From mboxrd@z Thu Jan 1 00:00:00 1970 From: Keith Owens Date: Thu, 01 Aug 2002 03:17:25 +0000 Subject: [Linux-ia64] [patch] Assign __gp to middle of short data sections Message-Id: List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-ia64@vger.kernel.org I was getting '__gp does not cover short data segment'. arch/ia64/vmlinus.lds.S assigns __gp well away from the short data sections, for no good reason that I can see. A kernel with more than 2^21 bytes between __gp and the end of sbss cannot link. This patch (against 2.4.18) puts __gp right in the middle of the short data sections. The comment 'gp must be 16-byte aligned for exc. table' puzzles me, AFAICT the exception tables are not accessed via gp. Index: 19-pre10.10/arch/ia64/vmlinux.lds.S --- 19-pre10.10/arch/ia64/vmlinux.lds.S Thu, 09 May 2002 12:00:25 +1000 kaos (linux-2.4/p/c/50_vmlinux.ld 1.1.5.1.2.1.1.1.1.2 644) +++ 19-pre10.10(w)/arch/ia64/vmlinux.lds.S Thu, 01 Aug 2002 13:09:02 +1000 kaos (linux-2.4/p/c/50_vmlinux.ld 1.1.5.1.2.1.1.1.1.2 644) @@ -40,8 +40,6 @@ SECTIONS /* Read-only data */ - __gp = ALIGN(16) + 0x200000; /* gp must be 16-byte aligned for exc. table */ - /* Global data */ _data = .; @@ -130,6 +128,7 @@ SECTIONS .data : AT(ADDR(.data) - PAGE_OFFSET) { *(.data) *(.gnu.linkonce.d*) CONSTRUCTORS } + __got = ALIGN(16); .got : AT(ADDR(.got) - PAGE_OFFSET) { *(.got.plt) *(.got) } /* We want the small data sections together, so single-instruction offsets @@ -141,6 +140,7 @@ SECTIONS _bss = .; .sbss : AT(ADDR(.sbss) - PAGE_OFFSET) { *(.sbss) *(.scommon) } + __gp = (. - (. - __got) / 2) & -16; /* put __gp in the middle of the short data areas */ .bss : AT(ADDR(.bss) - PAGE_OFFSET) { *(.bss) *(COMMON) } . = ALIGN(64 / 8);