR50	FR50
+  FR51 = 51,
+#define FR51	FR51
+  FR52 = 52,
+#define FR52	FR52
+  FR53 = 53,
+#define FR53	FR53
+  FR54 = 54,
+#define FR54	FR54
+  FR55 = 55,
+#define FR55	FR55
+  FR56 = 56,
+#define FR56	FR56
+  FR57 = 57,
+#define FR57	FR57
+  FR58 = 58,
+#define FR58	FR58
+  FR59 = 59,
+#define FR59	FR59
+  FR60 = 60,
+#define FR60	FR60
+  FR61 = 61,
+#define FR61	FR61
+  FR62 = 62,
+#define FR62	FR62
+  FR63 = 63,
+#define FR63	FR63
+  FNER0 = 64,
+#define FNER0	FNER0
+  FNER1 = 65,
+#define FNER1	FNER1
+  MSR0 = 66,
+#define MSR0	MSR0
+  MSR1 = 67,
+#define MSR1	MSR1
+  ACC0 = 68,
+#define ACC0	ACC0
+  ACC1 = 69,
+#define ACC1	ACC1
+  ACC2 = 70,
+#define ACC2	ACC2
+  ACC3 = 71,
+#define ACC3	ACC3
+  ACC4 = 72,
+#define ACC4	ACC4
+  ACC5 = 73,
+#define ACC5	ACC5
+  ACC6 = 74,
+#define ACC6	ACC6
+  ACC7 = 75,
+#define ACC7	ACC7
+  ACCG0123 = 76,
+#define ACCG0123	ACCG0123
+  ACCG4567 = 77,
+#define ACCG4567	ACCG4567
+  FSR0 = 78,
+#define FSR0	FSR0
+};
+#endif
+
+/* Structure to describe FPU registers.  */
+typedef freg_t fpregset_t[NFPREG];
+
+/* Context to describe whole processor state.  */
+typedef struct
+  {
+    gregset_t gregs;
+    fpregset_t fpregs;
+    void *extension;
+    unsigned long sc_oldmask; 	/* old sigmask */
+  } __attribute__((aligned(8))) mcontext_t;
+
+#ifdef __USE_GNU
+struct kernel_user_int_regs
+{
+  /* integer registers
+   * - up to gr[31] mirror pt_regs in the kernel
+   */
+  unsigned long		psr;		/* Processor Status Register */
+  unsigned long		isr;		/* Integer Status Register */
+  unsigned long		ccr;		/* Condition Code Register */
+  unsigned long		cccr;		/* Condition Code for Conditional Insns Register */
+  unsigned long		lr;		/* Link Register */
+  unsigned long		lcr;		/* Loop Count Register */
+  unsigned long		pc;		/* Program Counter Register */
+  unsigned long		__status;	/* exception status */
+  unsigned long		syscallno;	/* syscall number or -1 */
+  unsigned long		orig_gr8;	/* original syscall arg #1 */
+  unsigned long		gner[2];
+
+  union {
+    unsigned long	tbr;
+    unsigned long	gr[64];
+  };
+};
+
+struct kernel_user_fpmedia_regs
+{
+  /* FP/Media registers */
+  unsigned long	fr[64];
+  unsigned long	fner[2];
+  unsigned long	msr[2];
+  unsigned long	acc[8];
+  unsigned char	accg[8];
+  unsigned long	fsr[1];
+};
+
+struct kernel_user_context
+{
+  struct kernel_user_int_regs i;
+  struct kernel_user_fpmedia_regs f;
+
+  /* we provide a context extension so that we can save the regs for CPUs that
+   * implement many more of Fujitsu's lavish register spec
+   */
+  void			*extension;
+
+  /* This is not part of the kernel's struct user_context, but
+     rather of the enclosing struct sigcontext, but we add it
+     here to parallel mcontext_t, just for completeness.  */
+  unsigned long sc_oldmask; 	/* old sigmask */
+} __attribute__((aligned(8)));
+
+/* This union enables alias-safe casts from mcontext_t* to the union
+   type, that can then be dereferenced as_aliases.  */
+union kmcontext_t
+{
+  mcontext_t as_regsets;
+  /* as_aliases is actually missing sc_oldmask, that is present in
+     mcontext_t.  */
+  struct kernel_user_context as_aliases;
+};
+#endif
+
+/* Userlevel context.  */
+typedef struct ucontext
+  {
+    unsigned long int uc_flags;
+    struct ucontext *uc_link;
+    stack_t uc_stack;
+    mcontext_t uc_mcontext;
+    __sigset_t uc_sigmask;
+  } ucontext_t;
+
+#endif /* sys/ucontext.h */