diff options
Diffstat (limited to 'target/linux/uml/patches-4.9/001-um-Allow-building-and-running-on-older-hosts.patch')
| -rw-r--r-- | target/linux/uml/patches-4.9/001-um-Allow-building-and-running-on-older-hosts.patch | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/target/linux/uml/patches-4.9/001-um-Allow-building-and-running-on-older-hosts.patch b/target/linux/uml/patches-4.9/001-um-Allow-building-and-running-on-older-hosts.patch new file mode 100644 index 0000000000..9de557bfd5 --- /dev/null +++ b/target/linux/uml/patches-4.9/001-um-Allow-building-and-running-on-older-hosts.patch @@ -0,0 +1,99 @@ +From 0a987645672ebde7844a9c0732a5a25f3d4bb6c6 Mon Sep 17 00:00:00 2001 +From: Florian Fainelli <f.fainelli@gmail.com> +Date: Thu, 25 May 2017 11:36:26 -0700 +Subject: [PATCH] um: Allow building and running on older hosts + +[ Upstream commit 0a987645672ebde7844a9c0732a5a25f3d4bb6c6 ] + +Commit a78ff1112263 ("um: add extended processor state save/restore +support") and b6024b21fec8 ("um: extend fpstate to _xstate to support +YMM registers") forced the use of the x86 FP _xstate and +PTRACE_GETREGSET/SETREGSET. On older hosts, we would neither be able to +build UML nor run it anymore with these two commits applied because we +don't have definitions for struct _xstate nor these two ptrace requests. + +We can determine at build time which fp context structure to check +against, just like we can keep using the old i387 fp save/restore if +PTRACE_GETRESET/SETREGSET are not defined. + +Fixes: a78ff1112263 ("um: add extended processor state save/restore support") +Fixes: b6024b21fec8 ("um: extend fpstate to _xstate to support YMM registers") +Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> +Signed-off-by: Richard Weinberger <richard@nod.at> +--- + arch/x86/um/os-Linux/registers.c | 12 ++++++++---- + arch/x86/um/user-offsets.c | 4 ++++ + 2 files changed, 12 insertions(+), 4 deletions(-) + +--- a/arch/x86/um/os-Linux/registers.c ++++ b/arch/x86/um/os-Linux/registers.c +@@ -26,6 +26,7 @@ int save_i387_registers(int pid, unsigne + + int save_fp_registers(int pid, unsigned long *fp_regs) + { ++#ifdef PTRACE_GETREGSET + struct iovec iov; + + if (have_xstate_support) { +@@ -34,9 +35,9 @@ int save_fp_registers(int pid, unsigned + if (ptrace(PTRACE_GETREGSET, pid, NT_X86_XSTATE, &iov) < 0) + return -errno; + return 0; +- } else { ++ } else ++#endif + return save_i387_registers(pid, fp_regs); +- } + } + + int restore_i387_registers(int pid, unsigned long *fp_regs) +@@ -48,6 +49,7 @@ int restore_i387_registers(int pid, unsi + + int restore_fp_registers(int pid, unsigned long *fp_regs) + { ++#ifdef PTRACE_SETREGSET + struct iovec iov; + + if (have_xstate_support) { +@@ -56,9 +58,9 @@ int restore_fp_registers(int pid, unsign + if (ptrace(PTRACE_SETREGSET, pid, NT_X86_XSTATE, &iov) < 0) + return -errno; + return 0; +- } else { ++ } else ++#endif + return restore_i387_registers(pid, fp_regs); +- } + } + + #ifdef __i386__ +@@ -122,6 +124,7 @@ int put_fp_registers(int pid, unsigned l + + void arch_init_registers(int pid) + { ++#ifdef PTRACE_GETREGSET + struct _xstate fp_regs; + struct iovec iov; + +@@ -129,6 +132,7 @@ void arch_init_registers(int pid) + iov.iov_len = sizeof(struct _xstate); + if (ptrace(PTRACE_GETREGSET, pid, NT_X86_XSTATE, &iov) == 0) + have_xstate_support = 1; ++#endif + } + #endif + +--- a/arch/x86/um/user-offsets.c ++++ b/arch/x86/um/user-offsets.c +@@ -50,7 +50,11 @@ void foo(void) + DEFINE(HOST_GS, GS); + DEFINE(HOST_ORIG_AX, ORIG_EAX); + #else ++#if defined(PTRACE_GETREGSET) && defined(PTRACE_SETREGSET) + DEFINE(HOST_FP_SIZE, sizeof(struct _xstate) / sizeof(unsigned long)); ++#else ++ DEFINE(HOST_FP_SIZE, sizeof(struct _fpstate) / sizeof(unsigned long)); ++#endif + DEFINE_LONGS(HOST_BX, RBX); + DEFINE_LONGS(HOST_CX, RCX); + DEFINE_LONGS(HOST_DI, RDI); |