diff options
Diffstat (limited to 'meta-rcar-gen3/recipes-bsp/optee/optee-os')
| -rw-r--r-- | meta-rcar-gen3/recipes-bsp/optee/optee-os/0001-core-define-syscall_t-as-void-void.patch | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/meta-rcar-gen3/recipes-bsp/optee/optee-os/0001-core-define-syscall_t-as-void-void.patch b/meta-rcar-gen3/recipes-bsp/optee/optee-os/0001-core-define-syscall_t-as-void-void.patch new file mode 100644 index 0000000..bad7b27 --- /dev/null +++ b/meta-rcar-gen3/recipes-bsp/optee/optee-os/0001-core-define-syscall_t-as-void-void.patch @@ -0,0 +1,75 @@ +From f6d17e33e7b95c90a2521cfd37cd5cb511909fc4 Mon Sep 17 00:00:00 2001 +From: Jerome Forissier <jerome.forissier@linaro.org> +Date: Thu, 5 Jul 2018 13:07:52 +0200 +Subject: [PATCH] core: define syscall_t as void (*)(void) +MIME-Version: 1.0 +Content-Type: text/plain; charset=UTF-8 +Content-Transfer-Encoding: 8bit + +syscall_t is currently typedef'ed as TEE_Result (*)(void). It is used to +represent a pointer to any system call, in the syscall table for instance. +As such, the exact type behind syscall_t cannot reflect all the syscalls +since they have different prototypes. The current declaration with a +TEE_Result return type was probably chosen because it was a common +characteristic of all syscalls to return a TEE_Result. + +However, this type causes compilation warnings with GCC 8.1: + +core/arch/arm/tee/arch_svc.c:43:36: warning: cast between incompatible function types from ‘void (*)(long unsigned int)’ to ‘TEE_Result (*)(void)’ {aka ‘unsigned int (*)(void)’} [-Wcast-function-type] + #define SYSCALL_ENTRY(_fn) { .fn = (syscall_t)_fn } + ^ +core/arch/arm/tee/arch_svc.c:50:2: note: in expansion of macro ‘SYSCALL_ENTRY’ + SYSCALL_ENTRY(syscall_sys_return), + ^~~~~~~~~~~~~ + +The solution is to use 'void (*)(void)' instead, as explained in the GCC +documentation: + + -Wcast-function-type + + Warn when a function pointer is cast to an incompatible function + pointer. [...] The function type void (*) (void) is special and matches + everything, which can be used to suppress this warning. [...] + +Link: [1] https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html +Signed-off-by: Jerome Forissier <jerome.forissier@linaro.org> +Acked-by: Jens Wiklander <jens.wiklander@linaro.org> +--- + core/arch/arm/tee/arch_svc.c | 2 +- + core/arch/arm/tee/arch_svc_private.h | 7 +++++-- + 2 files changed, 6 insertions(+), 3 deletions(-) + +diff --git a/core/arch/arm/tee/arch_svc.c b/core/arch/arm/tee/arch_svc.c +index eb142ec..b2dd193 100644 +--- a/core/arch/arm/tee/arch_svc.c ++++ b/core/arch/arm/tee/arch_svc.c +@@ -208,7 +208,7 @@ void __weak tee_svc_handler(struct thread_svc_regs *regs) + } + + if (scn > TEE_SCN_MAX) +- scf = syscall_not_supported; ++ scf = (syscall_t)syscall_not_supported; + else + scf = tee_svc_syscall_table[scn].fn; + +diff --git a/core/arch/arm/tee/arch_svc_private.h b/core/arch/arm/tee/arch_svc_private.h +index c0b3a73..695e733 100644 +--- a/core/arch/arm/tee/arch_svc_private.h ++++ b/core/arch/arm/tee/arch_svc_private.h +@@ -7,8 +7,11 @@ + + #include <tee_api_types.h> + +-/* void argument but in reality it can be any number of arguments */ +-typedef TEE_Result (*syscall_t)(void); ++/* ++ * Generic "pointer to function" type. Actual syscalls take zero or more ++ * arguments and return TEE_Result. ++ */ ++typedef void (*syscall_t)(void); + + /* Helper function for tee_svc_handler() */ + uint32_t tee_svc_do_call(struct thread_svc_regs *regs, syscall_t func); +-- +2.7.4 + |