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linux/arch/arm/lib/findbit.S

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treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 Based on 2 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation # extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 4122 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Enrico Weigelt <info@metux.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190604081206.933168790@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-06-04 10:11:33 +02:00
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 15:20:36 -07:00
ARM: findbit: add unwinder information Add unwinder information so oops in the findbit functions can create a proper backtrace. Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
2022-08-11 17:03:29 +01:00
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 15:20:36 -07:00
ARM: findbit: operate by words Convert the implementations to operate on words rather than bytes which makes bitmap searching faster. Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
2022-07-27 00:27:38 +01:00
ARM: findbit: convert to macros Since the pairs of _find_first and _find_next functions are pretty similar, use macros to generate this code. This commit does not change the generated code. Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
2022-08-11 15:53:41 +01:00
ARM: findbit: add unwinder information Add unwinder information so oops in the findbit functions can create a proper backtrace. Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
2022-08-11 17:03:29 +01:00
ARM: findbit: convert to macros Since the pairs of _find_first and _find_next functions are pretty similar, use macros to generate this code. This commit does not change the generated code. Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
2022-08-11 15:53:41 +01:00
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 15:20:36 -07:00
ARM: findbit: operate by words Convert the implementations to operate on words rather than bytes which makes bitmap searching faster. Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
2022-07-27 00:27:38 +01:00
ARM: findbit: convert to macros Since the pairs of _find_first and _find_next functions are pretty similar, use macros to generate this code. This commit does not change the generated code. Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
2022-08-11 15:53:41 +01:00
ARM: findbit: operate by words Convert the implementations to operate on words rather than bytes which makes bitmap searching faster. Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
2022-07-27 00:27:38 +01:00
ARM: findbit: convert to macros Since the pairs of _find_first and _find_next functions are pretty similar, use macros to generate this code. This commit does not change the generated code. Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
2022-08-11 15:53:41 +01:00
ARM: findbit: operate by words Convert the implementations to operate on words rather than bytes which makes bitmap searching faster. Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
2022-07-27 00:27:38 +01:00
ARM: findbit: convert to macros Since the pairs of _find_first and _find_next functions are pretty similar, use macros to generate this code. This commit does not change the generated code. Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
2022-08-11 15:53:41 +01:00
ARM: findbit: operate by words Convert the implementations to operate on words rather than bytes which makes bitmap searching faster. Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
2022-07-27 00:27:38 +01:00
ARM: findbit: convert to macros Since the pairs of _find_first and _find_next functions are pretty similar, use macros to generate this code. This commit does not change the generated code. Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
2022-08-11 15:53:41 +01:00
ARM: findbit: operate by words Convert the implementations to operate on words rather than bytes which makes bitmap searching faster. Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
2022-07-27 00:27:38 +01:00
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 15:20:36 -07:00
ARM: findbit: operate by words Convert the implementations to operate on words rather than bytes which makes bitmap searching faster. Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
2022-07-27 00:27:38 +01:00
ARM: convert all "mov.* pc, reg" to "bx reg" for ARMv6+ ARMv6 and greater introduced a new instruction ("bx") which can be used to return from function calls. Recent CPUs perform better when the "bx lr" instruction is used rather than the "mov pc, lr" instruction, and this sequence is strongly recommended to be used by the ARM architecture manual (section A.4.1.1). We provide a new macro "ret" with all its variants for the condition code which will resolve to the appropriate instruction. Rather than doing this piecemeal, and miss some instances, change all the "mov pc" instances to use the new macro, with the exception of the "movs" instruction and the kprobes code. This allows us to detect the "mov pc, lr" case and fix it up - and also gives us the possibility of deploying this for other registers depending on the CPU selection. Reported-by: Will Deacon <will.deacon@arm.com> Tested-by: Stephen Warren <swarren@nvidia.com> # Tegra Jetson TK1 Tested-by: Robert Jarzmik <robert.jarzmik@free.fr> # mioa701_bootresume.S Tested-by: Andrew Lunn <andrew@lunn.ch> # Kirkwood Tested-by: Shawn Guo <shawn.guo@freescale.com> Tested-by: Tony Lindgren <tony@atomide.com> # OMAPs Tested-by: Gregory CLEMENT <gregory.clement@free-electrons.com> # Armada XP, 375, 385 Acked-by: Sekhar Nori <nsekhar@ti.com> # DaVinci Acked-by: Christoffer Dall <christoffer.dall@linaro.org> # kvm/hyp Acked-by: Haojian Zhuang <haojian.zhuang@gmail.com> # PXA3xx Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> # Xen Tested-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> # ARMv7M Tested-by: Simon Horman <horms+renesas@verge.net.au> # Shmobile Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2014-06-30 16:29:12 +01:00
ARM: findbit: add unwinder information Add unwinder information so oops in the findbit functions can create a proper backtrace. Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
2022-08-11 17:03:29 +01:00
ARM: findbit: convert to macros Since the pairs of _find_first and _find_next functions are pretty similar, use macros to generate this code. This commit does not change the generated code. Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
2022-08-11 15:53:41 +01:00
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 15:20:36 -07:00
ARM: findbit: convert to macros Since the pairs of _find_first and _find_next functions are pretty similar, use macros to generate this code. This commit does not change the generated code. Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
2022-08-11 15:53:41 +01:00
ARM: findbit: add unwinder information Add unwinder information so oops in the findbit functions can create a proper backtrace. Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
2022-08-11 17:03:29 +01:00
ARM: findbit: fix overflowing offset When offset is larger than the size of the bit array, we should not attempt to access the array as we can perform an access beyond the end of the array. Fix this by changing the pre-condition. Using "cmp r2, r1; bhs ..." covers us for the size == 0 case, since this will always take the branch when r1 is zero, irrespective of the value of r2. This means we can fix this bug without adding any additional code! Tested-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
2022-07-26 23:51:48 +01:00
ARM: findbit: operate by words Convert the implementations to operate on words rather than bytes which makes bitmap searching faster. Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
2022-07-27 00:27:38 +01:00
ARM: findbit: convert to macros Since the pairs of _find_first and _find_next functions are pretty similar, use macros to generate this code. This commit does not change the generated code. Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
2022-08-11 15:53:41 +01:00
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 15:20:36 -07:00
[ARM] 3152/1: make various assembly local labels actually local (the rest) Patch from Nicolas Pitre For assembly labels to actually be local they must start with ".L" and not only "." otherwise they still remain visible in the final link and clutter kallsyms needlessly, and possibly make for unclear symbolic backtrace. This patch simply inserts a"L" where appropriate. The code itself is unchanged. Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-11-11 21:51:49 +00:00
ARM: findbit: operate by words Convert the implementations to operate on words rather than bytes which makes bitmap searching faster. Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
2022-07-27 00:27:38 +01:00
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 15:20:36 -07:00
ARM: findbit: add unwinder information Add unwinder information so oops in the findbit functions can create a proper backtrace. Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
2022-08-11 17:03:29 +01:00
ARM: findbit: convert to macros Since the pairs of _find_first and _find_next functions are pretty similar, use macros to generate this code. This commit does not change the generated code. Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
2022-08-11 15:53:41 +01:00
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 15:20:36 -07:00
ARM: findbit: convert to macros Since the pairs of _find_first and _find_next functions are pretty similar, use macros to generate this code. This commit does not change the generated code. Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
2022-08-11 15:53:41 +01:00
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 15:20:36 -07:00
ARM: findbit: convert to macros Since the pairs of _find_first and _find_next functions are pretty similar, use macros to generate this code. This commit does not change the generated code. Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
2022-08-11 15:53:41 +01:00
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 15:20:36 -07:00
ARM: findbit: operate by words Convert the implementations to operate on words rather than bytes which makes bitmap searching faster. Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
2022-07-27 00:27:38 +01:00
ARM: findbit: add unwinder information Add unwinder information so oops in the findbit functions can create a proper backtrace. Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
2022-08-11 17:03:29 +01:00
ARM: findbit: operate by words Convert the implementations to operate on words rather than bytes which makes bitmap searching faster. Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
2022-07-27 00:27:38 +01:00
[ARM] 3152/1: make various assembly local labels actually local (the rest) Patch from Nicolas Pitre For assembly labels to actually be local they must start with ".L" and not only "." otherwise they still remain visible in the final link and clutter kallsyms needlessly, and possibly make for unclear symbolic backtrace. This patch simply inserts a"L" where appropriate. The code itself is unchanged. Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-11-11 21:51:49 +00:00
ARM: findbit: provide more efficient ARMv7 implementation Provide a more efficient ARMv7 implementation to determine the first set bit in the supplied value. Signed-off-by: Russell King (Oracle) <rmk@armlinux.org.uk>
2022-07-29 16:10:49 +01:00
ARM: 6482/2: Fix find_next_zero_bit and related assembly The find_next_bit, find_first_bit, find_next_zero_bit and find_first_zero_bit functions were not properly clamping to the maxbit argument at the bit level. They were instead only checking maxbit at the byte level. To fix this, add a compare and a conditional move instruction to the end of the common bit-within-the- byte code used by all the functions and be sure not to clobber the maxbit argument before it is used. Cc: <stable@kernel.org> Reviewed-by: Nicolas Pitre <nicolas.pitre@linaro.org> Tested-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: James Jones <jajones@nvidia.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2010-11-24 00:21:37 +01:00
ARM: findbit: document ARMv5 bit offset calculation Document the ARMv5 bit offset calculation code. Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
2022-07-29 16:12:25 +01:00
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 15:20:36 -07:00
ARM: findbit: operate by words Convert the implementations to operate on words rather than bytes which makes bitmap searching faster. Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
2022-07-27 00:27:38 +01:00
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 15:20:36 -07:00
ARM: findbit: operate by words Convert the implementations to operate on words rather than bytes which makes bitmap searching faster. Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
2022-07-27 00:27:38 +01:00
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 15:20:36 -07:00
ARM: findbit: operate by words Convert the implementations to operate on words rather than bytes which makes bitmap searching faster. Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
2022-07-27 00:27:38 +01:00
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 15:20:36 -07:00
ARM: 6482/2: Fix find_next_zero_bit and related assembly The find_next_bit, find_first_bit, find_next_zero_bit and find_first_zero_bit functions were not properly clamping to the maxbit argument at the bit level. They were instead only checking maxbit at the byte level. To fix this, add a compare and a conditional move instruction to the end of the common bit-within-the- byte code used by all the functions and be sure not to clobber the maxbit argument before it is used. Cc: <stable@kernel.org> Reviewed-by: Nicolas Pitre <nicolas.pitre@linaro.org> Tested-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: James Jones <jajones@nvidia.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2010-11-24 00:21:37 +01:00
ARM: convert all "mov.* pc, reg" to "bx reg" for ARMv6+ ARMv6 and greater introduced a new instruction ("bx") which can be used to return from function calls. Recent CPUs perform better when the "bx lr" instruction is used rather than the "mov pc, lr" instruction, and this sequence is strongly recommended to be used by the ARM architecture manual (section A.4.1.1). We provide a new macro "ret" with all its variants for the condition code which will resolve to the appropriate instruction. Rather than doing this piecemeal, and miss some instances, change all the "mov pc" instances to use the new macro, with the exception of the "movs" instruction and the kprobes code. This allows us to detect the "mov pc, lr" case and fix it up - and also gives us the possibility of deploying this for other registers depending on the CPU selection. Reported-by: Will Deacon <will.deacon@arm.com> Tested-by: Stephen Warren <swarren@nvidia.com> # Tegra Jetson TK1 Tested-by: Robert Jarzmik <robert.jarzmik@free.fr> # mioa701_bootresume.S Tested-by: Andrew Lunn <andrew@lunn.ch> # Kirkwood Tested-by: Shawn Guo <shawn.guo@freescale.com> Tested-by: Tony Lindgren <tony@atomide.com> # OMAPs Tested-by: Gregory CLEMENT <gregory.clement@free-electrons.com> # Armada XP, 375, 385 Acked-by: Sekhar Nori <nsekhar@ti.com> # DaVinci Acked-by: Christoffer Dall <christoffer.dall@linaro.org> # kvm/hyp Acked-by: Haojian Zhuang <haojian.zhuang@gmail.com> # PXA3xx Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> # Xen Tested-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> # ARMv7M Tested-by: Simon Horman <horms+renesas@verge.net.au> # Shmobile Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2014-06-30 16:29:12 +01:00
ARM: findbit: add unwinder information Add unwinder information so oops in the findbit functions can create a proper backtrace. Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
2022-08-11 17:03:29 +01:00